ATRO US Equity

ASTRONICS CORP

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Industrials · Aircraft Parts & Auxiliary Equipment, NEC · CIK 8063 · FYE 1231

$65.14

-3.19 (-4.67%)

USD · as of 2026-07-29 · marketstack

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Institutional ownership· 13F filers holding ATRO · 2026-Q1 methodology → sources →

290 holders

% of shares outstanding held

96.4%

Shares held (13F)

31,119,400

Reporting holders

290

Top holders

largest 100 of 290 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	2,825,4102.8M	$189M	8.75%	—
2	STATE STREET CORP	2,349,8152.3M	$157M	7.28%	ADD 28%
3	AMERICAN CENTURY COMPANIES INC	1,737,5731.7M	$116M	5.38%	—
4	VANGUARD CAPITAL MANAGEMENT LLC	1,388,8991.4M	$93M	4.30%	NEW†
5	Capital International Investors	1,288,9471.3M	$86M	3.99%	TRIM -30%
6	GEODE CAPITAL MANAGEMENT, LLC	887,033887,033	$59M	2.75%	ADD 17%
7	Pertento Partners LLP	815,333815,333	$54M	2.53%	NEW†
8	NEXT CENTURY GROWTH INVESTORS LLC	786,317786,317	$52M	2.44%	TRIM -26%
9	DIMENSIONAL FUND ADVISORS LP	673,760673,760	$45M	2.09%	ADD 5%
10	D. E. Shaw & Co., Inc.	608,449608,449	$41M	1.88%	ADD 23%
11	Point72 Asset Management, L.P.	567,240567,240	$38M	1.76%	ADD 14%
12	Capital World Investors	560,939560,939	$37M	1.74%	NEW
13	RAYMOND JAMES FINANCIAL INC	492,812492,812	$31M	1.53%	ADD 13%
14	GOLDMAN SACHS GROUP INC	455,054455,054	$30M	1.41%	ADD 45%
15	AMERIPRISE FINANCIAL INC	450,667450,667	$30M	1.40%	ADD 76%
16	EMERALD ADVISERS, LLC	449,126449,126	$30M	1.39%	ADD 85%
17	MORGAN STANLEY	447,541447,541	$30M	1.39%	TRIM -19%
18	Nuveen, LLC	401,264401,264	$27M	1.24%	—
19	HENNESSY ADVISORS INC	377,800377,800	$25M	1.17%	TRIM -3%
20	BNP PARIBAS FINANCIAL MARKETS	371,030371,030	$25M	1.15%	TRIM -17%
21	VANGUARD PORTFOLIO MANAGEMENT LLC	366,014366,014	$24M	1.13%	NEW
22	ROYCE & ASSOCIATES LP	363,383363,383	$24M	1.13%	TRIM -30%
23	Fisher Asset Management, LLC	348,842348,842	$23M	1.08%	ADD 475%
24	Driehaus Capital Management LLC	326,471326,471	$22M	1.01%	TRIM -51%
25	FRED ALGER MANAGEMENT, LLC	324,954324,954	$22M	1.01%	ADD 121%
26	Private Capital Management, LLC	322,543322,543	$22M	1.00%	TRIM -42%
27	UBS Group AG	291,144291,144	$19M	0.90%	ADD 3%
28	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	288,762288,762	$19M	0.89%	—
29	JUPITER ASSET MANAGEMENT LTD	280,976280,976	$19M	0.87%	NEW
30	EMERALD MUTUAL FUND ADVISERS TRUST	279,159279,159	$19M	0.86%	ADD 78%
31	NEEDHAM INVESTMENT MANAGEMENT LLC	272,500272,500	$18M	0.84%	—
32	NORTHERN TRUST CORP	268,910268,910	$18M	0.83%	ADD 3%
33	CASPIAN CAPITAL LP	267,724267,724	$18M	0.83%	ADD 18%
34	DEUTSCHE BANK AG\	261,555261,555	$17M	0.81%	TRIM -37%
35	FIRST TRUST ADVISORS LP	253,492253,492	$17M	0.79%	ADD 4%
36	MARSHALL WACE, LLP	251,213251,213	$17M	0.78%	TRIM -35%
37	AQR CAPITAL MANAGEMENT LLC	247,301247,301	$17M	0.77%	TRIM -4%
38	ACADIAN ASSET MANAGEMENT LLC	229,285229,285	$15M	0.71%	ADD 48%
39	RENAISSANCE TECHNOLOGIES LLC	222,920222,920	$15M	0.69%	ADD 320%
40	MILLENNIUM MANAGEMENT LLC	220,023220,023	$15M	0.68%	TRIM -39%
41	VANGUARD FIDUCIARY TRUST CO	217,931217,931	$15M	0.68%	NEW
42	TWO SIGMA INVESTMENTS, LP	216,727216,727	$14M	0.67%	ADD 551%
43	CANADA PENSION PLAN INVESTMENT BOARD	212,800212,800	$14M	0.66%	TRIM -26%
44	JANE STREET GROUP, LLC	201,091201,091	$13M	0.62%	ADD 1811%
45	BANK OF AMERICA CORP /DE/	199,722199,722	$13M	0.62%	ADD 82%
46	M&G PLC	198,707198,707	$13M	0.62%	NEW
