The two letter coder after the date reads as follows:

HB	Heya Branched-out	HC	Heya Changed	HM	Heya Merged	HR	Heya Renamed	HS	Heya Shut-down
KA	Kabu Assumed	KB	Kabu Bought	KC	Kabu Changed	KS	Kabu Switched
PA	Pass-Away	RM	Retirement (Mandatory)	RO	Retirement (Other)			OS	Other Stuff

2013 May 08	KB	Kotoshogiku buys Hidenoyama-kabu (that is rent to former Kotonishiki) from Hidenoyama[11] (former Hasegawa).
2013 May 07	KC	Nishiiwa (former Tamanoshima) changes to Hanaregoma. After loaning his first kabu he is the owner of the Hanaregoma name now.
2013 Apr 25	KB	Katsunoura (former Kirinishiki), who loaned this kabu, becomes regular owner of the kabu.
2013 Apr 09	KC	Tagonoura (former Kinkaiyama) changes to Iwatomo (on loan).
2013 Apr 01	HB	Musashigawa (former Musashimaru) branches out from Fujishima-beya and opens up his own.
2013 Mar 25	HS	Magaki-beya shuts down. Magaki (former Wakanohana), all other personnel and all rikishi will be attached to Isegahama-beya from now on.
2013 Mar 24	KA	Miyabiyama retires and becomes Futagoyama-oyakata.
2013 Feb 20	KC	Futagoyama (former Kobo) changes to Tatsutagawa (on loan).
2013 Feb 16	RM	Hanaregoma (former Kaiketsu) turns 65 and retires.
2013 Feb 09	RM	Nakamura (former Fujizakura) turns 65 and retires.
2013 Feb 07	HS	Hanaregoma-beya shuts down. Hanaregoma (former Kaiketsu), all other personnel and all rikishi will be attached to Shibatayama-beya from now on.
2013 Feb 04	KC	Oshima (former Musashimaru) changes to Musashigawa.
2013 Feb 04	RM	Musashigawa (former Mienoumi) turns 65 and retires. Although he is retiring from the Kyokai he will stay director of the Sumo Museum.
2013 Jan 31	OS	After the retirement of riji Ikazuchi[16] (former Kasugafuji) in September Isegahama-ichimon holds a by-election for the vacant riji post. Since Isegahama (former Asahifuji) is the only candidate, he is nominated riji without an election being necessary.
2013 Jan 28	HS	Nishonoseki-beya shuts down. Nishonoseki (former Kongo), Kitajin (former Kirinji), Minatogawa (former Daitetsu) and all other personnel will be attached to Matsugane-beya from now on. Fujigane (former Daizen) moves across ichimon borders to Kasugano-beya. The three remaining rikishi of the heya retire. The oyakata of the ichimon decide that -- to honour the recently passed away Taiho -- the ichimon will still be called Nishonoseki-ichimon despite having no heya with that name any more. Later in the year someone should pick up the name and revive the heya.
2013 Jan 27	KA	Bushuyama retires and becomes Onogawa-oyakata (on loan).
2013 Jan 27	KA	Takamisakari retires and becomes Furiwake-oyakata.
2013 Jan 19	PA	Retired oyakata Taiho (Ichidai Toshiyori) passes away of a heart attack at the age of 72.
2013 Jan 08	KC	Ajigawa (former Shikishima) changes to Urakaze. After seven loaned kabu (including his Jun Toshiyori term) he is the owner of the Urakaze name now.
2013 Jan 04	KC	Onogawa (former Kitazakura) changes to Shikihide and continues the heya, which former head (former Oshio) has become 65 years old today. Oshio and Kitazakura's father are close friends and were together in Tokitsukaze-ichimon (and so was Kitazakura's brother). Kitazakura is the only member of the family being part of Dewanoumi-ichimon and moves the heya over ichimon borders, it belongs to Dewanoumi-ichimon now.
2013 Jan 04	RM	Shikihide (former Oshio) turns 65 and retires.
2012 Dec 19	OS	After the scandal surrounding retired Ikazuchi[16] (former Kasugafuji), who has been a long-time holder of the Kasugayama-kabu, the former Kasugayama-Isegahama-kumiai drops one name and renames into Isegahama-ichimon.
2012 Dec 19	HS	Nakamura-beya shuts down. Nakamura (former Fujizakura), almost all other personnel and all rikishi will be attached to Azumazeki-beya from now on. One gyoji moves to Hakkaku-beya.
2012 Dec 05	RM	Urakaze (former Teruzakura) turns 65 and retires.
2012 Oct 22	RM	Tatsutagawa (former Yutakayama) turns 65 and retires.
2012 Oct 16	KC	Oshiogawa (former Kakizoe) changes to Ikazuchi. After loaning his first kabu he is now owning his new one.
2012 Oct 02	RM	Iwatomo (former Tochiisami) turns 65 and retires.
2012 Sep 20	RO	Riji Ikazuchi (former Kasugafuji) retires after submitting wrong expense statements and having an adulterous affair with a married Kyokai employee. His posts in the board of directors are distributed between Kokonoe (former Chiyonofuji) and Hakkaku (former Hokutoumi).
2012 Aug 30	KC	Furiwake (former Musashimaru) changes to Oshima (on loan).
2012 Jul 24	RO	External kanji Terasawa Noritada retires as he is discontent with the myoseki reform as driven by the current rijicho.
2012 Jul ??	OS	The breakaway Takanohana-group is officially recognized as an own ichimon, albeit still called "group" on the Kyokai's website. Tatsunami (former Asahiyutaka), who voted against his ichimon in the 2012 rijikai elections, joins the group. With the loss of its head the former Tatsunami-ichimon renames into Kasugayama-Isegahama-kumiai ("association").
2012 Jun 25	KB	Sendagawa (former Toki), who loaned this kabu, becomes regular owner as the previous owner -- retired oyakata Sendagawa[17] -- had to sell it until March 2013 (retired oyakata may keep their share until three years after retirement and must sell it afterwards).
2012 Jun 05	HC	Sendagawa (former Toki) moves from Kokonoe-beya to Nishikido-beya.
2012 May 26	HS	Hanakago-beya shuts down. Hanakago (former Daijuyama), all other personnel and all rikishi will be attached to Minezaki-beya from now on.
