John W Kosiba JR

Insider

First SEC filing: April 11, 2017 · Latest: June 11, 2026

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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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

AMSC selling June 11, 2026

Insider transactions

0 buys (P) 11 sells (S) Net: $-2,317,654 + 33 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

33 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
June 11, 2026	AMSC	S 10b5-1	1,743	$37.85	$65,973	334,377 Direct	-0.52%	Disposed	-20.0% (price as of 2026-08-21)
June 11, 2026	AMSC	S 10b5-1	5,026	$37.33	$187,621	336,120 Direct	-1.47%	Disposed	-18.9% (price as of 2026-08-21)
June 8, 2026	AMSC	S 10b5-1	1,549	$42.35	$65,600	341,146 Direct	-0.45%	Disposed	-28.5% (price as of 2026-08-21)
June 8, 2026	AMSC	S 10b5-1	3,286	$41.50	$136,369	342,695 Direct	-0.95%	Disposed	-27.0% (price as of 2026-08-21)
June 3, 2026	AMSC	S 10b5-1	609	$50.83	$30,955	345,981 Direct	-0.18%	Disposed	-40.4% (price as of 2026-08-21)
June 3, 2026	AMSC	S 10b5-1	2,638	$49.28	$130,001	346,590 Direct	-0.76%	Disposed	-38.5% (price as of 2026-08-21)
June 3, 2026	AMSC	S 10b5-1	3,200	$48.31	$154,592	349,228 Direct	-0.91%	Disposed	-37.3% (price as of 2026-08-21)
June 2, 2026	AMSC	S 10b5-1	600	$52.19	$31,314	352,428 Direct	-0.17%	Disposed	-42.0% (price as of 2026-08-21)
June 2, 2026	AMSC	S 10b5-1	12,036	$51.47	$619,493	353,028 Direct	-3.30%	Disposed	-41.2% (price as of 2026-08-21)
June 2, 2026	AMSC	S 10b5-1	12,122	$50.62	$613,616	365,064 Direct	-3.21%	Disposed	-40.2% (price as of 2026-08-21)
June 2, 2026	AMSC	S 10b5-1	5,704	$49.46	$282,120	377,186 Direct	-1.49%	Disposed	-38.8% (price as of 2026-08-21)
June 1, 2026	AMSC	A	30,000	—	—	382,890 Direct	+8.50%	Acquired	(price as of 2026-08-21)
Aug. 4, 2025	AMSC	S	9,843	$55.26	$543,924	0 Indirect	-100.00%	Disposed	-45.2% (price as of 2026-08-21)
Aug. 4, 2025	AMSC	S	15,740	$55.13	$867,746	352,890 Direct	-4.27%	Disposed	-45.1% (price as of 2026-08-21)
Aug. 4, 2025	AMSC	S	34,260	$54.34	$1,861,688	368,630 Direct	-8.50%	Disposed	-44.3% (price as of 2026-08-21)
June 11, 2025	AMSC	S	300	$29.08	$8,724	402,890 Direct	-0.07%	Disposed	4.2% (price as of 2026-08-21)
June 11, 2025	AMSC	S	6,342	$28.55	$181,064	403,190 Direct	-1.55%	Disposed	6.1% (price as of 2026-08-21)
June 6, 2025	AMSC	S	4,744	$31.83	$151,002	409,532 Direct	-1.15%	Disposed	-4.8% (price as of 2026-08-21)
May 27, 2025	AMSC	S 10b5-1	39,903	$26.61	$1,061,819	414,276 Direct	-8.79%	Disposed	13.8% (price as of 2026-08-21)
May 27, 2025	AMSC	S 10b5-1	10,097	$25.55	$257,978	454,179 Direct	-2.17%	Disposed	18.6% (price as of 2026-08-21)
May 20, 2025	AMSC	S	11,860	$24.50	$290,570	464,276 Direct	-2.49%	Disposed	23.6% (price as of 2026-08-21)
May 15, 2025	AMSC	A	120,000	—	—	476,136 Direct	+33.69%	Acquired	(price as of 2026-08-21)
Nov. 4, 2024	AMSC	S	50,000	$28.28	$1,414,000	356,136 Direct	-12.31%	Disposed	7.1% (price as of 2026-08-21)
Sept. 26, 2024	AMSC	A	90,000	—	—	406,136 Direct	+28.47%	Acquired	(price as of 2026-08-21)
June 11, 2024	AMSC	S 10b5-1	32,000	$21.68	$693,760	316,136 Direct	-9.19%	Disposed	39.7% (price as of 2026-08-21)
