Vanguard
· Added
Change
+456K
Date
Q1 2026
| Investor | Type | Est. change | Change | Δ Own | Date | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Vanguard
· Added
Change
+456K
Date
Q1 2026
|
Vanguard | Added· Q1 2026 | – | +456K | – | Q1 2026 | |||||
|
BlackRock
· Added
Change
+203K
Date
Q1 2026
|
BlackRock | Added· Q1 2026 | – | +203K | – | Q1 2026 | |||||
|
Geode
· Added
Change
+192K
Date
Q1 2026
|
Geode | Added· Q1 2026 | – | +192K | – | Q1 2026 | |||||
|
AQR Capital Management LLC
· New
Change
+45K
Date
Q1 2026
|
AQR Capital Management LLC | New· Q1 2026 | – | +45K | – | Q1 2026 | |||||
|
State Street
· Added
Change
+41K
Date
Q1 2026
|
State Street | Added· Q1 2026 | – | +41K | – | Q1 2026 | |||||
|
Northern Trust
· Added
Change
+31K
Date
Q1 2026
|
Northern Trust | Added· Q1 2026 | – | +31K | – | Q1 2026 | |||||
|
Morgan Stanley
· Reduced
Change
−23K
Date
Q1 2026
|
Morgan Stanley | Reduced· Q1 2026 | – | −23K | – | Q1 2026 | |||||
|
Citadel Advisors LLC
· New
Change
+22K
Date
Q1 2026
|
Citadel Advisors LLC | New· Q1 2026 | – | +22K | – | Q1 2026 | |||||
|
O'Shaughnessy Asset Management, LLC
· Exited
Change
−19K
Δ Own
−100.0%
Date
Q1 2026
|
O'Shaughnessy Asset Management, LLC | Exited· Q1 2026 | – | −19K | −100.0% | Q1 2026 | |||||
|
Strs Ohio
· Added
Change
+19K
Date
Q1 2026
|
Strs Ohio | Added· Q1 2026 | – | +19K | – | Q1 2026 | |||||
|
Schwab
· New
Change
+13K
Date
Q1 2026
|
Schwab | New· Q1 2026 | – | +13K | – | Q1 2026 | |||||
|
Los Angeles Capital Management LLC
· Exited
Change
−11K
Δ Own
−100.0%
Date
Q1 2026
|
Los Angeles Capital Management LLC | Exited· Q1 2026 | – | −11K | −100.0% | Q1 2026 | |||||
|
Xtx Topco Ltd
· New
Change
+11K
Date
Q1 2026
|
Xtx Topco Ltd | New· Q1 2026 | – | +11K | – | Q1 2026 | |||||
|
Prelude Capital Management, LLC
· New
Change
+11K
Date
Q1 2026
|
Prelude Capital Management, LLC | New· Q1 2026 | – | +11K | – | Q1 2026 | |||||
|
Cygnus Capital Advisors, LLC
· New
Change
+11K
Date
Q1 2026
|
Cygnus Capital Advisors, LLC | New· Q1 2026 | – | +11K | – | Q1 2026 | |||||
| Insider | Title | Type | Price | Qty | Value | Owned | ΔOwn | Trade date | Filed date | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Pfeffer David
· Director
2 operations
323K
|
Pfeffer David | Director | 2 operations | $2.97 | 323K | – | 0 | – | Mar 12, 2026 | Mar 16, 2026 | |||||||||
|
Tenore Michael
· Officer
Exercise or conversion (M/X/C)
$1.6M
|
Tenore Michael | Officer | Exercise or conversion (M/X/C) | $1.33 | 1.2M | $1.6M | 1.8M | – | Jan 7, 2026 | Jan 7, 2026 | |||||||||
|
Bressman Andrew
· 10% Owner
Exercise or conversion (M/X/C)
$665K
|
Bressman Andrew | 10% Owner | Exercise or conversion (M/X/C) | $1.33 | 500K | $665K | 7.0M | – | Jan 5, 2026 | Jan 7, 2026 | |||||||||
|
Bressman Andrew
· 10% Owner
Grant (A)
$665K
|
Bressman Andrew | 10% Owner | Grant (A) | $1.33 | 500K | $665K | 500K | – | Jan 5, 2026 | Jan 7, 2026 | |||||||||
|
Tenore Michael
· Officer
Grant (A)
$166K
|
Tenore Michael | Officer | Grant (A) | $1.33 | 125K | $166K | 125K | – | Jan 5, 2026 | Jan 7, 2026 | |||||||||
|
Evelt Matthew
· Officer
Grant (A)
100K
|
Evelt Matthew | Officer | Grant (A) | – | 100K | – | 1.1M | – | Jan 5, 2026 | Jan 7, 2026 | |||||||||
|
Jagid Jeffrey M.
· Director, Officer, 10% Owner
Grant (A)
$1.3M
|
Jagid Jeffrey M. | Director, Officer, 10% Owner | Grant (A) | $1.33 | 1.0M | $1.3M | 1.0M | – | Jan 5, 2026 | Jan 5, 2026 | |||||||||
|
Jagid Jeffrey M.
· Director, Officer, 10% Owner
Exercise or conversion (M/X/C)
$7.4M
|
Jagid Jeffrey M. | Director, Officer, 10% Owner | Exercise or conversion (M/X/C) | $1.33 | 5.6M | $7.4M | 8.2M | – | Jan 1, 2026 | Jan 5, 2026 | |||||||||
|
Tenore Michael
· Officer
Exercise or conversion (M/X/C)
$352K
|
Tenore Michael | Officer | Exercise or conversion (M/X/C) | $1.33 | 265K | $352K | 1.3M | – | Jan 1, 2026 | Jan 5, 2026 | |||||||||
|
Broderick Christopher
· CFO
Shares transferred outside the market (D), often for tax or as a gift, not a market sale
577K
|
Broderick Christopher | CFO | Shares transferred outside the market (D), often for tax or as a gift, not a market sale | – | 577K | – | 0 | – | Aug 15, 2025 | Aug 15, 2025 | |||||||||
|
Tenore Michael
· Officer
Grant (A)
265K
|
Tenore Michael | Officer | Grant (A) | – | 265K | – | 842K | – | Aug 11, 2025 | Aug 13, 2025 | |||||||||
|
Jagid Jeffrey M.
· Director, Officer
Gift (G)
-400K
|
Jagid Jeffrey M. | Director, Officer | Gift (G) | – | -400K | – | 3.3M | – | Aug 11, 2025 | Aug 13, 2025 | |||||||||
|
Jagid Jeffrey M.
· Director, Officer
Grant (A)
1.0M
|
Jagid Jeffrey M. | Director, Officer | Grant (A) | – | 1.0M | – | 3.9M | – | Aug 11, 2025 | Aug 13, 2025 | |||||||||
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49 reporting institutions disclosed ATLN 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.