Insider Transactions is a weekly report of stock transactions involving officers and directors of publicly owned local companies.

Stock trading by corporate insiders often is a bellwether of corporate health. Most insiders buy stock or exercise options to make a profit. And insiders may be selling stock for tax reasons, estate planning or cash needs.

The following insider transactions involving local companies were compiled by States News Service from reports to the Securities and Exchange Commission. ERC ENVIRONMENTAL AND ENERGY SERVICES CO.

Albert H. Spiers III, a vice president of ERC Environmental and Energy Services Co. of Fairfax, sold 4,000 common shares July 30 at $13 to $14 each and currently holds 2,000 shares directly.FASTCOMM COMMUNICATIONS CORP.

President Robert N. Dennis of Reston-based Fastcomm Communications Corp. sold 50,000 common shares at $1.13 to $1.28 each July 18 through July 30. Dennis presently controls 1,466,656 shares directly.HADRON INC.

Earl W. Brian, a director of Fairfax-based Hadron Inc., acquired 15,000 common shares July 3 at an undisclosed price. He controls 18,119 shares directly and 520,667 shares indirectly.HOLLYWOOD PARK REALTY ENTERPRISES INC.

Allen E. Paulson, a director of Lanham-based Hollywood Park Realty Enterprises Inc., purchased 45,000 common shares Aug. 6 through Aug. 7 at $30.50 to $31 each. His direct holding is 45,000 shares.JAMES MADISON LTD.

Henry H. Goldberg, a shareholder of James Madison Ltd. of Washington, privately purchased 5,000 common shares Aug. 16 at $5 each and now holds 234,865 shares directly.JEFFERSON BANKSHARES INC.

J.W. Price Jr., a shareholder of Jefferson Bankshares Inc. of Charlottesville, disposed of 54,749 common shares July 25 for an unreported amount and no longer holds any common stock. MARYLAND FEDERAL BANCORP INC.

George F. Brooks, an officer of a subsidiary of Maryland Federal Bancorp Inc. of Hyattsville, purchased 1,000 common shares Aug. 6 at $7.75 each. Brooks's direct holding is 3,351 shares.