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	–	Sell	-1,500	Closed	-$1.49M	–	3879
2026 Q1	$1.49M	Buy	+1,500	New	+$1.46M	﹤0.01%	1812
2023 Q3	–	Sell	-12,300	Closed	-$6.64M	–	3866
2023 Q2	$6.64M	Buy	12,300 +10,300	+515%	+$5.21M	﹤0.01%	1201
2023 Q1	$995K	Sell	2,000 -10,000	-83%	-$4.9M	﹤0.01%	2049
2022 Q4	$6.28M	Buy	+12,000	New	+$5.86M	﹤0.01%	1186
2020 Q2	–	Sell	-76,500	Closed	-$22.3M	–	4650
2020 Q1	$22.3M	Sell	76,500 -53,400	-41%	-$16.2M	0.03%	462
2019 Q4	$38.2M	Buy	+129,900	New	+$38.6M	0.03%	485
2017 Q3	–	Sell	-10,000	Closed	-$1.6M	–	4177
2017 Q2	$1.6M	Buy	+10,000	New	+$1.72M	﹤0.01%	1749
2015 Q3	–	Sell	-15	Closed	-$2K	–	3998
2015 Q2	$2K	Buy	+15	New	+$2.16K	﹤0.01%	3739
2015 Q1	–	Sell	-10,000	Closed	-$1.42M	–	3998
2014 Q4	$1.42M	Buy	+10,000	New	+$1.36M	﹤0.01%	1546

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.