United States Semiconductors & Semiconductor Equipment

PDF Solutions Inc (PDFS)

Track

The most recent insider trading activity occurred on May 13, 2025, with a significant BUY transaction by Michael B. Gustafson. Prior to this, John K. Kibarian, President and CEO, made substantial BUY transactions in February 2025. Earlier transactions in late 2024 involved SELL and PROPOSED_SALE activities by Andrzej Strojwas and Nancy Erba.
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Ticker: PDFS Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
GUSTAFSON MICHAEL B
1 purchase — total 145,875 USD
Buy 13 May 2025
Value US$837,962.65 | Price 430.75 | Shares 12,867
Buy 25 Feb 2025
Value US$1,279,746.99 | Price 172.42 | Shares 10,681
Buy 24 Feb 2025
Value US$92,240.00 | Price 23.06 | Shares 4,000
Buy 24 Feb 2025
Value US$783,316.80 | Price 22.80 | Shares 34,356
Sale 17 Dec 2024
Value US$182,402.88 | Price 30.36 | Shares 6,008
Sale 17 Dec 2024
Value US$7,636.65 | Price 31.17 | Shares 245
Sale 16 Dec 2024
Value US$155,193.61 | Price 30.85 | Shares 5,030
Proposed sale 16 Dec 2024
Value US$267,993.95 | Price 30.85 | Shares 8,687
Sale 11 Dec 2024
Value US$61,620.00 | Price 30.81 | Shares 2,000
Proposed sale 11 Dec 2024
Value US$61,620.00 | Price 30.81 | Shares 2,000
Proposed sale 13 Nov 2024
Value US$209,412.97 | Price 33.49 | Shares 6,253
Sale 3 Jun 2024
Value US$190,630.00 | Price 34.66 | Shares 5,500
Proposed sale 3 Jun 2024
Value US$194,865.00 | Price 35.43 | Shares 5,500
Proposed sale 17 May 2024
Value US$323,174.50 | Price 33.50 | Shares 9,647
Sale 17 May 2024
Value US$327,515.65 | Price 33.95 | Shares 9,647
Sale 16 May 2024
Value US$558,165.28 | Price 33.82 | Shares 16,504
Proposed sale 16 May 2024
Value US$203,313.00 | Price 33.00 | Shares 6,161
Sale 15 May 2024
Value US$46,360.36 | Price 34.52 | Shares 1,343
Proposed sale 15 May 2024
Value US$403,167.00 | Price 34.50 | Shares 11,686
Proposed sale 14 May 2024
Value US$230,110.40 | Price 36.80 | Shares 6,253
Sale 26 Feb 2024
Value US$321,155.31 | Price 33.27 | Shares 9,653
Sale 23 Feb 2024
Value US$52,054.00 | Price 34.00 | Shares 1,531
Proposed sale 23 Feb 2024
Value US$385,848.00 | Price 34.50 | Shares 11,184
Sale 21 Feb 2024
Value US$519,450.00 | Price 34.63 | Shares 15,000
Proposed sale 21 Feb 2024
Value US$509,700.00 | Price 33.98 | Shares 15,000
Sale 13 Dec 2023
Value US$150,689.38 | Price 30.86 | Shares 4,883
Sale 12 Dec 2023
Value US$27,128.43 | Price 31.29 | Shares 867
Proposed sale 12 Dec 2023
Value US$179,802.50 | Price 31.27 | Shares 5,750
Sale 29 Nov 2023
Value US$55,025.64 | Price 30.57 | Shares 1,800
Proposed sale 29 Nov 2023
Value US$55,025.64 | Price 30.57 | Shares 1,800
Sale 18 Aug 2023
Value US$102,836.25 | Price 33.75 | Shares 3,047
Proposed sale 18 Aug 2023
Value US$102,836.25 | Price 33.75 | Shares 3,047
Sale 8 Mar 2023
Value US$96,894.00 | Price 38.45 | Shares 2,520
Sale 3 Mar 2023
Value US$585,189.08 | Price 37.64 | Shares 15,547
