UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 6)1

Actel Corporation

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

004934105

(CUSIP Number)

MARK MITCHELL

RAMIUS LLC

599 Lexington Avenue, 20th Floor

New York, New York 10022

(212) 845-7988

STEVEN WOLOSKY, ESQ.

OLSHAN GRUNDMAN FROME ROSENZWEIG & WOLOSKY LLP

Park Avenue Tower

65 East 55th Street

New York, New York 10022

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

October 2, 2010

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7 for other parties to whom copies are to be sent.

_______________

1 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 disclosures provided in a prior cover page.

The information required on 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. 004934105

1	NAME OF REPORTING PERSON RAMIUS VALUE AND OPPORTUNITY MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,211,614
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,211,614
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,211,614
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.7%
14	TYPE OF REPORTING PERSON CO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RAMIUS OPTIMUM INVESTMENTS LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 31,947
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 31,947
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 31,947
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RCG PB, LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 943,515
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 943,515
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 943,515
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 3.6%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RAMIUS NAVIGATION MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 300,483
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 300,483
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 300,483
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.2%
14	TYPE OF REPORTING PERSON CO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RAMIUS ENTERPRISE MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 300,483
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 300,483
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 300,483
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.1%
14	TYPE OF REPORTING PERSON CO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RAMIUS ADVISORS, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,275,945
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,275,945
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,275,945
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.9%
14	TYPE OF REPORTING PERSON CO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RAMIUS VALUE AND OPPORTUNITY ADVISORS LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,211,614
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,211,614
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,211,614
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 4.7%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RAMIUS LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,487,559
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,487,559
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON COWEN GROUP, INC.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,487,559
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,487,559
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON CO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON RCG HOLDINGS LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,487,559
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,487,559
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON C4S & CO., L.L.C.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 2,487,559
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 2,487,559
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON OO

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON PETER A. COHEN
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 2,487,559
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 2,487,559
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON MORGAN B. STARK
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 2,487,559
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 2,487,559
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON JEFFREY M. SOLOMON
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 2,487,559
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 2,487,559
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON THOMAS W. STRAUSS
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 2,487,559
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 2,487,559
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,487,559
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.6%
14	TYPE OF REPORTING PERSON IN

CUSIP NO. 004934105

1	NAME OF REPORTING PERSON JEFFREY C. SMITH
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) x (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -1
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER - 0 -1
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON - 0 -1
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0%
14	TYPE OF REPORTING PERSON IN

1 See Item 5.

CUSIP NO. 004934105

The following constitutes Amendment No. 6 to the Schedule 13D filed by the undersigned (“Amendment No. 6”). This Amendment No. 6 amends the Schedule 13D as specifically set forth.

Item 2.

Identity and Background.

Item 2 is hereby amended and restated to read as follows:

(a)

This statement is filed by:

(i)

Ramius Value and Opportunity Master Fund Ltd, a Cayman Islands exempted company (“Value and Opportunity Master Fund”), with respect to the Shares directly and beneficially owned by it;

(ii)

Ramius Navigation Master Fund Ltd, a Cayman Islands exempted company (“Navigation Master Fund”), with respect to the Shares directly and beneficially owned by it;

(iii)

RCG PB, Ltd, a Cayman Islands exempted company (“RCG PB”), with respect to the Shares directly and beneficially owned by it;

(iv)

Ramius Optimum Investments LLC, a Delaware limited liability company (“ROIL”), with respect to the Shares directly and beneficially owned by it;

(v)

Ramius Enterprise Master Fund Ltd, a Cayman Islands exempted company (“Enterprise Master Fund”), which serves as the sole shareholder of Navigation Master Fund;

(vi)

Ramius Advisors, LLC, a Delaware limited liability company (“Ramius Advisors”), which serves as the investment advisor of Enterprise Master Fund, Navigation Master Fund and RCG PB and the managing member of ROIL;

