SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549

SCHEDULE 13G
(RULE 13d - 102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2

(Amendment No. 1)*

PDF Solutions, Inc.
(Name of Issuer)

Common Stock, par value $0.00015 per share
(Title of Class of Securities)

693282105
(CUSIP Number)

December 31, 2014
(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 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).

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Shannon River Partners LP
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
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
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| PN

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Shannon River Master Fund, L.P.
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
3. | SEC USE ONLY
4. | CITIZENSHIP OR PLACE OF ORGANIZATION
| Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:
5. | SOLE VOTING POWER
| 0
6. | SHARED VOTING POWER
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| PN

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Doonbeg Master Fund, L.P.
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
3. | SEC USE ONLY
4. | CITIZENSHIP OR PLACE OF ORGANIZATION
| Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:
5. | SOLE VOTING POWER
| 0
6. | SHARED VOTING POWER
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| PN

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Shannon River Fund Management LLC
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
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
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| OO

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Shannon River Capital Management LLC
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
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
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| OO

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Shannon River Global Management, LLC
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
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
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| OO

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Doonbeg Global Management, LLC
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
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
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| OO

 

 

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

| Spencer Waxman
2. | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
| (a)    [ ]
| (b)    [ ]
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
| 0
7. | SOLE DISPOSITIVE POWER
| 0
8. | SHARED DISPOSITIVE POWER
| 0
9. | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
| 0

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11. | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
| 0%
12. | TYPE OF REPORTING PERSON
| IN

 

 

Item 1(a).                      Name of Issuer:

PDF Solutions, Inc. (the "Issuer").

Item 1(b).                      Address of Issuer's Principal Executive Offices:

333 West San Carlos Street, Suite 1000
San Jose, California 95110

Item 2(a).                      Name of Persons Filing:

The names of the persons filing this statement on Schedule 13G (collectively, the “Reporting Persons”) are:
 
| ⌧ | Shannon River Partners LP (the “Shannon River Partners Fund”),
 
| ⌧ | Shannon River Master Fund, L.P. (the “Shannon River Master Fund”),
 
| ⌧ | Doonbeg Master Fund, L.P. (the “Doonbeg Fund”),
 
| ⌧ | Shannon River Fund Management LLC (“SR Management LLC”),
 
| ⌧ | Shannon River Capital Management LLC (“SR Capital Management”),
 
| ⌧ | Shannon River Global Management, LLC ("SR Global Management"),
 
| ⌧ | Doonbeg Global Management, LLC (“Doonbeg Management”), and
 
| ⌧ | Spencer Waxman, a United States citizen (“Mr. Waxman).
 
SR Management LLC, SR Capital Management, SR Global Management and Doonbeg Management are management entities under common control.

Item 2(b). | Address of Principal Business Office or, if None, Residence:

| The principal business address for each of the Reporting Persons is 850 Third Ave, 13th Floor, New York, New York 10022.

Item 2(c). | | Citizenship:

| The Shannon River Partners Fund is a Delaware limited partnership.

| Each of the SR Management LLC, SR Capital Management, SR Global Management and Doonbeg Management is a Delaware limited liability company.

| Each of the Shannon River Master Fund and the Doonbeg Fund is a Cayman Islands limited partnership.

| Mr. Waxman is a United States citizen.

 

 

Item 2(d). | Title of Class of Securities

                 Common Stock, par value $.00015 per share (the "Common Stock")

Item 2(e). | CUSIP Number:  693282105

Item 3. | If this Statement is Filed Pursuant to Rule 13d-1(b), OR 13d-2(b) or (c), Check Whether the Person Filing is a:

                Not applicable.

Item 4. | Ownership.

As of the date hereof, the Reporting Persons did not beneficially own any 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 Persons have ceased to be the beneficial owner of more than five percent of the class of securities, check the following [X ].

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.

               See Exhibit A to the Schedule 13G filed with the Securities and Exchange Commission on April 11, 2014.

Item 9. | Notice of Dissolution of Group.

                Not applicable.

Item 10. | Certification.

By signing below the undersigned certifies that, to the best of its 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.

 

 

SIGNATURES

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

Dated:  February 17, 2015

SHANNON RIVER PARTNERS LP
By: Shannon River Capital Management LLC, General Partner

By:  /s/ Spencer Waxman
       Spencer Waxman, Managing Member

SHANNON RIVER MASTER FUND, L.P.
By: Shannon River Capital Management LLC, General Partner

By: /s/ Spencer Waxman
      Spencer Waxman, Managing Member

DOONBEG MASTER FUND, L.P.
By: Doonbeg Fund Management, LLC, General Partner

By: /s/ Spencer Waxman
      Spencer Waxman, Managing Member

SHANNON RIVER FUND MANAGEMENT LLC

By: /s/ Spencer Waxman
            Spencer Waxman, Managing Member

SHANNON RIVER CAPITAL MANAGEMENT LLC

By: /s/ Spencer Waxman
            Spencer Waxman, Managing Member

SHANNON RIVER GLOBAL MANAGEMENT, LLC

By: /s/ Spencer Waxman
            Spencer Waxman, Managing Member

DOONBEG GLOBAL MANAGEMENT, LLC

By: /s/ Spencer Waxman
            Spencer Waxman, Managing Member

/s/ Spencer Waxman
                      Spencer Waxman