Dyne Therapeutics SC 13D/A DYNEGY / LS Power Development, L.L.C. ownership change

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Amendment No. 6)

Under the Securities Exchange Act of 1934

Dynegy Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

26817G300

(CUSIP Number)

David A. Kurzweil
Latham & Watkins LLP
885 Third Avenue
New York, New York 10022
(212) 906-1200

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

May 24, 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 which is subject of this Schedule 13D, and is filing this statement because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box.o

* 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. 26817G300 

1	NAME OF REPORTING PERSON: LS Power Development, LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	SOURCE OF FUNDS:
	OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)
	o
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Delaware
		7	SOLE VOTING POWER:
NUMBER OF			0
SHARES		8	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			8,318,834
EACH		9	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			0
WITH:		10	SHARED DISPOSITIVE POWER:
			8,318,834
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	8,318,834
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
	6.9%*
14	TYPE OF REPORTING PERSON
	OO

*As reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Issuer’s 1-for-5 reverse stock split effected on May 25, 2010.

Page 2 of 14

CUSIP No. 26817G300 

1	NAME OF REPORTING PERSON: LS Power Partners, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	SOURCE OF FUNDS:
	OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)
	o
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Delaware
		7	SOLE VOTING POWER:
NUMBER OF			0
SHARES		8	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			7,121,921
EACH		9	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			0
WITH:		10	SHARED DISPOSITIVE POWER:
			7,121,921
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	7,121,921
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
	5.9%*
14	TYPE OF REPORTING PERSON
	PN

*As reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Issuer’s 1-for-5 reverse stock split effected on May 25, 2010.

Page 3 of 14

CUSIP No. 26817G300 

1	NAME OF REPORTING PERSON: LS Power Associates, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	SOURCE OF FUNDS:
	OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)
	o
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Delaware
		7	SOLE VOTING POWER:
NUMBER OF			0
SHARES		8	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			1,196,913
EACH		9	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			0
WITH:		10	SHARED DISPOSITIVE POWER:
			1,196,913
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	1,196,913
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
	1.0%*
14	TYPE OF REPORTING PERSON
	PN

*As reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Issuer’s 1-for-5 reverse stock split effected on May 25, 2010.

Page 4 of 14

CUSIP No. 26817G300 

1	NAME OF REPORTING PERSON: LS Power Equity Partners, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	SOURCE OF FUNDS:
	OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)
	o
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Delaware
		7	SOLE VOTING POWER:
NUMBER OF			0
SHARES		8	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			4,282,075
EACH		9	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			0
WITH:		10	SHARED DISPOSITIVE POWER:
			4,282,075
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	4,282,075
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
	3.6%*
14	TYPE OF REPORTING PERSON
	PN

*As reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Issuer’s 1-for-5 reverse stock split effected on May 25, 2010.

Page 5 of 14

CUSIP No. 26817G300 

1	NAME OF REPORTING PERSON: LS Power Equity Partners PIE I, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	SOURCE OF FUNDS:
	OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)
	o
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Delaware
		7	SOLE VOTING POWER:
NUMBER OF			0
SHARES		8	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			2,599,276
EACH		9	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			0
WITH:		10	SHARED DISPOSITIVE POWER:
			2,599,276
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	2,599,276
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
	2.2%*
14	TYPE OF REPORTING PERSON
	PN

*As reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Issuer’s 1-for-5 reverse stock split effected on May 25, 2010.

Page 6 of 14

CUSIP No. 26817G300 

1	NAME OF REPORTING PERSON: LSP Gen Investors, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	SOURCE OF FUNDS:
	OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)
	o
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Delaware
		7	SOLE VOTING POWER:
NUMBER OF			0
SHARES		8	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			103,115
EACH		9	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			0
WITH:		10	SHARED DISPOSITIVE POWER:
			103,115
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	103,115
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
	0.1%*
14	TYPE OF REPORTING PERSON
	PN

*As reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Issuer’s 1-for-5 reverse stock split effected on May 25, 2010.

Page 7 of 14

CUSIP No. 26817G300 

1	NAME OF REPORTING PERSON: Mikhail Segal
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (SEE INSTRUCTIONS):
	(a)   o
	(b)   o
3	SEC USE ONLY:
4	SOURCE OF FUNDS:
	OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)
	o
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	United States
		7	SOLE VOTING POWER:
NUMBER OF			0
SHARES		8	SHARED VOTING POWER:
BENEFICIALLY
OWNED BY			8,318,834
EACH		9	SOLE DISPOSITIVE POWER:
REPORTING
PERSON			0
WITH:		10	SHARED DISPOSITIVE POWER:
			8,318,834
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
	8,318,834
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11):
	6.9%*
14	TYPE OF REPORTING PERSON
	IN

*As reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Issuer’s 1-for-5 reverse stock split effected on May 25, 2010.

