Rigel Pharmaceuticals Inc. (Nasdaq:RIGL), Sequenom Inc. (Nasdaq:SQNM) and Energy Conversion Devices Inc. (Nasdaq:ENER) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Canadian Solar Inc. (Nasdaq:CSIQ), Force Protection Inc. (Nasdaq:FRPT), Changyou.com Ltd. (Nasdaq:CYOU), Biocryst Pharmaceuticals Inc. (Nasdaq:BCRX), Century Aluminum Co. (Nasdaq:CENX) and SonicWALL Inc. (Nasdaq:SNWL).

Here are the most actively traded companies among small caps:

		Price at 9:08 ET	Change	% Change	Volume	Year High	Year Low
RIGL	RIGEL PHARMACEUTICALS INC	9.30	-2.26	-19.6%	344.0k	27.18	4.19
SQNM	SEQUENOM INC	5.15	+0.03	+0.6%	84.9k	29.14	2.86
ENER	ENERGY CONVERSION DEVICES IN	14.19	+0.71	+5.3%	80.0k	83.20	11.83
CSIQ	CANADIAN SOLAR INC	15.25	+0.89	+6.2%	41.9k	33.24	3.00
FRPT	FORCE PROTECTION INC	5.43	+0.13	+2.5%	36.9k	10.03	1.70
CYOU	CHANGYOU COM LTD	40.23	-0.97	-2.4%	12.7k	48.37	19.00
BCRX	BIOCRYST PHARMACEUTICALS	8.50	-0.08	-0.9%	12.4k	8.72	0.85
CENX	CENTURY ALUM CO	6.77	+0.06	+0.9%	10.4k	62.45	1.04
SNWL	SONICWALL INC	6.97	+0.72	+11.5%	10.4k	6.82	2.90
SOLF	SOLARFUN POWER HOLDINGS CO L	7.05	+0.23	+3.4%	9.9k	21.26	2.27