L3VLUP
Quarter end
31 Dec 2025
the date the book describes
Filed
19 Feb 2026
latest of these filings; the earliest 4 Feb 2026
Managers listing it
31
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 5 listed it in both
Shares listed
3,900,742
combined, among listed positions
Reported value
$212m
combined, at the quarter end

Among the 92 comparable managers: 17 buyers (opened or added shares) and 14 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -117,044.

Managers listing ATRO in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

31 of 31 holders

ActionFiling
Point72 Asset Management LP497,260$27munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.493,424$27munder 0.1%Trimmed-388,63717 Feb 2026 (the filing on sec.gov)
Marshall Wace LLP385,518$21munder 0.1%Trimmed-88,40413 Feb 2026 (the filing on sec.gov)
Millennium Management LLC360,594$20munder 0.1%Added+14,09217 Feb 2026 (the filing on sec.gov)
Citadel Advisors LLC315,800$17munder 0.1%Added+165,31217 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC258,229$14munder 0.1%Added+2,99817 Feb 2026 (the filing on sec.gov)
First Eagle Investment Management LLC230,326$12munder 0.1%Trimmed-6,0004 Feb 2026 (the filing on sec.gov)
Voloridge Investment Management LLC212,081$12munder 0.1%Added+31,12717 Feb 2026 (the filing on sec.gov)
Invesco Ltd205,672$11munder 0.1%Added+79,46919 Feb 2026 (the filing on sec.gov)
Acadian Asset Management LLC155,327$8.4munder 0.1%Added+53,77410 Feb 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP100,000$5.4munder 0.1%Newnew13 Feb 2026 (the filing on sec.gov)
Tudor Investment Corp96,386$5.2munder 0.1%Added+90,26717 Feb 2026 (the filing on sec.gov)
PDT Partners LLC82,900$4.5m0.29%Trimmed-27,48617 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC63,882$3.5munder 0.1%Trimmed-93,14113 Feb 2026 (the filing on sec.gov)
Caxton Associates LLP53,835$2.9m0.06%Added+58813 Feb 2026 (the filing on sec.gov)
Polen Capital Management LLC53,691$2.9munder 0.1%Trimmed-30212 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC53,020$2.9munder 0.1%Trimmed-111,58012 Feb 2026 (the filing on sec.gov)
Susquehanna International Group LLP41,663$2.3munder 0.1%Added+26,14217 Feb 2026 (the filing on sec.gov)
Verition Fund Management LLC36,800$2.0munder 0.1%Trimmed-13,28013 Feb 2026 (the filing on sec.gov)
Two Sigma Investments LP33,303$1.8munder 0.1%Trimmed-27,69917 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP30,050$1.6munder 0.1%Held017 Feb 2026 (the filing on sec.gov)
GAMCO Investors Inc27,298$1.5munder 0.1%Added+6,8005 Feb 2026 (the filing on sec.gov)
Quantbot Technologies LP22,678$1.2munder 0.1%Added+17,21710 Feb 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC22,500$1.2munder 0.1%Trimmed-440,60917 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc17,889$971kunder 0.1%Added+1,42217 Feb 2026 (the filing on sec.gov)
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Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
2 in Q3 2024 to 5 in Q2 2026

Tracked managers listing it, at least.

02468201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ATRO by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20141$213kn.a.n.a.
Q2 20151$51mn.a.n.a.
Q3 20151$35mn.a.n.a.
Q4 20152$45mn.a.n.a.
Q1 20163$55mn.a.n.a.
Q2 20161$46mn.a.n.a.
Q3 20161$63mn.a.n.a.
Q4 20161$55mn.a.n.a.
Q1 20171$51mn.a.n.a.
Q2 20171$47mn.a.n.a.
Q3 20171$45mn.a.n.a.
Q4 20171$59mn.a.n.a.
Q1 20181$51mn.a.n.a.
Q2 20181$48mn.a.n.a.
Q3 20181$55mn.a.n.a.
Q4 20181$43mn.a.n.a.
Q1 20191$45mn.a.n.a.
Q2 20194$66mn.a.n.a.
Q3 20192$50mn.a.n.a.
Q4 20192$37mn.a.n.a.
Q1 20201$221kn.a.n.a.
Q2 20202$588kn.a.n.a.
Q3 20202$756kn.a.n.a.
Q4 20202$7.8mn.a.n.a.
Q1 20211$7.3mn.a.n.a.
Q2 20213$11mn.a.n.a.
Q3 20212$4.9mn.a.n.a.
Q4 20211$1.1mn.a.n.a.
Q1 20222$6.8mn.a.n.a.
Q2 20222$6.6mn.a.n.a.
Q3 20222$5.3mn.a.n.a.
Q4 20222$6.5mn.a.n.a.
Q1 20231$4.5mn.a.n.a.
Q2 20234$25mn.a.n.a.
Q3 20233$20mn.a.n.a.
Q4 20233$22m21
Q1 20243$23m21
Q2 20242$18m11
Q3 20242$19m20
Q4 20243$21m21
Q1 20253$25m12
Q2 20256$37m42
Q3 20255$42m32
Q4 20255$28m1714
Q1 20268$120m1516
Q2 20265$74m1517

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

ATRO and RTX →ATRO and BA →ATRO and TDG →Choose a stock to compare with ATRO →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own ATRO, latest filings →Back to the 13F Explorer →