Schedule 13G

-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, ImCeb5fr4Bz7M++OOojPpa3ng44c602py+Zk1R87EMgOejLroBC6n1tBqa+ZKM4Y ovwJho2CTYXqKW/vX7p17A== 0001193125-06-254498.txt : 20061215 0001193125-06-254498.hdr.sgml : 20061215 20061215170451 ACCESSION NUMBER: 0001193125-06-254498 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20061215 DATE AS OF CHANGE: 20061215 GROUP MEMBERS: DORSET MANAGEMENT CORPORATION SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: CERUS CORP CENTRAL INDEX KEY: 0001020214 STANDARD INDUSTRIAL CLASSIFICATION: BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836] IRS NUMBER: 680262011 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-51875 FILM NUMBER: 061281212 BUSINESS ADDRESS: STREET 1: 2411 STANWELL DR CITY: CONCORD STATE: CA ZIP: 94520 BUSINESS PHONE: 9252886000 MAIL ADDRESS: STREET 1: 2525 STANWELL DRIVE STREET 2: STE 300 CITY: CONCORD STATE: CA ZIP: 94520 FORMER COMPANY: FORMER CONFORMED NAME: CERUS TECHNOLOGIES INC DATE OF NAME CHANGE: 19960731 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: KNOTT DAVID M CENTRAL INDEX KEY: 0000808722 FILING VALUES: FORM TYPE: SC 13G MAIL ADDRESS: STREET 1: 485 UNDERHILL BLVD STREET 2: STE 205 CITY: SYOSSET STATE: NY ZIP: 11791-3419 SC 13G 1 dsc13g.htm SCHEDULE 13G Schedule 13G

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13G

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED

PURSUANT TO RULE 13d-2(b)

(Amendment No. )¹

Cerus Corporation

(Name of Issuer)

Common Stock, $0.001 Par Value

(Title of Class of Securities)

157085101

(CUSIP Number)

December 7, 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:

¨ Rule 13d-1(b)

x Rule 13d-1(c)

¨ Rule 13d-1(d)

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 cover 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 (the “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. 157085101		13G		Page 2 of 6 Pages


1.		NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

		David M. Knott
2.		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
		(a) ¨
		(b) x
3.		SEC USE ONLY


4.		CITIZENSHIP OR PLACE OF ORGANIZATION

		United States of America


NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5. SOLE VOTING POWER:
		2,078,360
		6. SHARED VOTING POWER:
		103,600
		7. SOLE DISPOSITIVE POWER:
		2,206,260
		8. SHARED DISPOSITIVE POWER:
		0


9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	2,206,260
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*	¨


11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

	7.0%
12.	TYPE OF REPORTING PERSON*

	IN

*	SEE INSTRUCTIONS BEFORE FILLING OUT!


CUSIP No. 157085101		13G		Page 3 of 6 Pages


1.		NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

		Dorset Management Corporation
		11-2873658
2.		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
		(a) ¨
		(b) x
3.		SEC USE ONLY


4.		CITIZENSHIP OR PLACE OF ORGANIZATION

		United States of America


NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5. SOLE VOTING POWER:
		2,078,360
		6. SHARED VOTING POWER:
		103,600
		7. SOLE DISPOSITIVE POWER:
		2,206,260
		8. SHARED DISPOSITIVE POWER:
		0


9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

	2,206,260
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*	¨


11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

	7.0%
12.	TYPE OF REPORTING PERSON*

	CO

*	SEE INSTRUCTIONS BEFORE FILLING OUT!

Item 1

(a)

Name of Issuer:

Cerus Corporation

Item 1

(b)

Address of Issuer’s Principal Executive offices:

2411 Stanwell Drive

Concord, CA 94520

Item 2

(a)

Name of Person(s) Filing:

David M. Knott; Dorset Management Corporation

Item 2

(b)

Address of Principal Business Office or, if none, residence:

485 Underhill Boulevard, Suite 205

Syosset, New York 11791

Item 2

(c)

Citizenship or Place of Organization

David M. Knott - United States of America;

Dorset Management Corporation - New York

Item 2

(d)

Title of Class of Securities:

Common Stock, $0.001 Par Value

Item 2

(e)

CUSIP Number:

157085101

Item 3

If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a:

(a)

Broker or dealer registered under Section 15 of the Exchange Act;

(b)

Bank as defined in Section 3(a)(6) of the Exchange Act;

(c)

Insurance company as defined in Section 3(a)(19) of the Exchange Act;

(d)

Investment company registered under Section 8 of the Investment Company Act;

(e)

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

(f)

An employee benefit plan, or endowment fund in accordance with rule 13d-1(b)(l)(ii)(F);

(g)

A parent holding company, or control person, in accordance with Rule 13d-1(b)(1)(ii)(G);

(h)

A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act;

(i)

A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;

(j)

Group, in accordance with Rule 13d-1(b)(1)(ii)(J).


Item 4		Ownership:

		David M. Knott; Dorset Management Corporation
		See Rows 5 through 9 and 11 on pages 2 and 3.

Item 5		Ownership of Five Percent or Less of a Class

		N/A

Item 6		Ownership of More than Five Percent on Behalf of Another Person

		Persons, other than the Reporting Persons hereunder, have the right to receive or the power to direct the receipt of dividends, or the proceeds from the sale, of securities reported herein.

Item 7		Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company

		N/A

Item 8		Identification and Classification of Members of the Group

		N/A

Item 9		Notice of Dissolution of Group

		N/A

Item 10		Certification

		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.

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.


December 15, 2006
Date

/s/ David M. Knott
Signature

DORSET MANAGEMENT CORPORATION

By:		/s/ David M. Knott
		David M. Knott, President

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