Sale 28 Feb 2023
Value US$496,154.16 | Price 37.26 | Shares 13,316
Sale 22 Feb 2023
Value US$455,812.50 | Price 36.47 | Shares 12,500
Sale 30 Nov 2022
Value US$617,628.29 | Price 31.00 | Shares 19,926
Sale 29 Nov 2022
Value US$277,895.14 | Price 30.13 | Shares 9,224
Sale 25 Nov 2022
Value US$91,500.00 | Price 30.50 | Shares 3,000
Sale 16 Nov 2022
Value US$59,680.00 | Price 29.84 | Shares 2,000
Sale 16 Nov 2022
Value US$75,125.00 | Price 30.05 | Shares 2,500
Sale 15 Nov 2022
Value US$74,475.00 | Price 29.79 | Shares 2,500
Sale 16 Jun 2022
Value US$286,301.30 | Price 19.90 | Shares 14,387
Sale 15 Jun 2022
Value US$206,200.00 | Price 20.62 | Shares 10,000
Sale 14 Jun 2022
Value US$304,050.00 | Price 20.27 | Shares 15,000
Sale 13 Jun 2022
Value US$83,876.98 | Price 21.02 | Shares 3,990
Sale 9 Jun 2022
Value US$50,834.50 | Price 23.47 | Shares 2,166
Sale 15 Mar 2022
Value US$280,933.50 | Price 25.50 | Shares 11,017
Sale 23 Feb 2022
Value US$0.00 | Price 0.00 | Shares 8,850
Sale 12 Nov 2021
Value US$98,991.90 | Price 33.00 | Shares 3,000
Sale 20 Nov 2020
Value US$183,800.04 | Price 21.18 | Shares 8,678
Sale 6 Nov 2019
Value US$34,870.50 | Price 15.75 | Shares 2,214
Sale 5 Nov 2019
Value US$6,164.42 | Price 15.97 | Shares 386
Sale 13 Jun 2019
Value US$12,949.30 | Price 12.95 | Shares 1,000
Sale 18 Aug 2017
Value US$900,156.00 | Price 15.00 | Shares 60,000
Sale 9 Jun 2017
Value US$790,591.50 | Price 17.57 | Shares 45,000
Sale 24 May 2017
Value US$495,096.00 | Price 16.50 | Shares 30,000
Sale 18 May 2017
Value US$249,174.00 | Price 16.61 | Shares 15,000
Sale 17 Feb 2017
Value US$0.00 | Price 0.00 | Shares 981
Sale 16 Feb 2017
Value US$0.00 | Price 0.00 | Shares 17,952
Sale 6 Dec 2016
Value US$131,486.40 | Price 21.91 | Shares 6,000
Sale 1 Dec 2016
Value US$138,015.00 | Price 23.00 | Shares 6,000
Sale 8 Nov 2016
Value US$123,645.65 | Price 19.85 | Shares 6,229
Sale 12 Sep 2016
Value US$42,376.43 | Price 15.90 | Shares 2,665
Planned sale 9 Aug 2016
Value US$40,499.72 | Price 17.00 | Shares 2,382
Sale 3 Aug 2016
Value US$26,672.00 | Price 16.67 | Shares 1,600
Planned sale 2 Aug 2016
Value US$233,802.76 | Price 16.66 | Shares 14,031
Buy 27 May 2016
Value US$87,095.24 | Price 14.24 | Shares 6,118
Sale 12 Jun 2015
Value US$479,772.66 | Price 16.49 | Shares 29,093
Sale 11 Jun 2015
Value US$96,880.71 | Price 16.40 | Shares 5,907
Sale 5 Mar 2015
Value US$267,902.00 | Price 14,900.00 | Shares 18
Sale 27 Feb 2015
Value US$1,867.90 | Price 18.68 | Shares 100
Sale 23 Feb 2015
Value US$2,056,865.52 | Price 17.52 | Shares 117,401
Sale 20 Feb 2015
Value US$159,856.50 | Price 17.75 | Shares 9,006
Sale 19 Feb 2015
Value US$219,088.25 | Price 12,343.00 | Shares 18
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2025-05-14 2025-05-13 B Purchase
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
12,867 +3.6%
430.75
US$837,963 		12,867 +3.6% 430.75 US$837,963
2025-02-25 2025-02-25 B Purchase
1.1
KIBARIAN JOHN KACHIG