47	First Eagle Investment Management, LLC	192,326192,326	$13M	0.60%	TRIM -16%
48	ROYAL BANK OF CANADA	183,464183,464	$12M	0.57%	TRIM -3%
49	Invesco Ltd.	179,027179,027	$12M	0.55%	TRIM -13%
50	Congruence Capital, LLC	175,366175,366	$12M	0.54%	TRIM -52%
51	Qube Research & Technologies Ltd	166,759166,759	$11M	0.52%	ADD 286%
52	KENNEDY CAPITAL MANAGEMENT LLC	143,717143,717	$10M	0.45%	ADD 32%
53	Connor, Clark & Lunn Investment Management Ltd.	142,499142,499	$10M	0.44%	TRIM -10%
54	HSBC HOLDINGS PLC	144,233144,233	$9M	0.45%	TRIM -51%
55	Trexquant Investment LP	138,037138,037	$9M	0.43%	ADD 51%
56	Advisors Asset Management, Inc.	135,131135,131	$9M	0.42%	TRIM -7%
57	WELLS FARGO & COMPANY/MN	120,649120,649	$8M	0.37%	ADD 148%
58	Bank of New York Mellon Corp	115,298115,298	$8M	0.36%	TRIM -15%
59	PEREGRINE CAPITAL MANAGEMENT LLC	113,520113,520	$8M	0.35%	NEW
60	Walleye Capital LLC	110,412110,412	$7M	0.34%	NEW
61	VOLORIDGE INVESTMENT MANAGEMENT, LLC	102,228102,228	$7M	0.32%	TRIM -52%
62	RBF Capital, LLC	100,372100,372	$7M	0.31%	NEW
63	Hudson Bay Capital Management LP	100,000100,000	$7M	0.31%	—
64	Informed Momentum Co LLC	99,45399,453	$7M	0.31%	TRIM -21%
65	CITADEL ADVISORS LLC	96,42496,424	$6M	0.30%	TRIM -69%
66	TORONTO DOMINION BANK	94,37594,375	$6M	0.29%	TRIM -27%
67	FRANKLIN RESOURCES INC	89,01089,010	$6M	0.28%	ADD 19%
68	ALGERT GLOBAL LLC	86,96886,968	$6M	0.27%	ADD 949%
69	HRT FINANCIAL LP	78,37678,376	$5M	0.24%	ADD 97%
70	PRINCIPAL FINANCIAL GROUP INC	76,47576,475	$5M	0.24%	ADD 3%
71	PRUDENTIAL FINANCIAL INC	75,44575,445	$5M	0.23%	TRIM -9%
72	NORDEA INVESTMENT MANAGEMENT AB	75,23075,230	$5M	0.23%	TRIM -4%
73	LPL Financial LLC	72,91472,914	$5M	0.23%	ADD 325%
74	NEW YORK STATE COMMON RETIREMENT FUND	72,18972,189	$5M	0.22%	TRIM -21%
75	SEI INVESTMENTS CO	71,03971,039	$5M	0.22%	ADD 153%
76	Minerva Advisors LLC	70,34070,340	$5M	0.22%	TRIM -31%
77	Hennion & Walsh Asset Management, Inc.	66,07666,076	$4M	0.20%	ADD 30%
78	Legal & General Group Plc	63,34363,343	$4M	0.20%	TRIM -7%
79	Russell Investments Group, Ltd.	60,45560,455	$4M	0.19%	ADD 40%
80	TUDOR INVESTMENT CORP ET AL	58,96658,966	$4M	0.18%	TRIM -39%
81	SUSQUEHANNA INTERNATIONAL GROUP, LLP	57,89857,898	$4M	0.18%	ADD 39%
82	BARCLAYS PLC	57,52157,521	$4M	0.18%	ADD 11%
83	Teton Advisors, LLC	57,00057,000	$4M	0.18%	TRIM -26%
84	JPMORGAN CHASE & CO	60,91760,917	$4M	0.19%	ADD 3%
85	RHUMBLINE ADVISERS	55,39555,395	$4M	0.17%	—
86	CAXTON ASSOCIATES LLP	55,33455,334	$4M	0.17%	ADD 3%
87	Swiss National Bank	52,10052,100	$3M	0.16%	—
88	STATE OF WISCONSIN INVESTMENT BOARD	51,60851,608	$3M	0.16%	TRIM -10%
89	PDT Partners, LLC	49,20849,208	$3M	0.15%	TRIM -41%
90	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	48,94448,944	$3M	0.15%	—
91	WHITE PINE CAPITAL LLC	45,53945,539	$3M	0.14%	TRIM -36%
92	VICTORY CAPITAL MANAGEMENT INC	44,66944,669	$3M	0.14%	TRIM -25%
93	FEDERATED HERMES, INC.	42,94742,947	$3M	0.13%	ADD 5%
94	POLEN CAPITAL MANAGEMENT LLCtracked	42,41042,410	$3M	0.13%	TRIM -21%
95	BNP PARIBAS ASSET MANAGEMENT Holding S.A.	40,96140,961	$3M	0.13%	ADD 10794%
96	Lisanti Capital Growth, LLC	40,82040,820	$3M	0.13%	ADD 123%
97	ZACKS INVESTMENT MANAGEMENT	39,07639,076	$3M	0.12%	ADD 18%
98	Universal- Beteiligungs- und Servicegesellschaft mbH	38,99338,993	$3M	0.12%	NEW
99	GABELLI FUNDS LLC	36,98036,980	$2M	0.11%	ADD 9%
100	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	36,97236,972	$2M	0.11%	NEW

