Bank of Montreal’s Costco COST Stock Holding History

Bank of Montreal’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 Q2	$42.3M	Buy	45,200 +43,700	+2,913%	+$43.5M	0.01%	649
2026 Q1	$1.49M	Sell	1,500 -175,600	-99%	-$171M	﹤0.01%	1813
2025 Q4	$153M	Sell	177,100 -9,800	-5%	-$8.88M	0.05%	280
2025 Q3	$173M	Buy	+186,900	New	+$179M	0.07%	212
2023 Q3	–	Sell	-13,700	Closed	-$7.39M	–	3867
2023 Q2	$7.39M	Buy	13,700 +1,200	+10%	+$607K	﹤0.01%	1154
2023 Q1	$6.22M	Sell	12,500 -800	-6%	-$392K	﹤0.01%	1138
2022 Q4	$6.96M	Hold	13,300	–	–	﹤0.01%	1141
2022 Q3	$7.77M	Sell	13,300 -70,600	-84%	-$36.7M	﹤0.01%	1120
2022 Q2	$49M	Buy	83,900 +70,600	+531%	+$35.8M	0.02%	412
2022 Q1	$7.67M	Buy	+13,300	New	+$6.98M	﹤0.01%	1267
2021 Q2	–	Sell	-50,000	Closed	-$18.1M	–	3918
2021 Q1	$18.1M	Buy	+50,000	New	+$17.4M	0.01%	731
2020 Q1	–	Sell	-88,000	Closed	-$25.9M	–	4196
2019 Q4	$25.9M	Buy	+88,000	New	+$26.2M	0.02%	610
2019 Q3	–	Sell	-8,700	Closed	-$2.3M	–	4751
2019 Q2	$2.3M	Buy	+8,700	New	+$2.17M	﹤0.01%	1605
2016 Q4	–	Sell	-8,100	Closed	-$1.24M	–	4062
2016 Q3	$1.24M	Buy	+8,100	New	+$1.31M	﹤0.01%	1727
2014 Q3	–	Sell	-20	Closed	-$2K	–	4069
2014 Q2	$2K	Buy	+20	New	+$2.29K	﹤0.01%	4479

Other funds holding COST

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Bank of Montreal's COST Position: Q2 2026 in Review

Bank of Montreal increased its Costco (COST) stake by 4.7% in Q2 2026, buying an estimated $64.6M and bringing the position to 1,434,743 shares worth $1.34B. The position accounts for 0.44% of the portfolio, ranked #47.

Bank of Montreal first reported a position in COST in Q2 2013 and has held it in 53 quarters since. The position peaked at $1.74B in Q3 2025. 4,259 funds tracked by Wall St. Rank hold COST as of Q2 2026.

Bank of Montreal held 1,434,743 shares of Costco worth $1.34B as of Q2 2026.
Bank of Montreal bought 64,815 Costco shares in Q2 2026, an estimated $64.6M.
Costco made up 0.44% of Bank of Montreal's portfolio in Q2 2026, its #47 holding.
Bank of Montreal first reported a position in Costco in Q2 2013 and has held it in 53 quarters since.
Bank of Montreal's Costco position peaked at $1.74B in Q3 2025.
4,259 funds tracked by Wall St. Rank held Costco as of Q2 2026.

Based on Bank of Montreal's 13F filing for Q2 2026, filed 12 Aug 2026.