Atlantic Coast Airlines Holdings Inc.

William Anthony Rice, director, bought 5,000 shares at between $6.40 and $6.41 each on May 5 and now holds 5,000.

American Capital Strategies Ltd.

Kenneth D. Peterson Jr., director, bought 13,000 shares at between $26.52 and $26.97 each from May 7 to May 10 and now holds 15,250.

Malon Wilkus, chief executive, bought 1,800 shares at $27.78 each on May 6 and now holds 1,066,550.

Allied Defense Group Inc.

James Henry Binford Peay III, director, bought 5,600 shares at $17.90 each on May 10 and now holds 37,031.

AES Corp.

Joseph C. Brandt, chief operating officer, bought 3,000 shares at $7.97 each on May 10 and now holds 19,520.

Amerigroup Corp.

Nancy L. Grden, officer, sold 1,955 shares at $43 each on May 4 and now holds 14,905.

Jeffrey L. McWaters, chief executive, sold 47,500 shares at between $42.99 and $43.01 each on May 4 and now holds 72,820.

Albemarle Corp.

George A. Newbill, officer, sold 18,000 shares at $29 each on May 5 and now holds 82,275.

Allied Capital Corp.

Laura W. Van Roijen, director, bought 452 shares at $24.13 each on May 4 and now holds 31,653.

AvalonBay Communities Inc.

Leo S. Horey III, officer, sold 10,000 shares at $51.50 each on May 5 and now holds 39,782.

Edward M. Schulman, general counsel, sold 3,307 shares at $50.41 each on May 11 and now holds 11,595.

Brink's Co.

James R. Barker, director, sold 1,401 shares at between $29.06 and $29.07 each on May 11 and now holds 1,258.

Saul Centers Inc.

Philip D. Caraci, director, bought 7,000 shares at between $24.70 and $25.31 each from May 7 to May 10 and now holds 130,757.

Cadmus Communications Corp.

Martina L. Bradford, director, bought 500 shares at $13.61 each on May 7 and now holds 2,100.

Choice Hotels International Inc.

Daniel K. Rothfeld, officer, sold 24,097 shares at between $46.44 and $46.55 each on May 5 and now holds 9,420.

Criimi Mae Inc.

Arthur N. Haut, director, bought 5,000 shares at between $10.65 and $10.75 each on May 11 and now holds 10,000.

Capital One Financial Corp.

Catherine G. West, officer, sold 18,000 shares at $65.40 each on May 7 and now holds 66,296.

Corvis Corp.

Joseph R. Hardiman, director, bought 10,000 shares at $1.47 each on May 7 and now holds 30,000.

Kim D. Larsen, officer, sold 275,000 shares at $1.56 each on May 5 and now holds 597,441.

Coventry Health Care Inc.

Bernard J. Mansheim, officer, sold 22,125 shares at $43.40 each on May 11 and now holds 94,791.

Digene Corp.

Donna Marie Seyfried, officer, sold 17,000 shares at between $39 and $39.50 each on May 6 and now holds 142,334.

Corporate Executive Board Co.

Michael A. Archer, officer, sold 37,500 shares at $50.11 each on May 7 and now holds 25,000.

Robert C. Hall, director, sold 32,240 shares at $50.11 each on May 7 and now holds 42,240.

David W. Kenny, director, sold 20,000 shares at $50.11 each on May 7 and now holds 0.

James J. McGonigle, chief executive, sold 232,796 shares at $50.11 each on May 7 and now holds 48,232.

Thomas L. Monahan III, officer and director, sold 37,610 shares at $50.11 each on May 7 and now holds 316.

Harold L. Siebert, director, sold 79,318 shares at $50.11 each on May 7 and now holds 19,114.

Derek C. M. Van Bever, officer, sold 49,931 shares at $50.11 each on May 7 and now holds 6,828.

Timothy R. Yost, chief financial officer, sold 34,500 shares at $50.11 each on May 7 and now holds 21,750.

HealthExtras Inc.

Kevin C. Hooks, officer, sold 350,857 shares at between $13.75 and $13.85 each from May 5 to May 6 and now holds 0.

Host Marriott Corp.

Richard E. Marriott, chairman, sold 600,000 shares at between $11.95 and $12.40 each from May 3 to May 5 and now holds 1,903,070.

Hilb, Rogal & Hobbs Co.

Theodore L. Chandler Jr., director, bought 35 shares at $36.16 each on May 3 and now holds 37,405.

William L. Chaufty, officer, sold 4,000 shares bat etween $36 and $36.01 each on May 7 and now holds 50,679.

Steven C. Deal, officer, sold 3,000 shares at $35.53 each on May 7 and now holds 44,780.