2012 Apr 25	KA	Kakizoe retires and becomes Oshiogawa-oyakata (on loan).
2012 Apr 25	HS	Oshima-beya shuts down as Oshima (former Asahikuni) reaches mandatory retirement age. All rikishi and other personnel will be attached to Tomozuna-beya from now on.
2012 Apr 23	KC	Oshiogawa (former Toki) changes to Sendagawa (on loan).
2012 Apr 12	KC	Sendagawa (former Kinkaiyama) changes to Tagonoura (on loan).
2012 Feb 29	KA	Hamanishiki retires and becomes Kasugayama-oyakata. He continues the heya, to which its former head and now-Ikazuchi (former Kasugayama) is affiliated now.
2012 Feb 29	KC	Kasugayama (former Kasugafuji) changes to Ikazuchi after becoming Riji. This is probably the first change under the new rule that no head of a heya should be in the board of directors (to avoid a double workload and to be able to concentrate on one job).
2012 Feb 22	OS	A third external Kanji is appointed, Toshio Kamiyama (certified public accountant).
2012 Feb 13	PA	Tagonoura (former Kushimaumi) passes away of ischemic heart failure at the age of 46. His heya (8 rikishi, no urakata) will be absorbed into Dewanoumi-beya, where he has been as an active rikishi.
2012 Feb 11	KC	Ikazuchi (former Kirinishiki) changes to Katsunoura (on loan).
2012 Jan 30	OS	The Kyokai elects a new board of directors. Again there is a crucial vote as eleven oyakata run for only ten posts. The full election thread can be found here. Most important results: Kitanoumi (Ichidai Toshiyori) is Rijicho again, Kokonoe (former Chiyonofuji) is Operations Directors and inofficial Number 2, Hakkaku (former Hokutoumi) is PR Director and inofficial Number 3, making it an all-yokozuna group at the top of the Kyokai. For the first time ever the Shimpan Director is a man who has not been yokozuna or ozeki (Kagamiyama, former Tagaryu) and a Toshiyori ranked man is member of the Shimpan department (Azumazeki, former Ushiomaru). The three first ever external directors step down and are replaced by Katsuji Ebisawa (former head of the Yokozuna Deliberation Council, former head of District Public Prosecutor's special investigations department, Director at the Japanese Red Cross) and Norio Munakata (lawyer) as Riji and ... Okabe (priest and head of a high school) as Kanji.
2012 Jan 22	KA	Tochinonada retires and becomes Takenawa-oyakata.
2012 Jan 21	RO	Takenawa (former Yotsukasa) retires at the age of 38.
2011 Dec 28	HC	Oyama (former Daihi) moves from Takasago-beya to Azumazeki-beya.
2011 Nov 21	KA	Tamanoshima retires and becomes Nishiiwa-oyakata (on loan).
2011 Nov 08	KC	Nishiiwa (former Takanotsuru) changes to Naruto and continues the heya (of his late shisho) he has been affiliated to until now.
2011 Nov 07	PA	Naruto (former Takanosato) passes away of respiratory failure at the age of 59.
2011 Sep 26	RM	Katsunoura (former Fujinokawa) turns 65 and retires.
2011 Sep 25	KS	Being one day before mandatory retirement age, Isenoumi (former Fujinokawa) switches his kabu with affiliated oyakata Katsunoura (former Kitakachidoki). The new Isenoumi continues the heya.
2011 Jul 20	KA	Kaio retires and becomes Asakayama-oyakata.
2011 Jul 14	KC	Asakayama (former Kirinishiki) changes to Ikazuchi (on loan).
2011 Jun 30	RM	Ikazuchi (former Haguroiwa) turns 65 and retires.
2011 Jun 16	HS	Takashima-beya shuts down. Takashima (former Koboyama) and all other personnel (but no remaining rikishi as the last one retired) will be attached to Kasugayama-beya from now on.
2011 May 14	KA	Hokutoriki retires and becomes Tanigawa-oyakata.
2011 May 04	KA	Futeno retires and becomes Inagawa-oyakata.
2011 Apr 26	KC	Inagawa (former Kinkaiyama) changes to Sendagawa (on loan).
2011 Apr 18	PA	Retired oyakata Sendagawa (former Wakanaruto) passes away of heart failure at the age of 72.
2011 Apr 06	OS	In the wake of the yaocho scandals more punishments are handed out; many oyakata who were found guilty of not supervising their rikishi properly are demoted one or more ranks.
2011 Apr 06	RO	Tanigawa (former Kaiho) is dismissed at the age of 38 after being found guilty during the yaocho investigations (but was adamant that he is innocent and thus refused to retire "voluntarily").
2011 Apr 06	KC	Sendagawa (former Yotsukasa) changes to Takenawa (on loan).
2011 Apr 05	RO	Takenawa (former Kasuganishiki) retires at the age of 36 after being found guilty during the yaocho investigations.
2011 Apr 04	RO/KB	Active rikishi Shimotori retires at the age of 33 after being found guilty during the yaocho investigations. His Nishikijima-kabu (that is rent to former Zaonishiki) is acquired by Toyonoshima.
2011 Feb 02	OS	Some oyakata are taking over other jobs at the kyokai: Musashigawa (former Mienoumi) replaces Isenoumi (former Fujinogawa) as Acting Sumo Museum Curator. Takadagawa (former Akinoshima) changes to the Jungyo department, his old tasks in Operations, Information, Lifestyle Guidance (CMT) and General Enterprises (Ass. Supervisor) are not re-assigned for the moment. Joining him is Oshiogawa (former Toki). They replace Edagawa (former Aogiyama), who moves to the Osaka Basho team, and Kitajin (former Kirinji), who does not pick up a new role. At the same meeting Takasago (former Asashio) is re-promoted to Iin while Yamawake (former Buyuzan) and Otake (former Dairyu) are promoted to Shunin, the latter one earning his first promotion after 13 years as oyakata, but since he has been loaning his kabu until just a year ago he hasn't been eligible for promotion earlier.
2011 Jan 23	HS	Kiriyama-beya shuts down. Kiriyama (former Kurosegawa), Urakaze (former Teruzakura), almost all other personnel (eight persons, many of them "inherited" from the old Isegahama-beya and thus changing their heya once more) and the four remaining rikishi will be attached to Asahiyama-beya from now on. One gyoji and one tokoyama move to Oitekaze-beya, one yobidashi moves to Tomozuna-beya.
