Riley Investment Management SC 13D/A DDI / Riley Investment Management ownership change

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-2-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND

AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a)

(Amendment No. 6)1

DDi CORP.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

233162502

(CUSIP Number)

Riley Investment Management LLC

Attn:  Bryant R. Riley

11100 Santa Monica Blvd.

Suite 800

Los Angeles, CA 90025

(310) 966-1445

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

March 11, 2011

(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 the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box: 0

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See Rule 13d-7(b) for other parties to whom copies are to be sent.

(Continued on following pages)

———————

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. 233162502  13D  Page 2

1	NAME OF REPORTING PERSON  S.S. OR IRS. IDENTIFICATION NO. OF ABOVE PERSON  Riley Investment Partners, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*  (a)   [_]  (b)   [X]
3	SEC USE ONLY
4	SOURCE OF FUNDS*  WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)        [_]
6	CITIZENSHIP OR PLACE OF ORGANIZATION  Delaware
NUMBER OF SHARES		7	SOLE VOTING POWER  288,412
BENEFICIALLY OWNED  BY		8	SHARED VOTING POWER  -0-
EACH REPORTING		9	SOLE DISPOSITIVE POWER  288,412
PERSON WITH		10	SHARED DISPOSITIVE POWER  -0-
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  288,412
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES SHARES*   [_]
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  1.4 % 1
14	TYPE OF REPORTING PERSON*  PN

__________________

1 Based on 20,196,243 shares of common stock of DDi CORP. (the “Issuer”) outstanding as of February 22, 2011, as reported in the Issuer’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010 filed with the Securities and Exchange Commission on February 22, 2011.

 CUSIP No. 233162502  13D  Page 3

1	NAME OF REPORTING PERSON S .S. OR IRS. IDENTIFICATION NO. OF ABOVE PERSON  Riley Investment Management LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*  (a)   [_]  (b)   [X]
3	SEC USE ONLY
4	SOURCE OF FUNDS*  AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)       [_]
6	CITIZENSHIP OR PLACE OF ORGANIZATION  Delaware
NUMBER OF SHARES		7	SOLE VOTING POWER  838,610 2
BENEFICIALLY OWNED BY		8	SHARED VOTING POWER  0
EACH REPORTING		9	SOLE DISPOSITIVE POWER  838,610 2
PERSON WITH		10	SHARED DISPOSITIVE POWER  0
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  838,610 3
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES SHARES*  [X]
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  4.2% 1
14	TYPE OF REPORTING PERSON*  IA

_____________________
  

2 Because Riley Investment Management LLC has sole investment and voting power over 288,412 shares of Common Stock held by Riley Investment Partners, L.P. and 550,198 shares of Common Stock held in managed accounts of its investment advisory clients, Riley Investment Management LLC may be deemed to have beneficial ownership of these shares.

 CUSIP No. 233162502  13D  Page 4

1	NAME OF REPORTING PERSON  S.S. OR IRS. IDENTIFICATION NO. OF ABOVE PERSON  B. Riley &  Co., LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*   (a)   [_]   (b)   [X]
3	SEC USE ONLY
4	SOURCE OF FUNDS*  WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)       [_]
6	CITIZENSHIP OR PLACE OF ORGANIZATION  Delaware
NUMBER OF SHARES		7	SOLE VOTING POWER  155,191
BENEFICIALLY OWNED BY		8	SHARED VOTING POWER  0
EACH REPORTING		9	SOLE DISPOSITIVE POWER  155,191
PERSON WITH		10	SHARED DISPOSITIVE POWER  0
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  155,191
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES SHARES*  [_]
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  0.8 % 1
14	TYPE OF REPORTING PERSON*  BD

 CUSIP No. 233162502  13D  Page 5

1	NAME OF REPORTING PERSON  S.S. OR IRS. IDENTIFICATION NO. OF ABOVE PERSON  B. Riley & Co. Retirement Trust
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*  (a)   [_]  (b)   [X]
3	SEC USE ONLY
4	SOURCE OF FUNDS*  WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)       [_]
6	CITIZENSHIP OR PLACE OF ORGANIZATION  United States
NUMBER OF SHARES		7	SOLE VOTING POWER  42,070
BENEFICIALLY OWNED BY		8	SHARED VOTING POWER  0
EACH REPORTING		9	SOLE DISPOSITIVE POWER  42,070
PERSON WITH		10	SHARED DISPOSITIVE POWER  0
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  42,070
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES SHARES*  [_]
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)   0.2 %1
14	TYPE OF REPORTING PERSON*  EP

 CUSIP No. 233162502  13D  Page 6

1	NAME OF REPORTING PERSON  S.S. OR IRS. IDENTIFICATION NO. OF ABOVE PERSON  Bryant R. Riley
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*  (a)   [_]  (b)   [X]
3	SEC USE ONLY
4	SOURCE OF FUNDS*  AF
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)       [_]
6	CITIZENSHIP OR PLACE OF ORGANIZATION  United States
NUMBER OF SHARES		7	SOLE VOTING POWER  1,093,8713
BENEFICIALLY OWNED BY		8	SHARED VOTING POWER  0
EACH REPORTING		9	SOLE DISPOSITIVE POWER  1,093,871 3
PERSON WITH		10	SHARED DISPOSITIVE POWER  0
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON  1,093,8713
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES SHARES*  [X]
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)  5.5% 1
14	TYPE OF REPORTING PERSON*  IN

________________

3Because Riley Investment Management LLC has sole voting and investment power over Riley Investment Partners, L.P.’s security holdings and certain of its investment advisory clients and Mr. Riley, in his role as the sole manager of Riley Investment Management LLC, controls its voting and investment decisions, Mr. Riley may be deemed to have beneficial ownership of the 288,412 shares of Common Stock held by Riley Investment Partners, L.P. and 550,198 shares held in managed accounts of its investment advisory clients.  Includes 155,191 shares of Common Stock owned by B. Riley & Co., LLC. Mr. Riley is the Chairman and sole indirect equity owner of B. Riley & Co., LLC. Includes 42,070 shares owned by B. Riley & Co. Retirement Trust.  Mr. Riley is Trustee of the B. Riley & Co. Retirement Trust.  Includes options exercisable to purchase 10.000 shares of Common Stock held by Mr. Riley.  Includes 48,000 shares held in custodial accounts for Mr. Riley’s children of which Mr. Riley is the Custodian.

 CUSIP No. 233162502  13D  Page 7

Item 5. Interest in Securities of the Issuer

(c)           As of March 11, 2011 Riley Investment Management LLC no longer maintains shared voting and dispositive power over 310,794 shares of Common Stock held in a managed account by its investment advisory client.  Mr. Riley had previously disclaimed beneficial ownership of these shares.

 CUSIP No. 233162502  13D  Page 8

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: March 8, 2011

Riley Investment Partners, L.P.
	By: Riley Investment Management, its General Partner
By:	/s/ BRYANT R. RILEY
	Bryant R. Riley, Managing Member
Riley Investment Management, LLC
By:	/s/ BRYANT R. RILEY
	Bryant R. Riley, Managing Member
B. Riley & Co., LLC
By:	/s/ BRYANT R. RILEY
	Bryant R. Riley, Chairman
B. Riley & Co. Retirement Trust
By:	/s/ BRYANT R. RILEY
	Bryant R. Riley, Trustee
By:	/s/ BRYANT R. RILEY
	Bryant R. Riley