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S.A. Mason’s Costco COST Stock Holding History

S.A. Mason’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
Q3 		$4.75M Buy
5,219
+1
+0% +$934 1.39% 13
2026
Q2 		$4.88M Buy
5,218
+210
+4% +$209K 1.5% 14
2026
Q1 		$4.99M Buy
5,008
+5
+0.1% +$4.87K 1.87% 13
2025
Q4 		$4.31M Buy
5,003
+92
+2% +$83.4K 1.71% 12
2025
Q3 		$4.55M Sell
4,911
-45
-0.9% -$43.1K 2.01% 10
2025
Q2 		$4.91M Sell
4,956
-98
-2% -$97.4K 2.37% 7
2025
Q1 		$4.78M Sell
5,054
-28
-0.6% -$27.3K 2.53% 8
2024
Q4 		$4.66M Sell
5,082
-34
-0.7% -$31.5K 2.45% 9
2024
Q3 		$4.54M Buy
5,116
+10
+0.2% +$8.68K 2.4% 9
2024
Q2 		$4.34M Sell
5,106
-110
-2% -$85.8K 2.47% 8
2024
Q1 		$3.82M Buy
5,216
+3
+0.1% +$2.14K 2.3% 8
2023
Q4 		$3.44M Sell
5,213
-60
-1% -$35.6K 2.31% 10
2023
Q3 		$2.98M Buy
5,273
+21
+0.4% +$11.6K 2.15% 9
2023
Q2 		$2.61M Hold
5,252
– – 1.89% 9
2023
Q1 		$2.61M Sell
5,252
-24
-0.5% -$11.8K 1.89% 9
2022
Q4 		$2.41M Sell
5,276
-150
-3% -$73.3K 1.81% 8
2022
Q3 		$2.56M Sell
5,426
-238
-4% -$124K 2.03% 8
2022
Q2 		$2.72M Sell
5,664
-40
-0.7% -$20.3K 1.98% 8
2022
Q1 		$3.28M Sell
5,704
-14
-0.2% -$7.35K 2.05% 8
2021
Q4 		$3.25M Sell
5,718
-50
-0.9% -$25.6K 1.95% 9
2021
Q3 		$2.59M Sell
5,768
-10
-0.2% -$4.4K 1.71% 9
2021
Q2 		$2.29M Sell
5,778
-4
-0.1% -$1.51K 1.57% 9
2021
Q1 		$2.04M Buy
5,782
+213
+4% +$74.1K 1.52% 9
2020
Q4 		$2.1M Sell
5,569
-34
-0.6% -$12.7K 1.75% 9
2020
Q3 		$1.99M Buy
5,603
+13
+0.2% +$4.37K 1.89% 10
2020
Q2 		$1.7M Sell
5,590
-314
-5% -$95.5K 1.79% 11
2020
Q1 		$1.68M Sell
5,904
-38
-0.6% -$11.5K 2.04% 7
2019
Q4 		$1.75M Buy
+5,942
New +$1.77M 1.66% 9

Other funds holding COST

Emerald Advisors
Emerald Advisors Bellevue, Washington $781M AUM 4.78% 1-Year Est. Return
Assenagon Asset Management
Assenagon Asset Management Senningerberg, Luxembourg $103B AUM 40.17% 1-Year Est. Return
TD Waterhouse Canada
TD Waterhouse Canada Toronto, Ontario, Canada $38.4B AUM 30.28% 1-Year Est. Return
Ninety One (UK)
Ninety One (UK) London, United Kingdom $45.5B AUM 15.2% 1-Year Est. Return
Sarasin & Partners
Sarasin & Partners London, United Kingdom $8.93B AUM 11.81% 1-Year Est. Return
Congress Asset Management
Congress Asset Management Boston, Massachusetts $15.4B AUM 30.35% 1-Year Est. Return
Fjarde Ap-fonden
Fjarde Ap-fonden Stockholm, Sweden $19.4B AUM 31.69% 1-Year Est. Return
Steginsky Capital
Steginsky Capital Port Washington, New York $610M AUM 12.34% 1-Year Est. Return
MN Services Vermogensbeheer
MN Services Vermogensbeheer The Hague, Netherlands $13.4B AUM 37.34% 1-Year Est. Return
Czech National Bank
Czech National Bank Prague, Czech Republic $18.9B AUM 36.24% 1-Year Est. Return

S.A. Mason's COST Position: Q3 2026 in Review

S.A. Mason increased its Costco (COST) stake by 0.02% in Q3 2026, buying an estimated $934 and bringing the position to 5,219 shares worth $4.75M. The position accounts for 1.39% of the portfolio, ranked #13.

S.A. Mason first reported a position in COST in Q4 2019 and has held it in 28 quarters since. The position peaked at $4.99M in Q1 2026. 879 funds tracked by Wall St. Rank hold COST as of Q3 2026.

  • S.A. Mason held 5,219 shares of Costco worth $4.75M as of Q3 2026.
  • S.A. Mason bought 1 Costco share in Q3 2026, an estimated $934.
  • Costco made up 1.39% of S.A. Mason's portfolio in Q3 2026, its #13 holding.
  • S.A. Mason first reported a position in Costco in Q4 2019 and has held it in 28 quarters since.
  • S.A. Mason's Costco position peaked at $4.99M in Q1 2026.
  • 879 funds tracked by Wall St. Rank held Costco as of Q3 2026.

Based on S.A. Mason's 13F filing for Q3 2026, filed 13 Oct 2026.