Karl S. Dahlquist

CIK 1861996 · View on SEC EDGAR ↗

Insider

First SEC filing: May 24, 2021 · Latest: May 24, 2021

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

ATRC selling March 18, 2024

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
June 30, 2026	ATRC	A	636	$23.78	$15,124	96,689 Direct	+0.66%	Acquired	98.9% (price as of 2026-08-21)
June 30, 2025	ATRC	A	822	$25.84	$21,240	68,551 Direct	+1.21%	Acquired	83.0% (price as of 2026-08-21)
March 1, 2025	ATRC	A	19,359	—	—	71,020 Direct	+37.47%	Acquired	(price as of 2026-08-21)
March 1, 2025	ATRC	A	6,579	—	—	77,599 Direct	+9.26%	Acquired	(price as of 2026-08-21)
March 1, 2025	ATRC	F	9,870	$38.74	$382,364	67,729 Direct	-12.72%	Disposed	22.1% (price as of 2026-08-21)
June 28, 2024	ATRC	A	707	$19.35	$13,680	51,661 Direct	+1.39%	Acquired	144.4% (price as of 2026-08-21)
March 18, 2024	ATRC	S 10b5-1	1,885	$32.16	$60,622	50,954 Direct	-3.57%	Disposed	47.1% (price as of 2026-08-21)
March 5, 2024	ATRC	S 10b5-1	8,231	$37.36	$307,510	52,839 Direct	-13.48%	Disposed	26.6% (price as of 2026-08-21)
March 1, 2024	ATRC	A	22,050	—	—	52,839 Direct	+71.62%	Acquired	(price as of 2026-08-21)
March 1, 2024	ATRC	A	8,231	—	—	61,070 Direct	+15.58%	Acquired	(price as of 2026-08-21)
Nov. 1, 2023	ATRC	S 10b5-1	1,248	$34.43	$42,969	30,789 Direct	-3.90%	Disposed	37.4% (price as of 2026-08-21)
July 26, 2023	ATRC	S 10b5-1	3,417	$57.09	$195,077	32,037 Direct	-9.64%	Disposed	-17.2% (price as of 2026-08-21)
June 30, 2023	ATRC	A	557	$38.11	$21,227	35,454 Direct	+1.60%	Acquired	24.1% (price as of 2026-08-21)
June 6, 2023	ATRC	S 10b5-1	1,422	$47.03	$66,877	34,897 Direct	-3.92%	Disposed	0.6% (price as of 2026-08-21)
May 1, 2023	ATRC	S 10b5-1	4,417	$44.83	$198,014	36,319 Direct	-10.84%	Disposed	5.5% (price as of 2026-08-21)
March 1, 2023	ATRC	A	8,036	—	—	31,526 Direct	+34.21%	Acquired	(price as of 2026-08-21)
March 1, 2023	ATRC	A	16,104	—	—	47,630 Direct	+51.08%	Acquired	(price as of 2026-08-21)
March 1, 2023	ATRC	F	6,894	$38.81	$267,556	40,736 Direct	-14.47%	Disposed	21.9% (price as of 2026-08-21)
June 30, 2022	ATRC	A	350	$34.73	$12,156	23,490 Direct	+1.51%	Acquired	36.2% (price as of 2026-08-21)
March 1, 2022	ATRC	A	7,789	—	—	23,614 Direct	+49.22%	Acquired	(price as of 2026-08-21)
March 1, 2022	ATRC	A	6,825	—	—	30,439 Direct	+28.90%	Acquired	(price as of 2026-08-21)
March 1, 2022	ATRC	F	7,299	$69.59	$507,937	23,140 Direct	-23.98%	Disposed	-32.0% (price as of 2026-08-21)
Dec. 31, 2021	ATRC	A	24	$59.10	$1,418	15,825 Direct	+0.15%	Acquired	-20.0% (price as of 2026-08-21)
July 1, 2021	ATRC	S 10b5-1	336	$79.53	$26,722	15,801 Direct	-2.08%	Disposed	-40.5% (price as of 2026-08-21)
June 30, 2021	ATRC	A	428	$45.72	$19,568	16,137 Direct	+2.72%	Acquired	3.4% (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.

Initial ownership (Form 3) 1 holding

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

Date	Ticker	Security	Shares	Ownership
May 24, 2021	ATRC	Common Stock	—	Direct