William C. Kirby

Insider

First SEC filing: April 30, 2013 · Latest: April 30, 2013

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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

Insider transactions

1 buys (P) 0 sells (S) Net: $3,289,586 + 15 non-open-market transactions below Avg return of open purchases vs now: 47.6% 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

15 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Feb. 26, 2026	TWN	P	50,687	$64.90	$3,289,586	2,886 Direct	—	Acquired	47.6% (price as of 2026-08-20)
Jan. 8, 2026	CBT	A	486	—	—	27,688 Direct	+1.79%	Acquired	(price as of 2026-08-20)
Jan. 10, 2025	CBT	A	1,788	—	—	27,202 Direct	+7.04%	Acquired	(price as of 2026-08-20)
Jan. 11, 2024	CBT	A	2,035	—	—	25,414 Direct	+8.70%	Acquired	(price as of 2026-08-20)
Jan. 12, 2023	CBT	A	1,854	—	—	23,379 Direct	+8.61%	Acquired	(price as of 2026-08-20)
Jan. 13, 2022	CBT	A	2,254	—	—	21,525 Direct	+11.70%	Acquired	(price as of 2026-08-20)
Jan. 7, 2021	CBT	A	2,489	—	—	19,271 Direct	+14.83%	Acquired	(price as of 2026-08-20)
Dec. 1, 2020	TWN	P	360	$27.50	$9,900	2,105 Direct	+20.63%	Acquired	248.3% (price as of 2026-08-20)
Nov. 10, 2020	TWN	P	415	$24.45	$10,147	1,745 Direct	+31.20%	Acquired	291.8% (price as of 2026-08-20)
Jan. 9, 2020	CBT	A	2,635	—	—	16,782 Direct	+18.63%	Acquired	(price as of 2026-08-20)
Jan. 10, 2019	CBT	A	2,613	—	—	14,147 Direct	+22.65%	Acquired	(price as of 2026-08-20)
Jan. 12, 2018	CBT	A	1,636	—	—	11,534 Direct	+16.53%	Acquired	(price as of 2026-08-20)
Jan. 13, 2017	CBT	A	2,052	—	—	9,898 Direct	+26.15%	Acquired	(price as of 2026-08-20)
Jan. 8, 2016	CBT	A	1,987	—	—	7,846 Direct	+33.91%	Acquired	(price as of 2026-08-20)
Jan. 9, 2015	CBT	A	1,738	—	—	5,859 Direct	+42.17%	Acquired	(price as of 2026-08-20)
Jan. 10, 2014	CBT	A	1,451	—	—	4,121 Direct	+54.34%	Acquired	(price as of 2026-08-20)
Jan. 11, 2013	CBT	A	1,748	—	—	2,670 Direct	+189.59%	Acquired	(price as of 2026-08-20)
July 10, 2012	CBT	A	922	—	—	922 Direct	—	Acquired	(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.

Initial ownership (Form 3) 2 holdings

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

Date	Ticker	Security	Shares	Ownership
April 30, 2013	TWN	Common Stock	1,330	Direct
July 12, 2012	CBT	No securities are beneficially owned	0	Direct