Gregg Piontek

CIK 1418328 · View on SEC EDGAR ↗

Insider

First SEC filing: June 3, 2026 · Latest: June 3, 2026

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Insider transactions

0 buys (P) 1 sells (S) Net: $-225,450 + 93 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

93 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
March 25, 2026 NPKI S 10b5-1 15,000 $15.03 $225,450 869,326 Direct -1.70% Disposed -7.7% (price as of 2026-08-20)
Aug. 5, 2022 NPKI P 10,000 $2.55 $25,500 65,000 Indirect +18.18% Acquired 443.9% (price as of 2026-08-20)
Nov. 11, 2020 NPKI P 15,000 $1.08 $16,200 55,000 Indirect +37.50% Acquired 1184.3% (price as of 2026-08-20)
May 12, 2020 NPKI P 15,000 $1.64 $24,600 40,000 Indirect +60.00% Acquired 745.7% (price as of 2026-08-20)
May 11, 2020 NPKI P 5,000 $1.58 $7,900 25,000 Indirect +25.00% Acquired 777.8% (price as of 2026-08-20)
May 8, 2020 NPKI P 20,000 $1.47 $29,400 20,000 Indirect — Acquired 843.5% (price as of 2026-08-20)
May 2, 2018 NPKI S 51,490 $10.51 $541,160 119,863 Direct -30.05% Disposed 32.0% (price as of 2026-08-20)