2011 Jan 23	KA	Kasuganishiki retires and becomes Takenawa-oyakata (on loan).
2011 Jan 23	KC	Takenawa (former Tochisakae) changes to Kiyomigata (on loan).
2011 Jan 21	KB	Tochiozan buys Kiyomigata-kabu from Kiyomigata[10] (former Dairyugawa).
2011 Jan 20	RM	Kiyomigata (former Dairyugawa) turns 65 and retires.
2011 Jan 17	OS	Takadagawa's (former Akinoshima) heya joins Nishonoseki-ichimon. Since the breakaway of Takanohana (Ichidai Toshiyori) and his group has never officially been recognized there is no renegade heya any more now.
2010 Dec 29	KS	At the command ("recommendation") of the rijikai Miyagino (former Kanechika) switches his kabu with Kumagatani (former Chikubayama). The new Miyagino continues the heya that he has headed for some years already, but soon after states that he sees himself just as caretaker of the heya until someone qualified comes along (obviously speaking of Hakuho). The old Miyagino was caught on audio tape bragging about yaocho but insisted that he had been medicated at that time. Additionally to the forced switch the old Miyagino is demoted to Toshiyori and will never again be allowed to become a stablemaster.
2010 Dec 15	KA	Tosanoumi retires and becomes Tatekawa-oyakata.
2010 Nov 28	KC	Tatekawa (former Kirinishiki) changes to Asakayama (on loan).
2010 Sep 29	HR	Fujishima (former Musoyama) takes over his shisho's Musashigawa-beya, which is subsequently renamed into Fujishima-beya. Musashigawa (former Mienoumi) stays with the heya but concentrates on his duties as a director of the NSK.
2010 Sep 26	KA	Iwakiyama retires and becomes Sekinoto-oyakata.
2010 Sep 08	OS	Some more verdicts after the gambling scandal: Another two Iin are demoted to Toshiyori. Sadogatake (former Kotonowaka) for not instructing dismissed ex-Kotomitsuki well and Matsugane (former Wakashimazu) for having some gamblers in his heya and renting logdings from yakuza members. Both lose their place in the Shimpan group (Sadogatake moves to Jungyo department, Matsugane to SCIC) and are replaced by Minatogawa (former Daitetsu) and Minezaki (former Misugiiso). Sanoyama (former Chiyotaikai), whose name was also mentioned in a weekly magazine, comes away with no punishment ("choose to ignore the article").
2010 Sep 01	KC	Asakayama (former Toki) changes to Oshiogawa (on loan).
2010 Sep 01	KC	Sekinoto (former Buyuzan) changes to Yamawake (on loan).
2010 Aug 31	RO	Yamawake (former Wakanoyama) retires at the age of 38. His vacated place in the Shimpan department is taken by Fujishima (former Musoyama).
2010 Aug 12	OS	Hanaregoma (former Kaiketsu) is elected as new Rijicho as Musashigawa (former Mienoumi) stepped back from this post citing health reasons, having been hospitalized some weeks already during the scandal around Ozumo having ties to organized crime groups. At the same time one more of the external Kanji spots is filled by Terasawa Noritada (former Vice President of the Develompent Bank of Japan). Some internal Riji change their departments, a full list of changes can be found here.
2010 Aug 09	RO	Oshiogawa (former Wakatoba) retires because of personal reasons at the age of 33. New owner of the kabu is Takekaze (active rikishi).
2010 Aug 06	PA	Retired oyakata Oshiogawa (former Daikirin) passes away at the age of 68.
2010 Aug 06	HC	Futagoyama (former Kobo) moves from Miyagino-beya to Takanohana-beya as he sees no future in his old ichimon (he voted against his ichimon's riji candidate in the 2010 elections).
2010 Jul 27	KS	Being close to mandatory retirement age, Minato (former Yutakayama) switches his prestiguous kabu with Tatsutagawa (former Minatofuji). The new Minato continues the heya.
2010 Jul 18	KA	Kaiho retires and becomes Tanigawa-oyakata (on loan).
2010 Jul 10	KC	Tanigawa (former Shikishima) changes to Ajigawa (on loan).
2010 Jul 07	KC	Ajigawa (former Kobo) changes to Futagoyama (on loan).
2010 Jul 04	(KC)	Futagoyama (former Dairyu) takes over kabu and heya from Otake (former Takatoriki) as the latter one is fired by the Kyokai for being heavily involved in illegal basebal gambling.
2010 Jul 04	OS	The new external committee for dealing with the gambling scandal hands out the first verdicts. Active rikishi Kotomitsuki and Otake (former Takatoriki) are banned for lifetime from Ozumo because of their heavy involvement in illegal gambling. Onomatsu (former Masurao) is demoted from Iin to Toshiyori for ten years as his heya has been sort of a centre of the illegal activities, Tokitsukaze (former Tokitsuumi) is demoted from Shunin to Toshiyori for five years. All Riji get salary cuts, the Rijicho Musashigawa (former Mienoumi) even -30% for July and August. The Rijicho will be replaced by external Riji Murayama, who will serve as Acting Rijicho for the next month.
2010 May 30	HS	Kise-beya is shut down. After acquiring basho tickets for a crime syndicate Kise (former Higonoumi) is demoted from Iin to Toshiyori and forced to merge his heya into Kitanoumi's (Ichidai Toshiyori) heya; the second option of Mihogaseki (former Masuiyama), Kise's "mother heya" is succcessfully fought against by Kise himself. Another oyakata involved in the scandal -- to a lesser extent -- is Kiyomigata (former Dairyugawa) who gets away with a warning.
2010 Mar 09	KA	Kitazakura retires and becomes Onogawa-oyakata (on loan).
2010 Mar 09	KC	Onogawa (former Yotsukasa) changes to Sendagawa (on loan).
2010 Mar 08	RM	Sendagawa (former Maenoyama) turns 65 and retires.
2010 Feb 10	OS	After Asashoryu allegedly had punched an acquaintance and is forced to retire, Takasago (former Asashio) is demoted from Yakuin Taigu to Shunin for not being able to control his deshi. His new job will be "person in charge of the emergency exits" in Haru Basho.
