January 19, 2007 - SC 13G/A: Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities by passive investors and certain institutions | MFA Financial, Inc. (MFA)

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Schedule 13G

Under the Securities Exchange Act of 1934
(Amend)

MFA MORTGAGE INVESTMENTS INC
(Name of Issuer)

INVESTMENT TRUST
(Title of Class of Securities)

55272X102
(CUSIP Number)

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)

*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class
of securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior page.

The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).

CUSIP No. 55272X102
---------

- ------------------------------------------------------------------------------
(1) Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS GLOBAL INVESTORS, NA., 943112180
- ------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a) / /
(b) /X/
- ------------------------------------------------------------------------------
(3) SEC Use Only

- ------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
U.S.A.
- ------------------------------------------------------------------------------
Number of Shares (5) Sole Voting Power
Beneficially Owned 1,567,363
by Each Reporting ------------------------------
Person With (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power
1,854,277
------------------------------
(8) Shared Dispositive Power
-
- ------------------------------------------------------------------------------
(9) Aggregate Amount Beneficially Owned by Each Reporting Person
1,854,277
- ------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- ------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
2.34%
- ------------------------------------------------------------------------------
(12) Type of Reporting Person*
BK
- ------------------------------------------------------------------------------

CUSIP No. 55272X102
---------

- ------------------------------------------------------------------------------
(1) Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS GLOBAL FUND ADVISORS
- ------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a) / /
(b) /X/
- ------------------------------------------------------------------------------
(3) SEC Use Only

- ------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
U.S.A.
- ------------------------------------------------------------------------------
Number of Shares (5) Sole Voting Power
Beneficially Owned 1,306,832
by Each Reporting ------------------------------
Person With (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power
1,306,832
------------------------------
(8) Shared Dispositive Power
-
- ------------------------------------------------------------------------------
(9) Aggregate Amount Beneficially Owned by Each Reporting Person
1,306,832
- ------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- ------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
1.65%
- ------------------------------------------------------------------------------
(12) Type of Reporting Person*
IA
- ------------------------------------------------------------------------------

CUSIP No. 55272X102
---------

- ------------------------------------------------------------------------------
(1) Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS GLOBAL INVESTORS, LTD
- ------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a) / /
(b) /X/
- ------------------------------------------------------------------------------
(3) SEC Use Only

- ------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
England
- ------------------------------------------------------------------------------
Number of Shares (5) Sole Voting Power
Beneficially Owned -
by Each Reporting ------------------------------
Person With (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power
-
------------------------------
(8) Shared Dispositive Power
-
- ------------------------------------------------------------------------------
(9) Aggregate
-
- ------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- ------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
- ------------------------------------------------------------------------------
(12) Type of Reporting Person*
BK
- ------------------------------------------------------------------------------

CUSIP No. 55272X102
---------

- ------------------------------------------------------------------------------
(1) Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS GLOBAL INVESTORS JAPAN TRUST AND BANKING COMPANY LIMITED
- ------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a) / /
(b) /X/
- ------------------------------------------------------------------------------
(3) SEC Use Only

- ------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
Japan
- ------------------------------------------------------------------------------
Number of Shares (5) Sole Voting Power
Beneficially Owned -
by Each Reporting ------------------------------
Person With (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power
-
------------------------------
(8) Shared Dispositive Power
-
- ------------------------------------------------------------------------------
(9) Aggregate
-
- ------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- ------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
- ------------------------------------------------------------------------------
(12) Type of Reporting Person*
BK
- ------------------------------------------------------------------------------

CUSIP No. 55272X102
---------

- ------------------------------------------------------------------------------
(1) Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).

BARCLAYS GLOBAL INVESTORS JAPAN LIMITED
- ------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a Group*
(a) / /
(b) /X/
- ------------------------------------------------------------------------------
(3) SEC Use Only

- ------------------------------------------------------------------------------
(4) Citizenship or Place of Organization
Japan
- ------------------------------------------------------------------------------
Number of Shares (5) Sole Voting Power
Beneficially Owned -
by Each Reporting ------------------------------
Person With (6) Shared Voting Power
-
------------------------------
(7) Sole Dispositive Power
-
------------------------------
(8) Shared Dispositive Power
-
- ------------------------------------------------------------------------------
(9) Aggregate
-
- ------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*

- ------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
0.00%
- ------------------------------------------------------------------------------
(12) Type of Reporting Person*
IA
- ------------------------------------------------------------------------------

