BlackRock
· Reduced
Change
−773K
Date
Q1 2026
AR
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
BlackRock
· Reduced
Change
−773K
Date
Q1 2026
|
BlackRock | Reduced· Q1 2026 | – | −773K | – | Q1 2026 | |||||
|
Jane Street Group, LLC
· Added
Change
+129K
Date
Q1 2026
|
Jane Street Group, LLC | Added· Q1 2026 | – | +129K | – | Q1 2026 | |||||
|
Two Sigma Investments, LP
· Added
Change
+111K
Δ Own
+196.6%
Date
Q1 2026
|
Two Sigma Investments, LP | Added· Q1 2026 | – | +111K | +196.6% | Q1 2026 | |||||
|
UBS Group AG
· Added
Change
+107K
Date
Q1 2026
|
UBS Group AG | Added· Q1 2026 | – | +107K | – | Q1 2026 | |||||
|
Two Sigma Advisers, LP
· Exited
Change
−74K
Δ Own
−100.0%
Date
Q1 2026
|
Two Sigma Advisers, LP | Exited· Q1 2026 | – | −74K | −100.0% | Q1 2026 | |||||
|
Adage Capital Partners Gp, L.L.C.
· Added
Change
+50K
Date
Q1 2026
|
Adage Capital Partners Gp, L.L.C. | Added· Q1 2026 | – | +50K | – | Q1 2026 | |||||
|
Marshall Wace, LLP
· Added
Change
+49K
Date
Q1 2026
|
Marshall Wace, LLP | Added· Q1 2026 | – | +49K | – | Q1 2026 | |||||
|
Millennium Management LLC
· Added
Change
+42K
Date
Q1 2026
|
Millennium Management LLC | Added· Q1 2026 | – | +42K | – | Q1 2026 | |||||
|
Renaissance Technologies LLC
· Added
Change
+42K
Δ Own
+15.1%
Date
Q1 2026
|
Renaissance Technologies LLC | Added· Q1 2026 | – | +42K | +15.1% | Q1 2026 | |||||
|
Assenagon Asset Management S.A.
· Added
Change
+36K
Date
Q1 2026
|
Assenagon Asset Management S.A. | Added· Q1 2026 | – | +36K | – | Q1 2026 | |||||
|
Goldman Sachs Group Inc
· Added
Change
+36K
Date
Q1 2026
|
Goldman Sachs Group Inc | Added· Q1 2026 | – | +36K | – | Q1 2026 | |||||
|
Morgan Stanley
· Added
Change
+35K
Date
Q1 2026
|
Morgan Stanley | Added· Q1 2026 | – | +35K | – | Q1 2026 | |||||
|
Prospera Financial Services Inc
· Added
Change
+32K
Date
Q1 2026
|
Prospera Financial Services Inc | Added· Q1 2026 | – | +32K | – | Q1 2026 | |||||
|
Qube Research & Technologies Ltd
· New
Change
+32K
Date
Q1 2026
|
Qube Research & Technologies Ltd | New· Q1 2026 | – | +32K | – | Q1 2026 | |||||
|
Hrt Financial LP
· New
Change
+28K
Date
Q1 2026
|
Hrt Financial LP | New· Q1 2026 | – | +28K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dinunzio Joseph A.
· Other
Other Form 4 events
193
|
Dinunzio Joseph A. | Other | Other Form 4 events | – | 193 | – | 16K | – | May 19, 2026 | May 20, 2026 | |||||||||
|
Rossi Salvatore J. Jr
· Director
2 operations
$0
|
Rossi Salvatore J. Jr | Director | 2 operations | $31.41 | 0 | $0 | 0 | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Rossi Salvatore J. Jr
· Director
Grant (A)
$31K
|
Rossi Salvatore J. Jr | Director | Grant (A) | $31.41 | 1K | $31K | 1K | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Houghton Michael
· Director
2 operations
$0
|
Houghton Michael | Director | 2 operations | $31.41 | 0 | $0 | 0 | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Houghton Michael
· Director
Grant (A)
$31K
|
Houghton Michael | Director | Grant (A) | $31.41 | 1K | $31K | 1K | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Taylor Dian C.
· Director
2 operations
$0
|
Taylor Dian C. | Director | 2 operations | $31.41 | 0 | $0 | 0 | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Taylor Dian C.
· Director
Grant (A)
$31K
|
Taylor Dian C. | Director | Grant (A) | $31.41 | 1K | $31K | 1K | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Taylor Nicholle Renee
· Director
2 operations
$0
|
Taylor Nicholle Renee | Director | 2 operations | $31.41 | 0 | $0 | 0 | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Eisenbrey John R. Jr
· Director
2 operations
$0
|
Eisenbrey John R. Jr | Director | 2 operations | $31.41 | 0 | $0 | 0 | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Eisenbrey John R. Jr
· Director
Grant (A)
$31K
|
Eisenbrey John R. Jr | Director | Grant (A) | $31.41 | 1K | $31K | 1K | – | May 5, 2026 | May 6, 2026 | |||||||||
|
Taylor Dian C.
· Director
Sell
−$31K
|
Taylor Dian C. | Director | Sell | $31.25 | −1K | −$31K | 103K | – | Mar 23, 2026 | Mar 23, 2026 | |||||||||
|
Taylor Dian C.
· Director
Sell
−$62K
|
Taylor Dian C. | Director | Sell | $31.00 | −2K | −$62K | 104K | – | Mar 20, 2026 | Mar 20, 2026 | |||||||||
|
Taylor Dian C.
· Director
Sell
−$62K
|
Taylor Dian C. | Director | Sell | $31.00 | −2K | −$62K | 106K | – | Mar 19, 2026 | Mar 20, 2026 | |||||||||
|
Taylor Nicholle Renee
· Director
Other Form 4 events
52
|
Taylor Nicholle Renee | Director | Other Form 4 events | – | 52 | – | 1K | – | Dec 31, 2025 | Jan 13, 2026 | |||||||||
|
Thaeder John M.
· Officer
Other Form 4 events
158
|
Thaeder John M. | Officer | Other Form 4 events | – | 158 | – | 388 | – | Dec 31, 2025 | Jan 13, 2026 | |||||||||
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81 reporting institutions disclosed ARTNA 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.