FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported): January 7, 2009

ACUSPHERE, INC.

(Exact Name of Registrant as Specified in Charter)

Delaware		000-50405		04-3208947
(State or Other Jurisdiction of Incorporation)		(Commission File Number)		(IRS Employer Identification No.)

500 Arsenal Street
Watertown, Massachusetts 02472

(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code (617) 648-8800

Not applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)

Item 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On January 7, 2009, Acusphere, Inc. (the “Company”) announced that it had received notification on January 7, 2009 from The Nasdaq Stock Market LLC (“NASDAQ”) stating that the Company’s common stock would be delisted from The Nasdaq Capital Market effective at the open of business on January 9, 2009 as a result of the Company’s failure to meet either the $2.5 million stockholders’ equity requirement for continued listing on The Nasdaq Capital Market or one of the alternative continued listing criteria.

The Company expects that its common stock will be eligible for trading on the Over-the-Counter Bulletin Board (the “OTCBB”), an electronic quotation service maintained by the Financial Industry Regulatory Authority, effective with the open of business on January 9, 2009. The Company’s shares are expected to continue to trade under the symbol ACUS.

Item 7.01 Regulation FD Disclosure.

On January 7, 2009, the Company issued a press release announcing that effective at the open of business on January 9, 2009, the Company’s common stock will be delisted from The Nasdaq Capital Market. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K.

This Item 7.01, including Exhibit 99.1 attached hereto, is intended to be furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.		Description

99.1		Press Release, dated January 7, 2009, of Acusphere, Inc. (furnished herewith)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	ACUSPHERE, INC.


Dated: January 7, 2009	By	/s/ Lawrence A. Gyenes
		Name:	Lawrence A. Gyenes
		Title:	Senior Vice President, Chief Financial
			Officer and Secretary

EXHIBIT INDEX

Exhibit No.		Description

99.1		Press Release, dated January 7, 2009, of Acusphere, Inc. (furnished herewith)

ACUSPHERE INC 8-K