May 21, 2024	AMSC	S 10b5-1	2,170	$15.30	$33,201	348,136 Direct	-0.62%	Disposed	98.0% (price as of 2026-08-21)
May 21, 2024	AMSC	S 10b5-1	26,830	$14.78	$396,547	350,306 Direct	-7.11%	Disposed	104.9% (price as of 2026-08-21)
June 22, 2023	AMSC	S 10b5-1	29,878	$5.95	$177,774	377,136 Direct	-7.34%	Disposed	409.1% (price as of 2026-08-21)
June 21, 2023	AMSC	S 10b5-1	50,132	$6.15	$308,312	407,014 Direct	-10.97%	Disposed	392.5% (price as of 2026-08-21)
June 15, 2023	AMSC	D	1,613	—	—	457,146 Direct	-0.35%	Disposed	(price as of 2026-08-21)
June 15, 2023	AMSC	A	105,000	—	—	458,759 Direct	+29.68%	Acquired	(price as of 2026-08-21)
Dec. 16, 2022	AMSC	P	15,000	$3.50	$52,500	353,759 Direct	+4.43%	Acquired	765.4% (price as of 2026-08-21)
Dec. 12, 2022	AMSC	P	25,000	$3.34	$83,500	338,759 Direct	+7.97%	Acquired	806.9% (price as of 2026-08-21)
Oct. 19, 2022	AMSC	A	125,000	—	—	313,759 Direct	+66.22%	Acquired	(price as of 2026-08-21)
June 10, 2022	AMSC	S 10b5-1	8,473	$5.97	$50,584	188,759 Direct	-4.30%	Disposed	407.4% (price as of 2026-08-21)
May 31, 2022	AMSC	S 10b5-1	13,325	$5.45	$72,621	197,232 Direct	-6.33%	Disposed	455.8% (price as of 2026-08-21)
Dec. 10, 2021	AMSC	S 10b5-1	22,754	$11.31	$257,348	210,557 Direct	-9.75%	Disposed	167.8% (price as of 2026-08-21)
Nov. 2, 2021	AMSC	S 10b5-1	259	$19.31	$5,001	233,311 Direct	-0.11%	Disposed	56.9% (price as of 2026-08-21)
Nov. 2, 2021	AMSC	S 10b5-1	6,983	$18.77	$131,071	233,570 Direct	-2.90%	Disposed	61.4% (price as of 2026-08-21)
Nov. 1, 2021	AMSC	S 10b5-1	3,766	$18.95	$71,366	240,553 Direct	-1.54%	Disposed	59.8% (price as of 2026-08-21)
Aug. 5, 2021	AMSC	A	11,943	$12.54	$149,765	244,319 Direct	+5.14%	Acquired	141.5% (price as of 2026-08-21)
July 1, 2021	AMSC	S 10b5-1	6,409	$17.66	$113,183	232,376 Direct	-2.68%	Disposed	71.5% (price as of 2026-08-21)
May 24, 2021	AMSC	S 10b5-1	5,794	$14.18	$82,159	238,785 Direct	-2.37%	Disposed	113.6% (price as of 2026-08-21)
May 20, 2021	AMSC	A	30,000	—	—	244,579 Direct	+13.98%	Acquired	(price as of 2026-08-21)
Jan. 21, 2021	AMSC	S 10b5-1	10,661	$28.03	$298,828	214,579 Direct	-4.73%	Disposed	8.1% (price as of 2026-08-21)
Jan. 21, 2021	AMSC	S 10b5-1	8,333	$27.66	$230,491	225,240 Direct	-3.57%	Disposed	9.5% (price as of 2026-08-21)
Jan. 21, 2021	AMSC	S 10b5-1	6,100	$26.56	$162,016	233,573 Direct	-2.55%	Disposed	14.0% (price as of 2026-08-21)
Nov. 25, 2020	AMSC	S	25,000	$19.28	$482,000	239,673 Direct	-9.45%	Disposed	57.1% (price as of 2026-08-21)
Nov. 1, 2020	AMSC	F	7,321	$13.91	$101,835	264,673 Direct	-2.69%	Disposed	117.8% (price as of 2026-08-21)
Oct. 31, 2020	AMSC	F	3,774	$13.91	$52,496	271,994 Direct	-1.37%	Disposed	117.8% (price as of 2026-08-21)
July 27, 2020	AMSC	F	5,228	$9.74	$50,921	275,768 Direct	-1.86%	Disposed	211.0% (price as of 2026-08-21)
June 28, 2020	AMSC	F	6,518	$7.28	$47,451	280,996 Direct	-2.27%	Disposed	316.1% (price as of 2026-08-21)
June 2, 2020	AMSC	F	5,324	$7.91	$42,113	287,514 Direct	-1.82%	Disposed	282.9% (price as of 2026-08-21)
June 2, 2020	AMSC	D	24,000	—	—	292,838 Direct	-7.57%	Disposed	(price as of 2026-08-21)
