Sean Donohue

Insider

First SEC filing: March 10, 2026 · Latest: March 10, 2026

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Insider at

0 buys (P) 1 sells (S) Net: $-77,018 + 13 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

13 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
March 6, 2026	ATO	A	920	$184.73	$169,952	9,792 Direct	+10.37%	Acquired	-8.3% (price as of 2026-08-21)
Dec. 3, 2025	ATO	S	450	$171.15	$77,018	877 Direct	-33.91%	Disposed	-1.1% (price as of 2026-08-21)
March 8, 2025	ATO	M	1,293	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 8, 2025	ATO	M	1,293	$147.75	$191,041	1,312 Direct	+6805.26%	Acquired	14.6% (price as of 2026-08-21)
March 7, 2025	ATO	A	1,083	$147.75	$160,013	8,679 Direct	+14.26%	Acquired	14.6% (price as of 2026-08-21)
March 8, 2024	ATO	A	1,293	$115.96	$149,936	1,293 Direct	—	Acquired	46.0% (price as of 2026-08-21)
March 10, 2023	ATO	A	1,367	$109.72	$149,987	7,254 Direct	+23.22%	Acquired	54.3% (price as of 2026-08-21)
March 11, 2022	ATO	A	1,323	$113.40	$150,028	5,745 Direct	+29.92%	Acquired	49.3% (price as of 2026-08-21)
Sept. 9, 2021	ATO	S	1,375	$96.83	$133,141	17 Direct	-98.78%	Disposed	74.9% (price as of 2026-08-21)
March 6, 2021	ATO	M	1,375	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 6, 2021	ATO	M	1,375	$90.79	$124,836	1,375 Direct	—	Acquired	86.5% (price as of 2026-08-21)
March 5, 2021	ATO	A	1,652	$90.79	$149,985	4,282 Direct	+62.81%	Acquired	86.5% (price as of 2026-08-21)
March 6, 2020	ATO	A	1,375	$109.09	$149,999	1,375 Direct	—	Acquired	55.2% (price as of 2026-08-21)
March 8, 2019	ATO	A	1,504	$99.73	$149,994	2,509 Direct	+149.65%	Acquired	69.8% (price as of 2026-08-21)
Nov. 30, 2018	ATO	A	1,000	$94.66	$94,660	1,000 Direct	—	Acquired	78.9% (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.

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

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
March 6, 2026	ATO	Phantom Stock Units	Common Stock (920)	—	—	920	Acquired
March 8, 2025	ATO	Restricted Stock Unit	Common Stock (1,293)	—	—	1,293	Disposed
March 7, 2025	ATO	Phantom Stock Units	Common Stock (1,083)	—	—	1,083	Acquired
March 8, 2024	ATO	Restricted Stock Unit	Common Stock (1,293)	—	—	1,293	Acquired
March 10, 2023	ATO	Phantom Stock Units	Common Stock (1,367)	—	—	1,367	Acquired
March 11, 2022	ATO	Phantom Stock Units	Common Stock (1,323)	—	—	1,323	Acquired
March 6, 2021	ATO	Restricted Stock Unit	Common Stock (1,375)	—	—	1,375	Disposed
March 5, 2021	ATO	Phantom Stock Units	Common Stock (1,652)	—	—	1,652	Acquired
March 6, 2020	ATO	Restricted Stock Unit	Common Stock (1,375)	—	—	1,375	Acquired
March 8, 2019	ATO	Phantom Stock Units	Common Stock (1,504)	—	—	1,504	Acquired
Nov. 30, 2018	ATO	Phantom Stock Units	Common Stock (1,000)	—	—	1,000	Acquired

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