(vii)

Ramius Value and Opportunity Advisors LLC, a Delaware limited liability company (“Value and Opportunity Advisors”), which serves as the investment manager of Value and Opportunity Master Fund;

(viii)

Ramius LLC, a Delaware limited liability company (“Ramius”), which serves as the sole member of each of Value and Opportunity Advisors and Ramius Advisors;

(ix)

Cowen Group, Inc., a Delaware corporation (“Cowen”), which serves as the sole member of Ramius;

(x)

RCG Holdings LLC, a Delaware limited liability company (“RCG Holdings”), which is a significant shareholder of Cowen;

(xi)

C4S & Co., L.L.C., a Delaware limited liability company (“C4S”), which serves as managing member of RCG Holdings;

(xii)

Peter A. Cohen, who serves as one of the managing members of C4S;

(xiii)

Morgan B. Stark, who serves as one of the managing members of C4S;

CUSIP NO. 004934105

(xiv)

Thomas W. Strauss, who serves as one of the managing members of C4S; and

(xv)

Jeffrey M. Solomon, who serves as one of the managing members of C4S.

Each of the foregoing is referred to as a “Reporting Person” and collectively as the “Reporting Persons.” Each of the Reporting Persons is party to that certain Joint Filing Agreement, as further described in Item 6. Accordingly, the Reporting Persons are hereby filing a joint Schedule 13D.

(b) The address of the principal office of each of ROIL, Ramius Advisors, Value and Opportunity Advisors, Ramius, Cowen, RCG Holdings, C4S, and Messrs. Cohen, Stark, Strauss and Solomon is 599 Lexington Avenue, 20th Floor, New York, New York 10022.

The address of the principal office of each of Value and Opportunity Master Fund, Enterprise Master Fund, Navigation Master Fund and RCG PB is c/o Citco Fund Services (Cayman Islands) Limited, Regatta Office Park, Windward 1, 2nd Floor, PO Box 31106, Grand Cayman KY1-1205, Cayman Islands. The officers and directors of each of Value and Opportunity Master Fund, Enterprise Master Fund, Navigation Master Fund, RCG PB and Cowen and their principal occupations and business addresses are set forth on Schedule A and incorporated by reference in this Item 2.

(c) The principal business of each of Value and Opportunity Master Fund, RCG PB, Navigation Master Fund and ROIL is serving as a private investment fund. Value and Opportunity Master Fund has been formed for the purpose of making equity investments and, on occasion, taking an active role in the management of portfolio companies in order to enhance shareholder value. Each of RCG PB, Navigation Master Fund and ROIL has been formed for the purpose of making equity and debt investments. Enterprise Master Fund is the sole shareholder of Navigation Master Fund. The principal business of Value and Opportunity Advisors is acting as the investment manager of Value and Opportunity Master Fund. The principal business of Ramius Advisors is acting as the investment advisor of each of Navigation Master Fund, Enterprise Master Fund and RCG PB and as the managing member of ROIL. Ramius is engaged in money management and investment advisory services for third parties and proprietary accounts and serves as the sole member of each of Value and Opportunity Advisors and Ramius Advisors. Cowen provides alternative investment management, investment banking, research, and sales and trading services through its business units, Ramius and Cowen and Company. Cowen also serves as the sole member of Ramius. RCG Holdings is a significant shareholder of Cowen. C4S serves as managing member of Ramius. Messrs. Cohen, Strauss, Stark and Solomon serve as co-managing members of C4S.

(d) No Reporting Person, nor any person listed on Schedule A, annexed hereto, has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e) No Reporting Person, nor any person listed on Schedule A, annexed hereto, has, during the last five years, been party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f) Messrs. Cohen, Stark, Strauss and Solomon are citizens of the United States of America.

CUSIP NO. 004934105

Item 3.

Source and Amount of Funds or Other Consideration.

