SECURITIES AND EXCHANGE COMMISSION

SCHEDULE TO
(Rule 14d-100)
Tender Offer Statement Under Section 14(d)(1)
or Section 13(e)(1) of the Securities Exchange Act of 1934

OneSource Information Services, Inc.

OSIS Acquisition Corp.

COMMON STOCK, PAR VALUE $.01 PER SHARE
(Title of Class of Securities)

68272J106
(CUSIP Number of Class of Securities)

Vinod Gupta
Chairman of the Board and
Chief Executive Officer
5711 South 86th Circle
Omaha, NE 68127
(402) 593-4500

(Name, address and telephone number of
person authorized to receive notices
and communications on behalf of filing persons)

With a copy to:

Eric O. Madson, Esq.
Robins, Kaplan, Miller & Ciresi L.L.P.
2800 LaSalle Plaza
800 LaSalle Avenue
Minneapolis, MN 55402-2015
(612) 349-8500

Calculation of Filing Fee

     o Check the box if any part of the fee is offset as provided by Rule 0-11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filings.

Amount Previously Paid: Not Applicable
Form or Registration No: Not Applicable
Filing Party: Not Applicable
Date Filed: Not Applicable

     x Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.

     Check the appropriate boxes below to designate any transactions to which the statement relates:

     x third-party tender offer subject to Rule 14d-1.

     o issuer tender offer subject to Rule 13e-4.

     o going-private transaction subject to Rule 13e-3.

     o amendment to Schedule 13D under Rule 13d-2.

     Check the following box if the filing is a final amendment reporting the results of the tender offer: o

Table of Contents

ITEMS 1-11, 13.

Not applicable.

ITEM 12. MATERIALS TO BE FILED AS EXHIBITS.

EXHIBIT INDEX