TOKYO, Oct 17 (Reuters) - Japanese X-ray testing tool

maker Rigaku Holdings priced its initial public

offering at 1,260 yen per share, at the top end of a 1,230 to

1,260 yen range, a regulatory filing showed on Thursday.

That would put Rigaku, backed by buyout firm Carlyle Group ( CG )

, on track to raise 129 billion yen ($862.88 million),

including an overallotment.

The company will list its shares on the Tokyo Stock Exchange

on Oct. 25.

Rigaku's pricing follows that of Tokyo Metro earlier this

week. The subway operator priced its shares at the top of its

indicative range to raise 348.6 billion yen in Japan's largest

IPO in six years.

($1 = 149.5000 yen)