Item 3 is hereby amended and restated to read as follows:

The Shares purchased by Value and Opportunity Master Fund, Navigation Master Fund, RCG PB and ROIL were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases, except as otherwise noted. The aggregate purchase cost of the 2,487,559 Shares beneficially owned in the aggregate by Value and Opportunity Master Fund, Navigation Master Fund, RCG PB and ROIL is approximately $27,171,000, excluding brokerage commissions.

Item 4.

Purpose of Transaction

Item 4 is hereby amended to add the following:

On October 2, 2010, in connection with the Agreement and Plan of Merger dated as of October 2, 2010, among Microsemi Corporation, Artful Acquisition Corp. and the Issuer (the “Merger Agreement”), Microsemi Corporation, Artful Acquisition Corp. and certain of the Reporting Persons entered into a Tender and Support Agreement (the “Tender and Support Agreement”), pursuant to which Value and Opportunity Master Fund, Navigation Master Fund, ROIL and RCG PB agreed to tender in the Offer (as defined in the Merger Agreement) all of their Subject Shares (as defined in the Tender and Support Agreement).

The foregoing description of the Tender and Support Agreement is qualified in its entirety by reference to the full text of the Tender and Support Agreement, which is attached as Exhibit 99.1 hereto and is incorporated herein by reference.

On October 2, 2010, in connection with the Tender and Support Agreement, the Issuer and the Reporting Persons entered into an Agreement of Waiver (the “Waiver”), waiving certain provisions of the Settlement Agreement.

The foregoing description of the Waiver is qualified in its entirety by reference to the full text of the Waiver, which is attached as Exhibit 99.2 hereto and is incorporated herein by reference.

Item 5.

Interest in Securities of the Issuer.

Item 5 is hereby amended and restated to read as follows:

The aggregate percentage of Shares reported owned by each person named herein is based upon 25,916,764 Shares outstanding, as of September 30, 2010, which is the total number of Shares outstanding as reported in the Issuer’s Solicitation, Recommendation Statement on Schedule 14D-9, filed with the Securities and Exchange Commission on October 4, 2010.

A.	Value and Opportunity Master Fund

(a)

As of close of the close of business on October 4, 2010, Value and Opportunity Master Fund beneficially owned 1,211,614 Shares.

Percentage: Approximately 4.7%.

(b)

1. Sole power to vote or direct vote: 1,211,614

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,211,614

4. Shared power to dispose or direct the disposition: 0

(c)

Value and Opportunity Master Fund has not entered into any transactions in the Shares during the past 60 days.

CUSIP NO. 004934105

ROIL

(a)

As of close of the close of business on October 4, 2010, ROIL beneficially owned 31,947 Shares.

Percentage: Less than 1%.

(b)

1. Sole power to vote or direct vote: 31,947

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 31,947

4. Shared power to dispose or direct the disposition: 0

(c)

ROIL has not entered into any transactions in the Shares during the past 60 days.

C.	Navigation Master Fund

(a)

As of the close of business on October 4, 2010, Navigation Master Fund beneficially owned 300,483 Shares.

Percentage: Approximately 1.2%.

(b)

1. Sole power to vote or direct vote: 300,483

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 300,483

4. Shared power to dispose or direct the disposition: 0

(c)

Navigation Master Fund has not entered into any transactions in the Shares during the past 60 days.

D.	Enterprise Master Fund

(a)

Enterprise Master Fund, as the sole shareholder of Navigation Master Fund, may be deemed the beneficial owner of the 300,483 Shares owned by Navigation Master Fund.

Percentage: Approximately 1.2%.

(b)

1. Sole power to vote or direct vote: 300,483

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 300,483

4. Shared power to dispose or direct the disposition: 0

(c)

Enterprise Master Fund has not entered into any transactions in the Shares during the past 60 days.

RCG PB

(a)

As of the close of business on October 4, 2010, RCG PB directly owned 943,515 Shares.

Percentage: Approximately 3.6%.