PRESIDENT AND CEO

Executive Director
10,681 +18.0%
172.42
US$1,279,747 		10,681 +18.0% 172.42 US$1,279,747
2025-02-25 2025-02-24 B Purchase
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
43,735 +32.9%
304.92
US$2,326,739 		43,735 +32.9% 304.92 US$2,326,739
2025-02-25 2025-02-24 B Purchase
1.1
KIBARIAN JOHN KACHIG

PRESIDENT AND CEO

Executive Director
34,356 +1.4%
22.80
US$783,317 		34,356 +1.4% 22.80 US$783,317
2024-12-19 2024-12-17 S Sale
2.7
Strojwas Andrzej

CTO

Officer
6,008 -6.4%
30.36
US$182,403 		6,008 -6.4% 30.36 US$182,403
2024-12-19 2024-12-17 S Sale
2.7
Strojwas Andrzej

CTO

Officer
245 -0.3%
31.17
US$7,637 		245 -0.3% 31.17 US$7,637
2024-12-17 2024-12-16 S Sale
2.7
Strojwas Andrzej

CTO

Officer
5,030 -5.0%
30.85
US$155,194 		5,030 -5.0% 30.85 US$155,194
2024-12-16 2024-12-16 PrS Proposed sale
2.7
Strojwas Andrzej

Officer

Officer
8,687
30.85
US$267,994 		8,687 30.85 US$267,994
2024-12-12 2024-12-11 S Sale
2.9
Erba Nancy
Non-Executive Director
2,000 -12.7%
30.81
US$61,620 		2,000 -12.7% 30.81 US$61,620
2024-12-11 2024-12-11 PrS Proposed sale
2.9
NANCY ERBA FAMILY LIVING TRUST

Director

Non-Executive Director
2,000
30.81
US$61,620 		2,000 30.81 US$61,620
2024-11-13 2024-11-13 PrS Proposed sale
2.7
Strojwas Andrzej

Officer

Officer
6,253
33.49
US$209,413 		6,253 33.49 US$209,413
2024-06-04 2024-06-03 S Sale
3.5
Zhang Shuo
Non-Executive Director
5,500 -34.6%
34.66
US$190,630 		5,500 -34.6% 34.66 US$190,630
2024-06-03 2024-06-03 PrS Proposed sale
3.7
Zhang Shuo

Director

Non-Executive Director
5,500
35.43
US$194,865 		5,500 35.43 US$194,865
2024-05-17 2024-05-17 PrS Proposed sale
2.2
Raza Adnan

Officer

Officer
9,647
33.50
US$323,174 		9,647 33.50 US$323,174
2024-05-17 2024-05-17 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
9,647 -16.7%
33.95
US$327,516 		9,647 -16.7% 33.95 US$327,516
2024-05-17 2024-05-16 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
16,504 -22.2%
33.82
US$558,165 		16,504 -22.2% 33.82 US$558,165
2024-05-16 2024-05-16 PrS Proposed sale
2.2
Raza Adnan

Officer

Officer
6,161
33.00
US$203,313 		6,161 33.00 US$203,313
2024-05-17 2024-05-15 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
1,343 -1.8%
34.52
US$46,360 		1,343 -1.8% 34.52 US$46,360
2024-05-15 2024-05-15 PrS Proposed sale
2.2
Raza Adnan

Officer

Officer
11,686
34.50
US$403,167 		11,686 34.50 US$403,167
2024-05-14 2024-05-14 PrS Proposed sale
2.7
Strojwas Andrzej

Officer

Officer
6,253
36.80
US$230,110 		6,253 36.80 US$230,110
2024-02-26 2024-02-26 S Sale
2.9
Li Ye Jane
Non-Executive Director
9,653 -44.3%
33.27
US$321,155 		9,653 -44.3% 33.27 US$321,155
2024-02-26 2024-02-23 S Sale
2.9
Li Ye Jane
Non-Executive Director
1,531 -6.6%
34.00
US$52,054 		1,531 -6.6% 34.00 US$52,054
2024-02-23 2024-02-23 PrS Proposed sale
2.9
Li Revocable Trust

Director

Non-Executive Director
11,184
34.50
US$385,848 		11,184 34.50 US$385,848
2024-02-22 2024-02-21 S Sale
2.0
BRONSON JOSEPH R
Non-Executive Director
15,000 -36.2%
34.63
US$519,450 		15,000 -36.2% 34.63 US$519,450
2024-02-21 2024-02-21 PrS Proposed sale
2.0
BRONSON JOSEPH R

Director

Non-Executive Director
15,000
33.98
US$509,700 		15,000 33.98 US$509,700
2023-12-14 2023-12-13 S Sale
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
4,883 -25.6%
30.86
US$150,689 		4,883 -25.6% 30.86 US$150,689
2023-12-14 2023-12-12 S Sale
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
867 -4.3%
31.29
US$27,128 		867 -4.3% 31.29 US$27,128
2023-12-12 2023-12-12 PrS Proposed sale
3.1
GUSTAFSON MICHAEL B