Showing latest 100 of 178 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date Ticker Security Underlying Exercise price Expiration Shares A/D
June 1, 2025 NPKI Restricted Stock Units Common Stock (40,379) — — 40,379 Disposed
June 1, 2025 NPKI Restricted Stock Units Common Stock (43,790) — — 43,790 Disposed
June 1, 2024 NPKI Restricted Stock Units Common Stock (40,380) — — 40,380 Disposed
June 1, 2024 NPKI Restricted Stock Units Common Stock (43,790) — — 43,790 Disposed
June 1, 2024 NPKI Restricted Stock Units Common Stock (51,181) — — 51,181 Disposed
June 2, 2023 NPKI Restricted Stock Units Common Stock (51,182) — — 51,182 Disposed
June 1, 2023 NPKI Restricted Stock Units Common Stock (47,432) — — 47,432 Disposed
June 1, 2023 NPKI Restricted Stock Units Common Stock (43,791) — — 43,791 Disposed
May 18, 2023 NPKI Restricted Stock Units Common Stock (121,138) $0.00 — 121,138 Acquired
June 1, 2022 NPKI Restricted Stock Units Common Stock (51,182) — — 51,182 Disposed
June 1, 2022 NPKI Restricted Stock Units Common Stock (47,433) — — 47,433 Disposed
June 1, 2022 NPKI Restricted Stock Units Common Stock (23,096) — — 23,096 Disposed
June 1, 2022 NPKI Restricted Stock Units Common Stock (50,000) — — 50,000 Disposed
May 19, 2022 NPKI Restricted Stock Units Common Stock (131,371) $0.00 — 131,371 Acquired
May 19, 2022 NPKI Restricted Stock Units Common Stock (132,090) $0.00 — 132,090 Acquired
June 1, 2021 NPKI Restricted Stock Units Common Stock (14,649) — — 14,649 Disposed
June 1, 2021 NPKI Restricted Stock Units Common Stock (23,096) — — 23,096 Disposed
June 1, 2021 NPKI Restricted Stock Units Common Stock (47,433) — — 47,433 Disposed
May 20, 2021 NPKI Restricted Stock Units Common Stock (153,545) $0.00 — 153,545 Acquired
June 1, 2020 NPKI Restricted Stock Units Common Stock (23,096) — — 23,096 Disposed
June 1, 2020 NPKI Restricted Stock Units Common Stock (14,649) — — 14,649 Disposed
June 1, 2020 NPKI Restricted Stock Units Common Stock (50,000) — — 50,000 Disposed
June 1, 2020 NPKI Restricted Stock Units Common Stock (14,807) — — 14,807 Disposed
May 21, 2020 NPKI Restricted Stock Units Common Stock (142,298) $0.00 — 142,298 Acquired
July 2, 2019 NPKI Performance Shares Common Stock (41,922) $0.00 — 41,922 Disposed
June 1, 2019 NPKI Restricted Stock Units Common Stock (14,650) — — 14,650 Disposed
June 1, 2019 NPKI Restricted Stock Units Common Stock (14,808) — — 14,808 Disposed
June 1, 2019 NPKI Restricted Stock Units Common Stock (22,308) — — 22,308 Disposed
May 23, 2019 NPKI Restricted Stock Units Common Stock (69,288) $0.00 — 69,288 Acquired
Aug. 14, 2018 NPKI Performance Shares Common Stock (24,481) $0.00 — 24,481 Disposed
June 1, 2018 NPKI Restricted Stock Units Common Stock (22,308) — — 22,308 Disposed
June 1, 2018 NPKI Restricted Stock Units Common Stock (14,808) — — 14,808 Disposed
June 1, 2018 NPKI Restricted Stock Units Common Stock (12,161) — — 12,161 Disposed
May 16, 2018 NPKI Restricted Stock Units Common Stock (100,000) $0.00 — 100,000 Acquired
May 16, 2018 NPKI Restricted Stock Units Common Stock (43,948) $0.00 — 43,948 Acquired
May 2, 2018 NPKI Non-Qualified Stock Option (right to buy) Common Stock (28,100) $7.89 June 10, 2018 28,100 Disposed
May 2, 2018 NPKI Non-Qualified Stock Option (right to buy) Common Stock (23,390) $3.31 June 10, 2019 23,390 Disposed
Aug. 16, 2017 NPKI Performance Shares Common Stock (19,819) $0.00 — 19,819 Disposed
June 1, 2017 NPKI Restricted Stock Units Common Stock (22,308) — — 22,308 Disposed
June 1, 2017 NPKI Restricted Stock Units Common Stock (12,162) — — 12,162 Disposed
May 18, 2017 NPKI Restricted Stock Units Common Stock (44,423) $0.00 — 44,423 Acquired
Aug. 10, 2016 NPKI Performance Shares Common Stock (17,584) $0.00 — 17,584 Disposed
June 1, 2016 NPKI Restricted Stock Units Common Stock (12,162) — — 12,162 Disposed
May 19, 2016 NPKI Restricted Stock Units Common Stock (66,924) $0.00 — 66,924 Acquired
May 19, 2016 NPKI Performance Shares Common Stock (41,922) $0.00 — 41,922 Acquired
May 19, 2016 NPKI Non-Qualified Stock Option (right to buy) Common Stock (73,590) $4.32 May 19, 2026 73,590 Acquired
May 22, 2015 NPKI Restricted Stock Units Common Stock (36,485) $0.00 — 36,485 Acquired
May 22, 2015 NPKI Performance Shares Common Stock (24,481) $0.00 — 24,481 Acquired
May 22, 2015 NPKI Non-Qualified Stock Option (right to buy) Common Stock (41,945) $9.00 May 21, 2025 41,945 Acquired
May 21, 2014 NPKI Performance Shares Common Stock (19,819) $0.00 — 19,819 Acquired
May 21, 2014 NPKI Non-Qualified Stock Option (right to buy) Common Stock (33,365) $11.20 May 21, 2024 33,365 Acquired
June 6, 2013 NPKI Performance Shares Common Stock (17,584) $0.00 — 17,584 Acquired
June 6, 2013 NPKI Non-Qualified Stock Option (right to buy) Common Stock (28,336) $11.43 June 6, 2023 28,336 Acquired
May 14, 2013 NPKI Non-Qualified Stock Option (right to buy) Common Stock (30,000) $3.31 June 10, 2019 30,000 Disposed
June 6, 2012 NPKI Non-Qualified Stock Option (right to buy) Common Stock (83,171) $5.57 June 6, 2022 83,171 Acquired
June 9, 2011 NPKI Non-Qualified Stock Option (right to buy) Common Stock (19,246) $9.13 June 9, 2021 19,246 Acquired
June 10, 2009 NPKI Stock Option Common Stock (53,390) $3.31 June 10, 2019 53,390 Acquired
June 10, 2008 NPKI Stock Option Common Stock (28,100) $7.89 June 10, 2018 28,100 Acquired
June 12, 2007 NPKI Stock Option Common Stock (20,000) $7.82 June 11, 2017 20,000 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

NPKI

Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2014 $360,125 — $497,466 $165,887 $303,323 — $29,070 $1,355,871
2013 $326,250 — $461,099 $153,680 $207,598 — $30,145 $1,178,772
2012 $300,000 — $239,995 $239,990 $88,263 — $30,000 $898,248

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.