Small-cap stocks were mainly trading lower Friday. The Russell 2000 lost 0.2% to 717.81, and the S&P SmallCap 600 was off 0.3% at 378.23.

Among the big losers, The Knot ( KNOT) fell to new lows, decling 15% to $9.95. The New York wedding planner announced first-quarter income of $579,000, or 2 cents a share, vs. $1.6 million, or 5 cents a share, a year ago. Analysts polled by Thomson Reuters were looking for EPS of 5 cents.

3D Systems ( TDSC) also fell to a new 52-week low, lately declining 39% to $8.67. The Rock Hill, S.C., multimedia and graphics software company posted a wider first-quarter loss of $3.7 million, or 17 cents a share, from of $3.1 million, or 16 cents a share, a year ago. Analysts were expecting a profit of 4 cents a share.

Deltek ( PROJ) slipped 34% to $8.30. The Herndon, Va.-based maker of enterprise applications software announced first-quarter non-GAAP income of $6.1 million, or 14 cents a share, vs. $6.5 million, or 16 cents a share, in the year-ago quarter. The Street had prognosticated 15 cents a share. Credit Suisse and William Blair cut the stock to hold-equivalent ratings.

High-speed Internet provider Cogent Communications ( CCOI) lost 19% to $18.31. The Washington, D.C., company posted a first-quarter loss of 21 cents a share, vs. 19 cents a year ago. The results disappointed analysts, who had on average predicted a per-share loss of 18 cents.

Also gaining, shares of restaurant chain Cosi ( COSI) surged 20% to $2.68. Excluding the effect of discontinued opperations, the Deerfield, Ill., company narrowed its loss to $2.8 million, or 7 cents a share, from $4.1 million, or 10 cents a share, in the year-ago quarter. The Street expected a loss of 8 cents a share. Revenue increased 6.7% year over year to $33.2 million, ahead of the consensus estimate of $32.4 million.

Systemax ( SYX), a direct marketer of brand-name and private-label products based in Port Washington, N.Y., posted income of $18 million, or 48 cents a share, vs. $13.9 million, or 37 cents a share, a year ago. Revenue improved 7.2% year over year to $725 million. Shares tacked on 17% to $19.38.

Finally, McGrath Rentcorp ( MGRC), which rents and sells relocatable modular buildings and electronic test equipment, saw shares rise 17% to $27.14. The Livermore, Calif., company announced a first-quarter profit of $10.3 million, or 43 cents a share, compared with $9.3 million, or 37 cents a share, in the first quarter of 2007. Wall Street was looking for 38 cents a share.

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