Mitchall G. Clark

CIK 1612094 · View on SEC EDGAR ↗

Insider

First SEC filing: May 18, 2016 · Latest: May 18, 2016

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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.
Compensation Executive pay disclosed in company proxy statements.

Insider at

ATRA selling May 18, 2018

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 49 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

49 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 18, 2018	ATRA	S 10b5-1	25,860	$50.03	$1,293,776	107,972 Direct	-19.32%	Disposed	-99.2% (price as of 2026-08-20)
May 16, 2018	ATRA	S 10b5-1	300	$46.30	$13,890	133,832 Direct	-0.22%	Disposed	-99.2% (price as of 2026-08-20)
May 16, 2018	ATRA	S 10b5-1	4,347	$46.04	$200,136	134,132 Direct	-3.14%	Disposed	-99.2% (price as of 2026-08-20)
May 15, 2018	ATRA	M	4,808	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
May 15, 2018	ATRA	M	4,808	—	—	138,479 Direct	+3.60%	Acquired	(price as of 2026-08-20)
March 29, 2018	ATRA	S 10b5-1	22,400	$40.07	$897,568	133,671 Direct	-14.35%	Disposed	-99.0% (price as of 2026-08-20)
March 27, 2018	ATRA	M 10b5-1	11,406	—	—	3,125 Direct	-78.49%	Disposed	(price as of 2026-08-20)
March 27, 2018	ATRA	M 10b5-1	32,500	—	—	32,500 Direct	-50.00%	Disposed	(price as of 2026-08-20)
March 27, 2018	ATRA	M 10b5-1	28,848	—	—	11,194 Direct	-72.04%	Disposed	(price as of 2026-08-20)
March 27, 2018	ATRA	S 10b5-1	11,103	$41.10	$456,333	156,071 Direct	-6.64%	Disposed	-99.1% (price as of 2026-08-20)
March 27, 2018	ATRA	S 10b5-1	2,800	$40.40	$113,120	167,174 Direct	-1.65%	Disposed	-99.1% (price as of 2026-08-20)
March 27, 2018	ATRA	S 10b5-1	2,170	$39.53	$85,780	169,974 Direct	-1.26%	Disposed	-99.0% (price as of 2026-08-20)
March 27, 2018	ATRA	S 10b5-1	29,980	$38.23	$1,146,135	172,144 Direct	-14.83%	Disposed	-99.0% (price as of 2026-08-20)
March 27, 2018	ATRA	S 10b5-1	31,356	$37.10	$1,163,308	202,124 Direct	-13.43%	Disposed	-99.0% (price as of 2026-08-20)
March 27, 2018	ATRA	S 10b5-1	22,794	$36.43	$830,385	233,480 Direct	-8.89%	Disposed	-99.0% (price as of 2026-08-20)
March 27, 2018	ATRA	M 10b5-1	11,406	$11.00	$125,466	256,274 Direct	+4.66%	Acquired	-96.5% (price as of 2026-08-20)
March 27, 2018	ATRA	M 10b5-1	32,500	$22.72	$738,400	244,868 Direct	+15.30%	Acquired	-98.3% (price as of 2026-08-20)
March 27, 2018	ATRA	M 10b5-1	28,848	$25.15	$725,527	212,368 Direct	+15.72%	Acquired	-98.5% (price as of 2026-08-20)
Feb. 15, 2018	ATRA	M	7,211	—	—	4,808 Direct	-60.00%	Disposed	(price as of 2026-08-20)
Feb. 15, 2018	ATRA	F	3,604	$47.05	$169,568	183,520 Direct	-1.93%	Disposed	-99.2% (price as of 2026-08-20)
Feb. 15, 2018	ATRA	M	7,211	—	—	187,124 Direct	+4.01%	Acquired	(price as of 2026-08-20)
Feb. 9, 2018	ATRA	F	3,704	$41.70	$154,457	179,913 Direct	-2.02%	Disposed	-99.1% (price as of 2026-08-20)
Feb. 6, 2018	ATRA	A	50,000	—	—	50,000 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 6, 2018	ATRA	F	4,437	$35.80	$158,845	183,617 Direct	-2.36%	Disposed	-98.9% (price as of 2026-08-20)
Feb. 6, 2018	ATRA	A	25,000	—	—	188,054 Direct	+15.33%	Acquired	(price as of 2026-08-20)
Nov. 16, 2017	ATRA	S	3,290	$14.20	$46,718	163,052 Direct	-1.98%	Disposed	-97.3% (price as of 2026-08-20)
Nov. 15, 2017	ATRA	M	7,212	—	—	12,019 Direct	-37.50%	Disposed	(price as of 2026-08-20)
Nov. 15, 2017	ATRA	M	7,212	—	—	166,342 Direct	+4.53%	Acquired	(price as of 2026-08-20)
Aug. 16, 2017	ATRA	S	3,021	$14.33	$43,291	159,130 Direct	-1.86%	Disposed	-97.3% (price as of 2026-08-20)
Aug. 15, 2017	ATRA	M	7,211	—	—	19,231 Direct	-27.27%	Disposed	(price as of 2026-08-20)
