THALMAN WILLIAM M

Insider

First SEC filing: March 9, 2026 · Latest: March 9, 2026

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.
Initial holdings The stakes this person held when they first started reporting.

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 47 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

47 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 1, 2026	FSTR	A	1,128	—	—	79,882 Direct	+1.43%	Acquired	(price as of 2026-08-20)
May 22, 2026	FSTR	F	1,178	$38.11	$44,894	78,754 Direct	-1.47%	Disposed	-1.5% (price as of 2026-08-20)
Feb. 19, 2026	FSTR	F	11,746	$31.12	$365,536	79,932 Direct	-12.81%	Disposed	20.7% (price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	6,297	—	—	91,678 Direct	+7.38%	Acquired	(price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	1,358	—	—	85,381 Direct	+1.62%	Acquired	(price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	3,651	—	—	84,023 Direct	+4.54%	Acquired	(price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	8,365	—	—	80,372 Direct	+11.62%	Acquired	(price as of 2026-08-20)
Feb. 19, 2026	FSTR	F	11,746	$31.12	$365,536	79,947 Direct	-12.81%	Disposed	20.7% (price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	6,297	—	—	91,693 Direct	+7.37%	Acquired	(price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	1,358	—	—	85,396 Direct	+1.62%	Acquired	(price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	3,651	—	—	84,038 Direct	+4.54%	Acquired	(price as of 2026-08-20)
Feb. 19, 2026	FSTR	A	8,365	—	—	80,387 Direct	+11.61%	Acquired	(price as of 2026-08-20)
Feb. 14, 2026	FSTR	F	1,736	$31.63	$54,910	72,007 Direct	-2.35%	Disposed	18.7% (price as of 2026-08-20)
Feb. 14, 2026	FSTR	F	1,721	$31.63	$54,435	72,022 Direct	-2.33%	Disposed	18.7% (price as of 2026-08-20)
Feb. 14, 2026	FSTR	F	1,721	$31.63	$54,435	72,010 Direct	-2.33%	Disposed	18.7% (price as of 2026-08-20)
Feb. 13, 2026	FSTR	F	1,007	$31.63	$31,851	73,743 Direct	-1.35%	Disposed	18.7% (price as of 2026-08-20)
Feb. 13, 2026	FSTR	F	1,007	$31.63	$31,851	73,743 Direct	-1.35%	Disposed	18.7% (price as of 2026-08-20)
Feb. 13, 2026	FSTR	F	1,007	$31.63	$31,851	73,731 Direct	-1.35%	Disposed	18.7% (price as of 2026-08-20)
Feb. 11, 2026	FSTR	M	1,667	$31.54	$52,577	0 Direct	-100.00%	Disposed	19.1% (price as of 2026-08-20)
Feb. 11, 2026	FSTR	F	817	$31.54	$25,768	74,750 Direct	-1.08%	Disposed	19.1% (price as of 2026-08-20)
Feb. 11, 2026	FSTR	M	1,667	—	—	75,567 Direct	+2.26%	Acquired	(price as of 2026-08-20)
Feb. 11, 2026	FSTR	M	1,667	$31.54	$52,577	0 Direct	-100.00%	Disposed	19.1% (price as of 2026-08-20)
Feb. 11, 2026	FSTR	F	829	$31.54	$26,147	74,738 Direct	-1.10%	Disposed	19.1% (price as of 2026-08-20)
Feb. 11, 2026	FSTR	M	1,667	—	—	75,567 Direct	+2.26%	Acquired	(price as of 2026-08-20)
May 23, 2025	FSTR	F	898	$18.18	$16,326	73,900 Direct	-1.20%	Disposed	106.5% (price as of 2026-08-20)
