Shares of Affymetrix ( AFFX) rose sharply after the company posted slight third-quarter profits and broke even on a per-share basis.

The company's shares recently traded up $15.69, or 30%, to $68 in Nasdaq trading.

The Santa Clara, Calif., company, which makes arrays used by scientists to determine gene activity, posted a third-quarter profit of $300,000, or break-even on a per-share basis, compared with a loss of $5.8 million, or 11 cents a share, in the same period last year. Ten analysts polled by First Call/Thomson Financial expected the company to lose 12 cents a share.

Revenue rose 89% to $55.8 million from $29.5 million a year ago, on the strength of sales from its GeneChip arrays.