UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form 13F

                               Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: March 31, 2006

Check here if Amendment [ ]; Amendment Number: ______

     This Amendment (Check only one.): [ ] is a restatement.

                                       [ ] adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:    Wesco Financial Insurance Company
Address: 3024 Harney St
         Omaha, NE 68131


Form 13F File Number: 28- 3091

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:  Mark D. Millard
Title: Assistant Secretary
Phone: 402-346-1400

Signature, Place, and Date of Signing:


(s) Mark D. Millard   Omaha, NE       May 12, 2006
- -------------------   [City, State]   [Date]
[Signature]

Report Type (Check only one.):

[ ]  13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager
     are reported in this report.)

[X]  13F NOTICE. (Check here if no holdings reported are in this report, and all
     holdings are reported by other reporting manager(s).)

[ ]  13F COMBINATION REPORT. (Check here if a portion of the holdings for this
     reporting manager are reported in this report and a portion are reported by
     other reporting manager(s).)

List of Other Managers Reporting for this Manager:



Form 13F File Number   Name
- --------------------   ----
                    
28-4545                Berkshire Hathaway Inc.