UNITED STATES

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549


SCHEDULE 13G


Under the Securities Exchange Act of 1934

(Amendment No. ________)*



                   Willdan Group, Inc.       

(Name of Issuer)


                 Common Stock, par value $.01      

(Title of Class of Securities)



     96924N100     

(CUSIP Number)



     November 20, 2015      

(Date of Event Which Requires Filing of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o Rule 13d-1(b)

x Rule 13d-1(c)

o     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 (“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).



13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


Red Oak Partners, LLC

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

Florida

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

416,551

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

416,551

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

416,551

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

5.28%

12.  Type of Reporting Person (See Instructions)

OO
























13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


The Red Oak Fund, LP

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

Delaware

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

102,538

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

102,538

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

102,538

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

1.30%

12.  Type of Reporting Person (See Instructions)

PN



















13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


The Red Oak Long Fund, LP

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

Delaware

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

64,232

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

64,232

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

64,232

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

0.81%

12.  Type of Reporting Person (See Instructions)

PN









13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


The Red Oak Institutional Founders Long Fund, LP

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

Delaware

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

130,522

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

130,522

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

130,522

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

1.65%

12.  Type of Reporting Person (See Instructions)

PN






13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


Wolverine Trading LLC

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

Illinois

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

25,171

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

25,171

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

25,171

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

0.32%

12.  Type of Reporting Person (See Instructions)

OO





















13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


Pinnacle Capital Partners, LLC

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

Florida

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

94,088

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

94,088

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

94,088

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

1.19%

12.  Type of Reporting Person (See Instructions)

OO























13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


Pinnacle Opportunities Fund, LP

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

Delaware

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

94,088

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

94,088

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

94,088

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

1.19%

12.  Type of Reporting Person (See Instructions)

PN























13G

CUSIP No. 96924N100

 

1.  Names of Reporting Persons.


David Sandberg

2.  Check the Appropriate Box if a Member of a Group

(a) o
(b) o

3.  SEC Use Only

4.  Citizenship or Place of Organization.

United States

   Number of Shares
   Beneficially
  Owned by
  Each Reporting
  Person With:

5.  Sole Voting Power

0

6.  Shared Voting Power

416,551

7.  Sole Dispositive Power

0

8.  Shared Dispositive Power

416,551

9.  Aggregate Amount Beneficially Owned by Each Reporting Person

416,551

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)

o

11.  Percent of Class Represented by Amount in Row (11)

5.28%

12.  Type of Reporting Person (See Instructions)

IN























13G

CUSIP No. 96924N100


ITEM 1.

(a) Name of issuer:


Willdan Group, Inc. (the “Issuer”)


(b) Address of Issuer's Principal Executive Offices:


2401 East Katella Avenue, Suite 300

Anaheim, California 92806


ITEM 2.

(a)

The names of the persons (the “Reporting Persons”) filing this Statement (this "Statement") are David Sandberg, the controlling member of Red Oak Partners, LLC, a Florida limited liability company ("Red Oak Partners"), which serves as the general partner of The Red Oak Fund, LP, a Delaware limited partnership (the "Red Oak Fund"), The Red Oak Long Fund, LP, a Delaware limited partnership (the “Red Oak Long Fund”), The Red Oak Institutional Founders Long Fund, LP, a Delaware limited partnership (the "Red Oak Founders Fund"), and a managing member of Pinnacle Capital Partners LLC, a Florida limited liability company (“Pinnacle Partners”), the general partner of Pinnacle Opportunities Fund, LP, a Delaware limited partnership ("Pinnacle Fund" together with the "Red Oak Fund", the “Red Oak Foundes Fund”, and the “Red Oak Long Fund”, the "Funds"). The Funds are private investment vehicles formed for the purpose of investing and trading in a wide variety of securities and financial instruments. In addition, Red Oak Partners has discretionary trading and voting authority over shares held in a separate managed account held by Wolverine Trading LLC (“Wolverine”).  Each of the Reporting Persons hereto disclaims beneficial ownership with respect to any shares other than the shares owned directly by such filer.

(b)  The principal office or business address of the Red Oak Fund, Red Oak Long Fund, Red Oak Founders Fund, Red Oak Partners, Pinnacle Partners, Pinnacle Fund and David Sandberg is 1969 SW 17th Street, Boca Raton, FL 33486.  The principal office or business address of Wolverine is 175 W. Jackson Blvd., Suite 200, Chicago, IL 60604.

(c) David Sandberg is a citizen of the United States.


