TOKYO, Feb 27 (Reuters) - Japan Post Holdings 6178.T plans to sell its shares in Japan Post Bank 7182.T in a secondary share sale worth as much as 630 billion yen ($4.22 billion), a regulatory filing showed on Thursday.
The sale, first reported by Reuters on Wednesday, comes as corporate governance reforms are accelerating in Japan with "parent-child" listings, where companies have a listed subsidiary, being scrutinised and companies under pressure to increase free-float share ratios.
($1 = 149.3400 yen)
(Reporting by Mariko Katsumura; Editing by Kim Coghill)
((Mariko.Katsumura@thomsonreuters.com;))