David J Park

Insider

First SEC filing: Jan. 13, 2017 · Latest: Jan. 13, 2017

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.
Compensation Executive pay disclosed in company proxy statements.

Insider at

ATO selling Nov. 11, 2019

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 45 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

45 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 4, 2021	ATO	A	3,215	$103.49	$332,720	8,710 Direct	+58.51%	Acquired	66.2% (price as of 2026-08-20)
May 1, 2021	ATO	M	3,000	—	—	5,495 Direct	-35.31%	Disposed	(price as of 2026-08-20)
May 1, 2021	ATO	F	1,026	$102.88	$105,555	16,886 Direct	-5.73%	Disposed	67.2% (price as of 2026-08-20)
May 1, 2021	ATO	M	3,000	$102.88	$308,640	17,912 Direct	+20.12%	Acquired	67.2% (price as of 2026-08-20)
Dec. 29, 2020	ATO	G	217	—	—	14,912 Direct	-1.43%	Disposed	(price as of 2026-08-20)
Nov. 11, 2020	ATO	F	1,273	$101.25	$128,891	15,129 Direct	-7.76%	Disposed	69.9% (price as of 2026-08-20)
Nov. 11, 2020	ATO	M	3,704	$101.25	$375,030	16,402 Direct	+29.17%	Acquired	69.9% (price as of 2026-08-20)
Nov. 6, 2020	ATO	M	1,503	—	—	8,495 Direct	-15.03%	Disposed	(price as of 2026-08-20)
Nov. 6, 2020	ATO	F	518	$94.51	$48,956	12,698 Direct	-3.92%	Disposed	82.0% (price as of 2026-08-20)
Nov. 6, 2020	ATO	M	1,503	$94.51	$142,049	13,216 Direct	+12.83%	Acquired	82.0% (price as of 2026-08-20)
May 5, 2020	ATO	A	2,610	$102.03	$266,298	9,998 Direct	+35.33%	Acquired	68.6% (price as of 2026-08-20)
May 1, 2020	ATO	M	2,525	—	—	7,388 Direct	-25.47%	Disposed	(price as of 2026-08-20)
May 1, 2020	ATO	F	864	$99.97	$86,374	11,716 Direct	-6.87%	Disposed	72.1% (price as of 2026-08-20)
May 1, 2020	ATO	M	2,525	$99.97	$252,424	12,580 Direct	+25.11%	Acquired	72.1% (price as of 2026-08-20)
Nov. 11, 2019	ATO	S	4,000	$106.92	$427,680	10,055 Direct	-28.46%	Disposed	60.9% (price as of 2026-08-20)
Nov. 8, 2019	ATO	M	443	—	—	9,913 Direct	-4.28%	Disposed	(price as of 2026-08-20)
Nov. 8, 2019	ATO	F	153	$107.66	$16,472	14,055 Direct	-1.08%	Disposed	59.8% (price as of 2026-08-20)
Nov. 8, 2019	ATO	M	443	$107.66	$47,693	14,208 Direct	+3.22%	Acquired	59.8% (price as of 2026-08-20)
Nov. 5, 2019	ATO	F	1,302	$108.40	$141,137	13,831 Direct	-8.60%	Disposed	58.7% (price as of 2026-08-20)
Nov. 5, 2019	ATO	M	3,788	$108.40	$410,619	15,133 Direct	+33.39%	Acquired	58.7% (price as of 2026-08-20)
May 7, 2019	ATO	A	2,885	—	—	10,356 Direct	+38.62%	Acquired	(price as of 2026-08-20)
May 4, 2019	ATO	M	975	—	—	7,471 Direct	-11.54%	Disposed	(price as of 2026-08-20)
May 4, 2019	ATO	F	331	$102.47	$33,918	11,210 Direct	-2.87%	Disposed	67.9% (price as of 2026-08-20)
May 4, 2019	ATO	M	975	$102.47	$99,908	11,541 Direct	+9.23%	Acquired	67.9% (price as of 2026-08-20)
Nov. 6, 2018	ATO	F	462	$94.18	$43,511	10,566 Direct	-4.19%	Disposed	82.6% (price as of 2026-08-20)
Nov. 6, 2018	ATO	M	1,343	$94.18	$126,484	11,028 Direct	+13.87%	Acquired	82.6% (price as of 2026-08-20)
Nov. 2, 2018	ATO	M	1,130	—	—	8,446 Direct	-11.80%	Disposed	(price as of 2026-08-20)
Nov. 2, 2018	ATO	F	389	$92.21	$35,870	9,685 Direct	-3.86%	Disposed	86.5% (price as of 2026-08-20)
Nov. 2, 2018	ATO	M	1,130	$92.21	$104,197	10,074 Direct	+12.63%	Acquired	86.5% (price as of 2026-08-20)
May 5, 2018	ATO	M	1,080	—	—	9,576 Direct	-10.14%	Disposed	(price as of 2026-08-20)
May 5, 2018	ATO	F	419	$88.86	$37,232	8,944 Direct	-4.48%	Disposed	93.6% (price as of 2026-08-20)
May 5, 2018	ATO	M	1,080	$88.86	$95,969	9,363 Direct	+13.04%	Acquired	93.6% (price as of 2026-08-20)
May 5, 2018	ATO	M	1,080	—	—	9,576 Direct	-10.14%	Disposed	(price as of 2026-08-20)
May 5, 2018	ATO	F	419	$88.86	$37,232	8,944 Direct	-4.48%	Disposed	93.6% (price as of 2026-08-20)
May 5, 2018	ATO	M	1,080	$88.86	$95,969	9,363 Direct	+13.04%	Acquired	93.6% (price as of 2026-08-20)
May 1, 2018	ATO	A	3,000	—	—	10,656 Direct	+39.18%	Acquired	(price as of 2026-08-20)
Nov. 7, 2017	ATO	A	1,503	—	—	7,656 Direct	+24.43%	Acquired	(price as of 2026-08-20)
Nov. 7, 2017	ATO	F	718	$88.24	$63,356	8,283 Direct	-7.98%	Disposed	94.9% (price as of 2026-08-20)
Nov. 7, 2017	ATO	M	1,710	$88.24	$150,890	9,001 Direct	+23.45%	Acquired	94.9% (price as of 2026-08-20)
Nov. 3, 2017	ATO	M	664	—	—	6,153 Direct	-9.74%	Disposed	(price as of 2026-08-20)
Nov. 3, 2017	ATO	F	279	$87.06	$24,290	7,291 Direct	-3.69%	Disposed	97.6% (price as of 2026-08-20)
Nov. 3, 2017	ATO	M	664	$87.06	$57,808	7,570 Direct	+9.61%	Acquired	97.6% (price as of 2026-08-20)
May 6, 2017	ATO	M	760	—	—	6,817 Direct	-10.03%	Disposed	(price as of 2026-08-20)
May 6, 2017	ATO	F	315	$81.90	$25,798	6,906 Direct	-4.36%	Disposed	110.0% (price as of 2026-08-20)
May 6, 2017	ATO	M	760	$81.90	$62,244	7,221 Direct	+11.76%	Acquired	110.0% (price as of 2026-08-20)
May 2, 2017	ATO	A	2,525	—	—	7,577 Direct	+49.98%	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.