Page 8 of 14

This Amendment No. 6 amends the statement on Schedule 13D filed on December 10, 2009 and amended on March 22, 2010, April 2, 2010, April 20, 2010, April 30, 2010 and May 17, 2010 (the “Schedule 13D”), by and on behalf of the Reporting Persons relating to the Common Stock of Dynegy Inc. Capitalized terms used but not defined in this Amendment No. 6 shall have the same meanings herein as are ascribed to such terms in the Schedule 13D. This Amendment No. 6 reports beneficial ownership of the Issuer’s Common Stock as of May 26, 2010.

On May 25, 2010, the Issuer effected a reverse 1-for-5 stock split of its Common Stock (the “Reverse Stock Split”). The share numbers reported in this Amendment No. 6 reflect the Reverse Stock Split, except as specifically stated otherwise in Annex A.

Item 1. Security and Issuer.

The information set forth in Item 1 is hereby amended and supplemented with the following:

     On or about May 25, 2010, the Issuer changed the name of its Class A Common Stock to Common Stock.

Item 5. Interest in Securities of the Issuer.

The information set forth in Item 5 is hereby amended and supplemented with the following:

     (a) and (b) The information contained on the cover pages to this Schedule 13D and Item 3 is incorporated herein by reference.

     As of May 26, 2010, the Reporting Persons held a total of 8,318,834 shares of the Issuer’s Common Stock. Of these shares, LSP Partners directly holds 137,455 shares, LSP Associates directly holds 1,196,913 shares, LSPEP directly holds 4,282,075 shares, PIE I directly holds 2,599,276 shares, and Gen Investors directly holds 103,115 shares. As a result of its relationship with LSPEP, PIE I and Gen Investors, LSP Partners may be deemed the beneficial owner of 7,121,921 shares of Common Stock, representing approximately 5.9% of the outstanding shares of Common Stock as reported in the Issuer’s Quarterly Report on Form 10-Q filed on May 10, 2010, adjusted for the Reverse Stock Split. As a result of its relationship with LSP Partners and LSP Associates, LSP Development may be deemed the beneficial owner of 8,318,834 shares of Common Stock, representing approximately 6.9% of the outstanding shares of Common Stock as calculated in the previous sentence. As a result of his position, Mikhail Segal may be deemed to control LSP Development and to have shared beneficial ownership of 8,318,834 shares of Common Stock, representing approximately 6.9% of the outstanding shares of Common Stock as calculated above.

     (c) Please see Annex A for a list of transactions in the Issuer’s Common Stock from May 17, 2010 to May 26, 2010. All of the transactions reported on Annex A were executed through brokers and settled through facilities of The Depository Trust & Clearing Corporation (DTCC).

     (d) Not applicable.

     (e) Not applicable.

Page 9 of 14

Item 7. Material to be Filed as Exhibits.

1. Joint Filing Agreement, dated as of December 10, 2009, by and among the Reporting Persons. (incorporated by reference to Exhibit 1 to the Reporting Persons Schedule 13D filed on December 10, 2009).

2. Purchase and Sale Agreement, dated as of August 9, 2009, among LS Power Partners, L.P., LS Power Associates, L.P., LS Power Equity Partners, L.P., LS Power Equity Partners PIE I, L.P., LSP Gen Investors, L.P., Port River, LLC, Valley Road, LLC, Dos Rios, LLC, Dynegy Inc., Dynegy Gen Finance Co, LLC, Southwest Power Partners, LLC, Riverside Generation, Inc., Dynegy Renaissance Power, Inc., Bluegrass Generation, Inc., Dynegy Midwest Generation, Inc., RRP Company, Dynegy Power Services, Inc., and Dynegy Falcon Holdings Inc. (incorporated by reference to Exhibit 2.1 to the Issuer’s Form 8-K filed with the Securities and Exchange Commission on August 13, 2009).

3. Amendment No. 1 to the Purchase and Sale Agreement, dated as of November 25, 2009, by and among LS Power Partners, L.P., LS Power Associates, L.P., LS Power Equity Partners, L.P., LS Power Equity Partners PIE I, L.P., LSP Gen Investors, L.P., Port River, LLC, Valley Road, LLC, Dos Rios, LLC, Dynegy Inc., Dynegy Gen Finance Co, LLC, Southwest Power Partners, LLC, Riverside Generation, Inc., Dynegy Renaissance Power, Inc., Bluegrass Generation, Inc., Dynegy Midwest Generation, Inc., RRP Company, Dynegy Power Services, Inc., and Dynegy Falcon Holdings Inc. (incorporated by reference to Exhibit 2.1 to the Issuer’s Form 8-K filed with the Securities and Exchange Commission on December 1, 2009).

4. Shareholder Agreement, dated as of August 9, 2009, among Dynegy Inc. and LS Power Partners, L.P., LS Power Associates, L.P., LS Power Equity Partners, L.P., LS Power Equity Partners PIE I, L.P., and LSP Gen Investors, L.P. (incorporated by reference to Exhibit 10.1 to the Issuer’s Form 8-K filed with the Securities and Exchange Commission on August 13, 2009).