2010 Feb 04	KS	Being still five years away from mandatory retirement age but of delicate health, Kataonami (former Tamanofuji) switches his prestiguous kabu with Tateyama (former Tamakasuga). The new Kataonami continues the heya.
2010 Jan 22	KA	Tamarikido retires and becomes Araiso-oyakata (on loan).
2010 Jan 22	OS	As Takanohana (Ichidai Toshiyori) has not been made an official rijikai candidate the six oyakata Futagoyama (former Dairyu), Magaki (former Wakanohana), Onomatsu (former Masurao), Otake (former Takatoriki), Otowayama (former Takanonami) and Tokiwayama (former Takamisugi) also decide to leave Nishonoseki-ichimon.
2010 Jan 13	KA	Chiyotaikai retires and becomes Sanoyama-oyakata.
2010 Jan 13	KC	Sanoyama (former Toki) changes to Asakayama (on loan).
2010 Jan 8	OS	Being not nominated as official rijikai candidate Takanohana (Ichidai Toshiyori) decides to leave Nishonoseki-ichimon.
2009 Sep 27	KC	Araiso (former Kotonishiki) changes to Hidenoyama (on loan).
2009 Sep 03	KC	Tochiazuma (Jun Toshiyori) changes to Tamanoi and takes over his father's heya.
2009 Sep 02	RM	Tamanoi (former Tochiazuma) turns 65 and retires.
2009 Aug 05	KS	Being close to mandatory retirement age, Takadagawa (former Maenoyama) switches his prestiguous kabu with Sendagawa (former Akinoshima). The new Takadagawa continues the heya.
2009 Jul 23	KA	Dejima retires and becomes Onaruto-oyakata.
2009 Jul 23	KC	Onaruto (former Buyuzan) changes to Sekinoto (on loan).
2009 Jul 23	KC	Sekinoto (former Yotsukasa) changes to Onogawa (on loan).
2009 Jul 19	RM	Hidenoyama (former Hasegawa) turns 65 and retires.
2009 Jun 16	KC	Onogawa (former Ushiomaru) changes to Azumazeki.
2009 Jun 15	RM	Azumazeki (former Takamiyama) turns 65 and retires.
2009 May 24	KA	Ushiomaru retires and becomes Onogawa-oyakata (on loan). He will take over his shisho's kabu and heya soon as Azumazeki (former Takamiyama) reaches mandatory retirement age in June.
2009 May 07	KB	Futeno buys Inagawa-kabu (that is rent to former Kinkaiyama) from Inagawa[11] (former Yoshinohana).
2009 Mar 28	KA	Otsukasa retires and becomes Wakafuji-oyakata.
2009 Mar 24	KC	Onogawa (former Shikishima) changes to Tanigawa (on loan).
2009 Feb 02	OS	At a Kyokai's executive meeting Oguruma (former Kotokaze) is demoted from Iin to Toshiyori as his deshi Wakakirin has been found guilty of drug use. Both earlier demoted Magaki (former Wakanohana) and Otake (former Takatoriki) have apparently worn sackcloth and ashes long enough and are re-promoted one rank to Yakuin Taigu and Shunin, repsectively. At the same meeting some vice directors are re-assigned to other departments: Takanohana (Ichidai Toshiyori) takes over Jungyo and Security and gives up Shimpan, Takasago takes over Shimpan and gives up SCIC, Minato (former Yutakayama) takes over Guidance and gives up Jungyo and Security, Magaki takes over Guidance (vice). The SCIC and Sumo Training School vice seats become empty. Within the Operations department there is a Crisis Management Team installed, its first members ever are Sendagawa (former Akinoshima) and Tochiazuma (Jun Toshiyori).
2009 Jan 13	KC	Asakayama (former Kotonishiki) changes to Araiso (on loan).
2009 Jan 05	KB	Kisenosato buys Araiso-kabu (currently vacant) from Araiso[12] (former Futagodake).
2008 Dec 24	RM	Tanigawa (former Shiratayama) turns 65 and retires.
2008 Dec 23	OS	It is announced that Sendagawa (former Akinoshima) will inherit Takadagawa's (former Maenoyama) heya in August 2009. The latter one has some time left until mandatory retirement but he wants the former one "to get accustomed to things."
2008 Nov 14	RM	Araiso (former Futagodake) turns 65 and retires.
2008 Oct 22	KC	Musashimaru (Jun Toshiyori) changes to Furiwake (on loan). With that change he moves from the Iin Taigu Toshiyori rank (highest Toshiyori) to the end of the list as newest kabu borrower.
2008 Sep 30	OS	After the recent scandals the Ministry of Education demanded that external directors be chosen. Appointed as of today are Hiroyoshi Murayama (former Superintendent of Tokyo's Prosecutor's Office) and Shigeru Ito (former professor at Tokyo and Keio Universities) as Riji and Jun Yoshino (former Chief of National Police Agency) as Kanji. The "internal" Kanji Mihogaseki (former Masuiyama), Minato (former Yutakayama) and Shiranui (former Aobajo) become Fukuriji (new rank).
2008 Sep 29	KC	Wakafuji (former Yotsukasa) changes to Sekinoto (on loan).
2008 Sep 28	HS	Araiso-beya shuts down. Araiso (former Futagodake) will work at Matsugane-beya until his mandatory retirement in six weeks. The heya personnel will move to Matsugane-beya, too, while the deshi will move to Hanakago-beya.
2008 Sep 28	KC	Sekinoto (former Kinkaiyama) changes to Inagawa (on loan).
2008 Sep 28	KA	Tamakasuga retires and becomes Tateyama-oyakata.
2008 Sep 27	RO	Tateyama (former Ozutsu) retires at the age of 52.
2008 Sep 08	OS	At a Kyokai's executive meeting Kitanoumi (Ichidai Toshiyori) steps down as Rijicho and is demoted to Riji as his deshi Hakurozan has been found guilty of drug use. The new Rijicho Musashigawa (former Mienoumi) is elected unanimously. Kitanoumi takes over the vacant Osaka Basho department, Isenoumi (former Fujinogawa) will head Musashigawa's departments in addition to his own ones in the future.
2008 Sep 08	OS	At a Kyokai's executive meeting Otake (former Takatoriki) is demoted from Iin to Toshiyori as his deshi Roho has been found guilty of drug use.