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
May 4, 2021	ATO	Restricted Stock Unit	Common Stock (3,215)	—	—	3,215	Acquired
May 1, 2021	ATO	Restricted Stock Unit	Common Stock (3,000)	—	—	3,000	Disposed
Nov. 6, 2020	ATO	Restricted Stock Unit	Common Stock (1,503)	—	—	1,503	Disposed
May 5, 2020	ATO	Restricted Stock Unit	Common Stock (2,610)	—	—	2,610	Acquired
May 1, 2020	ATO	Restricted Stock Unit	Common Stock (2,525)	—	—	2,525	Disposed
Nov. 8, 2019	ATO	Restricted Stock Unit	Common Stock (443)	—	—	443	Disposed
May 7, 2019	ATO	Restricted Stock Unit	Common Stock (2,885)	—	—	2,885	Acquired
May 4, 2019	ATO	Restricted Stock Unit	Common Stock (975)	—	—	975	Disposed
Nov. 2, 2018	ATO	Restricted Stock Unit	Common Stock (1,130)	—	—	1,130	Disposed
May 5, 2018	ATO	Restricted Stock Unit	Common Stock (1,080)	—	—	1,080	Disposed
May 5, 2018	ATO	Restricted Stock Unit	Common Stock (1,080)	—	—	1,080	Disposed
May 1, 2018	ATO	Restricted Stock Unit	Common Stock (3,000)	—	—	3,000	Acquired
Nov. 7, 2017	ATO	Restricted Stock Unit	Common Stock (1,503)	—	—	1,503	Acquired
Nov. 3, 2017	ATO	Restricted Stock Unit	Common Stock (664)	—	—	664	Disposed
May 6, 2017	ATO	Restricted Stock Unit	Common Stock (760)	—	—	760	Disposed
May 2, 2017	ATO	Restricted Stock Unit	Common Stock (2,525)	—	—	2,525	Acquired

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

Initial ownership (Form 3) 3 holdings

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

Date	Ticker	Security	Shares	Ownership
Jan. 13, 2017	ATO	Common Stock	6,461	Direct
Jan. 13, 2017	ATO	Common Stock	2,384	Indirect
Jan. 13, 2017	ATO	Restricted Stock Unit→ Common Stock (5,052)	5,052	Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

ATO

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2021	$464,694	—	—	—	$278,816	$76,305	$203,192	$1,688,448
2020	$446,512	—	—	—	$267,907	$256,764	$210,335	$1,714,115
2018	$373,154	—	—	—	$298,516	$173,678	$12,577	$1,400,153

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.