5. Amendment No. 1 to the Registration Rights Agreement dated September 14, 2006 by and between Dynegy Inc. and LS Power Partners, L.P., LS Power Associates, L.P., LS Power Equity Partners, L.P., LS Power Equity Partners PIE I, L.P., and LSP Gen Investors, L.P. (incorporated by reference to Exhibit 10.2 to the Issuer’s Form 8-K filed with the Securities and Exchange Commission on August 13, 2009).

6. Registration Rights Agreement, dated as of September 14, 2006, among Dynegy Acquisition, Inc., LS Power Partners, L.P., LS Power Associates, L.P., LS Power Equity Partners, L.P., LS Power Equity Partners PIE I, L.P. and LSP Gen Investors, L.P. (incorporated by reference to Exhibit 4.2 to the Current Report on Form 8-K of Dynegy Inc. filed on September 19, 2006, File No. 1-15659).

Page 10 of 14

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.

Date: May 27, 2010

LS POWER DEVELOPMENT LLC
By:	/s/ Darpan Kapadia
Name:	Darpan Kapadia
Title:	Managing Director
LS POWER PARTNERS, L.P.
By:	/s/ Darpan Kapadia
Name:	Darpan Kapadia
Title:	Managing Director
LS POWER ASSOCIATES, L.P.
By:	LS Power Development, LLC, its
	General Partner
By:	/s/ Darpan Kapadia
Name:	Darpan Kapadia
Title:	Managing Director
LS POWER EQUITY PARTNERS, L.P.
By:	LS Power Partners, L.P., its General
	Partner
By:	/s/ Darpan Kapadia
Name:	Darpan Kapadia
Title:	Managing Director

Page 11 of 14

LS POWER EQUITY PARTNERS PIE, L.P.
By:	LS Power Partners, L.P., its General
	Partner
By:	/s/ Darpan Kapadia
Name:	Darpan Kapadia
Title:	Managing Director
LSP GEN INVESTORS, L.P.
By:	LS Power Partners, L.P., its General
	Partner
By:	/s/ Darpan Kapadia
Name:	Darpan Kapadia
Title:	Managing Director
MIKHAIL SEGAL
/s/ Mikhail Segal

Page 12 of 14

ANNEX A

Transactions in Dynegy Inc. Class A Common Stock
May 17, 2010 to May 26, 2010

Date of Transaction	Nature of Transaction	Number of Shares		Avg. Price per Share
LS Power Associates, L.P.
May 17, 2010*	SELL		109,280	$	1.2832
May 18, 2010*	SELL		88,122	$	1.2890
May 19, 2010*	SELL		82,357	$	1.2211
May 20, 2010*	SELL		92,540	$	1.1608
May 21, 2010*	SELL		146,941	$	1.1242
May 24, 2010*	SELL		360,416	$	1.0580
May 25, 2010	SELL		150,347	$	4.7833
May 26, 2010	SELL		83,068	$	5.0777
LS Power Equity Partners, L.P.
May 17, 2010*	SELL		391,808	$	1.2832
May 18, 2010*	SELL		315,948	$	1.2890
May 19, 2010*	SELL		295,282	$	1.2211
May 20, 2010*	SELL		331,791	$	1.1608
May 21, 2010*	SELL		526,839	$	1.1242
May 24, 2010*	SELL		1,338,688	$	1.0580
May 25, 2010	SELL		539,050	$	4.7833
May 26, 2010	SELL		297,827	$	5.0777
LS Power Equity Partners PIE I, L.P.
May 17, 2010*	SELL		237,582	$	1.2832
May 18, 2010*	SELL		191,583	$	1.2890
May 19, 2010*	SELL		179,051	$	1.2211
May 20, 2010*	SELL		201,190	$	1.1608
May 21, 2010*	SELL		319,461	$	1.1242
May 24, 2010*	SELL		798,064	$	1.0580
May 25, 2010	SELL		326,865	$	4.7833
May 26, 2010	SELL		180,595	$	5.0777
LS Power Partners, L.P.
May 17, 2010*	SELL		12,724	$	1.2832
May 18, 2010*	SELL		10,260	$	1.2890
May 19, 2010*	SELL		9,589	$	1.2211
May 20, 2010*	SELL		10,775	$	1.1608
May 21, 2010*	SELL		17,109	$	1.1242
May 24, 2010*	SELL		51,488	$	1.0580
May 25, 2010	SELL		17,505	$	4.7833
May 26, 2010	SELL		9,672	$	5.0777

Page 13 of 14

Date of Transaction	Nature of Transaction	Number of Shares		Avg. Price per Share
LSP Gen Investors, L.P.
May 17, 2010*	SELL		9,323	$	1.2832
May 18, 2010*	SELL		7,518	$	1.2890
May 19, 2010*	SELL		7,026	$	1.2211
May 20, 2010*	SELL		7,895	$	1.1608
May 21, 2010*	SELL		12,536	$	1.1242
May 24, 2010*	SELL		25,744	$	1.0580
May 25, 2010	SELL		12,827	$	4.7833
May 26, 2010	SELL		7,087	$	5.0777

* This transaction was executed prior to the Reverse Stock Split. The Number of Shares and Average Price per Share reported for this transaction have not been adjusted for the Reverse Stock Split.

Page 14 of 14