Birchbrook’s Costco COST Stock Holding History

Birchbrook’s Portfolio COST Stock Details COST Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q3	$91K	Sell	100 -350	-78%	-$327K	0.04%	107
2026 Q2	$421K	Hold	450	–	–	0.2%	64
2026 Q1	$448K	Sell	450 -5	-1%	-$4.87K	0.22%	56
2025 Q4	$392K	Hold	455	–	–	0.2%	59
2025 Q3	$421K	Hold	455	–	–	0.22%	57
2025 Q2	$450K	Sell	455 -1	-0.2%	-$994	0.24%	54
2025 Q1	$431K	Buy	456 +11	+2%	+$10.7K	0.24%	51
2024 Q4	$408K	Sell	445 -2	-0.4%	-$1.86K	0.23%	49
2024 Q3	$396K	Hold	447	–	–	0.22%	50
2024 Q2	$380K	Hold	447	–	–	0.23%	50
2024 Q1	$327K	Hold	447	–	–	0.19%	53
2023 Q4	$295K	Buy	+447	New	+$265K	0.19%	57

Other funds holding COST

Sumitomo Mitsui Trust Group Minato-Ku, Tokyo, Japan $174B AUM 33.96% 1-Year Est. Return

Everett Harris & Co Los Angeles, California $8.46B AUM 13.48% 1-Year Est. Return

Swedbank Stockholm, Sweden $118B AUM 40.52% 1-Year Est. Return

Emerald Advisors Bellevue, Washington $781M AUM 4.78% 1-Year Est. Return

Parnassus Investments San Francisco, California $33.8B AUM 31.08% 1-Year Est. Return

Assenagon Asset Management Senningerberg, Luxembourg $103B AUM 40.17% 1-Year Est. Return

ProShare Advisors Bethesda, Maryland $69.5B AUM 31.38% 1-Year Est. Return

Bank Julius Baer & Co Zurich, Switzerland $39.3B AUM 31.81% 1-Year Est. Return

Provident Trust Company Waukesha, Wisconsin $3.22B AUM 13.63% 1-Year Est. Return

New York State Teachers Retirement System (NYSTRS) Albany, New York $52.9B AUM 36.03% 1-Year Est. Return

Birchbrook's COST Position: Q3 2026 in Review

Birchbrook reduced its Costco (COST) stake by 78% in Q3 2026, selling an estimated $327K and leaving 100 shares worth $91K. The position accounts for 0.04% of the portfolio, ranked #107.

Birchbrook first reported a position in COST in Q4 2023 and has held it in 12 quarters since. The position peaked at $450K in Q2 2025. 1,940 funds tracked by Wall St. Rank hold COST as of Q3 2026.

Birchbrook held 100 shares of Costco worth $91K as of Q3 2026.
Birchbrook sold 350 Costco shares in Q3 2026, an estimated $327K.
Costco made up 0.04% of Birchbrook's portfolio in Q3 2026, its #107 holding.
Birchbrook first reported a position in Costco in Q4 2023 and has held it in 12 quarters since.
Birchbrook's Costco position peaked at $450K in Q2 2025.
1,940 funds tracked by Wall St. Rank held Costco as of Q3 2026.

Based on Birchbrook's 13F filing for Q3 2026, filed 14 Oct 2026.