Atlantic Coast Airlines Holdings Inc.

Robert Evans Buchanan, director, bought 5,000 shares between $5.53 and $5.55 each on May 19 and now holds 38,800.

AvalonBay Communities Inc.

Bruce Allen Choate, director, sold 10,000 shares at $52.07 each on May 20 and now holds 25,748.

Leo S. Horey III, officer, sold 8,550 shares at $53 each on May 24 and now holds 39,782.

Allan Denis Schuster, director, sold 15,366 shares at $52.36 each on May 19 and now holds 22,058.

Saul Centers Inc.

B. Francis Saul II, chief executive, bought 14,661 shares between $26.23 and $27.51 each from May 18 to May 21 and now holds 5,588,860.

CompuDyne Corp.

Martin A. Roenigk, chief executive, sold 5,000 shares at $8.76 each on May 20 and now holds 1,433,920.

Coventry Health Care Inc.

Thomas A. Davis, officer, sold 2,275 shares at $45.57 each on May 21 and now holds 57,128.

Harvey C. Demovick Jr., chief technology officer, sold 1,545 shares at $45.57 each on May 21 and now holds 92,306.

Shawn M. Guertin, officer, sold 1,665 shares at $45.57 each on May 21 and now holds 42,200.

Bernard J. Mansheim, officer, sold 2,261 shares at $45.57 each on May 21 and now holds 92,530.

James E. McGarry, officer, sold 2,261 shares at $45.57 each on May 21 and now holds 216,262.

John J. Ruhlmann, officer, sold 477 shares at $45.57 each on May 21 and now holds 15,967.

Francis S. Soistman Jr., officer, sold 3,046 shares at $45.57 each on May 21 and now holds 182,577.

Allen F. Wise, chief executive, sold 44,400 shares at $45.57 each on May 21 and now holds 580,151.

Dale B. Wolf, chief financial officer, sold 16,650 shares at $45.57 each on May 21 and now holds 805,558.

Digene Corp.

Attila T. Lorincz, officer, sold 10,000 shares at $40.02 each on May 24 and now holds 16,672.

Donna Marie Seyfried, officer, sold 10,000 shares between $40.03 and $40.10 each on May 24 and now holds 142,334.

Friedman Billings Ramsey Group Inc.

John T. Wall, director, bought 1,000 shares at $17.83 each on May 20 and now holds 15,285.

Fannie Mae

Ann McLaughlin Korologos, director, sold 186 shares at $69 each on May 18 and now holds 8,821.

Harman International Industries Inc.

Edwin Summers, general counsel, sold 1,000 shares at $73.50 each on May 19 and now holds 250.

Legg Mason Inc.

Edward A. Taber III, officer, sold 12,433 shares between $85.15 and $85.68 each from May 20 to May 24 and now holds 100,471.

Marriott International Inc.

Brendan M. Keegan, officer, sold 6,859 shares between $48.68 and $48.73 each on May 21 and now holds 0.

Stephen P. Weisz, officer, sold 11,939 shares between $48.65 and $48.94 each on May 24 and now holds 1,050.

Markel Corp.

Alan I. Kirshner, chief executive, sold 3,400 shares between $282 and $283.65 each from May 19 to May 21 and now holds 64,462.

Mercantile Bankshares Corp.

Deborah A. Kakaris, officer, sold 2,750 shares at $43.74 each on May 18 and now holds 327.

Online Resources Corp.

Matthew P. Lawlor, chief executive, bought 2,000 shares at $5.82 each on May 19 and now holds 1,448,890.

Provident Bankshares Corp.

Kevin G. Byrnes, president, bought 1,000 shares at $27.91 each on May 20 and now holds 3,000.

Pepco Holdings Inc.

Peter F. O' Malley, director, bought 8,172 shares at $17.44 each on May 24 and now holds 10,000.

Portfolio Recovery Associates Inc.

Steven D. Fredrickson, chief executive, sold 3,000 shares at $24.30 each on May 24 and now holds 446,385.

Rouse Co.

Duke Stephen Kassolis, officer, sold 13,000 shares between $41.50 and $42.50 each from May 20 to May 24 and now holds 120,639.

Sandy Spring Bancorp Inc.

John Chirtea, director, bought 200 shares at $34.67 each on May 19 and now holds 38,417.

SLM Corp.

Wolfgang Schoellkopf, director, sold 26,500 shares between $37.85 and $38.17 each on May 20 and now holds 50,000.

Barry Lawson Williams, director, sold 2,475 shares at $38.61 each on May 19 and now holds 21,095.

Spherix Inc.

Paul A. Cox Jr., director, bought 400 shares at $4.92 each on May 19 and now holds 400.

Sunrise Senior Living Inc.

Carl G. Adams, chief financial officer, sold 1,250 shares at $34.30 each on May 24 and now holds 12,584.

Larry E. Hulse, chief financial officer, sold 6,250 shares at $35 each on May 25 and now holds 23,059.

Thomas B. Newell, president, sold 12,000 shares at $34.20 each on May 21 and now holds 132,710.

Talk America Holdings Inc.

Mark S. Fowler, director, bought 5,000 shares at $7.85 each on May 17 and now holds 87,374.

Telecommunication Systems Inc.

Timothy James Lorello, officer, sold 9,000 shares between $5.15 and $5.38 each from May 18 to May 25 and now holds 397,276.

Trex Co.

Anthony J. Cavanna, director and owner, sold 4,487 shares between $34.80 and $35.11 each on May 19 and now holds 1,671,110.

Andrew U. Ferrari, director, sold 13,600 shares between $34.63 and $35.98 each from May 19 to May 25 and now holds 1,023,680.

Robert G. Matheny, chief executive, sold 1,000 shares at $36 each on May 25 and now holds 1,347,300.

United Therapeutics Corp.

Fred T. Hadeed, chief financial officer, sold 1,944 shares at $22.69 each on May 20 and now holds 1,000.

Roger Jeffs, president, sold 3,500 shares at $22.94 each on May 20 and now holds 14,012.

Paul A. Mahon, general counsel, sold 2,000 shares at $23.17 each on May 20 and now holds 12,000.

Martine A. Rothblatt, chief executive, sold 2,000 shares at $22.94 each on May 20 and now holds 924,368.

Universal Security Instruments Inc.

Michael L. Kovens, beneficial owner of more than 10 percent, sold 4,160 shares at $11.39 each on May 19 and now holds 339,930.

WebMethods Inc.

David Leon Mitchell, president, sold 10,000 shares at $8.16 each on May 19 and now holds 102,501.

-- Thomson Financial