Officer

Officer
5,750
31.27
US$179,802 		5,750 31.27 US$179,802
2023-11-30 2023-11-29 S Sale
2.9
Erba Nancy
Non-Executive Director
1,800 -10.3%
30.57
US$55,026 		1,800 -10.3% 30.57 US$55,026
2023-11-29 2023-11-29 PrS Proposed sale
2.9
NANCY ERBA TTEE NANCY ERBA FAMILY LIVING TRUST

Director

Non-Executive Director
1,800
30.57
US$55,026 		1,800 30.57 US$55,026
2023-08-21 2023-08-18 S Sale
3.5
Zhang Shuo
Non-Executive Director
3,047 -16.1%
33.75
US$102,836 		3,047 -16.1% 33.75 US$102,836
2023-08-18 2023-08-18 PrS Proposed sale
3.7
Zhang Shuo

Director

Non-Executive Director
3,047
33.75
US$102,836 		3,047 33.75 US$102,836
2023-03-08 2023-03-08 S Sale
2.7
Strojwas Andrzej

CTO

Officer
2,520 -2.8%
38.45
US$96,894 		2,520 -2.8% 38.45 US$96,894
2023-03-06 2023-03-03 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
15,547 -17.2%
37.64
US$585,189 		15,547 -17.2% 37.64 US$585,189
2023-03-02 2023-02-28 S Sale
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
13,316 -44.5%
37.26
US$496,154 		13,316 -44.5% 37.26 US$496,154
2023-02-24 2023-02-22 S Sale
2.0
BRONSON JOSEPH R
Non-Executive Director
12,500 -24.7%
36.47
US$455,812 		12,500 -24.7% 36.47 US$455,812
2022-12-02 2022-11-30 S Sale
2.7
Strojwas Andrzej

CTO

Officer
19,926 -17.6%
31.00
US$617,628 		19,926 -17.6% 31.00 US$617,628
2022-11-29 2022-11-29 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
9,224 -8.6%
30.13
US$277,895 		9,224 -8.6% 30.13 US$277,895
2022-11-29 2022-11-25 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
3,000 -2.7%
30.50
US$91,500 		3,000 -2.7% 30.50 US$91,500
2022-11-17 2022-11-16 S Sale
3.5
Zhang Shuo
Non-Executive Director
2,000 -11.4%
29.84
US$59,680 		2,000 -11.4% 29.84 US$59,680
2022-11-17 2022-11-16 S Sale
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
2,500 -7.7%
30.05
US$75,125 		2,500 -7.7% 30.05 US$75,125
2022-11-17 2022-11-15 S Sale
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
2,500 -7.2%
29.79
US$74,475 		2,500 -7.2% 29.79 US$74,475
2022-06-16 2022-06-16 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
14,387 -14.3%
19.90
US$286,301 		14,387 -14.3% 19.90 US$286,301
2022-06-16 2022-06-15 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
10,000 -9.0%
20.62
US$206,200 		10,000 -9.0% 20.62 US$206,200
2022-06-16 2022-06-14 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
15,000 -11.9%
20.27
US$304,050 		15,000 -11.9% 20.27 US$304,050
2022-06-13 2022-06-13 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
3,990 -3.1%
21.02
US$83,877 		3,990 -3.1% 21.02 US$83,877
2022-06-13 2022-06-09 S Sale
2.2
Raza Adnan

EVP, FINANCE AND CFO

Officer
2,166 -1.6%
23.47
US$50,835 		2,166 -1.6% 23.47 US$50,835
2022-03-17 2022-03-15 S Sale
3.5
Zhang Shuo
Non-Executive Director
11,017 -51.5%
25.50
US$280,934 		11,017 -51.5% 25.50 US$280,934
2022-02-25 2022-02-23 S Sale
MICHAELS KIMON

