President James Truchard Sells $7.7M National Instruments

NEW YORK (TheStreet) -- 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 Friday 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.

Facet Biotech (FACT) Bvf Partners L P Il BO 271,600 $4,261,930 Boulder Growth Inc Fund (BIF) Ernest Horejsi Trust No 1b BO 91,540 $548,033 Verizon Communications (VZ) Mcadam Lowell C CEO,PR,VP 15,000 $438,835 Rural Metro Corp (RURL) Falck Danmark A S BO 52,400 $288,200 Taylor Capital Group (TAYC) Second Curve Capital LLC BO 30,000 $279,000 Lodgenet Interactive (LNET) Black Horse Capital Mgt LLC BO 41,292 $229,785 Privatebancorp (PVTB) Hague Bruce R PR 10,000 $131,364 Clayton Williams Energy (CWEI) Williams Children S Partnership BO 2,970 $99,627 Ladenburg Thalmann Finl (LTS) Frost Phillip Md Et Al DIR,BO 100,000 $75,206 Valley National Bancorp (VLY) Edelstein Eric P DIR 4,000 $56,269

National Instruments (NATI) Truchard James J PR, DIR, BO 255,656 $7,658,476 Devry (DV) Keller Dennis J BO 100,000 $6,000,080 Berkshire Hathaway (BRK.B) Bill Melinda Gates Foundation BO 69,000 $5,027,802 Jefferies Group (JEF) Feller Lloyd H VP,GC,SEC 140,793 $3,808,394 IAC Interactivecorp (IACI) Liberty Media Corp BO 151,000 $3,068,320 Georesources (GEOI) Chandler Collis Paul III DIR,VP 150,000 $1,957,500 Devry (DV) Taylor Ronald L DIR 30,000 $1,801,299 Unitrin (UTR) Singleton Group LLC BO 64,600 $1,418,616 Prospect Medical (PZZ) Lee Samuel Sang Bum CEO,DIR,BO 206,550 $1,141,324 Medivation (MDVN) Bailey Gregory DIR 20,000 $667,000

Key to Titles: A=Assistant, AI=Affiliated Investor, AO=Accounting Officer, BD=Business Development, BO=Beneficial Owner, CAO=Chief Accounting Officer, CB=Chairman, CCO=Chief Compliance Officer, CEO=Chief Executive Officer, CFO=Chief Financial Officer, CIO=Chief Information Officer, CO=Compliance Officer, COO=Chief Operating Officer, CT=Controller, CTO=Chief Technology Officer, DIR=Director, F=Founder, FO=Financial Officer, GC=General Counsel, HR=Human Resources, IO=Information Officer, IR=Investor Relations, LO=Legal Officer, MD=Managing Director, O=Officer, OO=Operating Officer, PR=President, PT=Partner, REL=Relative of an insider, SEC=Secretary, SH=Shareholder, SO=Sales Officer, TO=Technology Officer, TR=Treasurer, TT=Trustee, VCB=Vice Chairman, VP=Vice President, X=Ex Officer or other title displayed.

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