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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
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 $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Bank of America
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
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Mattson Financial Services's COST Position: Q1 2026 in Review

Mattson Financial Services reduced its Costco (COST) stake by 13% in Q1 2026, selling an estimated $302K and leaving 2,043 shares worth $2.04M. The position accounts for 0.49% of the portfolio, ranked #67.

Mattson Financial Services first reported a position in COST in Q2 2024 and has held it in 8 quarters since. The position peaked at $2.25M in Q2 2024. 4,239 funds tracked by Wall St. Rank hold COST as of Q1 2026.

  • Mattson Financial Services held 2,043 shares of Costco worth $2.04M as of Q1 2026.
  • Mattson Financial Services sold 310 Costco shares in Q1 2026, an estimated $302K.
  • Costco made up 0.49% of Mattson Financial Services's portfolio in Q1 2026, its #67 holding.
  • Mattson Financial Services first reported a position in Costco in Q2 2024 and has held it in 8 quarters since.
  • Mattson Financial Services's Costco position peaked at $2.25M in Q2 2024.
  • 4,239 funds tracked by Wall St. Rank held Costco as of Q1 2026.

Based on Mattson Financial Services's 13F filing for Q1 2026, filed 11 May 2026.