EVP OF PRODUCTS AND SOLUTIONS

Executive Director
8,850
0.00
US$0 		8,850 0.00 US$0
2021-11-15 2021-11-12 S Sale
3.1
GUSTAFSON MICHAEL B
Non-Executive Director
3,000 -9.8%
33.00
US$98,992 		3,000 -9.8% 33.00 US$98,992
2020-11-23 2020-11-20 S Sale
1.8
Yin Gerald Zheyao
Non-Executive Director
8,678 -44.0%
21.18
US$183,800 		8,678 -44.0% 21.18 US$183,800
2019-11-07 2019-11-06 S Sale
3.1
GUSTAFSON MICHAEL B
2,214 -9.4%
15.75
US$34,870 		2,214 -9.4% 15.75 US$34,870
2019-11-07 2019-11-05 S Sale
3.1
GUSTAFSON MICHAEL B
386 -1.6%
15.97
US$6,164 		386 -1.6% 15.97 US$6,164
2019-06-14 2019-06-13 S Sale
3.1
GUSTAFSON MICHAEL B
1,000 -4.9%
12.95
US$12,949 		1,000 -4.9% 12.95 US$12,949
2017-08-21 2017-08-18 S Sale LANZA LUCIO
60,000 -15.8%
15.00
US$900,156 		60,000 -15.8% 15.00 US$900,156
2017-06-13 2017-06-09 S Sale LANZA LUCIO
45,000 -10.6%
17.57
US$790,592 		45,000 -10.6% 17.57 US$790,592
2017-05-26 2017-05-24 S Sale LANZA LUCIO Non-Executive Director
30,000 -8.6%
16.50
US$495,096 		30,000 -8.6% 16.50 US$495,096
2017-05-22 2017-05-18 S Sale LANZA LUCIO Non-Executive Director
15,000 -4.5%
16.61
US$249,174 		15,000 -4.5% 16.61 US$249,174
2017-02-21 2017-02-17 S Sale HARTGRING CORNELIS

Vice President, CSS

Officer
981
0.00
US$0 		981 0.00 US$0
2017-02-21 2017-02-16 S Sale HARTGRING CORNELIS

Vice President, CSS

Officer
17,952
0.00
US$0 		17,952 0.00 US$0
2016-12-07 2016-12-06 S Sale Kim KwangH

VP of Business Development

Officer
6,000 -100.0%
21.91
US$131,486 		6,000 -100.0% 21.91 US$131,486
2016-12-05 2016-12-01 S Sale Kim KwangH

VP of Business Development

Officer
6,000 -50.0%
23.00
US$138,015 		6,000 -50.0% 23.00 US$138,015
2016-11-09 2016-11-08 S Sale WALKER GREGORY C

CFO, VP Finance

Officer
6,229 -30.8%
19.85
US$123,646 		6,229 -30.8% 19.85 US$123,646
2016-09-13 2016-09-12 S Sale WALKER GREGORY C

CFO, VP Finance

Officer
2,665 -11.5%
15.90
US$42,376 		2,665 -11.5% 15.90 US$42,376
2016-08-10 2016-08-09 PlS Planned sale WALKER GREGORY C

CFO, VP Finance

Officer
2,382 -9.3%
17.00
US$40,500 		2,382 -9.3% 17.00 US$40,500
2016-08-03 2016-08-03 S Sale HARTGRING CORNELIS

Vice President, CSS

Officer
1,600 -4.2%
16.67
US$26,672 		1,600 -4.2% 16.67 US$26,672
2016-08-03 2016-08-02 PlS Planned sale HARTGRING CORNELIS

Vice President, CSS

Officer
14,031 -26.9%
16.66
US$233,803 		14,031 -26.9% 16.66 US$233,803
2016-06-01 2016-05-27 B Purchase HEINRICHS R STEPHEN Non-Executive Director
6,118 +46.0%
14.24
US$87,095 		6,118 +46.0% 14.24 US$87,095
2015-06-15 2015-06-12 S Sale HEINRICHS R STEPHEN Non-Executive Director
29,093 -60.3%
16.49
US$479,773 		29,093 -60.3% 16.49 US$479,773
2015-06-15 2015-06-11 S Sale HEINRICHS R STEPHEN Non-Executive Director
5,907 -23.5%
16.40
US$96,881 		5,907 -23.5% 16.40 US$96,881
2015-03-06 2015-03-05 S Sale Kim KwangH

VP of Business Development

Officer
18 -100.0%
14,900.00
US$267,902 		18 -100.0% 14,900.00 US$267,902
2015-02-27 2015-02-27 S Sale Kim KwangH

VP of Business Development

Officer
100 -0.7%
18.68
US$1,868 		100 -0.7% 18.68 US$1,868
2015-02-25 2015-02-23 S Sale WALKER GREGORY C

CFO, VP Finance

Officer
117,401 -89.1%
17.52
US$2,056,866 		117,401 -89.1% 17.52 US$2,056,866
2015-02-20 2015-02-20 S Sale WALKER GREGORY C

CFO, VP Finance

Officer
9,006 -38.6%
17.75
US$159,856 		9,006 -38.6% 17.75 US$159,856
2015-02-20 2015-02-19 S Sale WALKER GREGORY C

CFO, VP Finance

Officer
18 -0.1%
12,343.00
US$219,088 		18 -0.1% 12,343.00 US$219,088
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