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

BlackRock, Inc.

2.6M

2.5M

2.2M

2.3M

2.8M

$189M

STATE STREET CORP

972K

996K

1.5M

1.8M

2.3M

$157M

AMERICAN CENTURY COMPANIES INC

33K

45K

340K

539K

1.8M

1.7M

$116M

VANGUARD CAPITAL MANAGEMENT LLC

—

1.4M

$93M

Capital International Investors

—

1.4M

1.8M

1.3M

$86M

GEODE CAPITAL MANAGEMENT, LLC

691K

714K

736K

748K

756K

887K

$59M

Pertento Partners LLP

—

815K

$54M

NEXT CENTURY GROWTH INVESTORS LLC

1.5M

1.3M

1.2M

1.1M

786K

$52M

DIMENSIONAL FUND ADVISORS LP

999K

921K

755K

677K

640K

674K

$45M

D. E. Shaw & Co., Inc.

203K

587K

849K

882K

493K

608K

$41M

Point72 Asset Management, L.P.

25K

17K

34K

—

497K

567K

$38M

Capital World Investors

—

561K

$37M

RAYMOND JAMES FINANCIAL INC

—

16K

12K

436K

493K

$31M

GOLDMAN SACHS GROUP INC

176K

222K

151K

210K

315K

455K

$30M

AMERIPRISE FINANCIAL INC

363K

408K

442K

410K

256K

451K

$30M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	290	31,119,400	96.4%	$2.1B
2025-Q4

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Activists & large holders· Schedule 13D/G beneficial owners · ATRO

Activists — 13D, active intent

325 CAPITAL LLC0%EXITEDSCHEDULE 13D/A · Amd 2 · event 2025-10-15SEC →

0 shares · 6 reporting persons

Large holders — 13G, passive (top 5 of 12 by % of class)

Holder

% of class

Type

As of

BlackRock, Inc.

