4 1 NASD0001201940 Director F5 Networks, Inc. 104869591-1714307 03/10/03 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 4 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. 1. Name and Address of Reporting Person(s) Guelich, Karl D c/o F5 Networks, Inc. 401 Elliott Avenue West Seattle, WA 98119 2. Issuer Name and Ticker or Trading Symbol F5 Networks, Inc. (ffiv) 3. I.R.S. Identification Number of Reporting Person, if an entity (Voluntary) 4. Statement for Month/Day/Year 3/10/2003 5. If Amendment, Date of Original (Month/Day/Year) 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) [X] Director [ ] 10% Owner [ ] Officer (give title below) [ ] Other (specify below) Director 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 ------------------------------------------------------------------------------------------------------------------------------------ 1)Title of Security 2)Trans- 3.Trans- 4.Securities Acquired(A) 5)Amount of 6) 7)Nature of action action or Disposed of (D) Securities Indirect Date Code A Beneficially D Beneficial (Month/ or Owned at or Ownership Day/Year) Code V Amount D Price End of Month I ------------------------------------------------------------------------------------------------------------------------------------ Common Stock 03/10/03 S 440 (1) D $11.95 0 I by Partnership Table II (PART 1) Derivative Securities Acquired, Disposed of, or Beneficially Owned (Columns 1 through 6) ------------------------------------------------------------------------------------------------------------------------------------ 1)Title of Derivative 2)Conversion 3)Trans- 4)Trans- 5)Number of Derivative 6)Date Exercisable and Security or Exercise action action Securities Acquired (A) Expiration Date Price of Date Code or Disposed of (D) Derivative Security Code V A D Exercisable Expiration ------------------------------------------------------------------------------------------------------------------------------------ Table II (PART 2) Derivative Securities Acquired, Disposed of, or Beneficially Owned (Columns 1,3 and 7 through 11) ------------------------------------------------------------------------------------------------------------------------------------ 1)Title of Derivative 3)Trans- 7)Title and Amount 8)Price 9)Number of 10) 11)Nature of Security action of Underlying of Deri- Derivative Indirect Date Securities vative Securities D Beneficial Amount or Security Beneficially or Ownership Number of Owned at I - Title Shares End of Month ------------------------------------------------------------------------------------------------------------------------------------ Explanation of Responses: (1) Represents the reporting person's proportionate beneficial interest in shares held by a family partnership. The reporting person sha res dispositive power over shares held by the partnership with the other partners as per the partnership agreement. SIGNATURE OF REPORTING PERSON /S/ Guelich, Karl D DATE 03/11/03