ATI
678 hedge funds and large institutions have $18.5B invested in ATI in 2026 Q1 according to their latest regulatory filings, with 167 funds opening new positions, 245 increasing their positions, 190 reducing their positions, and 52 closing their positions.
221% more first-time investments, than exits
New positions opened: 167 | Existing positions closed: 52
106% more call options, than puts
Call options by funds: $159M | Put options by funds: $77.3M
29% more repeat investments, than reductions
Existing positions increased: 245 | Existing positions reduced: 190
26% more capital invested
Capital invested by funds: $14.7B → $18.5B (+$3.77B)
19% more funds holding
Funds holding: 570 → 678 (+108)
8% more funds holding in top 10
Funds holding in top 10: 12 → 13 (+1)
1.1% less ownership
Funds ownership: 94.45% → 93.35% (-1.1%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Viking Global Investors
Stamford,
Connecticut
|
+$464M |
| 2 |
Capital Research Global Investors
Los Angeles,
California
|
+$355M |
| 3 |
BlackRock
New York
|
+$247M |
| 4 |
Jane Street
New York
|
+$169M |
| 5 |
Point72 Asset Management
Stamford,
Connecticut
|
+$163M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Capital International Investors
Los Angeles,
California
|
-$1.56B |
| 2 |
Capital World Investors
Los Angeles,
California
|
-$229M |
| 3 |
Dimensional Fund Advisors
Austin,
Texas
|
-$106M |
| 4 |
DC
Dendur Capital
New York
|
-$105M |
| 5 |
FCM
Frontier Capital Management
Boston,
Massachusetts
|
-$74.2M |
ATI Hedge Fund Activity: Q1 2026 in Review
678 of the 8,187 institutional investors tracked by Wall St. Rank reported a position in ATI (ATI) for Q1 2026, worth a combined $18.5B — up 26% from $14.7B a quarter earlier.
Buyers outnumbered sellers: 167 funds opened new ATI positions and 52 closed out — a net gain of 115 holders — while 245 added to existing stakes and 190 trimmed.
The largest buyer was Viking Global Investors, opening a new position worth an estimated $464M. The largest seller was Capital International Investors, cutting an estimated $1.56B.
- 678 institutional investors held ATI (ATI) as of Q1 2026, up from 570 in Q4 2025.
- Funds reported $18.5B of ATI stock for Q1 2026, up 26% quarter-over-quarter.
- 167 funds opened new ATI positions in Q1 2026 and 52 closed out, a net change of +115 holders.
- The largest ATI buyer in Q1 2026 was Viking Global Investors, an estimated $464M added.
- The largest ATI seller in Q1 2026 was Capital International Investors, an estimated $1.56B sold.
Based on aggregated 13F filings for Q1 2026.