Directors:
Martin Kahn (1) (2)
Chairman of the Board

Daniel J. Schimmel
President, Chief Executive Officer

David Dominik (1)
Consultant of Bain Capital, Inc.
Former Managing Director
of Bain Capital, Inc.
Director of Thermawave

Gregg S. Newmark (2)
General Partner of William Blair Venture Partners,
Principal of William Blair & Company, L.L.C.
Managing Director of William Blair Capital Partnersv

(1) Member of compensation committee.
(2) Member of audit committee.

Corporate Officers:
Daniel J. Schimmel
President, Chief Executive Officer

James A. Becker
Senior Vice President, Content Development

Philip J. Garlick
Senior Vice President, Global Sales

Mark C. VanDine
Senior Vice President, Engineering

Roy D. Landon
Senior Vice President, Chief Financial Officer

Mary McCabe
Senior Vice President, Product Development

Stockholder Information:
OneSource Information Services, Inc.'s common stock is traded on NASDAQ under the ticker symbol ONES.

Stockholder inquiries concerning the company may be addressed in writing to:

Treasurer
OneSource Information Services, Inc.
300 Baker Avenue
Concord, MA 01742
or by telephone at (978) 318-4300

Copies of the company's Form 10-K report (report to the Securities and Exchange Commission) are also available without charge from the Treasurer.

Transfer Agent:
American Stock Transfer
& Trust Company
40 Wall Street, 46th Floor
New York, New York 10005
(800) 937-5449

Annual Meeting:
The Annual Meeting of the Stockholders will be held:
Thursday, May 25, 2000
Testa, Hurwitz & Thibeault, LLP.
High Street Tower
125 High Street
Boston, MA 02110
The meeting will convene at 10:00 a.m.