Aug. 15, 2017	ATRA	M	7,211	—	—	162,151 Direct	+4.65%	Acquired	(price as of 2026-08-20)
May 16, 2017	ATRA	S	3,873	$15.25	$59,063	153,000 Direct	-2.47%	Disposed	-97.5% (price as of 2026-08-20)
May 15, 2017	ATRA	M	7,212	—	—	26,442 Direct	-21.43%	Disposed	(price as of 2026-08-20)
May 15, 2017	ATRA	M	7,212	—	—	156,873 Direct	+4.82%	Acquired	(price as of 2026-08-20)
Feb. 16, 2017	ATRA	S	3,059	$15.96	$48,822	149,661 Direct	-2.00%	Disposed	-97.6% (price as of 2026-08-20)
Feb. 15, 2017	ATRA	M	7,211	—	—	33,654 Direct	-17.65%	Disposed	(price as of 2026-08-20)
Feb. 15, 2017	ATRA	M	7,211	—	—	152,720 Direct	+4.96%	Acquired	(price as of 2026-08-20)
Feb. 6, 2017	ATRA	A	49,500	—	—	144,687 Direct	+52.00%	Acquired	(price as of 2026-08-20)
Nov. 16, 2016	ATRA	S	2,995	$19.53	$58,492	95,187 Direct	-3.05%	Disposed	-98.0% (price as of 2026-08-20)
Nov. 15, 2016	ATRA	M	7,212	—	—	40,865 Direct	-15.00%	Disposed	(price as of 2026-08-20)
Nov. 15, 2016	ATRA	M	7,212	—	—	98,182 Direct	+7.93%	Acquired	(price as of 2026-08-20)
Aug. 15, 2016	ATRA	M	7,211	—	—	48,077 Direct	-13.04%	Disposed	(price as of 2026-08-20)
Aug. 15, 2016	ATRA	M	7,211	—	—	90,970 Direct	+8.61%	Acquired	(price as of 2026-08-20)
May 16, 2016	ATRA	M	7,212	—	—	55,288 Direct	-11.54%	Disposed	(price as of 2026-08-20)
May 16, 2016	ATRA	S 10b5-1	4,153	$15.15	$62,918	83,759 Direct	-4.72%	Disposed	-97.5% (price as of 2026-08-20)
May 16, 2016	ATRA	M	7,212	—	—	87,912 Direct	+8.94%	Acquired	(price as of 2026-08-20)
Feb. 16, 2016	ATRA	M	7,211	—	—	62,500 Direct	-10.34%	Disposed	(price as of 2026-08-20)
Feb. 16, 2016	ATRA	S 10b5-1	4,153	$15.35	$63,749	80,700 Direct	-4.89%	Disposed	-97.5% (price as of 2026-08-20)
Feb. 16, 2016	ATRA	M	7,211	—	—	84,853 Direct	+9.29%	Acquired	(price as of 2026-08-20)
Feb. 9, 2016	ATRA	A	42,857	—	—	77,642 Direct	+123.21%	Acquired	(price as of 2026-08-20)
Dec. 17, 2015	ATRA	A	65,000	—	—	65,000 Direct	—	Acquired	(price as of 2026-08-20)
Nov. 16, 2015	ATRA	M	4,808	—	—	69,711 Direct	-6.45%	Disposed	(price as of 2026-08-20)
Nov. 16, 2015	ATRA	S 10b5-1	4,153	$31.67	$131,526	34,785 Direct	-10.67%	Disposed	-98.8% (price as of 2026-08-20)
Nov. 16, 2015	ATRA	M	4,808	—	—	38,938 Direct	+14.09%	Acquired	(price as of 2026-08-20)
Aug. 17, 2015	ATRA	M	9,615	—	—	74,519 Direct	-11.43%	Disposed	(price as of 2026-08-20)
Aug. 17, 2015	ATRA	M 10b5-1	1,291	—	—	40,042 Direct	-3.12%	Disposed	(price as of 2026-08-20)
Aug. 17, 2015	ATRA	M 10b5-1	469	—	—	14,531 Direct	-3.13%	Disposed	(price as of 2026-08-20)
Aug. 17, 2015	ATRA	S 10b5-1	7,829	$46.19	$361,622	34,130 Direct	-18.66%	Disposed	-99.2% (price as of 2026-08-20)
Aug. 17, 2015	ATRA	M 10b5-1	469	$11.00	$5,159	41,959 Direct	+1.13%	Acquired	-96.5% (price as of 2026-08-20)
Aug. 17, 2015	ATRA	M 10b5-1	1,291	$25.15	$32,469	41,490 Direct	+3.21%	Acquired	-98.5% (price as of 2026-08-20)
Aug. 17, 2015	ATRA	M	9,615	—	—	40,199 Direct	+31.44%	Acquired	(price as of 2026-08-20)
May 15, 2015	ATRA	M	31,250	—	—	84,134 Direct	+59.09%	Acquired	(price as of 2026-08-20)
May 15, 2015	ATRA	F	13,066	$37.30	$487,362	30,584 Direct	-29.93%	Disposed	-99.0% (price as of 2026-08-20)
May 15, 2015	ATRA	M	31,250	—	—	43,650 Direct	+252.02%	Acquired	(price as of 2026-08-20)
Jan. 16, 2015	ATRA	M	41,333	—	—	41,333 Direct	—	Acquired	(price as of 2026-08-20)
Jan. 16, 2015	ATRA	A	12,400	—	—	12,400 Direct	—	Acquired	(price as of 2026-08-20)
Oct. 21, 2014	ATRA	A	115,384	—	—	115,384 Direct	—	Acquired	(price as of 2026-08-20)
Oct. 15, 2014	ATRA	M	15,000	—	—	15,000 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.