(b)

1. Sole power to vote or direct vote: 943,515

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 943,515

4. Shared power to dispose or direct the disposition: 0

(c)

RCG PB has not entered into any transactions in the Shares during the past 60 days.

CUSIP NO. 004934105

F.	Ramius Advisors

(a)

Ramius Advisors, as the investment advisor of each of Navigation Master Fund and RCG PB and the managing member of ROIL, may be deemed the beneficial owner of the (i) 300,483 Shares owned by Navigation Master Fund, (iii) 943,515 Shares owned by RCG PB and (iii) 31,947 Shares owned by RIOL.

Percentage: Approximately 4.9%.

(b)

1. Sole power to vote or direct vote: 1,275,945

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,275,945

4. Shared power to dispose or direct the disposition: 0

(c)

Ramius Advisors has not entered into any transactions in the Shares during the past 60 days.

G.	Value and Opportunity Advisors

(a)

Value and Opportunity Advisors, as the investment manager of Value and Opportunity Master Fund, may be deemed the beneficial owner of the 1,211,614 Shares owned by Value and Opportunity Master Fund.

Percentage: Approximately 4.7%.

(b)

1. Sole power to vote or direct vote: 1,211,614

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,211,614

4. Shared power to dispose or direct the disposition: 0

(c)

Value and Opportunity Advisors has not entered into any transactions in the Shares during the past 60 days.

Ramius

(a)

Ramius, as the sole member of each of Value and Opportunity Advisors and Ramius Advisors, may be deemed the beneficial owner of the (i) 1,211,614 Shares owned by Value and Opportunity Master Fund, (ii) 300,483 Shares owned by Navigation Master Fund, (iii) 31,947 Shares owned by ROIL and (iv) 943,515 Shares owned by RCG PB.

Percentage: Approximately 9.6%.

(b)

1. Sole power to vote or direct vote: 2,487,559

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,487,559

4. Shared power to dispose or direct the disposition: 0

(c)

Ramius has not entered into any transactions in the Shares during the past 60 days.

CUSIP NO. 004934105

Cowen

(a)

Cowen, as the sole member of Ramius, may be deemed the beneficial owner of the (i) 1,211,614 Shares owned by Value and Opportunity Master Fund, (ii) 300,483 Shares owned by Navigation Master Fund, (iii) 31,947 Shares owned by ROIL and (iv) 943,515 Shares owned by RCG PB.

Percentage: Approximately 9.6%.

(b)

1. Sole power to vote or direct vote: 2,487,559

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,487,559

4. Shared power to dispose or direct the disposition: 0

(c)

Cowen has not entered into any transactions in the Shares during the past 60 days.

J.	RCG Holdings

(a)

RCG Holdings, as a significant shareholder of Cowen, may be deemed the beneficial owner of the (i) 1,211,614 Shares owned by Value and Opportunity Master Fund, (ii) 300,483 Shares owned by Navigation Master Fund, (iii) 31,947 Shares owned by ROIL and (iv) 943,515 Shares owned by RCG PB.

Percentage: Approximately 9.6%.

(b)

1. Sole power to vote or direct vote: 2,487,559

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,487,559

4. Shared power to dispose or direct the disposition: 0

(c)

RCG Holdings has not entered into any transactions in the Shares during the past 60 days.

C4S

(a)

C4S, as the managing member of RCG Holdings, may be deemed the beneficial owner of the (i) 1,211,614 Shares owned by Value and Opportunity Master Fund, (ii) 300,483 Shares owned by Navigation Master Fund, (iii) 31,947 Shares owned by ROIL and (iv) 943,515 Shares owned by RCG PB.

Percentage: Approximately 9.6%.

(b)

1. Sole power to vote or direct vote: 2,487,559

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 2,487,559

4. Shared power to dispose or direct the disposition: 0

(c)

C4S has not entered into any transactions in the Shares during the past 60 days.

