CUSIP No.   028740108

1

NAME OF REPORTING PERSON

Manulife Asset Management (US) LLC

2

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a)

o

(b)

o

N/A

3

SEC USE ONLY

4

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With

5

SOLE VOTING POWER

443,050

6

SHARED VOTING POWER

-0-

7

SOLE DISPOSITIVE POWER

443,050

8

SHARED DISPOSITIVE POWER

-0-

9

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

443,050

10

CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

N/A

11

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

5.87%

12

TYPE OF REPORTING PERSON*

IA

Item 1(a)

Name of Issuer:

American Pacific Corporation

Item 1(b)

Address of Issuer's Principal Executive Offices:

3883 Howard Hughes Parkway, Suite 700

Las Vegas, Nevada  89169

Item 2(a)

Name of Person Filing:

This filing is made on behalf of Manulife Financial Corporation (“MFC”) and MFC’s indirect, wholly-owned subsidiary, Manulife Asset Management (US) LLC (“MAM (US)”).

Item 2(b)

Address of Principal Business Office:

The principal business office of MFC is located at 200 Bloor Street East, Toronto, Ontario, Canada, M4W 1E5.

The principal business office of MAM (US) is located at 101 Huntington Avenue, Boston, Massachusetts 02199.

Item 2(c)

Citizenship:

MFC is organized and exists under the laws of Canada.

MAM (US) is organized and exists under the laws of the State of Delaware.

Item 2(d)

Title of Class of Securities:

Common Stock

Item 2(e)

CUSIP Number:

028740108

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:

MFC:

(g) (X)

a parent holding company or control person in

accordance with §240.13d-1(b)(1)(ii)(G).

MAM (US):

(e) (X)

an investment adviser in accordance with

§240.13d-1(b)(1)(ii)(E).

Item 4

Ownership:

(a)

Amount Beneficially Owned:  MAM (US) has beneficial ownership of 443,050 shares of Common Stock. Through its parent-subsidiary relationship to MAM (US), MFC may be deemed to have beneficial ownership of these same shares.

(b)

Percent of Class:  Of the 7,543,091 shares outstanding as of January 31, 2011, according to the issuer's Quarterly Report on Form 10-Q for the period ended December 31, 2010, MAM (US) held 5.87%.

(c)

Number of shares as to which the person has:

(i)

sole power to vote or to direct the vote:

MAM (US) has sole power to vote or to direct the voting of the shares of Common Stock it beneficially owns.

(ii)

shared power to vote or to direct the vote:  -0-

(iii)

sole power to dispose or to direct the disposition of:

MAM (US) has sole power to dispose or to direct the disposition of the shares of Common Stock it beneficially owns.

(iv)

shared power to dispose or to direct the disposition of:  -0-

Item 5

Ownership of Five Percent or Less of a Class:

Not applicable.

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 or Control Person:

See Items 3 and 4 above.

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 the undersigned certifies that, to the best of its 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.

Manulife Financial Corporation

By:

/s/ Kenneth G. Pogrin                                  

Name:

Kenneth G. Pogrin

Dated:  February 10, 2011

Title:

Attorney in Fact*

Manulife Asset Management (US) LLC

By:

/s/ William E. Corson                                 

Name:

William E. Corson

Dated:  February 10, 2011

Title:

Vice President and Chief Compliance Officer

Manulife Financial Corporation

By:

/s/ Kenneth G. Pogrin                                    

Name:

Kenneth G. Pogrin

Dated:  February 10, 2011

Title:

Attorney in Fact*

Manulife Asset Management (US) LLC

By:

/s/ William E. Corson                              

Name:

William E. Corson

Dated:  February 10, 2011

Title:

Vice President and Chief Compliance Officer