(d) This Statement relates to Common Stock, $.01 par value, of the Issuer.


(e) The CUSIP Number of the Shares of the Issuer is 96924N100.


ITEM 3.  IF THIS STATEMENT IS FILED PURSUANT TO SS.240.13d-1(b) OR 240.13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:


 

(a)

[_]

Broker or dealer registered under Section 15 of the Act  (15 U.S.C. 78o).

 

(b)

[_]

Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).   

 

(c)

[_]

Insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).   

 

(d)

[_]

Investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

 

(e)

[_]

An investment adviser in accordance with  ss.240.13d-1(b)(1)(ii)(E);   

 

(f)

[_]

An employee benefit plan or endowment fund in accordance with ss.240.13d-1(b)(1)(ii)(F);   

 

(g)

[_]

A parent holding company or control person in accordance with ss.240.13d-1(b)(1)(ii)(G);   

 

(h)

[_]

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);   

 

(i)

[_]

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);   

 

(j)

[_]

Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).


ITEM 4. OWNERSHIP.


Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.


(a) Amount beneficially owned:

Red Oak Partners may be deemed to beneficially own 416,551 shares of Common Stock which includes: 102,538 shares of Common Stock that Red Oak Fund may be deemed to beneficially own, 64,232 shares of Common Stock that Red Oak Long Fund may be deemed to beneficially own, 130,522 shares of Common Stock that Red Oak Founders Fund may be deemed to beneficially own,  94,088 shares of Common Stock that Pinnacle Fund may be deemed to beneficially own, and 25,171 shares of Common Stock that Wolverine may be deemed to beneficially own.  Red Oak Partners has discretionary trading and voting authority over shares held by Wolverine.  

Mr. Sandberg, as the managing member of Red Oak Partners may be deemed to beneficially own the 416,551 shares of Common Stock beneficially owned by Red Oak Partners through the Funds and Wolverine.

(b)

Percent of class:


With respect to David Sandberg and Red Oak Partners, 5.28% of Common Stock.  With respect to the Red Oak Fund, 1.30% of Common Stock.  With respect to the Red Oak Long Fund, 0.81% of Common Stock.  With respect to the Red Oak Founders Fund, 1.65% of Common Stock.  With respect to Pinnacle Partners and Pinnacle Fund, 1.19% of Common Stock.  With respect to Wolverine, 0.32% of Common Stock.


(c) Number of shares as to which such person has:


(i)  Sole power to vote or to direct the vote


0


(ii) Shared power to vote or to direct the vote


With respect to David Sandberg and Red Oak Partners, LLC, 416,551 shares of Common Stock.


(iii) Sole power to dispose or to direct the disposition of


0


(iv) Shared power to dispose or to direct the disposition of


With respect to David Sandberg and Red Oak Partners, LLC, 416,551 shares of Common Stock.



ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.


If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ].


Not applicable.


ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.


Not applicable.


ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE     SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.


Not applicable.


ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.


Not applicable.


ITEM 9. NOTICE OF DISSOLUTION OF GROUP.


Not applicable.


ITEM 10. CERTIFICATIONS.


(a) Not applicable.


(b) By signing below I certify that, to the best of my knowledge and belief, the securities referred to above 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.











SIGNATURE


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


Dated: November 20, 2015



By:

/s/ David Sandberg

Name:

David Sandberg



RED OAK PARTNERS, LLC


By:

/s/ David Sandberg

Name:

David Sandberg

Title:

Managing Member



THE RED OAK FUND, L.P.


By:

RED OAK PARTNERS, LLC,

its general partner


By:

/s/ David Sandberg

Name:

David Sandberg

Title:

Managing Member



THE RED OAK INSTITUTIONAL FOUNDERS LONG FUND, L.P.


By:

RED OAK PARTNERS, LLC,

its general partner


By:

/s/ David Sandberg

Name:

David Sandberg

Title:

Managing Member



PINNACLE CAPITAL PARTNERS, LLC


By:

RED OAK PARTNERS, LLC,

its managing member


By:

/s/ David Sandberg

Name:

David Sandberg

Title:

Managing Member



PINNACLE OPPORTUNITIES FUND, LP


By:

PINNACLE CAPITAL PARTNERS, LLC,

its general partner


By:

/s/ David Sandberg

Name:

David Sandberg

Title:

Managing Member



WOLVERINE TRADING LLC


By:

RED OAK PARTNERS, LLC,

its investment manager


By:

/s/ David Sandberg

Name:

David Sandberg

Title:

Managing Member