The top aftermarket NYSE gainers Thursday were: Dolby Laboratories, Heckmann Corp, Leapfrog Enterprises, Cincinnati Bell, LinkedIn Corp and Active Network. The top aftermarket NYSE losers were: TAL International Group, Proto Labs, Northstar Realty Finance, InvenSense and Assisted Living Concepts Inc.

Gainers

Dolby Laboratories (DLB) shares rallied 22.91 percent to $46.25 in aftermarket session. Its second quarter net profit rose to$88.1 million or $0.81 per share from $82.1 million or $0.72 per share in the same period a year-earlier while analysts' expected net income of $0.75 per share. The company also expects fiscal 2012 earnings to be in a range of $2.38 to $2.62 per share on revenues of $910 to $970 million compared to analysts' polled by Reuters expectation of $2.57 per share on revenues of $942.40 million.

Heckmann Corp. (HEK) shares climbed 11.94 percent to $4.03 in post market session. The company expects full year revenue to be in a range of $400 to $420 million, above the analysts' expectation of $370.7 million. Heckmann also reported first quarter adjusted net profit of $0.01 per share on revenues of $55 million.

Leapfrog Enterprises Inc. (LF) shares climbed 11.36 percent to $10.00 in post market session. Its first quarter net loss narrowed to $0.14 per share from $0.34 per share in the same quarter last year. The company currently expects its fiscal 2012 earnings to be in a range of $0.52 to $0.57 per share compared to its prior estimation of $0.40 to $0.45 per share.

Cincinnati Bell Inc. (CBB) shares surged 10.67 percent to $3.94 in post market session. The company announced that it intended to pursue an initial public offering of shares of common stock of a company that would be formed to own and operate CyrusOne, Cincinnati Bell's Data Center business. Cincinnati Bell also reported first quarter net income of $0.05 per share compared to $0.08 per share in the same quarter last year.

LinkedIn Corp. (LNKD) stock surged 8.49 percent to $118.70 in aftermarket session. Its first quarter net profit surged to $5.0 million or $0.04 per from $2.1 million or breakeven per share in the same period last year. Revenue surged more than 100 percent to $188.5 million from $93.9 million. The company currently expects fiscal 2012 revenues to be in a range of $880 to $900 million compared to prior estimation of $840 to $860 million.

Active Network, Inc. (ACTV) shares surged 7.81 percent to $17.25 in post market trading. The company reported first quarter adjusted net loss of $10.7 million or $0.19 per share compared to $6.9 million or $0.16 per share in the same quarter and against analysts' estimation of loss of $0.31 per share.

Losers

TAL International Group, Inc. (TAL) shares plunged 4.91 percent to $39.48 in post market session. The company announced a public secondary offering of an aggregate of 5 million shares of common stock by certain selling stockholders of the Company, including affiliated funds of The Jordan Company, L.P., JZ Capital Partners Limited and Edgewater Growth Capital Partners, L.P.

Proto Labs, Inc. (PRLB) shares plunged 4.60 percent to $28.12 in aftermarket session. The company reported first quarter net income of $4.78 million or $0.22 per share, up from $2.43 million or $0.19 per share in the same period last year.

Northstar Realty Finance Corp. (NRF) stock plunged 4.21 percent to $5.69 in post market session. The company announced that it has commenced an underwritten public offering of 20,000,000 shares of common stock.

InvenSense, Inc. (INVN) shares declined 3.10 percent to $16.23 in post market session. The company reported fourth quarter net income of $0.07 per share in line with analysts' polled by Reuters estimation of $0.07 per share.

Assisted Living Concepts Inc. (ALC) shares declined 3.01 percent to $18.59 in post market session. The company announced that it would delay its previously announced May 3, 2012 earnings release and conference call discussion regarding its 2012 first quarter financial results.