CSS LLC’s Mattel MAT Stock Holding History

CSS LLC’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
2025 Q2	–	Sell	-10,000	Closed	-$194K	–	1075
2025 Q1	$194K	Buy	+10,000	New	+$198K	0.01%	718

Other funds holding MAT

EIG

EdgePoint Investment Group Toronto, Ontario, Canada $12.5B AUM 31.7% 1-Year Est. Return

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

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

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 Austin, Texas $481B AUM 30.42% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

LSV Asset Management Chicago, Illinois $46.4B AUM 27.74% 1-Year Est. Return

CSS LLC's MAT Position: Q1 2026 in Review

CSS LLC reduced its Mattel (MAT) stake by 19% in Q1 2026, selling an estimated $253K and leaving 58,172 shares worth $845K. The position accounts for 0.04% of the portfolio, ranked #385.

CSS LLC first reported a position in MAT in Q1 2025 and has held it in 5 quarters since. The position peaked at $1.43M in Q4 2025. 427 funds tracked by Wall St. Rank hold MAT as of Q1 2026.

CSS LLC held 58,172 shares of Mattel worth $845K as of Q1 2026.
CSS LLC sold 13,860 Mattel shares in Q1 2026, an estimated $253K.
Mattel made up 0.04% of CSS LLC's portfolio in Q1 2026, its #385 holding.
CSS LLC first reported a position in Mattel in Q1 2025 and has held it in 5 quarters since.
CSS LLC's Mattel position peaked at $1.43M in Q4 2025.
427 funds tracked by Wall St. Rank held Mattel as of Q1 2026.

Based on CSS LLC's 13F filing for Q1 2026, filed 15 May 2026.