2008 Sep 03	RM	Inagawa (former Yoshinohana) turns 65 and retires.
2008 Aug 21	OS	At a Kyokai's executive meeting Magaki (former Wakanohana) steps down as Riji and is demoted to Iin as his deshi Wakanoho has been found guilty of drug use. His department (Osaka Basho) remains headless for the moment, and ironically he is assigned to the Lifestyle Guidance department. Offers by former Taiho (Ichidai Toshiyori) and Hidenoyama (former Hasegawa) to help out managing Magaki-beya go unheard.
2008 Jul 07	RM	Furiwake (former Asaarashi) turns 65 and retires.
2008 Jun ??	KB	Iwakiyama buys Sekinoto-kabu (that is rent to former Kinkaiyama) from Sekinoto[13] (former Fukunohana). (The sale was officially confirmed on 2008 Sep 28.)
2008 Apr 24	KB	Oshiogawa (former Wakatoba), who loaned this kabu, becomes regular owner as the previous owner had to sell it (according to the new rule that every oyakata must sell his kabu within three years after retirement).
2008 Feb 07	HC	Sanoyama (former Toki) moves from Takasago-beya to Kokonoe-beya.
2008 Jan 24	KB	Takamisakari buys Furiwake-kabu. Its current holder, former Asaarashi, will have his mandatory retirement in six months. Note: When Musashimaru rented Furiwake-kabu in October 2008 Asaarashi was named as the (still) owner of the kabu.
2008 Jan 24	KA	Tochinohana retires and becomes Hatachiyama-oyakata.
2008 Jan 24	KA	Tochisakae retires and becomes Takenawa-oyakata (on loan).
2008 Jan 24	KC	Hatachiyama (former Yotsukasa) changes to Wakafuji (on loan).
2008 Jan 23	RO	Takenawa (former Harunoyama) retires at the age of 31.
2008 Jan 23	RO	Wakafuji (former Asanosho) retires at the age of 38.
2008 Jan ??	KB	Otsukasa buys Wakafuji-kabu (that is rent to former Asanosho) from Wakafuji[12] (former Katsuhikari). (The sale was officially confirmed on 2008 Mar 15.)
2007 Dec 07	KA	Kobo retires and becomes Ajigawa-oyakata (on loan).
2007 Nov 30	KB	Aminishiki acquires Ajigawa-kabu.
2007 Nov 30	KC	Ajigawa (former Asahifuji) changes to Isegahama. Ajigawa-beya is subsequently renamed into Isegahama-beya.
2007 Nov 25	KC	Harunoyama (Jun Toshiyori) changes to Takenawa (on loan). With that the official Jun Toshiyori spots (i.e. Sekiwake and below) have finally disappeared.
2007 Nov 25	KA	Buyuzan retires and becomes Onaruto-oyakata (on loan).
2007 Nov 24	RO	Onaruto (former Kotogaume) retires at the age of 44.
2007 Nov 11	HC	Hamakaze (former Gojoro) moves from Magaki-beya to Sadogatake-beya because of "personal circumstances".
2007 Oct 06	KB	Shimootori buys Nishikijima-kabu (that is rent to former Zaonishiki) from Tokitsuumi.
2007 Oct 06	KA	Tokitsuumi retires and becomes Tokitsukaze-oyakata. The date is for the books only to avoid a shisho-less heya. Actually the change happened on Oct 09 after some days of seeking a new suitable Tokitsukaze and finishing all the intai formalities for a rikishi.
2007 Oct 05	RO	Tokitsukaze (former Futatsuryu) is expelled from the Kyokai after the police charged him for causing the death of a 17 year old deshi. During the investigation it became clear that the young rikishi died from a vicious butsugari session and hazing by senior rikishi (which was not stopped or even encouraged by Tokitsukaze, who himself hit the boy with a beer bottle one day earlier). He is demanded to give up his kabu at once.
2007 Aug 29	KA	Wakatoba retires and becomes Oshiogawa-oyakata (on loan). The retirement announcement has leaked some months ago, but Wakatoba retired officially only now as Oshiogawa-kabu (owned by his former shisho) was freed.
2007 Aug 28	KC	Oshiogawa (former Asanosho) changes to Wakafuji (on loan).
2007 Aug 27	KB	Shiratama (former Kototsubaki), who loaned this kabu, becomes regular owner as the previous owner died two weeks ago.
2007 Aug 27	OS	Michinoku (former Kirishima) is assigned to the Shimpan department and replaces Tokitsukaze (former Futatsuryu).
2007 Aug 14	PA	Retired oyakata Sadogatake (former Kotozakura) passes away of blood poisoning at the age of 66.
2007 Aug 09	RM	Wakafuji (former Katsuhikari) turns 65 and retires.
2007 Aug 03	KC	Isegahama (former Katsuhikari) changes back to his own kabu Wakafuji after he has been the interm-Isegahama for a year and finalized the shutdown of the prestiguous heya.
2007 Jul 19	KC	Takenawa (former Kotonishiki) changes to Asakayama (on loan).
2007 May 31	KC	Takanotsuru (Jun Toshiyori) changes to Nishiiwa (on loan).
2007 May 30	RO	Nishiiwa (former Wakanojo) retires at the age of 34.
2007 May 30	KC	Toki (Jun Toshiyori) changes to Sanoyama (on loan).
2007 May 29	KC	Sanoyama (former Zaonishiki) changes to Nishikijima (on loan).
2007 May 18	KC	Kinkaiyama (Jun Toshiyori) changes to Sekinoto (on loan).
2007 May 16	KC	Nishikijima (former Shikishima) changes to Onogawa (on loan).
2007 May 07	KA	Tochiazuma retires and becomes Tochiazuma-oyakata (Jun Toshiyori).
2007 Apr 17	PA	Retired oyakata Tamagaki (former Wakanami) passes away of heart complications after a pneumonia at the age of 66.
2007 Feb 15	KC	Sekinoto (former Asanosho) changes to Oshiogawa (on loan).
2007 Feb 01	HS	Isegahama-beya shuts down. Gyoji Shikimori Kinnosuke will move to Takashima-beya, all other personnel and deshi move along with Isegahama (former Katsuhikaru) to Kiriyama-beya.
