SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 -------------- SCHEDULE 13D/A (RULE 13D-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13D-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13D-2(a) (Amendment No.1) RADIOLOGIX INCORPORATED ----------------------------------------------------------------------- (Name of Issuer) COMMON STOCK, PAR VALUE $0.01 PER SHARE ----------------------------------------------------------------------- (Title of Class of Securities) 75040K109 ----------------------------------------------------------------------- (CUSIP Number) Marc Weingarten, Esq. SCHULTE, ROTH & ZABEL LLP 919 Third Avenue New York, New York 10022 (212) 756-2000 ----------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) March 3, 2003 ----------------------------------------------------------------------- (Date of Event Which Requires Filing of This Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box |_|. NOTE. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. SEE Rule 13d-7 for other parties to whom copies are to be sent. -------- * The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, SEE the NOTES). (page 1 of 5 pages) ---------------------------------- ------------------ CUSIP No. 75040K109 13D Page 2 of 5 Pages ---------------------------------- ------------------ ======================================================================= 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) JANA PARTNERS LLC ----------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) |_| (b) |_| ----------------------------------------------------------------------- 3 SEC USE ONLY ----------------------------------------------------------------------- 4 SOURCE OF FUNDS* WC ----------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e) |_| ----------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE ----------------------------------------------------------------------- NUMBER OF 7 SOLE VOTING POWER SHARES BENEFICIALLY 1,970,300 OWNED BY EACH REPORTING PERSON WITH -------------------------------------------------------- 8 SHARED VOTING POWER -0- -------------------------------------------------------- 9 SOLE DISPOSITIVE POWER 1,970,300 -------------------------------------------------------- 10 SHARED DISPOSITIVE POWER -0- ----------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,970,300 ----------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* |_| ----------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.14% ----------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* IA ============================================================================ SEE INSTRUCTIONS BEFORE FILLING OUT!* ---------------------------------- ------------------ CUSIP No. 75040K109 13D Page 3 of 5 Pages ---------------------------------- ------------------ The following constitutes Amendment #1 to the Schedule 13D filed by the undersigned (the "Schedule 13D"). Item 3. Source and Amount of Funds or Other Consideration. ------------------------------------------------- The aggregate purchase price of the 1,970,300 Shares of Common Stock owned beneficially by JANA Partners LLC is $ 5,053,968. Such Shares of Common Stock were acquired with investment funds in accounts under management. Item 5. Interest in Securities of the Issuer. ------------------------------------ (a) The aggregate percentage of Shares of Common Stock reported owned beneficially by the Reporting Person is based upon 21,567,153 Shares outstanding, which is the total number of Shares of Common Stock outstanding as reported in the Issuer's Quarterly Report on Form 10-Q for the quarter ended September 30, 2002. As of the close of business on March 3, 2003, JANA Partners LLC beneficially owned 1,970,300 Shares of Common Stock, constituting approximately 9.14% of the Shares outstanding. (b) The Reporting Person has sole voting and dispositive powers with respect to the Shares reported herein, which powers are exercised by the Principals. All of such Shares were acquired in open-market transactions. (c) Schedule A annexed hereto lists all transactions in the Issuer's Common Stock in the last sixty days by the Reporting Person. (d) No person other than the Reporting Person is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, such Shares of the Common Stock. (e) Not applicable. Item 7. Material to be Filed as Exhibits. -------------------------------- None. ---------------------------------- ------------------ CUSIP No. 75040K109 13D Page 4 of 5 Pages ---------------------------------- ------------------ SIGNATURES After reasonable inquiry and to the best of his knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct. Dated: March 4, 2003 JANA PARTNERS LLC By: /s/ Barry S. Rosenstein ------------------- Barry S. Rosenstein Managing Partner By: /s/ Gary Claar ------------------- Gary Claar Managing Director ---------------------------------- ------------------ CUSIP No. 75040K109 13D Page 5 of 5 Pages ---------------------------------- ------------------ SCHEDULE A Transactions in the Shares During the Past 60 Days -------------------------------------------------- Shares of Common Stock Price Per Date of Purchased (Sold) Share($) Purchase (Sale) ----------- --------- -------------- JANA PARTNERS LLC ----------------------- 4,600 2.1233 01/22/03 50,200 2.1897 01/23/03 18,000 2.1576 01/24/03 152,800 2.1620 01/27/03 92,200 2.1803 01/28/03 26,400 2.1599 01/29/03 11,300 2.1839 01/30/03 1,400 2.2000 01/31/03 69,300 2.3449 02/03/03 89,300 2.3996 02/04/03 42,300 2.4633 02/05/03 55,000 2.5233 02/06/03 20,000 2.5729 02/07/03 6,700 2.5321 02/10/03 23,000 2.6309 02/11/03 88,800 2.6700 02/12/03 20,000 2.5050 02/13/03 1,000 2.4900 02/14/03 11,900 2.7376 02/19/03 32,800 2.5988 02/24/03 31,000 2.4258 02/25/03 20,500 2.3622 02/26/03 65,000 2.4228 02/27/03 19,426 2.3961 02/28/03 17,000 2.4163 03/03/03