Form 13f Cover Page (13f-nt)

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

Form 13F

Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: December 31, 2012

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: Tokio Marine Holdings, Inc. Address: Tokio Marine Nichido Building Shinkan 1-2-1, Marunouchi Chiyoda-ku, Tokyo, Japan 100-0005

13F File Number: 028-14109

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: Takuya Morimoto Title: Deputy Manager Phone: [phone]

Signature, Place, and Date of Signing:

/s/ Takuya Morimoto Tokyo, Japan January 23, 2013 Tokio Marine Asset Management Co., Ltd. ("TMA Tokyo") is a direct wholly-owned subsidiary of Tokio Marine & Nichido Fire Insurance Co., Ltd. and an indirect wholly-owned subsidiary of Tokio Marine Holdings, Inc.("TMHD"). As a result of the corporate relationship between TMHD and TMA Tokyo, TMHD is deemed to share investment discretion with TMA Tokyo with respect to Section 13(f) securities over which TMA Tokyo exercises investment discretion.

Report Type (Check only one.):

[ ] 13F HOLDINGS REPORT.

[ X] 13F NOTICE.

[ ] 13F COMBINATION REPORT.

List of Other Managers Reporting for this Manager:

Form 13F File Number Name

028-14025 Tokio Marine Asset Management Co,. Ltd