May 21, 2020	AMSC	A	116,667	—	—	316,838 Direct	+58.28%	Acquired	(price as of 2026-08-21)
Dec. 19, 2019	AMSC	S 10b5-1	10,287	$7.63	$78,490	200,171 Direct	-4.89%	Disposed	297.0% (price as of 2026-08-21)
Nov. 5, 2019	AMSC	D	7,375	—	—	210,508 Direct	-3.38%	Disposed	(price as of 2026-08-21)
Nov. 1, 2019	AMSC	F	7,378	$8.08	$59,614	217,883 Direct	-3.28%	Disposed	274.9% (price as of 2026-08-21)
Oct. 31, 2019	AMSC	A	45,500	—	—	225,211 Direct	+25.32%	Acquired	(price as of 2026-08-21)
July 27, 2019	AMSC	F	5,307	$8.81	$46,755	179,711 Direct	-2.87%	Disposed	243.8% (price as of 2026-08-21)
June 28, 2019	AMSC	F	6,529	$9.28	$60,589	185,018 Direct	-3.41%	Disposed	226.4% (price as of 2026-08-21)
May 12, 2019	AMSC	F	2,365	$11.09	$26,228	191,547 Direct	-1.22%	Disposed	173.1% (price as of 2026-08-21)
Dec. 28, 2018	AMSC	S 10b5-1	12,374	$10.31	$127,576	193,912 Direct	-6.00%	Disposed	193.8% (price as of 2026-08-21)
Dec. 7, 2018	AMSC	S	6,250	$10.58	$66,125	206,286 Direct	-2.94%	Disposed	186.3% (price as of 2026-08-21)
Nov. 8, 2018	AMSC	F	1,617	$9.48	$15,329	212,536 Direct	-0.76%	Disposed	219.5% (price as of 2026-08-21)
Nov. 1, 2018	AMSC	A	50,000	—	—	214,153 Direct	+30.46%	Acquired	(price as of 2026-08-21)
Aug. 2, 2018	AMSC	F	1,602	$5.74	$9,195	164,153 Direct	-0.97%	Disposed	427.7% (price as of 2026-08-21)
June 28, 2018	AMSC	A	59,000	—	—	165,755 Direct	+55.27%	Acquired	(price as of 2026-08-21)
May 14, 2018	AMSC	F	2,178	$6.88	$14,985	106,755 Direct	-2.00%	Disposed	340.3% (price as of 2026-08-21)
May 14, 2018	AMSC	F	2,177	$6.88	$14,978	108,933 Direct	-1.96%	Disposed	340.3% (price as of 2026-08-21)
May 12, 2018	AMSC	F	2,443	$6.89	$16,832	111,110 Direct	-2.15%	Disposed	339.6% (price as of 2026-08-21)
May 8, 2018	AMSC	F	2,617	$4.06	$10,625	37,383 Direct	-6.54%	Disposed	646.1% (price as of 2026-08-21)
Feb. 9, 2018	AMSC	P	5,000	—	—	113,553 Direct	+4.61%	Acquired	(price as of 2026-08-21)
Feb. 8, 2018	AMSC	P	5,000	$4.62	$23,100	113,553 Direct	+4.61%	Acquired	555.6% (price as of 2026-08-21)
July 28, 2017	AMSC	A	72,000	—	—	108,553 Direct	+196.97%	Acquired	(price as of 2026-08-21)
May 14, 2017	AMSC	F	2,307	$4.06	$9,366	36,553 Direct	-5.94%	Disposed	646.1% (price as of 2026-08-21)
May 14, 2017	AMSC	F	2,307	$4.06	$9,366	38,860 Direct	-5.60%	Disposed	646.1% (price as of 2026-08-21)
May 12, 2017	AMSC	F	2,466	$4.06	$10,012	41,167 Direct	-5.65%	Disposed	646.1% (price as of 2026-08-21)
May 10, 2017	AMSC	P	6,250	$4.00	$25,000	43,633 Direct	+16.72%	Acquired	657.3% (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) 7 holdings

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

Date	Ticker	Security	Shares	Ownership
April 11, 2017	AMSC	Common Stock	40,000	Direct
April 11, 2017	AMSC	Common Stock	—	Indirect
April 11, 2017	AMSC	Stock Option (Right to buy)→ Common Stock (999)	999	Direct
April 11, 2017	AMSC	Stock Option (Right to buy)→ Common Stock (449)	449	Direct
April 11, 2017	AMSC	Stock Option (Right to buy)→ Common Stock (1,500)	1,500	Direct
April 11, 2017	AMSC	Stock Option (Right to buy)→ Common Stock (1,999)	1,999	Direct
April 11, 2017	AMSC	Stock Option (Right to buy)→ Common Stock (3,200)	3,200	Direct