12.6%

QII

2026-06-30

SEC →

STATE STREET CORP

10.4%

QII

2026-06-30

SEC →

DIMENSIONAL FUND ADVISORS LP

7.5%

QII

2026-06-30

SEC →

AMERICAN CENTURY INVESTMENT MANAGEMENT INC

Institutional ownership· 13F filers holding ATRO · 2026-Q1 methodology → sources →

290 holders

% of shares outstanding held

96.4%

Shares held (13F)

31,119,400

Reporting holders

290

Top holders

largest 100 of 290 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	BlackRock, Inc.	2,825,4102.8M	$189M	8.75%	—
2	STATE STREET CORP	2,349,8152.3M	$157M	7.28%	ADD 28%
3	AMERICAN CENTURY COMPANIES INC	1,737,5731.7M	$116M	5.38%	—
4	VANGUARD CAPITAL MANAGEMENT LLC	1,388,8991.4M	$93M	4.30%	NEW†
5	Capital International Investors	1,288,9471.3M	$86M	3.99%	TRIM -30%
6	GEODE CAPITAL MANAGEMENT, LLC	887,033887,033	$59M	2.75%	ADD 17%
7	Pertento Partners LLP	815,333815,333	$54M	2.53%	NEW†
8	NEXT CENTURY GROWTH INVESTORS LLC	786,317786,317	$52M	2.44%	TRIM -26%
9	DIMENSIONAL FUND ADVISORS LP	673,760673,760	$45M	2.09%	ADD 5%
10	D. E. Shaw & Co., Inc.	608,449608,449	$41M	1.88%	ADD 23%
11	Point72 Asset Management, L.P.	567,240567,240	$38M	1.76%	ADD 14%
12	Capital World Investors	560,939560,939	$37M	1.74%	NEW
13	RAYMOND JAMES FINANCIAL INC	492,812492,812	$31M	1.53%	ADD 13%
14	GOLDMAN SACHS GROUP INC	455,054455,054	$30M	1.41%	ADD 45%
15	AMERIPRISE FINANCIAL INC	450,667450,667	$30M	1.40%	ADD 76%
16	EMERALD ADVISERS, LLC	449,126449,126	$30M	1.39%	ADD 85%
17	MORGAN STANLEY	447,541447,541	$30M	1.39%	TRIM -19%
18	Nuveen, LLC	401,264401,264	$27M	1.24%	—
19	HENNESSY ADVISORS INC	377,800377,800	$25M	1.17%	TRIM -3%
20	BNP PARIBAS FINANCIAL MARKETS	371,030371,030	$25M	1.15%	TRIM -17%
21	VANGUARD PORTFOLIO MANAGEMENT LLC	366,014366,014	$24M	1.13%	NEW
22	ROYCE & ASSOCIATES LP	363,383363,383	$24M	1.13%	TRIM -30%
23	Fisher Asset Management, LLC	348,842348,842	$23M	1.08%	ADD 475%
24	Driehaus Capital Management LLC	326,471326,471	$22M	1.01%	TRIM -51%
25	FRED ALGER MANAGEMENT, LLC	324,954324,954	$22M	1.01%	ADD 121%
26	Private Capital Management, LLC	322,543322,543	$22M	1.00%	TRIM -42%
27	UBS Group AG	291,144291,144	$19M	0.90%	ADD 3%
28	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	288,762288,762	$19M	0.89%	—
29	JUPITER ASSET MANAGEMENT LTD	280,976280,976	$19M	0.87%	NEW
30	EMERALD MUTUAL FUND ADVISERS TRUST	279,159279,159	$19M	0.86%	ADD 78%
31	NEEDHAM INVESTMENT MANAGEMENT LLC	272,500272,500	$18M	0.84%	—
32	NORTHERN TRUST CORP	268,910268,910	$18M	0.83%	ADD 3%
33	CASPIAN CAPITAL LP	267,724267,724	$18M	0.83%	ADD 18%
34	DEUTSCHE BANK AG\	261,555261,555	$17M	0.81%	TRIM -37%
35	FIRST TRUST ADVISORS LP	253,492253,492	$17M	0.79%	ADD 4%
36	MARSHALL WACE, LLP	251,213251,213	$17M	0.78%	TRIM -35%
37	AQR CAPITAL MANAGEMENT LLC	247,301247,301	$17M	0.77%	TRIM -4%
38	ACADIAN ASSET MANAGEMENT LLC	229,285229,285	$15M	0.71%	ADD 48%
39	RENAISSANCE TECHNOLOGIES LLC	222,920222,920	$15M	0.69%	ADD 320%
40	MILLENNIUM MANAGEMENT LLC	220,023220,023	$15M	0.68%	TRIM -39%
41	VANGUARD FIDUCIARY TRUST CO	217,931217,931	$15M	0.68%	NEW
42	TWO SIGMA INVESTMENTS, LP	216,727216,727	$14M	0.67%	ADD 551%
43	CANADA PENSION PLAN INVESTMENT BOARD	212,800212,800	$14M	0.66%	TRIM -26%
44	JANE STREET GROUP, LLC	201,091201,091	$13M	0.62%	ADD 1811%
45	BANK OF AMERICA CORP /DE/	199,722199,722	$13M	0.62%	ADD 82%
46	M&G PLC	198,707198,707	$13M	0.62%	NEW
