COST

Costco Wholesale Corp

8 super-investor ownerscombined $524Mlargest position 0.4%

1 TRIM

8 of the 83 super-investors we track hold COST, worth a combined $524M per their latest 13F filings. The largest position: Christopher Bloomstran at 0.4% of their portfolio. This quarter the cohort logged 0 buys and 1 sell on the name. Conviction score: 31 of 100 (how strongly the cohort backs it) — ranked #321 of 742 stocks. The stock is up 10.5x since a tracked investor first held it at conviction size (Q1 2014 or earlier).

Held through it: Christopher Bloomstran (49q straight), Christopher Davis (22q straight), Joel Greenblatt (36q straight) and 3 more. All multibaggers the cohort held →

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Why super-investors own COST

COST is held by 8 super-investors in our cohort, with a combined position value of $524M. The highest-conviction owner is Christopher Bloomstran at 0.4% of their portfolio. Cohort ownership has shrunk from 9 to 8 over the last four quarters — net interest is fading. This quarter the cohort registered 1 trimmed.

AI-synthesized from 13F filings. Not investment advice.

Cohort owners over time

2016Q3 → 2026Q2

How many of the cohort members held this stock each quarter.

Now: 8

Peak: 10

Owners (8) · click any column to sort

#↑	Manager	% Port.	History	Value	Shares
1	Joel Greenblatt	0.3%	39q	$477M	509,661
2	Thomas Gayner	0.3%	40q	$37M	39,150
3	Thomas Russo	<0.1%	40q	$3M	3,399
4	Christopher Bloomstran	0.4%	40q	$3M	3,354
5	Mairs & Power Funds	<0.1%	40q	$3M	2,963
6	Torray Funds	0.1%	16q	$587K	628
7	David Katz	<0.1%	14q	$515K	551
8	Bill Nygren	0.0%	5q	$335K	358