Which insiders are selling and buying chunks of stocks?

Below are lists of the top 10 open-market insider purchases and sales filed at the Securities and Exchange Commission Thursday as ranked by dollar value. Company executives and directors are in the best position to assess the attractiveness of their firms' shares, and here is how many of them are voting their wallets! Please note, however, that these are factual lists, not buy and sell recommendations. Dollar value is only one metric to assess the importance of an insider transaction.

For the most up-to-date insider data, and fundamentally researched investment ideas inspired by insiders, check out www.InsiderInsights.com.

Valeant Pharmaceuticals (VRX) Valueact Holdings LP BO 150,000 $3,493,500 Greenbrier Companies (GBX) Furman William A CEO,PR, DIR 10,000 $77,883 Rockwell Medical Technologies (RMTI) Hagelstein David A BO 9,500 $72,485 Famous Daves Of America (DAVE) Monfort Richard L DIR 5,700 $33,558 Holloman Energy (HENC) Prim Eric C DIR 50,000 $26,262 Empire Petroleum (EMPR) Hackett Montague H Jr DIR 400,000 $20,000 Great Southern Bancorp (GSBC) Mitchem Steven G VP 435 $8,674 Premier Exhibitions (PRXI) Jacobs Jack H DIR 5,000 $3,500 Great Southern Bancorp (GSBC) Barclay William E DIR 129 $2,573 Ameritrans Capital (AMTC) Feinsod Michael CEO,PR, DIR,BO 2,000 $2,460

Calpine (CPN) Harbinger Capital Special Situations Fd BO 1,000,000 $10,320,000 Tekelec (TKLC) Natinco S A BO 250,000 $4,310,365 Berkshire Hathaway (BRK) Bill & Melinda Gates Foundation Trust BO 1,340 $3,832,997 Lumber Liquidators (LL) TA Associates Inc DIR 170,000 $2,861,620 Synnex (SNX) Miau Matthew DIR 90,500 $2,543,707 Knology (KNOL) Farallon Capital Management LLC BO,BO 209,000 $1,590,160 Neurogesx (NGSX) Flynn James E BO,BO 250,152 $1,493,407 Successfactors (SFSF) Dunn Eric DIR 148,458 $1,336,663 Dyncorp International (DCP) Div Holding LLC BO 60,500 $1,192,145 Hittite Microwave (HITT) Ayasli Yalcin BO 30,000 $1,049,340 Coldwater Creek (CWTR) Pence Dennis C DIR,BO 186,900 $1,001,298