AES Corp.

Roger West Sant, director, sold 205,987 shares between $9.67 and $9.90 each from June 30 to July 1 and now holds 25,243,100.

Circuit City Stores Inc.

Ronald E. Baime, officer, sold 20,000 shares between $12.80 and $12.96 each from June 29 to June 30 and now holds 53,625.

CompuDyne Corp.

Martin A. Roenigk, chief executive, sold 5,000 shares between $11.55 and $11.70 each on June 30 and now holds 1,403,920.

Dollar Tree Stores Inc.

James E. Fothergill, officer, sold 4,500 shares at $27.24 each on July 1 and now holds 119.

Guilford Pharmaceuticals Inc.

Ronald M. Nordmann, director, bought 20,000 shares at $4.50 each on July 2 and now holds 25,000.

HealthExtras Inc.

Michael P. Donovan, chief financial officer, sold 5,000 shares between $16 and $16.80 each on July 1 and now holds 175,700.

Infodata Systems Inc.

Bruce A. Morton, officer, bought 2,451 shares at $1.53 each on July 1 and now holds 6,746.

Laura L. Sullivan, officer, bought 161 shares at $1.53 each on July 1 and now holds 645.

Norman F. Welsch, chief financial officer, bought 3,677 shares at $1.53 each on July 1 and now holds 24,446.

CarMax Inc.

Michael K. Dolan, officer, sold 16,400 shares at $21.45 each on June 30 and now holds 65,737.

William Spencer Kellogg, director, bought 25,000 shares at $21 each from July 1 to July 2 and now holds 57,417.

Joseph S. Kunkel, officer, sold 13,555 shares between $20.55 and $20.59 each on July 7 and now holds 25,859.

Legg Mason Inc.

Edward A. Taber III, officer, sold 15,000 shares at $91 each on June 29 and now holds 85,231.

Nextel Communications Inc.

Timothy M. Donahue, chief executive, sold 333,334 shares at $26.41 each on July 1 and now holds 1,420,630.

Online Resources Corp.

Raymond T. Crosier, president, bought 1,071 shares at $5.60 each on June 30 and now holds 78,438.

Portfolio Recovery Associates Inc.

Craig A. Grube, officer, sold 1,375 shares at $27.76 each on July 1 and now holds 142,979.

SteelCloud Inc.

Edward A. Burkhalter Jr., director, sold 12,500 shares at $2.73 each on July 1 and now holds 112,500.

Kevin Matthew Murphy, chief financial officer, sold 25,000 shares at $2.55 each on June 30 and now holds 37,245.

SRA International Inc.

Stephen C. Hughes, chief financial officer, sold 6,000 shares at $41.80 each on July 1 and now holds 6,109.

TeleCommunication Systems Inc.

Richard A. Young, chief operating officer, sold 15,000 shares between $6 and $6.10 each from July 1 to July 2 and sold 25,000 shares between $5.32 and $5.34 each from June 23 to June 30 and now holds 248,474.

Trex Co.

Anthony J. Cavanna, director and owner, sold 4,487 shares between $37.10 and $37.85 each on July 1 and now holds 1,617,270.

Robert G. Matheny, chief executive, sold 1,000 shares between $37.14 and $37.85 each on July 1 and now holds 1,335,300.

United Therapeutics Corp.

Fred T. Hadeed, chief financial officer, sold 1,944 shares at $25.44 each on July 1 and now holds 1,000.

Paul A. Mahon, general counsel, sold 2,000 shares at $25.44 each on July 1 and now holds 12,000.

Martine A. Rothblatt, chief executive, sold 2,000 shares at $24.55 each on July 1 and now holds 903,368.