47	First Eagle Investment Management, LLC	192,326192,326	$13M	0.60%	TRIM -16%
48	ROYAL BANK OF CANADA	183,464183,464	$12M	0.57%	TRIM -3%
49	Invesco Ltd.	179,027179,027	$12M	0.55%	TRIM -13%
50	Congruence Capital, LLC	175,366175,366	$12M	0.54%	TRIM -52%
51	Qube Research & Technologies Ltd	166,759166,759	$11M	0.52%	ADD 286%
52	KENNEDY CAPITAL MANAGEMENT LLC	143,717143,717	$10M	0.45%	ADD 32%
53	Connor, Clark & Lunn Investment Management Ltd.	142,499142,499	$10M	0.44%	TRIM -10%
54	HSBC HOLDINGS PLC	144,233144,233	$9M	0.45%	TRIM -51%
55	Trexquant Investment LP	138,037138,037	$9M	0.43%	ADD 51%
56	Advisors Asset Management, Inc.	135,131135,131	$9M	0.42%	TRIM -7%
57	WELLS FARGO & COMPANY/MN	120,649120,649	$8M	0.37%	ADD 148%
58	Bank of New York Mellon Corp	115,298115,298	$8M	0.36%	TRIM -15%
59	PEREGRINE CAPITAL MANAGEMENT LLC	113,520113,520	$8M	0.35%	NEW
60	Walleye Capital LLC	110,412110,412	$7M	0.34%	NEW
61	VOLORIDGE INVESTMENT MANAGEMENT, LLC	102,228102,228	$7M	0.32%	TRIM -52%
62	RBF Capital, LLC	100,372100,372	$7M	0.31%	NEW
63	Hudson Bay Capital Management LP	100,000100,000	$7M	0.31%	—
64	Informed Momentum Co LLC	99,45399,453	$7M	0.31%	TRIM -21%
65	CITADEL ADVISORS LLC	96,42496,424	$6M	0.30%	TRIM -69%
66	TORONTO DOMINION BANK	94,37594,375	$6M	0.29%	TRIM -27%
67	FRANKLIN RESOURCES INC	89,01089,010	$6M	0.28%	ADD 19%
68	ALGERT GLOBAL LLC	86,96886,968	$6M	0.27%	ADD 949%
69	HRT FINANCIAL LP	78,37678,376	$5M	0.24%	ADD 97%
70	PRINCIPAL FINANCIAL GROUP INC	76,47576,475	$5M	0.24%	ADD 3%
71	PRUDENTIAL FINANCIAL INC	75,44575,445	$5M	0.23%	TRIM -9%
72	NORDEA INVESTMENT MANAGEMENT AB	75,23075,230	$5M	0.23%	TRIM -4%
73	LPL Financial LLC	72,91472,914	$5M	0.23%	ADD 325%
74	NEW YORK STATE COMMON RETIREMENT FUND	72,18972,189	$5M	0.22%	TRIM -21%
75	SEI INVESTMENTS CO	71,03971,039	$5M	0.22%	ADD 153%
76	Minerva Advisors LLC	70,34070,340	$5M	0.22%	TRIM -31%
77	Hennion & Walsh Asset Management, Inc.	66,07666,076	$4M	0.20%	ADD 30%
78	Legal & General Group Plc	63,34363,343	$4M	0.20%	TRIM -7%
79	Russell Investments Group, Ltd.	60,45560,455	$4M	0.19%	ADD 40%
80	TUDOR INVESTMENT CORP ET AL	58,96658,966	$4M	0.18%	TRIM -39%
81	SUSQUEHANNA INTERNATIONAL GROUP, LLP	57,89857,898	$4M	0.18%	ADD 39%
82	BARCLAYS PLC	57,52157,521	$4M	0.18%	ADD 11%
83	Teton Advisors, LLC	57,00057,000	$4M	0.18%	TRIM -26%
84	JPMORGAN CHASE & CO	60,91760,917	$4M	0.19%	ADD 3%
85	RHUMBLINE ADVISERS	55,39555,395	$4M	0.17%	—
86	CAXTON ASSOCIATES LLP	55,33455,334	$4M	0.17%	ADD 3%
87	Swiss National Bank	52,10052,100	$3M	0.16%	—
88	STATE OF WISCONSIN INVESTMENT BOARD	51,60851,608	$3M	0.16%	TRIM -10%
89	PDT Partners, LLC	49,20849,208	$3M	0.15%	TRIM -41%
90	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	48,94448,944	$3M	0.15%	—
91	WHITE PINE CAPITAL LLC	45,53945,539	$3M	0.14%	TRIM -36%
92	VICTORY CAPITAL MANAGEMENT INC	44,66944,669	$3M	0.14%	TRIM -25%
93	FEDERATED HERMES, INC.	42,94742,947	$3M	0.13%	ADD 5%
94	POLEN CAPITAL MANAGEMENT LLCtracked	42,41042,410	$3M	0.13%	TRIM -21%
95	BNP PARIBAS ASSET MANAGEMENT Holding S.A.	40,96140,961	$3M	0.13%	ADD 10794%
96	Lisanti Capital Growth, LLC	40,82040,820	$3M	0.13%	ADD 123%
97	ZACKS INVESTMENT MANAGEMENT	39,07639,076	$3M	0.12%	ADD 18%
98	Universal- Beteiligungs- und Servicegesellschaft mbH	38,99338,993	$3M	0.12%	NEW
99	GABELLI FUNDS LLC	36,98036,980	$2M	0.11%	ADD 9%
100	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	36,97236,972	$2M	0.11%	NEW

