AFG 13D


SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

--------------

SCHEDULE 13G
(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO 13d-1(b) AND (c) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b)




National Interstate Corporation
---------------------------------------------------
(Name of Issuer)


Common Stock, No Par Value
---------------------------------------------------
(Title of Class of Securities)


63654U 100
---------------------------------------------------
(CUSIP Number)


James C. Kennedy, Esq.
One East Fourth Street
Cincinnati, Ohio 45202
(513) 579-2538
---------------------------------------------------
(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)


December 31, 2006
---------------------------------------------------
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

   [ X ]  Rule 13d-1(b)
   [   ]  Rule 13d-1(c)
   [   ]  Rule 13d-1(d)


Page 1 of 5 Pages

 

CUSIP NO. 63654U 100

13G

Page 2 of 5 Pages
     

1

NAME OF REPORTING PERSONS

  
 

S.S. OR I.R.S. IDENTIFICATION, NOS. OF ABOVE PERSONS

  
     
 

American Financial Group, Inc.             31-1544320

  

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) [ ]
   

(b) [ ]
     

3

SEC USE ONLY

  
     

4

CITIZENSHIP OR PLACE OF ORGANIZATION

  
 

Ohio Corporation

  
     

5

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON

  
 

WITH:

  
     
 

SOLE VOTING POWER

  
     
 

10,200,000

  
     

6

SHARED VOTING POWER

  
     
 

- - -

  
     

7

SOLE DISPOSITIVE POWER SHARED VOTING POWER

  
     
 

10,200,000

  
     

8

SHARED DISPOSITIVE POWER

  
     
 

- - -

  
     

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING

  
 

PERSON

  
     
 

10,200,000

  
     

10

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)

  
 

EXCLUDES CERTAIN SHARES*

  
   

[ ]
     

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

  
     
 

53.2%

 
     

12

TYPE OF REPORTING PERSON*

  
     
 

CO

  
     

 

 

CUSIP NO. 63654U 100

13G

Page 3 of 5 Pages
     
     

Item 1(a)

Name of Issuer

  
     
 

National Interstate Corporation

  
     

Item 1(b)

Address of Issuer's Principal Executive Offices.

  
     
 

3250 Interstate Drive, Richfield, OH 44286

  
     

Item 2(a)

Names of Person Filing

  
     
 

American Financial Group, Inc.

  
     

Item 2(b)

Address of Principal Business Office, or if None, Residence

  
     
 

One East Fourth Street, Cincinnati, Ohio 45202

  
     

Item 2(c)

Citizenship

  
     
 

Ohio Corporation

  
     

Item 2(d)

Title of Class of Securities

  
     
 

Common Stock, no par value

  
     

Item 2(e)

Cusip Number

  
     
 

63654U 100

  
     

Item 3

If this statement is filed pursuant to Sections 240.13d-1(B) or 240.13d-2(b) or (c), check whether the person filing is a:

  
  (a)  [  ]  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)  [  ]  An investment adviser in accordance with Section 240.13d-

           1(b)(1)(ii)(e)

  
 

(f)  [  ]  An employee benefit plan or endowment fund in accordance
           with Section 240.13d-1(b)(1)(ii)(F)

  
 

(g)  [X ]  A parent holding company or control person in accordance
           with Section 240.13d-1(b)(1)(ii)(G)

  
 

(h)  [  ]  A savings association as defined in Section 3(b) of the
           Federal Deposit Insurance act (12 U.S.C. 1813)

  
 

(i)  [  ]  a church plan that is excluded from the definition of an
           investment company under section 3(c)(14) of the
           Investment Company Act of 1940 (15 U.S.C. 80a-3)

  
 

(j)  [  ]  Group, in accordance with Section 240.13d-1(b)(1)(ii)(J)

  

 

CUSIP NO. 63654U 100

13G

Page 4 of 5 Pages

 
     

Item 4

Ownership

  
     

(a)

Amount Beneficially Owned:

10,200,000

(b)

Percentage of Class:

53.2%

(c)

Number of shares as to which such person has:

  
 

(i)    Sole power to vote or direct the vote:

10,200,000
 

(ii)   Shared power to vote or direct the vote:

none
 

(iii)  Sole power to vote or direct the

 
 

disposition of:

10,200,000
 

(iv)   Shared power to dispose or direct the

 
 

disposition of:

none
     


 

Item 5. Ownership of Five Percent or Less of a Class

     If 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, check the following                                                                                         [  ]

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

     N/A


Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

     N/A.

Item 8. Identification and Classification of Member of the Group.

     N/A

Item 9. Notice of Dissolution of Group.


     N/A

Item 10. Certification.

     By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purpose or effect.

 

CUSIP NO. 63654U 100

13G

Page 5 of 5 Pages


     After reasonable inquiry and to the best knowledge and belief of the undersigned, it is hereby certified that the information set forth in this statement is true, complete and correct.

Dated:    January 24, 2007

 
 

AMERICAN FINANCIAL GROUP, INC.
   
 

By:   Karl J. Grafe
 

   -------------------------------
 

    Karl J. Grafe, Vice President