CUSIP NO. 004934105

L.	Messrs. Cohen, Stark, Strauss and Solomon

(a)

Each of Messrs. Cohen, Stark, Strauss and Solomon, as the managing members of C4S, may be deemed the beneficial owner of the (i) 1,211,614 Shares owned by Value and Opportunity Master Fund, (ii) 300,483 Shares owned by Navigation Master Fund, (iii) 31,947 Shares owned by ROIL and (iv) 943,515 Shares owned by RCG PB.

Percentage: Approximately 9.6%.

(b)

1. Sole power to vote or direct vote: 0

2. Shared power to vote or direct vote: 2,487,559

3. Sole power to dispose or direct the disposition: 0

4. Shared power to dispose or direct the disposition: 2,487,559

(c)

None of Messrs. Cohen, Stark, Strauss or Solomon has entered into any transactions in the Shares during the past 60 days.

Mr. Smith

(a)

Mr. Smith does not directly own any Shares. Mr. Smith, as a member of a “group” for the purposes of Section 13(d)(3) of the Exchange Act, may be deemed to be a beneficial owner of the (i) 1,211,614 Shares owned by Value and Opportunity Master Fund, (ii) 300,483 Shares owned by Navigation Master Fund, (iii) 31,947 Shares owned by ROIL and (iv) 943,515 Shares owned by RCG PB.

Percentage: Approximately 9.6%.

(b)

1. Sole power to vote or direct vote: 0

2. Shared power to vote or direct vote: 2,487,559

3. Sole power to dispose or direct the disposition: 0

4. Shared power to dispose or direct the disposition: 2,487,559

(c)

Mr. Smith has not entered into any transactions in the Shares during the past 60 days.

(d)

No person other than the Reporting Persons is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the Shares.

(e)

Not applicable.

Item 6.

Contracts, Arrangements, Understandings, or Relationships with Respect to Securities of the Issuer.

Item 6 is hereby amended to add the following:

Since Amendment No. 5, the Reporting Persons have purchased an aggregate of 63,894 Shares by the Reporting Persons pursuant to the Agreement. As of the close of business on October 4, 2010, the Reporting Persons have purchased a total of 95,244 Shares pursuant to the Agreement. The Agreement allows for the purchase of up to an aggregate of 1,500,000 Shares. Accordingly, the Reporting Persons may purchase 1,404,756 Shares pursuant to the Agreement as of the date hereof. Shares purchased pursuant to the Agreement may be purchased in accordance with trading requirements adopted by the Reporting Persons and the Agreement may be terminated at any time by the Reporting Persons.

On October 2, 2010, Microsemi Corporation, Artful Acquisition Corp. and certain of the Reporting Persons entered into the Tender and Support Agreement as discussed in further detail in Item 4.

On October 2, 2010, the Issuer and the Reporting Persons entered into the Waiver as discussed in further detail in Item 4.

On October 5, 2010, the Reporting Persons entered into a Joint Filing Agreement in which the Reporting Persons agreed to the joint filing on behalf of each of them of statements on Schedule 13D, with respect to securities of the Issuer, to the extent required by applicable law. A copy of this agreement is attached hereto as Exhibit 99.3 and is incorporated herein by reference.

CUSIP NO. 004934105

Item 7.

Material to be Filed as Exhibits.

Item 7 is hereby amended to include the following exhibits:

Exhibit 99.1

Tender and Support Agreement, dated as of October 2, 2010, by and among Microsemi Corporation, Artful Acquisition Corp., Ramius Value and Opportunity Master Fund Ltd, Ramius Optimum Investments LLC, RCG PB, Ltd, Ramius Navigation Master Fund Ltd and Jeffrey C. Smith.

