SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C.  20549
 
                   
 
SCHEDULE 13G
Final Amendment

(Rule 13d-102)

Information to be Included in Statements Filed Pursuant to § 240.13d-1(b), (c) and (d) and Amendments
Thereto Filed Pursuant to  § 240.13d-2.
 
Under the Securities Exchange Act of 1934


 ZENITH NATIONAL INSURANCE CORP .
(Name of Issuer)
 
         Common Stock         
(Title of Class of Securities)
 
         989390109        
(CUSIP Number)
 
                        February 28, 2010                      
(Date of Event Which Requires Filing of this Statement)
 
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
 
ý   Rule 13d-1(b)
¨   Rule 13d-1(c)
¨   Rule 13d-1(d)
 
                   
 
Page 1 of 6 Pages

 
 
 

SCHEDULE 13G
 
CUSIP No. 989390109                                                                         Page 2 of 6 Pages
 
1)
NAME OF REPORTING PERSON
Gilder, Gagnon, Howe & Co. LLC
 
2)
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a)        o
(b)        o
3)
SEC USE ONLY
 
 
4)
CITIZENSHIP OR PLACE OF ORGANIZATION
 
New York
 
NUMBER
OF
SHARES
BENEFICIALLY
OWNED BY
EACH
REPORTING
PERSON
WITH
5)
SOLE VOTING POWER
 
None
6)
SHARED VOTING POWER
 
None
7)
SOLE DISPOSITIVE POWER
 
None
8)
SHARED DISPOSITIVE POWER
 
110
9)
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
110
10)
CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
o
11)
PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
 
0.0%
12)
TYPE OF REPORTING PERSON
 
BD

 

 
 
 
 

Schedule 13G
 
Item 1(a).
Name of Issuer:
 
ZENITH NATIONAL INSURANCE CORP.
 
Item 1(b).               Address of Issuer’s Principal Executive Offices:
 
21255 Califa Street
Woodland Hills, CA 91367

Item 2(a).              Name of Person Filing:

Gilder, Gagnon, Howe & Co. LLC
 
Item 2(b).
Address of Principal Business Office or, if None, Residence:
 
1775 Broadway, 26th Floor
New York, NY  10019
 
Item 2(c).
Citizenship:
 
New York
 
Item 2(d).
Title of Class of Securities:
 
Common Stock
 
Item 2(e).
CUSIP Number:
 
989390109
 
Item 3.                    If this statement is filed pursuant to §§ 240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a:
 
 
(a)
x
Broker or Dealer Registered Under Section 15 of the Act (15 U.S.C. 78o)
 
 
(b)
¨
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c)
 
 
(c)
¨
Insurance Company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c)
 
 
(d)
¨
Investment Company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8)
 
 
(e)
¨
Investment Adviser in accordance with § 240.13d-1(b)(1)(ii)(E)
 
 
(f)
¨
Employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F)
 
 
(g)
¨
Parent Holding Company or control person in accordance with §240.13d-1(b)(ii)(G)
 
 
 
 
 
 
(h)
¨
Savings Association as defined in §3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813)
 
 
(i)
¨
Church plan that is excluded from the definition of an investment company under §3(c)(15) of the Investment Company Act of 1940 (15 U.S.C. 80a-3)
 
 
(j)
¨
Group, in accordance with §240.13d-1(b)(ii)(J)
 
Item 4.
Ownership.
 
 
(a)
Amount beneficially owned:  110
 
 
(b)
Percent of class:  0.0%
 
 
(c)
Number of shares as to which such person has:
 
 
(i)
Sole power to vote or to direct the vote:  None
 
 
(ii)
Shared power to vote or to direct the vote:  None
 
 
(iii)
Sole power to dispose or to direct the disposition of:  None
 
 
(iv)
Shared power to dispose or to direct the disposition of:  110
 
 
The shares reported include 30 shares held in customer accounts over which partners and/or employees of the Reporting Person have discretionary authority to dispose of or direct the disposition of the shares, and 80 shares held in accounts owned by the partners of the Reporting Person and their families.
 
Item 5.
Ownership of Five Percent or Less of a Class.
 
This statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities.
 
Item 6.
Ownership of More than Five Percent on Behalf of Another Person.

Not applicable
 
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.

Not applicable
 

 
 
 
 
 
 
 
Item 8.
Identification and Classification of Members of the Group.
 
Not applicable
 
Item 9.
Notice of Dissolution of Group.
 
Not applicable
 
Item 10.
Certification.
 
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.
 

 
 
 
 

SIGNATURE
 
After reasonable inquiry and to the best knowledge and belief of the undersigned, the undersigned certifies that the information set forth in this Statement is true, complete and correct.
 
 
March 8, 2010                                                                               
Date
 
/s/ Scott I. Noah                                                                          
Signature
 
Scott I. Noah, General Counsel & Chief Compliance Officer
Name/Title
 
 
 
 
 
 
 
 
 
 
 
 
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