2007 Jan 29	OS	Tamanoi (former Tochiazuma) is promoted to Yakuin Taigu Iin.
2007 Jan 29	OS	Oitekaze (former Daishoyama) is assigned to the Shimpan department and replaces Takashima (former Koboyama).
2006 Dec 26	KC	Onogawa (former Ganyu) changes to Yamahibiki.
2006 Dec 26	KC	Yamahibiki (former Dairyu) changes to Futagoyama (on loan).
2006 Dec 13	OS	The Kyokai decides to abolish the Jun Toshiyori status. The current holders of a Jun Toshiyori share may go on though until it expires.
2006 Nov 27	KC	Gojoro (Jun Toshiyori) changes to Hamakaze.
2006 Nov 26	RO	Hamakaze (former Misugisato) retires at the age of 44.
2006 Nov 20	RM	Wakafuji (former Kiyokuni) turns 65 and retires.
2006 Nov 19	KS	Being one day before mandatory retirement age, Isegahama (former Kiyokuni) switches his kabu with affiliated oyakata Wakafuji (former Katsuhikari). The new Isegahama continues the heya, but is already 64 years old and thus has just one year left to lead the heya into a brighter future than his predecessor could. It was totally unclear until today what would happen to the prestiguous Isegahama-kabu.
2006 Nov 19	OS	The Rijikai decides in its meeting that there will be no raise of salaries for the sixth straight year.
2006 Nov 18	KA	Harunoyama retires and becomes Harunoyama-oyakata (Jun Toshiyori).
2006 Sep 28	KC	Yotsukasa (Jun Toshiyori) changes to Hatachiyama (on loan).
2006 Sep 27	OS	The Kyokai issues guidelines for opening an own heya. This is done as the number of 54 heya (compared to currently 109 oyakata) seems to high and to make sure "to bring up rikishi well." Some speculate that there is also a big portion of protectionism involded, giving a big advantage to heya owners (some talented oyakata with a good sense for scouting can't branch out any more and have to stay -- and with them the cash). The rules are as follows: At least 25 basho in Sanyaku or at least 60 basho in Makuuchi. Yokozuna and Ozeki can establish a heya regardless of basho number, but may branch out at the earliest one year after their intai. For inheriting a heya you still need 12 Makuuchi basho or 20 as sekitori.
2006 Sep 18	KB	Tochinohana buys Hatachiyama-kabu from the heirs of the deceased Hatachiyama[13] (former Hokutenyu).
2006 Aug 01	HB	Onoe (former Hamanoshima) branches out from Mihogaseki-beya and opens up his own.
2006 Jun 23	(HM)	The Kyokai announces that the rikishi and urakata at deceased Hatachiyama's (former Hokutenyu) heya will move to Kitanoumi-beya. Kitanoumi (Ichidai Toshiyori) was heya mate of Hatachiyama in their rikishi days and their shisho had the hope to rise them both to Yokozuna, "one on the east, and the other one on the west."
2006 Jun 22	PA	Hatachiyama (former Hokutenyu) passes away of pancreatic cancer at the age of 45.
2006 Jun 20	RO	Oshiogawa (former Daikirin) retires at the age of 64 as he feels too tired to complete the last year.
2006 May 29	PA	Retired oyakata Izutsu (former Tsurugamine) passes away of blood poisoning at the age of 77.
2006 May 21	KA	Kinkaiyama retires and becomes Kinkaiyama-oyakata (Jun Toshiyori).
2006 May 18	KA	Takanotsuru retires and becomes Takanotsuru-oyakata (Jun Toshiyori).
2006 May 05	KA	Toki retires and becomes Toki-oyakata (Jun Toshiyori).
2006 Apr 28	RO	Kotoryu (Jun Toshiyori) retires at the age of 34 to help at his father's business.
2006 Apr 24	OS	Fujishima (former Musoyama) is assigned to the Shimpan department because of the severe illness of judge Hatachiyama (former Hokutenyu).
2006 Mar 02	KC	Asakayama (former Tomonohana) changes to Tamagaki.
2006 Mar 01	RM	Tamagaki (former Wakanami) turns 65 and retires.
2006 Jan 21	KB	Asakayama (former Tomonohana) buys Tamagaki-kabu. Its current holder, former Wakanami, will have his mandatory retirement in one week.
2006 Jan 30	OS	The Rijikai elections for 2006/2007 took place. Here is a little article on the elections.
2005 Nov 27	KA	Yotsukasa retires and becomes Yotsukasa-oyakata (Jun Toshiyori).
2005 Nov 26	RM	Sadogatake (former Kotozakura) turns 65 and retires.
2005 Nov 25	(KA)	Kotonowaka retires. As soon as his father-in-law turns 65, he will become Sadogatake-oyakata.
2005 Nov 17	KA	Gojoro retires and becomes Gojoro-oyakata (Jun Toshiyori).
2005 Aug 11	KA	Wakanoyama retires and becomes Yamawake-oyakata. The number of vacant kabu reduces to one.
2005 Aug 09	KC	Yamawake (former Kototsubaki) changes to Shiratama (on loan).
2005 Aug 08	KC	Shiratama (former Zaonishiki) changes to Sanoyama (on loan).
2005 Aug 05	KB	Tokitsuumi buys Nishikijima-kabu (that is rent to former Shikishima) from his former shisho Nishikijima[14] (former Yutakayama).
2005 Aug 05	KC	Sanoyama (former Asanosho) changes to Sekinoto (on loan).
2005 Jul 13	OS	Within two days, both Tateyama (former Ozutsu) and Tokitsukaze (former Futatsuryu) were hospitalized with light strokes. While 49 years old Tateyama (who is known to suffer from diabetes) is scheduled to return soon, the 55 years old Tokitsukaze will be kyujo for at least two weeks.
2005 Jul 01	RM	Sekinoto (former Fukunohana) turns 65 and retires.
2005 Jun 04	KB	Wakanosato buys Nishiiwa-kabu (that is rent to former Wakanojo) from Nishiiwa[7] (former Daimonji).
2005 May 30	PA	Futagoyama (former Takanohana) passes away of cancer of the mouth at the age of 55.
2005 May 29	RM	Taiho (Ichidai Toshiyori) turns 65 and retires. As he is/was an outstanding person in the Kyokai, he is made Sumo Museum Director. He will continue under the name of Taiho at this post.
