(For large-cap stocks to watch, click on [WATCH/US])

Oct 29 (Reuters) - Some small and midcap stocks to watch on Thursday:

TRANSCEPT PHARMACEUTICALS (TSPT.O: Quote, Profile, Research), $11.47, down 40 pct

The company said the U.S. Food and Drug Administration did not approve its experimental sleep disorder drug Intermezzo, citing safety issues. [ID:nBNG93325]

THOMAS WEISEL PARTNERS GROUP (TWPG.O: Quote, Profile, Research), closed at $5.10

The company posted a wider-than-expected quarterly loss but said it expected to return to profitability in 2010. [ID:nBNG436904]

INTERDIGITAL INC (IDCC.O: Quote, Profile, Research), $19.85, up 7 pct

The wireless technology firm posted a better-than-expected third-quarter. [ID:nBNG260543]

HARMONIC INC (HLIT.O: Quote, Profile, Research), closed at $5.94