American Capital Strategies Ltd.

Philip R. Harper, director, bought 7,000 shares at $23.63 each on March 13 and now holds 152,941.

AES Corp.

Richard G. Darman, director, bought 75,000 shares between $2.95 and $3.20 each from March 10 to March 12 and now holds 235,000.

Allied Capital Corp.

Robert D. Long, officer, bought 1,000 shares between $19.73 and $19.75 each on March 12 and now holds 14,246.

Anteon International Corp.

Thomas M. Cogburn, officer, sold 2,000 shares between $20 and $20.04 each on March 17 and now holds 478,089.

Gilbert Felton Decker, director, sold 3,000 shares at $21.85 each on March 11 and now holds 37,320.

Capital Automotive REIT

David S. Kay, chief financial officer, sold 20,000 shares at $24.44 each from March 14 to March 17 and now holds 74,348.

Peter C. Staaf, officer and treasurer, sold 70,000 shares at $24.45 each on March 17 and now holds 84,737.

Choice Hotels International Inc.

Barbara Bainum, director and owner, sold 126,000 shares at $24.50 each on March 10 and now holds 2,296,310.

Roberta Bainum, beneficial owner of more than 10 percent, sold 126,000 shares at $24.50 each on March 10 and now holds 2,576,970.

Stewart W. Bainum, beneficial owner of more than 10 percent, sold 248,000 shares at $24.50 each on March 10 and now holds 5,097,290.

Thomas Mirgon, officer, sold 10,546 shares at $24.07 each on March 17 and now holds 20,156.

Criimi Mae Inc.

Harvey W. Willoughby, president, sold 2,256 shares at $9.80 each on Feb. 10 and now holds 334,069.

Cysive Inc.

R. Eugene Willingham, officer, sold 14,110 shares at $2.42 each on March 11 and now holds 361,000.

Corporate Executive Board Co.

Thomas L. Monahan III, officer and director, sold 35,000 shares at $32.25 each on March 5 and now holds 316.

Derek CM van Bever, officer, sold 34,250 shares at $32.25 each on March 5 and now holds 7,101.

FTI Consulting Inc.

Denis J. Callaghan, director, sold 30,000 shares at $42.77 each on March 14 and now holds 8,550.

Jack B. Dunn, chief executive, sold 75,000 shares at $42.84 each on March 14 and now holds 119,065.

Stewart J. Kahn, president, sold 50,000 shares at $42.92 each on March 14 and now holds 52,741.

Federal Realty Investment Trust

Joseph S. Vassalluzzo, director, bought 4,000 shares at $29.45 each on March 12 and now holds 4,000.

GTSI Corp.

Dendy M. Young, chief executive, bought 6,000 shares between $6.57 and $8.25 each from March 7 to March 14 and now holds 183,630.

Landamerica Financial Group Inc.

Russell W. Jordan III, general counsel, sold 3,262 shares at $36.13 each on March 12 and now holds 10,142.

Legg Mason Inc.

Harry M. Ford Jr., director, sold 1,347 shares at $49.36 each on March 18 and now holds 115,420.

Mid Atlantic Medical Services Inc.

John Derosa, officer, sold 13,000 shares at $37.17 each on March 7 and now holds no shares.

Ivan R. Sabel, director, sold 5,000 shares between $36.40 and $36.52 each on March 11 and now holds 15,000.

Nextel Communications Inc.

William E. Conway Jr., director, bought 100,000 shares at $11.35 each on March 12 and now holds 712,433.

Provident Bankshares Corp.

Gary N. Geisel, president, bought 500 shares at $23.29 each on March 13 and now holds 12,704.

Safenet Inc.

Michael M. Kaplan, chief technology officer, sold 10,000 shares at $19.10 each on March 14 and now holds 81,091.

Cornerstone Realty Income Trust Inc.

Debra A. Jones, chief operating officer, bought 500 shares at $7.21 each on March 10 and now holds 233,081.

Town & Country Trust

Nancy Beck, director, sold 7,500 shares at $20.06 each on March 14 and now holds no shares.

Trex Co.

Andrew U. Ferrari, officer, director and beneficial owner, sold 5,000 shares between $29.90 and $30.72 each from March 10 to March 14 and now holds 1,617,340.

Robert G. Matheny, president, sold 7,250 shares between $29.81 and $30.72 each from March 10 to March 14 and now holds 1,630,050.

United Therapeutics Corp.

Martine A. Rothblatt, chief executive, sold 5,000 shares at $16.20 each on March 13 and now holds 1,062,370.

Versar Inc.

Michael Markels Jr., director and owner, sold 1,000 shares at $2.50 each on March 12 and now holds 837,118.

The Washington Post Co.

A family trust for which Donald E. Graham, chairman and chief executive, is a trustee sold 675 shares at $690.46 each on March 17. Graham sold no personal shares.

-- Thompson Financial