Thomas T Dierdorff

CIK 1906875 · View on SEC EDGAR ↗

Insider

First SEC filing: Jan. 2, 2026 · Latest: Jan. 2, 2026

On this page

Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.

Insider transactions

1 buys (P) 1 sells (S) Net: $186 + 22 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

22 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D
Jan. 1, 2026	18349	D	21,745	—	—	0	—	—
Aug. 28, 2025	18349	P	6,200	$50.56	$313,472	20,954 Direct	+42.02%	Acquired
Aug. 28, 2025	18349	S	6,200	$50.53	$313,286	14,754 Direct	-29.59%	Disposed
Feb. 19, 2025	18349	M	6,009	—	—	0 Direct	-100.00%	Disposed
Feb. 19, 2025	18349	F	4,338	$55.22	$239,544	20,954 Direct	-17.15%	Disposed
Feb. 19, 2025	18349	A	3,687	$55.22	$203,596	25,292 Direct	+17.07%	Acquired
Feb. 19, 2025	18349	M	6,009	$55.22	$331,817	21,605 Direct	+38.53%	Acquired
Feb. 18, 2025	18349	F	2,460	$54.47	$133,996	15,596 Direct	-13.62%	Disposed
Feb. 13, 2025	18349	A	5,783	—	—	5,783 Direct	—	Acquired
Feb. 13, 2025	18349	A	3,856	$54.47	$210,036	17,327 Direct	+28.62%	Acquired
Jan. 28, 2025	18349	P	1,680	$55.03	$92,450	13,471 Direct	+14.25%	Acquired
Jan. 28, 2025	18349	S	1,680	$55.03	$92,450	11,791 Direct	-12.47%	Disposed
Jan. 2, 2025	18349	F	11	$50.84	$559	13,471 Direct	-0.08%	Disposed
Dec. 21, 2024	18349	F	1,351	$49.68	$67,118	13,482 Direct	-9.11%	Disposed
Oct. 22, 2024	18349	P	1,841	$48.86	$89,951	14,833 Direct	+14.17%	Acquired
Oct. 22, 2024	18349	S	1,841	$48.80	$89,841	12,992 Direct	-12.41%	Disposed
July 24, 2024	18349	S	614	$46.20	$28,367	14,833 Direct	-3.97%	Disposed
Feb. 16, 2024	18349	F	1,575	$36.72	$57,834	15,447 Direct	-9.25%	Disposed
Feb. 15, 2024	18349	A	8,579	—	—	8,579 Direct	—	Acquired
Feb. 15, 2024	18349	A	5,719	$36.72	$210,002	16,833 Direct	+51.46%	Acquired
Jan. 23, 2024	18349	S	2,045	$38.23	$78,180	11,086 Direct	-15.57%	Disposed
Jan. 3, 2024	18349	F	10	$37.52	$375	13,131 Direct	-0.08%	Disposed
Dec. 21, 2023	18349	F	874	$37.24	$32,548	13,141 Direct	-6.24%	Disposed
Feb. 17, 2023	18349	F	489	$43.28	$21,164	13,678 Direct	-3.45%	Disposed
Feb. 16, 2023	18349	A	7,279	—	—	7,279 Direct	—	Acquired
Feb. 16, 2023	18349	A	4,853	$43.28	$210,038	14,167 Direct	+52.10%	Acquired
Feb. 10, 2023	18349	S	1,947	$43.36	$84,422	9,314 Direct	-17.29%	Disposed
Jan. 4, 2023	18349	F	9	$37.02	$333	11,261 Direct	-0.08%	Disposed
Dec. 21, 2022	18349	F	832	$36.05	$29,994	11,270 Direct	-6.87%	Disposed
Feb. 17, 2022	18349	A	6,009	—	—	6,009 Direct	—	Acquired
Feb. 17, 2022	18349	A	4,006	$52.43	$210,035	12,102 Direct	+49.48%	Acquired

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. 19, 2025	18349	Performance Stock Units	Common Stock (6,009)	—	Feb. 17, 2025	6,009	Disposed
Feb. 13, 2025	18349	Performance Stock Units	Common Stock (5,783)	—	Feb. 13, 2028	5,783	Acquired
Feb. 15, 2024	18349	Performance Stock Units	Common Stock (8,579)	—	Feb. 15, 2027	8,579	Acquired
Feb. 16, 2023	18349	Performance Stock Units	Common Stock (7,279)	—	Feb. 16, 2026	7,279	Acquired
Feb. 17, 2022	18349	Performance Stock Units	Common Stock (6,009)	—	Feb. 17, 2025	6,009	Acquired

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