Diana J Walters

Insider

First SEC filing: Dec. 27, 2024 · Latest: Dec. 27, 2024

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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 + 18 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

18 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 29, 2026	SMR	A	8,681	—	—	20,976 Direct	+70.61%	Acquired	(price as of 2026-08-21)
Feb. 5, 2025	ATO	M	1,293	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 5, 2025	ATO	C	4,456	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
Feb. 5, 2025	ATO	M	1,293	$144.69	$187,084	9,300 Direct	+16.15%	Acquired	17.0% (price as of 2026-08-21)
Feb. 5, 2025	ATO	C	4,456	$144.69	$644,739	8,007 Direct	+125.49%	Acquired	17.0% (price as of 2026-08-21)
May 16, 2024	ATO	S	400	$118.00	$47,200	3,551 Direct	-10.12%	Disposed	43.5% (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 8, 2024	ATO	M	1,367	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 8, 2024	ATO	M	1,367	$115.96	$158,517	3,951 Direct	+52.90%	Acquired	46.0% (price as of 2026-08-21)
May 5, 2023	ATO	S	390	$117.50	$45,825	2,584 Direct	-13.11%	Disposed	44.1% (price as of 2026-08-21)
March 10, 2023	ATO	A	1,367	$109.72	$149,987	1,367 Direct	—	Acquired	54.3% (price as of 2026-08-21)
March 10, 2023	ATO	M	1,322	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 10, 2023	ATO	M	1,322	$109.72	$145,050	2,974 Direct	+80.02%	Acquired	54.3% (price as of 2026-08-21)
March 11, 2022	ATO	A	1,322	$113.40	$149,915	1,322 Direct	—	Acquired	49.3% (price as of 2026-08-21)
March 4, 2022	ATO	M	1,652	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
March 4, 2022	ATO	M	1,652	$114.38	$188,956	1,652 Direct	—	Acquired	48.1% (price as of 2026-08-21)
March 5, 2021	ATO	A	1,652	$90.79	$149,985	1,652 Direct	—	Acquired	86.5% (price as of 2026-08-21)
March 6, 2020	ATO	A	1,375	$109.09	$149,999	3,937 Direct	+53.67%	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.

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. 5, 2025	ATO	Restricted Stock Unit	Common Stock (1,293)	—	—	1,293	Disposed
Feb. 5, 2025	ATO	Phantom Stock Units	Common Stock (4,456)	—	—	4,456	Disposed
March 8, 2024	ATO	Restricted Stock Unit	Common Stock (1,293)	—	—	1,293	Acquired
March 8, 2024	ATO	Restricted Stock Unit	Common Stock (1,367)	—	—	1,367	Disposed
March 10, 2023	ATO	Restricted Stock Unit	Common Stock (1,367)	—	—	1,367	Acquired
March 10, 2023	ATO	Restricted Stock Unit	Common Stock (1,322)	—	—	1,322	Disposed
March 11, 2022	ATO	Restricted Stock Unit	Common Stock (1,322)	—	—	1,322	Acquired
March 4, 2022	ATO	Restricted Stock Unit	Common Stock (1,652)	—	—	1,652	Disposed
March 5, 2021	ATO	Restricted Stock Unit	Common Stock (1,652)	—	—	1,652	Acquired
March 6, 2020	ATO	Phantom Stock Units	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).

Initial ownership (Form 3) 5 holdings

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

Date	Ticker	Security	Shares	Ownership
Dec. 27, 2024	SMR	Class A Common Stock	1,200	Indirect
Dec. 27, 2024	SMR	Class A Common Stock	1,200	Direct
Dec. 27, 2024	SMR	Restricted Stock Unit→ Class A Common Stock (5,563)	5,563	Direct
Dec. 27, 2024	SMR	Restricted Stock Unit→ Class A Common Stock (2,423)	2,423	Direct
Feb. 23, 2016	PR	Class B Common Stock, par value $0.0001 per share→ Class A Common Stock, par value $0.0001 per share	—	Direct