2005 May 28	KC	Oikari (Jun Toshiyori) changes to Kabutoyama.
2005 May 27	RM	Kabutoyama (former Daiyu) turns 65 and retires.
2005 May 16	KC	Wakanojo (Jun Toshiyori) changes to Nishiiwa (on loan). There are no vacant kabu left at the moment.
2005 Apr 28	KA	Asanowaka retires and becomes Wakamatsu-oyakata. The number of vacant kabu reduces to one.
2005 Apr 28	KC	Wakamatsu (former Asanosho) changes to Sanoyama (on loan).
2005 Apr 25	KC	Sanoyama (former Dairyu) changes to Yamahibiki (on loan).
2005 Apr 20	HC	Asakayama (former Tomonohana) moves from Tatsunami-beya to Tomozuna-beya.
2005 Apr 19	KA	Kotoryu retires and becomes Kotoryu-oyakata (Jun Toshiyori).
2005 Mar 27	RM	Nishiiwa (former Daimonji) has turned 65 one month ago and retires. He was allowed to stay a bit longer because he was responsible for the Osaka tournament which ended this day. The number of vacant kabu increases to two.
2005 Mar 27	HS	Oshiogawa-beya shuts down. The remaining deshi move along with Oshiogawa (former Daikirin) to Oguruma-beya, where the rest of the personnel has moved to already.
2005 Jan 31	OS	Some oyakata have been assigned to new posts: With Nishiiwa (former Daimonji) retiring soon, Fujigane (former Daizen) and Nakagawa (former Asahisato) join the Osaka Basho Operations team. Both originate from Osaka. Sekinoto (former Fukunohana), facing mandatory retirement in July, steps back from his post as Kokugikan Operations Officer.
2005 Jan 27	OS	Nishiiwa (former Daimonji) will turn 65 in one month and have to retire then. Being a Regional Basho Officer for Osaka (March tournament), the Kyokai acknowledged his retirement taking place after the basho.
2005 Jan 05	HC	Tatsutayama (former Sasshunada) moves from Izutsu-beya to Michinoku-beya.
2004 Dec 28	KB	Tochinonada buys Takenawa-kabu (that is rent to former Kotonishiki) from his former master and now retired Takenawa (former Tochinoumi).
2004 Dec 22	KB	Tosanoumi buys Tatekawa-kabu (that is rent to former Kirinishiki) from Isenoumi (former Fujinogawa).
2004 Dec 01	HC	Shiranui (former Aobajo) moves from Oshiogawa-beya to Oguruma-beya.
2004 Nov 26	KA	Oikari retires and becomes Oikari-oyakata (Jun Toshiyori).
2004 Nov 16	KA	Musoyama retires and becomes Fujishima-oyakata. The number of vacant kabu reduces to one.
2004 Nov 04	OS	Jonosuke wrote an excellent article about the genesis of Nishonoseki-ichimon. Besides the ichimon history from its beginning the article is a good introduction into the ichimon system. Highly recommended!
2004 Sep 27	HB	Chiganoura (former Masudayama) branches out from Kasugano-beya and opens up his own.
2004 Sep 24	OS	Isegahama loses his post as Yakuin Taigu (Vice Director of the Lifestyle Guidance Department) after he has spoken out to the Weekly Shukan Post.
2004 Sep 27	HC	Sendagawa (former Akinoshima) moves from Takanohana-beya to Takadagawa-beya.
2004 Aug 26	KA	Kanechika retires and becomes Miyagino-oyakata (and takes over the heya).
2004 Aug 23	KC	Miyagino (former Chikubayama) changes to Kumagatani (on loan). He will stay with Miyagino-beya.
2004 Aug 23	KC	Kumagatani (former Asahisato) changes to Nakagawa (on loan).
2004 Aug 07	KC	Nakagawa (former Zaonishiki) changes to Shiratama (on loan). The number of vacant kabu reduces to two.
2004 May 27	KC	Fujishima (former Akinoshima) changes to Sendagawa.
2004 May 10	KA	Hamanoshima retires and becomes Onoe-oyakata.
2004 May 10	KA	Takanonami retires and becomes Otowayama-oyakata.
2004 May 09	KA	Wakanojo retires and becomes Wakanojo-oyakata (Jun Toshiyori).
2004 Apr 18	KC	Otowayama (former Takamisugi) changes to Tokiwayama (on loan).
2004 Apr 16	RM	Tokiwayama (former Wakachichibu) turns 65 and retires.
2004 Mar 31	HS	Takekuma-beya shuts down. Takekuma (former Kurohimeyama) was the only person in the heya after the retirement of the last deshi and continues to work at Tomozuna-beya.
2004 Feb 07	RM	Sendagawa (former Wakanaruto) turns 65 and retires.
2004 Feb 01	HB	Shikoroyama (former Terao) branches out from Izutsu-beya and opens up his own.
2004 Feb 01	HR	Takanohana (Ichidai Toshiyori) takes over his father's Futagoyama-beya, which is subsequently renamed into Takanohana-beya. Futagoyama (former Takanohana) stays with the heya but concentrates on his duties as a director of the NSK.
2004 Jan 23	KA	Oginishiki retires and becomes Nakadachi-oyakata.
2003 Dec 17	PA	Retired oyakata Wakamatsu (former Fujinishiki) passes away of a liver disease at the age of 66.
2003 Dec 01	HB	Kise (former Higonoumi) branches out from Mihogaseki-beya and opens up his own.
2003 Nov 18	KA	Aogiyama retires and becomes Edagawa-oyakata.
2003 Nov 17	KC	Edagawa (former Zaonishiki) changes to Nakagawa (on loan).
2003 Nov 16	KA	Musashimaru retires and becomes Musashimaru-oyakata (Jun Toshiyori).
2003 Nov 06	RO	Akebono (Jun Toshiyori) retires at the age of 34 to join K-1.
2003 Sep 30	KC	Asanosho (Jun Toshiyori) changes to Wakamatsu (on loan).
2003 Sep 19	KC	Wakamatsu (former Kotonishiki) changes to Takenawa (on loan).
2003 Sep 17	KC	Shiratama (former Kototsubasa) changes to Yamawake (on loan). Shiratama-kabu becomes vacant.
2003 Jun 18	RO	Daishi (Jun Toshiyori) retires at the age of 35 to start a career as singer.
2003 Jun 16	RM	Nakagawa (former Oiteyama) turns 65 and retires.
2003 May 24	KA	Akinoshima retires and becomes Fujishima-oyakata.
2003 Apr 28	PA	Yamawake (former Tochifuji) passes away of cardiac infarction at the age of 56.
2003 Mar 23	KS	Takanohana and Akinoshima change their kabu Fujishima and Yamahibiki.
2003 Mar 21	KA	Daizen retires and becomes Fujigane-oyakata.
2003 Mar 13	RM	Takenawa (former Tochinoumi) turns 65 and retires.
2003 Feb 24	KS	Being close to mandatory retirement age, Kasugano (former Tochinoumi) switches his prestiguous kabu with Takenawa (former Tochinowaka). The new Kasugano continues the heya.