J.S.M. French, director, bought 107 shares at $36.16 each on May 3 and now holds 91,812.

Robert H. Hilb, director, bought 142 shares at between $36.08 and $36.16 each from May 3 to May 4 and now holds 162,206.

Julious P. Smith Jr., director, bought 35 shares at $36.16 each on May 3 and now holds 10,624.

Lafarge North America Inc.

Thomas Farrell, officer, sold 10,000 shares at $42.80 each on May 7 and now holds 22,539.

James M. Micali, director, bought 700 shares at $42.80 each on May 7 and now holds 700.

John D. Redfern, director, sold 3,268 shares at $42.86 each on May 7 and now holds 1,787.

Lockheed Martin Corp.

Frank H. Menaker Jr., general counsel, sold 11,090 shares at between $48.20 and $48.22 each on May 10 and now holds 30,982.

ManTech International Corp.

Michael D. Golden, director, sold 8,000 shares at $26.45 each on May 5 and now holds 5,319.

Kurt J. Snapper, officer, sold 20,000 shares at $26.19 each on May 4 and now holds 0.

Marriott International Inc.

John Willard Marriott Jr., chief executive, sold 212,659 shares at between $48.25 and $48.50 each on May 5 and now holds 22,940,900.

Richard E. Marriott, beneficial owner of more than 10 percent, sold 33,000 shares at between $48.25 and $48.37 each on May 5 and now holds 22,153,200.

MedImmune Inc.

Gordon S. Macklin, director, sold 105,000 shares at $24.26 each on May 6 and now holds 10,000.

MicroStrategy Inc.

Sanju K. Bansal, chief operating officer, sold 54,331 shares at between $43.20 and $47.81 each from May 6 to May 11 and now holds 50,000.

NII Holdings Inc.

Timothy M. Donahue, director, sold 9,000 shares at $35 each on May 11 and now holds 0.

Norfolk Southern Corp.

Henry C. Wolf, chief financial officer, sold 7,500 shares at $24 each on May 4 and now holds 165,962.

Owens & Minor Inc.

John T. Crotty, director, bought 1,100 shares at $24.13 each on May 11 and now holds 18,011.

Opnet Technologies Inc.

Alain J. Cohen, president, sold 11,500 shares at between $14.87 and $15.13 each from May 3 to May 4 and now holds 4,621,250.

Orbital Sciences Corp.

Ronald J. Grabe, officer, sold 1,800 shares at $13.30 each on May 4 and now holds 59,428.

David W. Thompson, chief executive, sold 10,000 shares at between $12.60 and $13.05 each from May 5 to May 6 and now holds 202,535.

Pepco Holdings Inc.

George F. MacCormack, director, bought 10,000 shares at $17.69 each on May 11 and now holds 11,282.

RGC Resources Inc.

Dale P. Moore, officer, bought 1 share at $23.99 on May 3 and now holds 657.

Rouse Co.

Anthony W. Deering, chief executive, sold 80,943 shares at between $40.45 and $41.70 each on May 10 and now holds 412,448.

Bruce W. Duncan, director, bought 10,000 shares at $40.32 each on May 10 and now holds 11,300.

Sylvan Learning Systems Inc.

John A. Miller, director, bought 5,000 shares at $37.09 each on May 3 and now holds 30,000.

Sunrise Senior Living Inc.

Pete A. Klisares, director, sold 16,665 shares at $34.98 each on May 7 and now holds 1,243.

Savvis Communications Corp.

John D. Clark, director and owner, sold 209,752 shares at $2.23 each on May 6 and now holds 3,190,650.

Tredegar Corp.

W. Hildebrandt Surgner Jr., officer, bought 100 shares at $13.10 each on May 7 and now holds 9,426.

Trex Co.

Anthony J. Cavanna, director and owner, sold 8,974 shares at between $37.54 and $39.39 each from May 3 to May 5 and sold 4,487 shares at between $35.30 and $36.30 each on May 11 and now holds 1,684,570.

Andrew U. Ferrari, director, sold 7,500 shares at between $37.51 and $38.55 each from May 5 to May 6 and now holds 1,044,930.

Robert G. Matheny, chief executive, sold 1,000 shares at $37.64 each on May 6 and now holds 1,349,300.

United Therapeutics Corp.

Roger Jeffs, president, sold 3,500 shares at $25.31 each on May 6 and now holds 14,012.

Paul A. Mahon, general counsel, sold 4,000 shares at $25.20 each on May 6 and now holds 12,000.

Martine A. Rothblatt, chief executive, sold 2,000 shares at $25.31 each on May 6 and now holds 931,368.

Xybernaut Corp.

Steven A. Newman, president, bought 5,000 shares at $1.12 each on May 12 and now holds 486,481.

-- Thomson Financial