ITEM 1(A). NAME OF ISSUER
MFA MORTGAGE INVESTMENTS INC
- ------------------------------------------------------------------------------
ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
350 PARK AVE 21ST FLOOR
NEW YORK NY 10022
- ------------------------------------------------------------------------------
ITEM 2(A). NAME OF PERSON(S) FILING
BARCLAYS GLOBAL INVESTORS, NA
- ------------------------------------------------------------------------------
ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
45 Fremont Street
San Francisco, CA 94105
- ------------------------------------------------------------------------------
ITEM 2(C). CITIZENSHIP
U.S.A
- ------------------------------------------------------------------------------
ITEM 2(D). TITLE OF CLASS OF SECURITIES
INVESTMENT TRUST
- ------------------------------------------------------------------------------
ITEM 2(E). CUSIP NUMBER
55272X102
- ------------------------------------------------------------------------------
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B),
OR 13D-2(B), CHECK WHETHER THE PERSON FILING IS A
(a) // Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) /X/ 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 section 240.13d(b)(1)(ii)(E).
(f) // Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) // 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
(15U.S.C. 80a-3).
(j) // Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A). NAME OF ISSUER
MFA MORTGAGE INVESTMENTS INC
- ------------------------------------------------------------------------------
ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
350 PARK AVE 21ST FLOOR
NEW YORK NY 10022
- ------------------------------------------------------------------------------
ITEM 2(A). NAME OF PERSON(S) FILING
BARCLAYS GLOBAL FUND ADVISORS
- ------------------------------------------------------------------------------
ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
45 Fremont Street
San Francisco, CA 94105
- ------------------------------------------------------------------------------
ITEM 2(C). CITIZENSHIP
U.S.A
- ------------------------------------------------------------------------------
ITEM 2(D). TITLE OF CLASS OF SECURITIES
INVESTMENT TRUST
- ------------------------------------------------------------------------------
ITEM 2(E). CUSIP NUMBER
55272X102
- ------------------------------------------------------------------------------
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B),
OR 13D-2(B), 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) /X/ Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) // Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) // 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
(15U.S.C. 80a-3).
(j) // Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A). NAME OF ISSUER
MFA MORTGAGE INVESTMENTS INC
- ------------------------------------------------------------------------------
ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
350 PARK AVE 21ST FLOOR
NEW YORK NY 10022
- ------------------------------------------------------------------------------
ITEM 2(A). NAME OF PERSON(S) FILING
BARCLAYS GLOBAL INVESTORS, LTD
- ------------------------------------------------------------------------------
ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
Murray House
1 Royal Mint Court
LONDON, EC3N 4HH
- ------------------------------------------------------------------------------
ITEM 2(C). CITIZENSHIP
England
- ------------------------------------------------------------------------------
ITEM 2(D). TITLE OF CLASS OF SECURITIES
INVESTMENT TRUST
- ------------------------------------------------------------------------------
ITEM 2(E). CUSIP NUMBER
55272X102
- ------------------------------------------------------------------------------
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B),
OR 13D-2(B), CHECK WHETHER THE PERSON FILING IS A
(a) // Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) /X/ 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 section 240.13d(b)(1)(ii)(E).
(f) // Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) // 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
(15U.S.C. 80a-3).
(j) // Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A). NAME OF ISSUER
MFA MORTGAGE INVESTMENTS INC
- ------------------------------------------------------------------------------
ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
350 PARK AVE 21ST FLOOR
NEW YORK NY 10022
- ------------------------------------------------------------------------------
ITEM 2(A). NAME OF PERSON(S) FILING
BARCLAYS GLOBAL INVESTORS JAPAN TRUST AND BANKING COMPANY LIMITED
- ------------------------------------------------------------------------------
ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
Ebisu Prime Square Tower 8th Floor
1-1-39 Hiroo Shibuya-Ku
Tokyo 150-0012 Japan
- ------------------------------------------------------------------------------
ITEM 2(C). CITIZENSHIP
Japan
- ------------------------------------------------------------------------------
ITEM 2(D). TITLE OF CLASS OF SECURITIES
INVESTMENT TRUST
- ------------------------------------------------------------------------------
ITEM 2(E). CUSIP NUMBER
55272X102
- ------------------------------------------------------------------------------
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B),
OR 13D-2(B), CHECK WHETHER THE PERSON FILING IS A
(a) // Broker or Dealer registered under Section 15 of the Act
(15 U.S.C. 78o).
(b) /X/ 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 section 240.13d(b)(1)(ii)(E).
(f) // Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) // 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
(15U.S.C. 80a-3).
(j) // Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 1(A). NAME OF ISSUER
MFA MORTGAGE INVESTMENTS INC
- ------------------------------------------------------------------------------
ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES
350 PARK AVE 21ST FLOOR
NEW YORK NY 10022
- ------------------------------------------------------------------------------
ITEM 2(A). NAME OF PERSON(S) FILING
BARCLAYS GLOBAL INVESTORS JAPAN LIMITED
- ------------------------------------------------------------------------------
ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE
Ebisu Prime Square Tower 8th Floor
1-1-39 Hiroo Shibuya-Ku
Tokyo 150-8402 Japan
- ------------------------------------------------------------------------------
ITEM 2(C). CITIZENSHIP
Japan
- ------------------------------------------------------------------------------
ITEM 2(D). TITLE OF CLASS OF SECURITIES
INVESTMENT TRUST
- ------------------------------------------------------------------------------
ITEM 2(E). CUSIP NUMBER
55272X102
- ------------------------------------------------------------------------------
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B),
OR 13D-2(B), 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) /X/ Investment Adviser in accordance with section 240.13d(b)(1)(ii)(E).
(f) // Employee Benefit Plan or endowment fund in accordance with section
240.13d-1(b)(1)(ii)(F).
(g) // 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
(15U.S.C. 80a-3).
(j) // Group, in accordance with section 240.13d-1(b)(1)(ii)(J)

ITEM 4. OWNERSHIP

Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

(a) Amount Beneficially Owned:
3,161,109
- ------------------------------------------------------------------------------

(b) Percent of Class:
3.99%
- ------------------------------------------------------------------------------

(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
2,874,195
----------------------------------------------------------------
(ii) shared power to vote or to direct the vote
-
----------------------------------------------------------------
(iii) sole power to dispose or to direct the disposition of
3,161,109
----------------------------------------------------------------
(iv) shared power to dispose or to direct the disposition of
-
----------------------------------------------------------------
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. /X/
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
The shares reported are held by the company in trust accounts for the
economic benefit of the beneficiaries of those accounts. See also
Items 2(a) above.
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

(a) The following certification shall be included if the statement
is filed pursuant to section 240.13d-1(b):

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.

(b) The following certification shall be included if the statement
is filed pursuant to section 240.13d-1(c):

By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above 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 of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

January 9, 2007
---------------------------------------
Date

---------------------------------------
Signature

Robert J. Kamai
Principal
---------------------------------------
Name/Title