Mason Investment Advisory Services’s Costco COST Stock Holding History

Mason Investment Advisory Services’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	$426K	Hold	427	–	–	0.02%	51
2025 Q4	$368K	Sell	427 -201	-32%	-$182K	0.02%	54
2025 Q3	$581K	Buy	628 +211	+51%	+$202K	0.03%	48
2025 Q2	$413K	Buy	417 +1	+0.2%	+$994	0.02%	51
2025 Q1	$394K	Hold	416	–	–	0.02%	50
2024 Q4	$381K	Sell	416 -4	-1%	-$3.71K	0.02%	54
2024 Q3	$373K	Sell	420 -162	-28%	-$141K	0.02%	51
2024 Q2	$495K	Buy	582 +168	+41%	+$131K	0.03%	41
2024 Q1	$303K	Hold	414	–	–	0.02%	52
2023 Q4	$273K	Buy	414 +25	+6%	+$14.8K	0.02%	54
2023 Q3	$220K	Hold	389	–	–	0.02%	62
2023 Q2	$209K	Buy	+389	New	+$197K	0.02%	63
2022 Q4	–	Sell	-1,004	Closed	-$474K	–	89
2022 Q3	$474K	Buy	1,004 +4	+0.4%	+$2.08K	0.05%	29
2022 Q2	$479K	Hold	1,000	–	–	0.05%	39
2022 Q1	$576K	Hold	1,000	–	–	0.05%	68
2021 Q4	$568K	Hold	1,000	–	–	0.05%	64
2021 Q3	$449K	Hold	1,000	–	–	0.05%	68
2021 Q2	$396K	Hold	1,000	–	–	0.04%	71
2021 Q1	$352K	Hold	1,000	–	–	0.04%	70
2020 Q4	$377K	Hold	1,000	–	–	0.05%	68
2020 Q3	$355K	Hold	1,000	–	–	0.05%	63
2020 Q2	$303K	Hold	1,000	–	–	0.05%	70
2020 Q1	$285K	Hold	1,000	–	–	0.05%	71
2019 Q4	$294K	Hold	1,000	–	–	0.04%	78
2019 Q3	$288K	Hold	1,000	–	–	0.05%	77
2019 Q2	$264K	Hold	1,000	–	–	0.04%	76
2019 Q1	$242K	Buy	+1,000	New	+$219K	0.07%	73

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

Mason Investment Advisory Services's COST Position: Q1 2026 in Review

Mason Investment Advisory Services held its Costco (COST) position steady in Q1 2026 at 427 shares worth $426K. The position accounts for 0.02% of the portfolio, ranked #51.

Mason Investment Advisory Services first reported a position in COST in Q1 2019 and has held it in 27 quarters since. The position peaked at $581K in Q3 2025. 4,239 funds tracked by Wall St. Rank hold COST as of Q1 2026.

Mason Investment Advisory Services held 427 shares of Costco worth $426K as of Q1 2026.
Mason Investment Advisory Services left its Costco share count unchanged in Q1 2026.
Costco made up 0.02% of Mason Investment Advisory Services's portfolio in Q1 2026, its #51 holding.
Mason Investment Advisory Services first reported a position in Costco in Q1 2019 and has held it in 27 quarters since.
Mason Investment Advisory Services's Costco position peaked at $581K in Q3 2025.
4,239 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on Mason Investment Advisory Services's 13F filing for Q1 2026, filed 14 May 2026.