Pertento Partners LLP
· New
+$59M
Change
+815K
Date
Q1 2026
AT
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Pertento Partners LLP
· New
+$59M
Change
+815K
Date
Q1 2026
|
Pertento Partners LLP | New· Q1 2026 | +$59M | +815K | – | Q1 2026 | |||||
|
Ack Asset Management LLC
· Exited
−$43M
Change
−597K
Δ Own
−100.0%
Date
Q1 2026
|
Ack Asset Management LLC | Exited· Q1 2026 | −$43M | −597K | −100.0% | Q1 2026 | |||||
|
Capital International Investors
· Reduced
−$41M
Change
−561K
Date
Q1 2026
|
Capital International Investors | Reduced· Q1 2026 | −$41M | −561K | – | Q1 2026 | |||||
|
Capital World Investors
· New
+$41M
Change
+561K
Date
Q1 2026
|
Capital World Investors | New· Q1 2026 | +$41M | +561K | – | Q1 2026 | |||||
|
State Street
· Added
+$37M
Change
+518K
Date
Q1 2026
|
State Street | Added· Q1 2026 | +$37M | +518K | – | Q1 2026 | |||||
|
Luxor Capital Group, LP
· Reduced
−$32M
Change
−444K
Date
Q1 2026
|
Luxor Capital Group, LP | Reduced· Q1 2026 | −$32M | −444K | – | Q1 2026 | |||||
|
Senator Investment Group LP
· Reduced
−$32M
Change
−437K
Δ Own
−95.3%
Date
Q1 2026
|
Senator Investment Group LP | Reduced· Q1 2026 | −$32M | −437K | −95.3% | Q1 2026 | |||||
|
Driehaus Capital Management LLC
· Reduced
−$25M
Change
−340K
Date
Q1 2026
|
Driehaus Capital Management LLC | Reduced· Q1 2026 | −$25M | −340K | – | Q1 2026 | |||||
|
SG Capital Management LLC
· Exited
−$21M
Change
−291K
Δ Own
−100.0%
Date
Q1 2026
|
SG Capital Management LLC | Exited· Q1 2026 | −$21M | −291K | −100.0% | Q1 2026 | |||||
|
Fisher Asset Management, LLC
· Added
+$21M
Change
+288K
Δ Own
+475.3%
Date
Q1 2026
|
Fisher Asset Management, LLC | Added· Q1 2026 | +$21M | +288K | +475.3% | Q1 2026 | |||||
|
Next Century Growth Investors LLC
· Reduced
−$20M
Change
−281K
Date
Q1 2026
|
Next Century Growth Investors LLC | Reduced· Q1 2026 | −$20M | −281K | – | Q1 2026 | |||||
|
Jupiter Asset Management Ltd
· New
+$20M
Change
+281K
Date
Q1 2026
|
Jupiter Asset Management Ltd | New· Q1 2026 | +$20M | +281K | – | Q1 2026 | |||||
|
Private Capital Management, LLC
· Reduced
−$17M
Change
−233K
Date
Q1 2026
|
Private Capital Management, LLC | Reduced· Q1 2026 | −$17M | −233K | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· Reduced
−$16M
Change
−219K
Δ Own
−69.5%
Date
Q1 2026
|
Citadel Advisors LLC | Reduced· Q1 2026 | −$16M | −219K | −69.5% | Q1 2026 | |||||
|
Emerald Advisers, LLC
· Added
+$15M
Change
+206K
Date
Q1 2026
|
Emerald Advisers, LLC | Added· Q1 2026 | +$15M | +206K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Peabody Mark
· Officer
12 operations
80K
|
Peabody Mark | Officer | 12 operations | – | 80K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Kim Neil Y.
· Director
3 operations
11K
|
Kim Neil Y. | Director | 3 operations | – | 11K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Johnson Warren C.
· Director
3 operations
12K
|
Johnson Warren C. | Director | 3 operations | – | 12K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Keane Robert S.
· Director
3 operations
86K
|
Keane Robert S. | Director | 3 operations | – | 86K | – | 248K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Moran Mark J.
· Director
Other Form 4 events
9K
|
Moran Mark J. | Director | Other Form 4 events | – | 9K | – | 9K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Davis Julie M.
· Officer
5 operations
4K
|
Davis Julie M. | Officer | 5 operations | – | 4K | – | 383 | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Hedges Nancy L.
· Officer
4 operations
14K
|
Hedges Nancy L. | Officer | 4 operations | – | 14K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
West Fay
· Director
Other Form 4 events
2K
|
West Fay | Director | Other Form 4 events | – | 2K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Frisby Jeffry D.
· Director
3 operations
11K
|
Frisby Jeffry D. | Director | 3 operations | – | 11K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Gundermann Peter J.
· Director
14 operations
316K
|
Gundermann Peter J. | Director | 14 operations | – | 316K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
O'Brien Linda
· Director
2 operations
5K
|
O'Brien Linda | Director | 2 operations | – | 5K | – | 240 | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Mulato James
· Other
12 operations
46K
|
Mulato James | Other | 12 operations | – | 46K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Brady Robert T.
· Director
3 operations
55K
|
Brady Robert T. | Director | 3 operations | – | 55K | – | 2K | – | Jun 15, 2026 | Jun 17, 2026 | |||||||||
|
Davis Julie M.
· Officer
2 operations
0
|
Davis Julie M. | Officer | 2 operations | $81.35 | 0 | – | 0 | – | Mar 3, 2026 | Mar 5, 2026 | |||||||||
|
Davis Julie M.
· Officer
Tax withholding or exercise payment (F)
-$120K
|
Davis Julie M. | Officer | Tax withholding or exercise payment (F) | $81.35 | -1K | -$120K | 7K | – | Mar 3, 2026 | Mar 5, 2026 | |||||||||
N
A
M
G
A
A
280 reporting institutions disclosed ATRO position changes in the Q1 2026 snapshot.
For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.
An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.
Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.
Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.
A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.