COSTCO WHOLESALE CORP (COST) Stock Institutional Trading Activity
COSTCO WHOLESALE CORP (COST) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Mairs & Power Growth Fund, Semper Augustus Investments Group, Matrix Advisors Value Fund, and Parnassus Endeavor Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.
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- COSTCO WHOLESALE CORP (COST) stock institutional ownership
- COSTCO WHOLESALE CORP (COST) stock insider trading activity
- Stock rankings
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q4 2025 | Matrix Advisors Value Fund | Sell | -1 | 563 | $485,896 |
| Q4 2025 | Mairs & Power Growth Fund | Sell | -288 | 2,933 | $2,529,243 |
| Q4 2025 | Semper Augustus Investments Group | Buy | 12 | 3,447 | $2,972,486 |
| Q4 2025 | Renaissance Technologies LLC | Buy | 679,978 | 693,002 | $597,603,722 |
| Q3 2025 | Torray Fund | Sell | -8 | 628 | $581,296 |
| Q3 2025 | Gardner Russo & Quinn | Sell | -9 | 4,624 | $4,279,820 |
| Q3 2025 | Matrix Advisors Value Fund | Sell | -9 | 564 | $522,382 |
| Q3 2025 | Mairs & Power Growth Fund | Buy | 33 | 3,221 | $2,981,454 |
| Q3 2025 | Semper Augustus Investments Group | Sell | -333 | 3,435 | $3,179,539 |
| Q3 2025 | Alapocas Investment Partners | Sell | -2,108 | 7,140 | $6,608,998 |
| Q3 2025 | Renaissance Technologies LLC | Sell | -108,175 | 13,024 | $12,056,579 |
| Q3 2025 | Sequoia Financial Advisors | Buy | 4,193 | 79,754 | $73,822,750 |
| Q3 2025 | Parnassus Endeavor Fund | Sell | -13,713 | 420,438 | $389,170,026 |
| Q2 2025 | Torray Fund | Sell | -7 | 636 | $629,602 |
| Q2 2025 | Gardner Russo & Quinn | Sell | -4 | 4,633 | $4,585,964 |
| Q2 2025 | Mairs & Power Growth Fund | Buy | 488 | 3,188 | $3,155,929 |
| Q2 2025 | Semper Augustus Investments Group | Sell | -477 | 3,768 | $3,730,094 |
| Q2 2025 | Alapocas Investment Partners | Sell | -1,125 | 9,248 | $9,155,361 |
| Q2 2025 | Sequoia Financial Advisors | Buy | 5,493 | 75,561 | $74,800,870 |
| Q2 2025 | Parnassus Endeavor Fund | Sell | -73,212 | 434,151 | $429,783,441 |
| Q1 2025 | Gardner Russo & Quinn | Sell | -760 | 4,637 | $4,386,010 |
| Q1 2025 | Matrix Advisors Value Fund | Sell | -321 | 573 | $542,075 |
| Q1 2025 | Mairs & Power Growth Fund | Sell | -39 | 2,700 | $2,553,606 |
| Q1 2025 | Semper Augustus Investments Group | Sell | -105 | 4,245 | $4,014,836 |
| Q1 2025 | Alapocas Investment Partners | Sell | -1,680 | 10,373 | $9,810,576 |
| Q1 2025 | Sequoia Financial Advisors | Buy | 1,092 | 70,068 | $66,268,889 |
| Q1 2025 | Renaissance Technologies LLC | Buy | 90,148 | 121,199 | $114,628,166 |
| Q1 2025 | Parnassus Endeavor Fund | Sell | -203,468 | 507,363 | $479,853,778 |
| Q4 2024 | Cullen Value Fund | Buy | 6 | 263 | $241,162 |
| Q4 2024 | Gardner Russo & Quinn | Sell | -25 | 5,397 | $4,945,436 |
Frequently asked questions about COST activity
Which institutional owners are buying COST?
Institutional owners buying COST include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in COST activity?
"Buy" means an investor increased their reported position in COST compared to the prior reporting period. This reflects growing exposure to COSTCO WHOLESALE CORP (COST) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in COST increasing?
Institutional interest in COST can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.