4 1 horne1.txt STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP ------------------------------ OMB APPROVAL ------------------------------ OMB Number Expires: Estimated average burden hours per response ....... 0.5 ------------------------------ U.S. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940 [ X] Check this box if no longer subject of Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). ================================================================================ 1. Name and Address of Reporting Person* Horne Kathleen B. -------------------------------------------------------------------------------- (Last) (First) (Middle) c/o PSINet Inc. 44983 Knoll Square -------------------------------------------------------------------------------- (Street) Ashburn VA 20147 -------------------------------------------------------------------------------- (City) (State) (Zip) ================================================================================ 2. Issuer Name and Ticker or Trading Symbol PSINet Inc. ("PSIX") ================================================================================ 3. IRS or Social Security Number of Reporting Person (Voluntary) ================================================================================ 4. Statement for Month/Year December, 2001 ================================================================================ 5. If Amendment, Date of Original (Month/Year) ================================================================================ 6. Relationship of Reporting Person to Issuer (Check all applicable) [ ] Director [ ] 10% Owner [ X ] Officer (give title below) [ ] Other (specify below) Executive Vice President and General Counsel ================================================================================ 7. Individual or Joint/Group Filing (Check applicable line) [ X] Form filed by one Reporting Person [ ] Form filed by more than one Reporting Person ================================================================================ Table I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned ================================================================================

* If the Form is filed by more than one Reporting Person, see Instruction 4(b)(v). Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. Page 1 of 2 FORM 4 (continued) Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) ================================================================================

Explanation of Responses: (1) On the transaction dates indicated, the reporting person placed a request that the shares be transferred to the Issuer for cancellation without payment. The shares have not yet been canceled by the Issuer's transfer agent, although cancellation of the shares is expected to occur shortly. (2) Reflects shares held by Ms. Horne and her husband, William W. Horne, as joint tenants. /s/Kathleen B. Horne 01/10/02 --------------------------------------------- ----------------------- **Signature of Reporting Person Date ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedures. Alternatively, this Form is permitted to be submitted to the Commission in electronic format at the option of the reporting person pursuant to rule 101(b)(4) of Regulation S-T. Page 2 of 2

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