Exhibit 99.2

Agreement of Waiver, dated as of October 2, 2010, by and among Actel Corporation, Ramius Value and Opportunity Master Fund Ltd, Ramius Navigation Master Fund Ltd, RCG PB, Ltd, Ramius Optimum Investments LLC, Ramius Enterprise Master Fund Ltd, Ramius Advisors, LLC, Ramius Value and Opportunity Advisors LLC, Ramius LLC, Cowen Group, Inc., RCG Holdings LLC, C4S & Co., L.L.C., Peter A. Cohen, Morgan B. Stark, Thomas W. Strauss, Jeffrey M. Solomon and Jeffrey C. Smith.

Exhibit 99.3

Joint Filing Agreement by and among Ramius Value and Opportunity Master Fund Ltd, Ramius Navigation Master Fund Ltd, RCG PB, Ltd, Ramius Optimum Investments LLC, Ramius Enterprise Master Fund Ltd, Ramius Advisors, LLC, Ramius Value and Opportunity Advisors LLC, Ramius LLC, Cowen Group, Inc., RCG Holdings LLC, C4S & Co., L.L.C., Peter A. Cohen, Morgan B. Stark, Thomas W. Strauss, Jeffrey M. Solomon and Jeffrey C. Smith, dated October 5, 2010.

CUSIP NO. 004934105

SIGNATURES

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

Dated: October 5, 2010

RAMIUS VALUE AND OPPORTUNITY MASTER FUND LTD

By: Ramius Value and Opportunity Advisors LLC,

its investment manager

RAMIUS NAVIGATION MASTER FUND LTD

By: Ramius Advisors, LLC,

its investment advisor

RAMIUS ENTERPRISE MASTER FUND LTD

By: Ramius Advisors, LLC,

its investment advisor

RAMIUS OPTIMUM INVESTMENTS LLC

By: Ramius Advisors, LLC,

its managing member

RCG PB, LTD

By: Ramius Advisors, LLC,

its investment advisor

RAMIUS VALUE AND OPPORTUNITY ADVISORS LLC

By: Ramius LLC,

its sole member

RAMIUS ADVISORS, LLC

By: Ramius LLC,

its sole member

RAMIUS LLC

By: Cowen Group, Inc.,

its sole member

COWEN GROUP, INC.

RCG HOLDINGS LLC

By: C4S & Co., L.L.C.,

its managing member

C4S & CO., L.L.C.

By:	/s/ Owen S. Littman
	Name:	Owen S. Littman
	Title:	Authorized Signatory

/s/ Owen S. Littman

Owen S. Littman

As attorney-in-fact for Jeffrey M. Solomon,

Peter A. Cohen, Morgan B. Stark and Thomas

W. Strauss

/s/ Jeffrey C. Smith
JEFFREY C. SMITH

CUSIP NO. 004934105

SCHEDULE A

Directors and Officers of Ramius Value and Opportunity Master Fund Ltd

Name and Position	Principal Occupation	Principal Business Address	Citizenship

Owen S. Littman Director	General Counsel of Cowen Group, Inc.	599 Lexington Avenue 20th Floor New York, New York 10022	United States

Mark R. Mitchell Director	Partner Managing Director of Ramius LLC	599 Lexington Avenue 20th Floor New York, New York 10022	United States

CFS Company Ltd. Director	Nominee Company registered with Cayman Islands Monetary Authority and is affiliated with Administrator of the Fund	c/o Citco Fund Services (Cayman Islands) Limited Regatta Office Park Windward 1, 2nd Floor PO Box 31106 Grand Cayman KY1-1205 Cayman Islands	Cayman Islands
CSS Corporation Ltd. Secretary	Affiliate of the Administrator of the Fund	c/o Citco Fund Services (Cayman Islands) Limited Regatta Office Park Windward 1, 2nd Floor PO Box 31106 Grand Cayman KY1-1205 Cayman Islands	Cayman Islands

Directors and Officers of Ramius Enterprise Master Fund Ltd

Name and Position	Principal Occupation	Principal Business Address	Citizenship

Morgan B. Stark Director	Chairman of Ramius LLC	599 Lexington Avenue 20th Floor New York, New York 10022	United States