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

BlackRock, Inc.

2.6M

2.5M

2.2M

2.3M

2.8M

$189M

STATE STREET CORP

972K

996K

1.5M

1.8M

2.3M

$157M

AMERICAN CENTURY COMPANIES INC

33K

45K

340K

539K

1.8M

1.7M

$116M

VANGUARD CAPITAL MANAGEMENT LLC

—

1.4M

$93M

Capital International Investors

—

1.4M

1.8M

1.3M

$86M

GEODE CAPITAL MANAGEMENT, LLC

691K

714K

736K

748K

756K

887K

$59M

Pertento Partners LLP

—

815K

$54M

NEXT CENTURY GROWTH INVESTORS LLC

1.5M

1.3M

1.2M

1.1M

786K

$52M

DIMENSIONAL FUND ADVISORS LP

999K

921K

755K

677K

640K

674K

$45M

D. E. Shaw & Co., Inc.

203K

587K

849K

882K

493K

608K

$41M

Point72 Asset Management, L.P.

25K

17K

34K

—

497K

567K

$38M

Capital World Investors

—

561K

$37M

RAYMOND JAMES FINANCIAL INC

—

16K

12K

436K

493K

$31M

GOLDMAN SACHS GROUP INC

176K

222K

151K

210K

315K

455K

$30M

AMERIPRISE FINANCIAL INC

363K

408K

442K

410K

256K

451K

$30M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	290	31,119,400	96.4%	$2.1B
2025-Q4

Short interest has its own tab now — open SI →

Activists & large holders· Schedule 13D/G beneficial owners · ATRO

Activists — 13D, active intent

325 CAPITAL LLC0%EXITEDSCHEDULE 13D/A · Amd 2 · event 2025-10-15SEC →

0 shares · 6 reporting persons

Large holders — 13G, passive (top 5 of 12 by % of class)

Holder

% of class

Type

As of

BlackRock, Inc.

12.6%

QII

2026-06-30

SEC →

STATE STREET CORP

10.4%

QII

2026-06-30

SEC →

DIMENSIONAL FUND ADVISORS LP

7.5%

QII

2026-06-30

SEC →

AMERICAN CENTURY INVESTMENT MANAGEMENT INC

ATRO US Equity☆

Institutional ownership· 13F filers holding ATRO · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · ATRO

Institutional ownership· 13F filers holding ATRO · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · ATRO

ATRO US Equity