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 15, 2018	ATRA	Restricted Stock Units	Common Stock (4,808)	—	—	4,808	Disposed
March 27, 2018	ATRA	Employee Stock Option (Right to Buy)	Common Stock (11,406)	$11.00	Oct. 14, 2021	11,406	Disposed
March 27, 2018	ATRA	Employee Stock Option (Right to Buy)	Common Stock (32,500)	$22.72	Dec. 17, 2022	32,500	Disposed
March 27, 2018	ATRA	Employee Stock Option (Right to Buy)	Common Stock (28,848)	$25.15	Jan. 16, 2022	28,848	Disposed
Feb. 15, 2018	ATRA	Restricted Stock Units	Common Stock (7,211)	—	—	7,211	Disposed
Feb. 6, 2018	ATRA	Employee Stock Option (Right to Buy)	Common Stock (50,000)	$35.80	Feb. 6, 2025	50,000	Acquired
Nov. 15, 2017	ATRA	Restricted Stock Unites	Common Stock (7,212)	—	—	7,212	Disposed
Aug. 15, 2017	ATRA	Restricted Stock Unites	Common Stock (7,211)	—	—	7,211	Disposed
May 15, 2017	ATRA	Restricted Stock Unites	Common Stock (7,212)	—	—	7,212	Disposed
Feb. 15, 2017	ATRA	Restricted Stock Unites	Common Stock (7,211)	—	—	7,211	Disposed
Nov. 15, 2016	ATRA	Restricted Stock Unites	Common Stock (7,212)	—	—	7,212	Disposed
Aug. 15, 2016	ATRA	Restricted Stock Unites	Common Stock (7,211)	—	—	7,211	Disposed
May 16, 2016	ATRA	Restricted Stock Unites	Common Stock (7,212)	—	—	7,212	Disposed
Feb. 16, 2016	ATRA	Restricted Stock Unites	Common Stock (7,211)	—	—	7,211	Disposed
Dec. 17, 2015	ATRA	Employee Stock Option (Right to Buy)	Common Stock (65,000)	$22.72	Dec. 17, 2022	65,000	Acquired
Nov. 16, 2015	ATRA	Restricted Stock Units	Common Stock (4,808)	—	—	4,808	Disposed
Aug. 17, 2015	ATRA	Restricted Stock Units	Common Stock (9,615)	—	—	9,615	Disposed
Aug. 17, 2015	ATRA	Employee Stock Option (Right to Buy)	Common Stock (1,291)	$25.15	Jan. 16, 2022	1,291	Disposed
Aug. 17, 2015	ATRA	Employee Stock Option (Right to Buy)	Common Stock (469)	$11.00	Oct. 14, 2021	469	Disposed
May 15, 2015	ATRA	Restricted Stock Units	Common Stock (31,250)	—	—	31,250	Acquired
Jan. 16, 2015	ATRA	Employee Stock Option (Right to Buy)	Common Stock (41,333)	$25.15	Jan. 16, 2022	41,333	Acquired
Oct. 21, 2014	ATRA	Restricted Stock Unit	Common Stock (115,384)	—	—	115,384	Acquired
Oct. 15, 2014	ATRA	Employee Stock Option (Right to Buy)	Common Stock (15,000)	$11.00	Oct. 14, 2021	15,000	Acquired

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

Compensation (DEF 14A)

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

ATRA

Fiscal year	Salary	Bonus	Stock awards	Option awards	Non-equity incentive	Pension change	Other	Total
2014	$231,806	$90,620	$991,495	$87,750	—	—	$1,240	$1,402,911

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