Owen S. Littman Director	General Counsel of Cowen Group, Inc.	599 Lexington Avenue 20th Floor New York, New York 10022	United States

CFS Company Ltd. Director	Nominee Company registered with Cayman Islands Monetary Authority and is affiliated with Administrator of the Fund	c/o Citco Fund Services (Cayman Islands) Limited Regatta Office Park Windward 1, 2nd Floor PO Box 31106 Grand Cayman KY1-1205 Cayman Islands	Cayman Islands
CSS Corporation Ltd. Secretary	Affiliate of the Administrator of the Fund	c/o Citco Fund Services (Cayman Islands) Limited Regatta Office Park Windward 1, 2nd Floor PO Box 31106 Grand Cayman KY1-1205 Cayman Islands	Cayman Islands

CUSIP NO. 004934105

Directors and Officers of Ramius Navigation Master Fund Ltd

Name and Position	Principal Occupation	Principal Business Address	Citizenship

Jeffrey C. Smith Director	Partner Managing Director of Ramius LLC	599 Lexington Avenue 20th Floor New York, New York 10022	United States

Directors and Officers of RCG PB, Ltd

Name and Position	Principal Occupation	Principal Business Address	Citizenship

Morgan B. Stark Director	Chief Executive Officer and President of Ramius LLC	599 Lexington Avenue 20th Floor New York, New York 10022	United States

Owen S. Littman Director	General Counsel of Cowen Group, Inc.	599 Lexington Avenue 20th Floor New York, New York 10022	United States

CFS Company Ltd. Director	Nominee Company registered with Cayman Islands Monetary Authority and is affiliated with Administrator of the Fund	c/o Citco Fund Services (Cayman Islands) Limited Regatta Office Park Windward 1, 2nd Floor PO Box 31106 Grand Cayman KY1-1205 Cayman Islands	Cayman Islands
CSS Corporation Ltd. Secretary	Affiliate of the Administrator of the Fund	c/o Citco Fund Services (Cayman Islands) Limited Regatta Office Park Windward 1, 2nd Floor PO Box 31106 Grand Cayman KY1-1205 Cayman Islands	Cayman Islands

CUSIP NO. 004934105

Directors and Officers of Cowen Group, Inc.

Name and Position	Principal Occupation	Principal Business Address	Citizenship

Peter A. Cohen Chairman of the Board and Chief Executive Officer	Chief Executive Officer of Cowen Group, Inc.	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Steven Kotler Director	Vice Chairman of Gilbert Global Equity Partners	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Jules B. Kroll Director	President of JEMKroll Group	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

David M. Malcolm Director	Chairman of Cowen and Company, LLC	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Jerome S. Markowitz Director	Senior Partner at Conifer Securities LLC	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Jack H. Nusbaum Director	Chairman of Willkie Farr & Gallagher LLP	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Edoardo Spezzotti Director	Senior Executive Vice President of Unicredit Group	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	Italy

CUSIP NO. 004934105

John E. Toffolon, Jr. Lead Director	Director, Westway Group, Inc.	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Christopher A. White Chief of Staff	Chief of Staff of Cowen Group, Inc.	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Joseph R. Wright Director	Senior Advisor to The Chart Group, L.P. and Director of Scientific Games Corporation	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Morgan B. Stark Member of Executive and Operating Committees	Chairman of Ramius LLC	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Thomas W. Strauss Member of Executive and Operating Committees	President of Ramius LLC	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Stephen A. Lasota Chief Financial Officer	Chief Financial Officer of Ramius LLC	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

Jeffrey M. Solomon Chief Operating Officer, Chief Strategy Officer, Chairman of the Investment Committee and member of the Operating Committee	Chief Operating Officer of Cowen Group, Inc.	c/o Cowen Group, Inc. 599 Lexington Avenue 20th Floor New York, New York 10022	United States

ACTEL CORP SC 13D/A