May 22, 2025	FSTR	A	8,085	—	—	74,798 Direct	+12.12%	Acquired	(price as of 2026-08-20)
Feb. 20, 2025	FSTR	F	4,884	$27.65	$135,043	66,713 Direct	-6.82%	Disposed	35.8% (price as of 2026-08-20)
Feb. 20, 2025	FSTR	A	2,385	—	—	71,597 Direct	+3.45%	Acquired	(price as of 2026-08-20)
Feb. 20, 2025	FSTR	A	8,577	—	—	69,212 Direct	+14.15%	Acquired	(price as of 2026-08-20)
Feb. 20, 2025	FSTR	A	4,786	—	—	60,635 Direct	+8.57%	Acquired	(price as of 2026-08-20)
Feb. 17, 2025	FSTR	F	1,027	$27.50	$28,242	55,849 Direct	-1.81%	Disposed	36.5% (price as of 2026-08-20)
Feb. 14, 2025	FSTR	F	1,930	$27.50	$53,075	56,876 Direct	-3.28%	Disposed	36.5% (price as of 2026-08-20)
Aug. 8, 2024	FSTR	P	2,500	$16.79	$41,975	58,806 Direct	+4.44%	Acquired	123.6% (price as of 2026-08-20)
May 23, 2024	FSTR	A	6,163	—	—	56,306 Direct	+12.29%	Acquired	(price as of 2026-08-20)
April 5, 2024	FSTR	M	1,666	$27.17	$45,265	1,667 Direct	-49.98%	Disposed	38.2% (price as of 2026-08-20)
April 5, 2024	FSTR	F	715	$27.17	$19,427	50,143 Direct	-1.41%	Disposed	38.2% (price as of 2026-08-20)
April 5, 2024	FSTR	M	1,666	—	—	50,858 Direct	+3.39%	Acquired	(price as of 2026-08-20)
March 1, 2024	FSTR	F	2,164	$23.78	$51,460	49,192 Direct	-4.21%	Disposed	57.9% (price as of 2026-08-20)
Feb. 26, 2024	FSTR	F	842	$23.40	$19,703	51,356 Direct	-1.61%	Disposed	60.5% (price as of 2026-08-20)
Feb. 17, 2024	FSTR	F	985	$24.00	$23,640	52,198 Direct	-1.85%	Disposed	56.5% (price as of 2026-08-20)
Feb. 14, 2024	FSTR	F	1,847	$24.00	$44,328	53,183 Direct	-3.36%	Disposed	56.5% (price as of 2026-08-20)
Feb. 13, 2024	FSTR	A	9,942	—	—	55,030 Direct	+22.05%	Acquired	(price as of 2026-08-20)
Feb. 13, 2024	FSTR	A	3,874	—	—	45,088 Direct	+9.40%	Acquired	(price as of 2026-08-20)
Feb. 13, 2024	FSTR	F	1,144	$23.76	$27,181	41,214 Direct	-2.70%	Disposed	58.0% (price as of 2026-08-20)
Feb. 13, 2024	FSTR	A	2,377	—	—	42,358 Direct	+5.95%	Acquired	(price as of 2026-08-20)
March 1, 2023	FSTR	F	2,144	$12.46	$26,714	39,981 Direct	-5.09%	Disposed	201.4% (price as of 2026-08-20)
Feb. 26, 2023	FSTR	F	842	$12.80	$10,778	42,125 Direct	-1.96%	Disposed	193.4% (price as of 2026-08-20)
Aug. 22, 2003	WCC	A	10,000	$5.90	$59,000	10,000 Direct	—	Acquired	5625.6% (price as of 2026-08-20)

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
Feb. 11, 2026	FSTR	Performance Stock Units	Common Stock (1,667)	—	Feb. 28, 2026	1,667	Disposed
Feb. 11, 2026	FSTR	Performance Stock Units	Common Stock (1,667)	—	Feb. 28, 2026	1,667	Disposed
April 5, 2024	FSTR	Performance Stock Units	Common Stock (1,666)	—	Feb. 28, 2026	1,666	Disposed
Aug. 22, 2003	WCC	Option for WESCO International Common Stock	WESCO International Common Stock (10,000)	$5.90	Aug. 22, 2013	10,000	Acquired

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

Initial ownership (Form 3) 1 holding

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
March 2, 2021	FSTR	Common Stock, $1.00 par value per share	0	Direct