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Thompson Siegel & Walmsley’s Mattel MAT Stock Holding History

Thompson Siegel & Walmsley’s Portfolio MAT Stock Details MAT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$9.03M Buy
621,513
+333,713
+116% +$6.08M 0.16% 139
2025
Q4 		$5.71M Sell
287,800
-247,506
-46% -$4.78M 0.1% 204
2025
Q3 		$9.01M Buy
535,306
+131,696
+33% +$2.4M 0.15% 143
2025
Q2 		$7.96M Sell
403,610
-5,144
-1% -$91.6K 0.13% 153
2025
Q1 		$7.94M Sell
408,754
-128,933
-24% -$2.56M 0.13% 143
2024
Q4 		$9.53M Buy
537,687
+65,379
+14% +$1.24M 0.15% 140
2024
Q3 		$9M Buy
+472,308
New +$8.7M 0.13% 145
2017
Q4 		– Sell
-280
Closed -$4K – 861
2017
Q3 		$4K Sell
280
-850
-75% -$15.2K ﹤0.01% 795
2017
Q2 		$24K Buy
+1,130
New +$25.5K ﹤0.01% 628
2015
Q2 		– Sell
-93
Closed -$2K – 713
2015
Q1 		$2K Buy
+93
New +$2.47K ﹤0.01% 681
2014
Q4 		– Sell
-65
Closed -$2K – 708
2014
Q3 		$2K Hold
65
– – ﹤0.01% 672
2014
Q2 		$3K Hold
65
– – ﹤0.01% 637
2014
Q1 		$3K Buy
+65
New +$2.58K ﹤0.01% 638

Other funds holding MAT

EIG
EdgePoint Investment Group Toronto, Ontario, Canada $12.5B AUM 31.7% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
AI
Ariel Investments Chicago, Illinois $8.93B AUM 29.58% 1-Year Est. Return
SAM
Southeastern Asset Management Memphis, Tennessee $2.03B AUM 7.06% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
LSV Asset Management
LSV Asset Management Chicago, Illinois $46.4B AUM 27.74% 1-Year Est. Return

Thompson Siegel & Walmsley's MAT Position: Q1 2026 in Review

Thompson Siegel & Walmsley increased its Mattel (MAT) stake by 116% in Q1 2026, buying an estimated $6.08M and bringing the position to 621,513 shares worth $9.03M. The position accounts for 0.16% of the portfolio, ranked #139.

Thompson Siegel & Walmsley first reported a position in MAT in Q1 2014 and has held it in 13 quarters since. The position peaked at $9.53M in Q4 2024. 425 funds tracked by Wall St. Rank hold MAT as of Q1 2026.

  • Thompson Siegel & Walmsley held 621,513 shares of Mattel worth $9.03M as of Q1 2026.
  • Thompson Siegel & Walmsley bought 333,713 Mattel shares in Q1 2026, an estimated $6.08M.
  • Mattel made up 0.16% of Thompson Siegel & Walmsley's portfolio in Q1 2026, its #139 holding.
  • Thompson Siegel & Walmsley first reported a position in Mattel in Q1 2014 and has held it in 13 quarters since.
  • Thompson Siegel & Walmsley's Mattel position peaked at $9.53M in Q4 2024.
  • 425 funds tracked by Wall St. Rank held Mattel as of Q1 2026.

Based on Thompson Siegel & Walmsley's 13F filing for Q1 2026, filed 11 May 2026.