Below are insider transactions of 1,000 shares or more...

INSIDER TRADING

March 27, 2000

Below are insider transactions of 1,000 shares or more for publicly held companies based in Maryland or having substantial operations here. Insiders are officers, directors or owners of 10 percent or more of a corporation's stock.

Bell Atlantic

Chester N. Watson, vice president, exercised an option for 11,460 shares of common at between $25.96 and $33 each from Feb. 2 to Feb. 3 and now directly and indirectly holds 17,526.

James H. Gilliam, director, exercised an option for 16,000 shares of common at between $25.03 and $55.75 each Feb. 14 and now directly and indirectly holds 27,399.

Rozanne L. Ridgway, director, exercised an option for 30,000 shares of common at between $25.03 and $34.13 each from Feb. 11 to Feb. 25 and sold 30,000 shares for between $48.38 and $55.94 each from Feb. 11 to Feb. 25. She now directly and indirectly holds 17,264.

Cel-Sci Corp.

Daniel H. Zimmerman, vice president, exercised an option for 24,000 shares of common at $3.12 each Feb. 17 and sold 24,000 shares for $9 each the same day and now directly holds 24,381.

Geert R. Kersten, chief executive officer-director, exercised an option for 50,750 shares of common at between $2.87 and $3.25 each from Feb. 10 to Feb. 16. To cover transaction expenses, Kersten turned in 15,000 of them and now directly and indirectly holds 148,598.

Maximilian Declara, president, exercised an option for 373,667 shares of common at between $2.94 and $3.25 each from Feb. 9 to Feb. 24 and sold 342,000 shares for between $5.45 and $9.50 each from Feb. 4 to Feb. 29 and now directly holds 31,667.

Patricia B. Prichep, vice president, exercised an option for 13,000 shares of common at between $2.38 and $3.25 each Feb. 10 and sold 10,000 shares for $9.25 each Feb. 17. She now directly holds 18,405.

Columbia Bancorp

Garnett V. Clark, director, purchased 5,232 shares of common at between $10.50 and $10.81 each from Feb. 9 to Feb. 10 and now directly holds 46,409.

General Motors

Charles H. Noski, officer of subsidiary company, sold 67,106 shares of Class H common for between $100.89 and $122.65 each from Feb. 7 to Feb. 25 and now directly and indirectly holds 43,466.

Eric A. Feldstein, vice president, exercised an option for 6,183 shares of common at between $40.07 and $45.30 each Feb. 3. To cover transaction expenses, Feldstein turned in 3,255 of them and now directly and indirectly holds 11,171.

Guy D. Briggs, vice president, exercised an option for 7,321 shares of common at $36.87 each Feb. 28 and sold 7,321 shares for $78.07 each Feb. 28 and now directly and indirectly holds 38,541.

John M. Losh, chief financial officer-vice president, sold 11,243 shares of common for $82.11 each Feb. 4 and now directly and indirectly holds 42,846.

John M. Losh, chief financial officer-vice president, sold 1,536 shares of Class H common for $110.90 each Feb. 4 and now directly and indirectly holds 11,051.

Michael T. Smith, officer of subsidiary company, exercised an option for 93,496 shares of Class H common at between $16.18 and $21.23 each Feb. 24 and sold 93,496 shares for between $114.84 and $117.65 each the same day. Smith now directly and indirectly holds 67,203 shares.

Robert W. Hendry, vice president, exercised an option for 2,492 shares of common at $40.07 each Feb. 14. To cover transaction expenses, Hendry turned in 1,348 of them and now directly and indirectly holds 26,525.

Ronald L. Zarrella, officer, exercised an option for 5,174 shares of common at between $28.62 and $46.59 each Feb. 29. To cover transaction expenses, Zarrella turned in 3,181 of them and now directly and indirectly holds 39,453.

Sandra L. Harrison, officer of subsidiary company, exercised an option for 31,330 shares of Class H common at between $21.23 and $35.41 each Feb. 24 and sold 31,330 shares for $120.51 each Feb. 24 . To cover transaction expenses, Harrison turned in 1,118 of them and now directly and indirectly holds 6,608 shares.

Thomas G. Stephens, vice president, sold 1,790 shares of common for $78.4 each Feb. 28. Stephens now directly and indirectly holds 6,626.

Thomas J. Davis, vice president, sold 2,800 shares of common for $78.25 each Feb. 29 and now directly and indirectly holds 13,714.

Tig H. Krekel, officer of subsidiary company, exercised an option for 12,000 shares of Class H common at $48.87 each Feb. 24 and sold 12,000 shares for $116 each the same day and now directly holds none.

Group 1 Software

Edward Weiss, officer, exercised an option for 3,000 shares of common at $6.61 each Feb. 20 and sold 2,000 shares for $25.61 each the same day. He now directly holds 1,000.

Honeywell Internat'l

James T. Porter, vice president, sold 25,000 shares of common for between $43.60 and $46.13 each from Feb. 14 to Feb. 15 and now directly and indirectly holds 30,488.

Peter M. Kreindler, vice president, exercised an option for 25,000 shares of common at $25.32 each Feb. 18 and sold 25,000 shares for $45.04 each the same day. He now directly and indirectly holds 12,827.

Legg Mason Inc.

Andrew M. Silton, vice president, exercised an option for 15,000 shares of common at $30.74 each Feb. 9 and sold 15,000 shares for $37.52 each Feb. 10 and now directly holds none.

Robert A. Frank, vice president, sold 62,500 shares of common for between $36.11 and $38.84 each from Feb. 2 to Feb. 29 and now directly and indirectly holds 90.

MedImmune Inc.

David M. Mott, chief financial officer-director, exercised an option for 183,506 shares of common at between $6.06 and $56.72 each from Feb. 22 to Feb. 28 and sold 183,506 shares for between $180.39 and $186.58 each from Feb. 22 to Feb. 28 and now directly holds 90,908.

Melvin D. Booth, chief operating officer-president, exercised an option for 100,000 shares of common at $33 each from Feb. 25 to Feb. 28 and sold 100,000 shares for between $182.54 and $183.45 each from Feb. 25 to Feb. 28 and now directly holds none.

Insider Trading is written by First Call/Thomson Financial of Rockville.

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