JAPAN
It seems that JAZA - Japanese zoological association has taken up cooperative breeding of pygmy hippo quite seriously with all these moves and recent births (allthough I have not studied the recent history of the Tokyo Ueno group yet)!
Current (???) standings: 5.8
Ishikawa: 1.1 - breeding pair
Kobe Oji: 1.1 - potential breeding pair
Nishimuro - Wakayama: 0.1 - unpaired individual
Nagoya - Higashiyama: 1.1 - potential breeding pair
Osaka NIFREL Aquarium: 1.1 - breeding pair
Tokyo Ueno: 1.3 - breeding pair + offspring
Some history on the Singapore born female at NIFREL - Osaka. She was the last born (unnamed in the 2012 studbook) - b. 17/12/2012 to original breeding pair Bubu X Minah.
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Birth of calf Mirai was on February 21, 2019.
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ミニカバ赤ちゃんの愛称発表!「タムタム」です。よろしくね♪|イベント&ニュース|ニフレル
The Ishikawa female imported from Overloon was originally named "Asabi" (according to the 2012 studbook). Unless she passed away suddenly and another from the same facility was imported (highly doubt that ...). Have not yet found any evidence of a further Overloon export to Japan from there.
For the Ishikawa - Buin Zoo male it would be interesting to know his history (birth date et cetera).
South America
@OC, Affirmative, pygmy hippos are kept at the Buin Zoo - Chile. Breeding pair and with M offspring (as per 2012 studbook). Male Hippolito was born at Thule Zoo in Germany and the female Ndoki was born at Singapore (same parentage as NIFREL-Osaka F from Singapore).
BTW: till date (2012 studbook) Zoo Municipal Buenos Aires also maintained a pygmy hippo pair: Male Ivory from Singapore Zoo (born 1997 different parents to other Singapore born individuals mentioned above), arrived in 2000) and female Frida born 1988 in Leipzig Zoo, Germany.