2003 Feb 17	RM	Nakadachi (former Sadanoyama) turns 65 and retires.
2003 Feb 13	KC	Tomonohana (Jun Toshiyori) changes to Asakayama (on loan).
2003 Feb 12	RO	Asakayama (former Owakamatsu) retires at the age of 36 as he could not find another kabu to rent.
2003 Feb 03	HR	Otake (former Takatoriki) takes over his father-in-law's Taiho-beya, which is subsequently renamed into Otake-beya. Taiho (Ichidai Toshiyori) stays with the heya but concentrates on his duties as a director of the NSK.
2003 Jan 27	KS	Being close to mandatory retirement age, Sakaigawa (former Sadanoyama) switches his prestiguous kabu with Nakadachi (former Ryogoku). Nakadachi-beya is subsequently renamed into Sakaigawa-beya.
2003 Jan 22	KC	Fujigane (former Shikishima) changes to Nishikijima (on loan).
2003 Jan 20	KA	Takanohana retires and becomes Takanohana-oyakata (Ichidai Toshiyori). He is only the fourth rikishi to be allowed to take over the name he had as rikishi.
2002 Dec 24	HS	Kabutoyama-beya shuts down. Kabutoyama (former Daiyu) continues to work at Minato-beya.
2002 Dec 01	HB	Nishikido (former Mitoizumi) branches out from Takasago-beya and opens up his own.
2002 Nov 20	KA	Higonoumi retires and becomes Kise-oyakata.
2002 Sep 22	KA	Terao retires and becomes Shikoroyama-oyakata.
2002 Sep 20	HC	Being retired as an active rikishi, Otake (former Takatoriki) finally can join the heya of his father-in-law, Taiho (Ichidai Toshiyori).
2002 Sep 19	KA	Takatoriki retires and becomes Otake-oyakata. Unlike his predecessors, he uses the reading "Otake" instead of "Odake".
2002 Sep 17	KA	Minatofuji retires and becomes Tatsutagawa-oyakata.
2002 Sep 17	KC	Tatsutagawa (former Shikishima) changes to Fujigane (on loan).
2002 Sep 16	KB	Akinoshima acquires Yamahibiki-kabu.
2002 Sep 11	KC	Kotonishiki (Jun Toshiyori) changes to Wakamatsu (on loan).
2002 Sep 09	KC	Odake (former Dairyu) changes to Sanoyama (on loan).
2002 Sep 08	KC	Fujigane (former Zaonishiki) changes to Edagawa (on loan).
2002 Aug 18	RM	Nishikijima (former Yutakayama) turns 65 and retires.
2002 Aug 17	KS	Being close to mandatory retirement age, Tokitsukaze (former Yutakayama) switches his prestiguous kabu with Nishikijima (former Futatsuryu). The new Tokitsukaze continues the heya.
2002 Jun 15	RO	Yamahibiki (former Toyonoumi) retires at the age of 37.
2002 Jun 01	HB	Arashio (former Oyutaka) branches out from Tokitsukaze-beya and opens up his own.
2002 Mar 24	KA	Daishi retires and becomes Daishi-oyakata (Jun Toshiyori).
2002 Mar 18	RM	Wakamatsu (former Fujinishiki) turns 65 and retires.
2002 Feb 05	HM	Being close to mandatory retirement age, Takasago (former Fujinishiki) switches his prestiguous kabu with Wakamatsu (former Asashio). The two heya merge and continue under the name of Takasago.
2002 Jan 30	KC	Shikoroyama (former Kotogaume) changes to Onaruto (on loan).
2002 Jan 17	KC	Shikishima (Jun Toshiyori) changes to Tatsutagawa (on loan).
2001 Dec 27	KA	Asanosho retires and becomes Asanosho-oyakata (Jun Toshiyori).
2001 Dec 18	KC	Ganyu (Jun Toshiyori) changes to Onogawa.
2001 Oct 09	KA	Tomonohana retires and becomes Tomonohana-oyakata (Jun Toshiyori).
2001 Sep 15	KB	Chiyotaikai buys Sanoyama-kabu.
2001 May 14	KA	Shikishima retires and becomes Shikishima-oyakata (Jun Toshiyori).
2001 Apr 06	KB	Hamanoshima buys Onoe-kabu.
2001 Jan 22	KA	Akebono retires and becomes Akebono-oyakata (Jun Toshiyori).
2000 Nov 19	KB	Takanohana "buys" Fujishima-kabu from his brother Wakanohana.
2000 Nov 18	RO	Fujishima (former Wakanohana) retires at the age of 29 to start a career as TV talento, later he plans to become a pro footballer.
2000 Sep 15	KA	Mitoizumi retires and becomes Nishikido-oyakata.
2000 Sep 10	KA	Kotonishiki retires and becomes Kotonishiki-oyakata (Jun Toshiyori).
2000 Aug 22	KA	Kitakachidoki retires and becomes Katsunoura-oyakata.
2000 Aug 01	KC	Oginohana (Jun Toshiyori) changes to Takasaki.
2000 Aug 01	KC	Misugisato (Jun Toshiyori) changes to Hamakaze.
2000 May 06	KA	Ganyu retires and becomes Ganyu-oyakata (Jun Toshiyori).
2000 Mar 17	KA	Wakanohana retires and becomes Fujishima-oyakata.
2000 Mar 16	KC	Fujishima (former Takamisugi) changes to Otowayama.
2000 Feb 01	HB	Tagonoura (former Kushimaumi) branches out from Dewanoumi-beya and opens up his own.