Costco
COST
4,210 hedge funds and large institutions have $301B invested in Costco in 2026 Q2 according to their latest regulatory filings, with 198 funds opening new positions, 1,718 increasing their positions, 1,710 reducing their positions, and 157 closing their positions.
26% more first-time investments, than exits
New positions opened: 198 | Existing positions closed: 157
0% more repeat investments, than reductions
Existing positions increased: 1,718 | Existing positions reduced: 1,710
0.34% more ownership
Funds ownership: 72.19% → 72.53% (+0.34%)
10% less call options, than puts
Call options by funds: $9.02B | Put options by funds: $9.98B
1% less funds holding
Funds holding: 4,256 → 4,210 (-46)
5% less capital invested
Capital invested by funds: $318B → $301B (-$17.5B)
36% less funds holding in top 10
Funds holding in top 10: 280 → 179 (-101)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SG Americas Securities
New York
|
+$952M |
| 2 |
Marshall Wace
London,
United Kingdom
|
+$907M |
| 3 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
+$531M |
| 4 |
Invesco
Atlanta,
Georgia
|
+$359M |
| 5 |
Acadian Asset Management
Boston,
Massachusetts
|
+$325M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
DAM
Diamant Asset Management
Ridgefield,
Connecticut
|
-$6.7B |
| 2 |
BlackRock
New York
|
-$742M |
| 3 |
Fidelity Investments
Boston,
Massachusetts
|
-$553M |
| 4 |
T. Rowe Price Associates
Baltimore,
Maryland
|
-$511M |
| 5 |
Amundi
Paris,
France
|
-$413M |
COST Hedge Fund Activity: Q2 2026 in Review
4,210 of the 8,263 institutional investors tracked by Wall St. Rank reported a position in Costco (COST) for Q2 2026, worth a combined $301B — down 5.5% from $318B a quarter earlier.
Buyers outnumbered sellers: 198 funds opened new COST positions and 157 closed out — a net gain of 41 holders — while 1,718 added to existing stakes and 1,710 trimmed.
The largest buyer was SG Americas Securities, adding an estimated $952M. The largest seller was Diamant Asset Management, cutting an estimated $6.7B.
- 4,210 institutional investors held Costco (COST) as of Q2 2026, down from 4,256 in Q1 2026.
- Funds reported $301B of Costco stock for Q2 2026, down 5.5% quarter-over-quarter.
- 198 funds opened new Costco positions in Q2 2026 and 157 closed out, a net change of +41 holders.
- The largest Costco buyer in Q2 2026 was SG Americas Securities, an estimated $952M added.
- The largest Costco seller in Q2 2026 was Diamant Asset Management, an estimated $6.7B sold.
Based on aggregated 13F filings for Q2 2026.