PDF SOLUTIONS INC — Director's Dealing 2017

May 4, 2017

SEC Form 4/A — Form 4/A

Issuer: PDF SOLUTIONS INC (PDFS)
CIK: 0001120914
Period of Report: 2013-11-08

Reporting Person: WALKER GREGORY C (CFO, VP Finance)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-11-08	Common Stock	M	3750	$6.09	Acquired	15598	Direct
2013-11-08	Common Stock	S	4292	$22.7990	Disposed	11306	Direct
2015-11-01	Common Stock	F	454	$10.56	Disposed	21152	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-11-08	Stock Options (Right to Buy)	$6.09	M	3750	Acquired	2022-11-07	Common Stock (3750)	Direct

Footnotes

F1: Average weighted sale price for shares disposed of in the reported transaction. The shares were sold in multiple brokers' transactions at various market prices per share ranging from $22.777 to $22.83.

F2: The purpose of this amendment is to correct the arithmetical error to increase the total amount by 3750 shares, which were inadvertently subtracted from the total amount on Form 4 filed on 11/12/2013 and all following filings through this Form.

F3: This represents a disposition of shares to the Company to satisfy tax withholding obligations with respect to the vesting of Restricted Stock rights. This is not a sale of shares in the market.

F4: The purpose of this amendment is to correct the arithmetical error in the total amount including 474 shares of common stock purchased under the Employee's Stock Purchase Plan on Form 4 filed on 11/1/2015 and all following filings through this Form.