** Hong Kong shares of Chinese electric vehicle maker NIO Inc 9866.HK drop 8.1% to HK$29.9, their lowest point since August 29

** Stock on track for the biggest one-day pct decline since March 21, and on course for a second session of fall, if losses hold

** Stock is top pct loser in the Hang Seng Tech Index .HSTECH, which is down 0.3%

** U.S.-listed stock NIO.N fell 5.7% on Thursday

** NIO offered 136.8 mln shares at HK$29.46 each in an upsized share sale, raising HK$4.03 billion ($518.3 million) for R&D of smart electric vehicle technologies and new products

** Co expects to close the equity placement on or about April 7

** The issue price represents a 9.5% discount to Thursday's close of HK$32.55 per share in Hong Kong

** Hong Kong stock down 13.9%, YTD

($1 = 7.7760 Hong Kong dollars)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))