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Mattson Financial Services’s Costco COST Stock Holding History

Mattson Financial 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
Q2 		$2.1M Buy
2,217
+174
+9% +$173K 0.44% 73
2026
Q1 		$2.04M Sell
2,043
-310
-13% -$302K 0.49% 67
2025
Q4 		$2.03M Buy
2,353
+25
+1% +$22.7K 0.47% 73
2025
Q3 		$2.15M Buy
2,328
+78
+3% +$74.8K 0.52% 70
2025
Q2 		$2.23M Sell
2,250
-33
-1% -$32.8K 0.6% 66
2025
Q1 		$2.16M Buy
2,283
+7
+0.3% +$6.83K 0.65% 60
2024
Q4 		$2.02M Sell
2,276
-355
-13% -$329K 0.64% 52
2024
Q3 		$2.24M Sell
2,631
-16
-0.6% -$13.9K 0.8% 43
2024
Q2 		$2.25M Buy
+2,647
New +$2.07M 0.8% 43

Other funds holding COST

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Morgan Stanley
Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
Norges Bank
Norges Bank Oslo, Norway $1T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Mattson Financial Services's COST Position: Q2 2026 in Review

Mattson Financial Services increased its Costco (COST) stake by 8.5% in Q2 2026, buying an estimated $173K and bringing the position to 2,217 shares worth $2.1M. The position accounts for 0.44% of the portfolio, ranked #73.

Mattson Financial Services first reported a position in COST in Q2 2024 and has held it in 9 quarters since. The position peaked at $2.25M in Q2 2024. 4,254 funds tracked by Wall St. Rank hold COST as of Q2 2026.

  • Mattson Financial Services held 2,217 shares of Costco worth $2.1M as of Q2 2026.
  • Mattson Financial Services bought 174 Costco shares in Q2 2026, an estimated $173K.
  • Costco made up 0.44% of Mattson Financial Services's portfolio in Q2 2026, its #73 holding.
  • Mattson Financial Services first reported a position in Costco in Q2 2024 and has held it in 9 quarters since.
  • Mattson Financial Services's Costco position peaked at $2.25M in Q2 2024.
  • 4,254 funds tracked by Wall St. Rank held Costco as of Q2 2026.

Based on Mattson Financial Services's 13F filing for Q2 2026, filed 4 Aug 2026.