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 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

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return

DAM

Diamant Asset Management Ridgefield, Connecticut $147M AUM 25.76% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Bank of Montreal's COST Position: Q1 2026 in Review

Bank of Montreal reduced its Costco (COST) stake by 23% in Q1 2026, selling an estimated $409M and leaving 1,369,928 shares worth $1.37B. The position accounts for 0.51% of the portfolio, ranked #41.

Bank of Montreal first reported a position in COST in Q2 2013 and has held it in 52 quarters since. The position peaked at $1.74B in Q3 2025. 4,251 funds tracked by Wall St. Rank hold COST as of Q1 2026.

Bank of Montreal held 1,369,928 shares of Costco worth $1.37B as of Q1 2026.
Bank of Montreal sold 419,835 Costco shares in Q1 2026, an estimated $409M.
Costco made up 0.51% of Bank of Montreal's portfolio in Q1 2026, its #41 holding.
Bank of Montreal first reported a position in Costco in Q2 2013 and has held it in 52 quarters since.
Bank of Montreal's Costco position peaked at $1.74B in Q3 2025.
4,251 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on Bank of Montreal's 13F filing for Q1 2026, filed 13 May 2026.