Joseph G Stienessen

Insider

First SEC filing: May 14, 2013 · Latest: May 14, 2013

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Insider at

0 buys (P) 0 sells (S) Net: $0 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

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 18, 2015	NPK	P 10b5-1	417	$59.25	$24,707	1,382 Indirect	+43.21%	Acquired	156.9% (price as of 2026-08-21)
March 19, 2014	NPK	P	536	$81.09	$43,464	951 Indirect	+129.16%	Acquired	87.7% (price as of 2026-08-21)
March 19, 2014	NPK	P	14	$80.90	$1,133	965 Indirect	+1.47%	Acquired	88.2% (price as of 2026-08-21)
Nov. 18, 2013	NPK	P	52	$71.24	$3,704	52 Indirect	—	Acquired	113.7% (price as of 2026-08-21)
Nov. 18, 2013	NPK	P	100	$71.50	$7,150	152 Indirect	+192.31%	Acquired	112.9% (price as of 2026-08-21)
Nov. 18, 2013	NPK	P	263	$71.81	$18,886	415 Indirect	+173.03%	Acquired	112.0% (price as of 2026-08-21)
May 14, 2013	NPK	S	240	$77.06	$18,494	0 Direct	-100.00%	Disposed	97.5% (price as of 2026-08-21)
May 15, 2012	NPK	P	146	$68.50	$10,001	240 Direct	+155.32%	Acquired	122.2% (price as of 2026-08-21)
May 17, 2011	NPK	P	94	$106.00	$9,964	94 Direct	—	Acquired	43.6% (price as of 2026-08-21)

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.