Institutional Holdings in Costco Show Mixed Activity in Latest 13F Filings

A review of the most recent 13F filings for the period ending March 31, 2026, indicates a fragmented approach among institutional investors regarding Costco Wholesale Corp (COST). Out of a sample of 55 recently reviewed filings, 33 funds maintained positions in the retail giant. The data highlights the inherent limitations of 13F filings, which only disclose long positions. Analysts caution that these figures may not reflect a fund's total exposure, as bearish bets made via short positions or options are not required to be disclosed, potentially masking a fund's true sentiment. Between December 31, 2025, and March 31, 2026, the aggregate share count among 989 tracked funds rose by approximately 3.31%. Total holdings increased from 4,174,845 to 4,312,869 shares, representing a net gain of 138,024 shares. Within the smaller sample of 55 filings, activity was split. Nine funds increased their existing holdings and four opened new positions, while 12 funds decreased their stakes. Notably, Mendota Financial Group LLC fully liquidated its position in COST common stock during this reporting window. The overall trend suggests a modest bullish lean in aggregate, though the mixed activity among the smaller group of filers indicates a lack of strong consensus among hedge fund managers regarding the stock's immediate trajectory.