SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Acme Packet Inc.

 

(Name of Issuer)

Common Stock

(Title of Class of Securities)

004764106

(CUSIP Number)

July 31, 2011

(Date of Event Which Requires Filing of this Statement)

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

     This Schedule is filed pursuant to Rule 13d-1(b)

The information required in the remainder of this cover page (except any items to which the form provides a cross-reference) 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.

 

 

CUSIP No.		004764106

CUSIP No.		004764106

CUSIP No.		004764106

1(a) Name of Issuer:		Acme Packet Inc.
1(b) Address of Issuer’s Principal		100 Crosby Drive
Executive Offices:		Bedford, MA 01730
2(a) Name of Person Filing:		(a) Ameriprise Financial, Inc. (“AFI”)
		(b) Columbia Management Investment
		Advisers, LLC (“CMIA”)
		(c) Columbia Select Large Cap Growth
		Fund(“SLCG”)
2(b) Address of Principal Business Office:		(a) Ameriprise Financial, Inc.
		145 Ameriprise Financial Center
		Minneapolis, MN 55474
		(b) 100 Federal St.
		Boston, MA 02110
		(c) 100 Federal St.
		Boston, MA 02110
2(c) Citizenship:		(a) Delaware
		(b) Massachusetts
		(c) Massachusetts
2(d) Title of Class of Securities:		Common Stock
2(e) Cusip Number:		004764106

3

Information if statement is filed pursuant to Rules 13d-1(b) or 13d-2(b):

(a)

Ameriprise Financial, Inc.

A parent holding company in accordance with Rule 13d-1(b)(1)(ii)(G). (Note: See Item 7)

(b)

Columbia Management Investment Advisers, LLC

An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E)

(c)

Columbia Select Large Cap Growth Fund

An investment company registered under Section 8 of the Investment Company Act of 1940.

4		Incorporated by reference to Items (5)-(9) and (11) of the cover page pertaining to each reporting person.
		CMIA, as an investment adviser to SLCG, may be deemed to beneficially own the shares reported herein by SLCG. Accordingly, the shares reported herein by CMIA include those shares separately reported herein by SLCG.

		AFI, as the parent company of CMIA, may be deemed to beneficially own the shares reported herein by CMIA. Accordingly, the shares reported herein by AFI include those shares separately reported herein by CMIA.
		Each of AFI and CMIA, and the subsidiaries identified on the attached Exhibit I, disclaims beneficial ownership of any shares reported on this Schedule.

5		Ownership of 5% or Less of a Class: Not Applicable
6		Ownership of more than 5% on Behalf of Another Person:
		The clients of Columbia Management Investment Advisers, LLC, a registered investment adviser, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends and proceeds from the sale of shares included on this Schedule. As of July 31, 2011, only SLCG, a registered investment company, owned more than 5% of the class of securities reported herein. Any remaining shares reported herein by CMIA are owned by various other accounts managed by CMIA on a discretionary basis. To the best of CMIA’s knowledge, none of these other accounts own more than 5% of the outstanding shares.
7		Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company:

AFI: See Exhibit I

8

Identification and Classification of Members of the Group:

Not Applicable

9

Notice of Dissolution of Group:

Not Applicable

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 purposes 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.

Dated: August 10, 2011
		Ameriprise Financial, Inc.
		By:		/s/ Wade M. Voigt    Name: Wade M. Voigt Title: Director — Fund Administration
		Columbia Management Investment Advisers, LLC
		By:		/s/ Amy Johnson    Name: Amy Johnson
				Title: Chief Operating Officer
		Columbia Funds Series Trust I, on behalf of its series Columbia Select Large Cap Growth Fund
		By:		/s/ Scott R. Plummer    Name: Scott R. Plummer
				Title: Senior Vice President, Secretary and Chief Legal Officer
		Contact Information
		Wade M. Voigt
		Director — Fund Administration
		Telephone: (612) 671-5682

Exhibit Index

Exhibit I		Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company.
Exhibit II		Joint Filing Agreement