4/A 1 form4a_08-2002.txt U.S. SECURITIES AND EXCHANGE COMMISSION Washington, DC 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 [_] Check box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). ________________________________________________________________________________ 1. Name and Address of Reporting Person* Massey Richard J. -------------------------------------------------------------------------------- (Last) (First) (Middle) c/o IGEN International, Inc. 16020 Industrial Drive -------------------------------------------------------------------------------- (Street) Gaithersburg MD 20877 -------------------------------------------------------------------------------- (City) (State) (Zip) ________________________________________________________________________________ 2. Issuer Name and Ticker or Trading Symbol IGEN International, Inc. ________________________________________________________________________________ 3. IRS Identification Number of Reporting Person, if an Entity (Voluntary) ________________________________________________________________________________ 4. Statement for Month/Year August 2002 ________________________________________________________________________________ 5. If Amendment, Date of Original (Month/Year) August 2002 ________________________________________________________________________________ 6. Relationship of Reporting Person to Issuer (Check all applicable) [X] Director [_] 10% Owner [X] Officer (give title below) [_] Other (specify below) President & COO ________________________________________________________________________________ 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. (Print or Type Response) (Over) 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) Includes 3,200 shares of common stock that were issued under an early exercise feature in the Option granted to Dr. Massey, subject to a repurchase right in favor of the Company at the option exercise price in the event that the holder's employment with IGEN terminates prior to vesting. (2) Includes 15,200 shares of common stock that were issued under an early exercise feature in the option granted to Dr. Massey, subject to a repurchase right in favor of the Company at the option exercise price in the event that the holder's employment with IGEN terminates prior to vesting. (3) Incentive Stock Option granted under the Issuer's 1994 Stock Option Plan. Option vests 20% one year from the date of grant and then an additional 5% vest each quarter thereafter. (4) Option granted under the Issuer's 1994 Stock Option Plan. Option vests 20% one year from the date of grant and then an additional 5% vest each quarter thereafter. Includes grant of 2,637 shares issued under an Incentive Stock Option and grant of 47,363 shares issued under a Non- Qualified Stock Option. /s/ Richard J. Massey 8/23/02 --------------------------------------------- ----------------------- **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 procedure. Page 2

MASSEY RICHARD J 4/A