Adage Capital Partners’s Costco COST Stock Holding History

Adage Capital Partners’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	$396M	Buy	397,677 +8,100	+2%	+$7.89M	0.61%	20
2025 Q4	$336M	Sell	389,577 -700	-0.2%	-$634K	0.51%	26
2025 Q3	$361M	Buy	390,277 +42,400	+12%	+$40.6M	0.57%	27
2025 Q2	$344M	Sell	347,877 -34,400	-9%	-$34.2M	0.58%	26
2025 Q1	$362M	Sell	382,277 -4,918	-1%	-$4.79M	0.67%	23
2024 Q4	$355M	Buy	387,195 +11,997	+3%	+$11.1M	0.62%	26
2024 Q3	$333M	Buy	375,198 +13,571	+4%	+$11.8M	0.59%	24
2024 Q2	$307M	Buy	361,627 +145,950	+68%	+$114M	0.57%	23
2024 Q1	$158M	Sell	215,677 -101,575	-32%	-$72.5M	0.3%	59
2023 Q4	$209M	Sell	317,252 -36,350	-10%	-$21.5M	0.43%	38
2023 Q3	$200M	Sell	353,602 -11,494	-3%	-$6.34M	0.45%	36
2023 Q2	$197M	Sell	365,096 -47,881	-12%	-$24.2M	0.43%	40
2023 Q1	$205M	Sell	412,977 -7,900	-2%	-$3.87M	0.46%	32
2022 Q4	$192M	Buy	420,877 +77,200	+22%	+$37.7M	0.46%	32
2022 Q3	$162M	Sell	343,677 -117,900	-26%	-$61.3M	0.4%	43
2022 Q2	$221M	Buy	461,577 +43,190	+10%	+$21.9M	0.51%	29
2022 Q1	$241M	Sell	418,387 -52,390	-11%	-$27.5M	0.46%	35
2021 Q4	$267M	Sell	470,777 -3,900	-0.8%	-$2M	0.48%	35
2021 Q3	$213M	Buy	474,677 +98,309	+26%	+$43.2M	0.42%	47
2021 Q2	$149M	Buy	376,368 +178,400	+90%	+$67.5M	0.29%	74
2021 Q1	$69.8M	Sell	197,968 -99,200	-33%	-$34.5M	0.14%	166
2020 Q4	$112M	Sell	297,168 -36,842	-11%	-$13.8M	0.24%	89
2020 Q3	$119M	Buy	334,010 +83,900	+34%	+$28.2M	0.3%	72
2020 Q2	$75.8M	Sell	250,110 -247,010	-50%	-$75.2M	0.19%	124
2020 Q1	$142M	Sell	497,120 -11,358	-2%	-$3.45M	0.42%	49
2019 Q4	$149M	Buy	508,478 +449,819	+767%	+$134M	0.37%	60
2019 Q3	$16.9M	Sell	58,659 -471,675	-89%	-$133M	0.04%	408
2019 Q2	$140M	Buy	530,334 +270,436	+104%	+$67.4M	0.35%	68
2019 Q1	$62.9M	Sell	259,898 -275,846	-51%	-$60.3M	0.16%	164
2018 Q4	$109M	Sell	535,744 -20,212	-4%	-$4.51M	0.3%	88
2018 Q3	$131M	Sell	555,956 -14,800	-3%	-$3.33M	0.29%	93
2018 Q2	$119M	Buy	570,756 +131,656	+30%	+$26M	0.27%	90
2018 Q1	$82.7M	Buy	439,100 +61,000	+16%	+$11.5M	0.19%	145
2017 Q4	$70.4M	Buy	378,100 +156,890	+71%	+$27.1M	0.16%	156
2017 Q3	$36.3M	Sell	221,210 -206,500	-48%	-$32.4M	0.09%	280
2017 Q2	$68.4M	Sell	427,710 -163,361	-28%	-$28.1M	0.17%	168
2017 Q1	$99.1M	Sell	591,071 -18,397	-3%	-$3.08M	0.25%	109
2016 Q4	$97.6M	Sell	609,468 -8,600	-1%	-$1.31M	0.27%	99
2016 Q3	$94.3M	Sell	618,068 -26,200	-4%	-$4.23M	0.26%	102
2016 Q2	$101M	Sell	644,268 -12,000	-2%	-$1.82M	0.28%	100
2016 Q1	$103M	Buy	656,268 +8,259	+1%	+$1.25M	0.28%	104
2015 Q4	$105M	Sell	648,009 -11,400	-2%	-$1.8M	0.27%	107
2015 Q3	$95.3M	Sell	659,409 -8,200	-1%	-$1.17M	0.26%	102
2015 Q2	$90.2M	Sell	667,609 -6,000	-0.9%	-$863K	0.22%	125
2015 Q1	$102M	Buy	673,609 +229,000	+52%	+$33.6M	0.25%	115
2014 Q4	$63M	Sell	444,609 -211,700	-32%	-$28.8M	0.15%	181
2014 Q3	$82.2M	Buy	656,309 +86,132	+15%	+$10.4M	0.2%	134
2014 Q2	$65.7M	Buy	570,177 +39,400	+7%	+$4.52M	0.17%	174
2014 Q1	$59.3M	Sell	530,777 -131,300	-20%	-$15M	0.16%	181
2013 Q4	$78.8M	Buy	662,077 +17,784	+3%	+$2.13M	0.21%	139
2013 Q3	$74.2M	Buy	644,293 +420,484	+188%	+$48.5M	0.21%	139
2013 Q2	$24.7M	Buy	+223,809	New	+$24.5M	0.08%	311

Other funds holding COST

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $2.9T AUM 29.55% 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 $137B AUM 18.02% 1-Year Est. Return

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

Adage Capital Partners's COST Position: Q1 2026 in Review

Adage Capital Partners increased its Costco (COST) stake by 2.1% in Q1 2026, buying an estimated $7.89M and bringing the position to 397,677 shares worth $396M. The position accounts for 0.61% of the portfolio, ranked #20.

Adage Capital Partners first reported a position in COST in Q2 2013 and has held it in 52 quarters since. 4,236 funds tracked by Wall St. Rank hold COST as of Q1 2026.

Adage Capital Partners held 397,677 shares of Costco worth $396M as of Q1 2026.
Adage Capital Partners bought 8,100 Costco shares in Q1 2026, an estimated $7.89M.
Costco made up 0.61% of Adage Capital Partners's portfolio in Q1 2026, its #20 holding.
Adage Capital Partners first reported a position in Costco in Q2 2013 and has held it in 52 quarters since.
4,236 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on Adage Capital Partners's 13F filing for Q1 2026, filed 15 May 2026.