XT
MASI

XTX Topco’s Masimo MASI Stock Holding History

XTX Topco’s Portfolio MASI Stock Details MASI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-12,746
Closed -$1.66M – 4130
2025
Q4 		$1.66M Buy
+12,746
New +$1.83M 0.04% 688
2025
Q3 		– Sell
-10,837
Closed -$1.82M – 2972
2025
Q2 		$1.82M Buy
+10,837
New +$1.73M 0.08% 371
2024
Q4 		– Sell
-17,157
Closed -$2.29M – 2676
2024
Q3 		$2.29M Buy
+17,157
New +$1.99M 0.17% 117
2023
Q4 		– Sell
-3,500
Closed -$307K – 1887
2023
Q3 		$307K Buy
3,500
+2,128
+155% +$248K 0.05% 714
2023
Q2 		$226K Buy
+1,372
New +$239K 0.04% 935
2022
Q1 		– Sell
-2,409
Closed -$705K – 841
2021
Q4 		$705K Buy
+2,409
New +$686K 0.4% 39
2021
Q3 		– Sell
-4,405
Closed -$1.07M – 899
2021
Q2 		$1.07M Buy
4,405
+3,246
+280% +$741K 0.36% 32
2021
Q1 		$266K Buy
+1,159
New +$291K 0.13% 339

Other funds holding MASI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
PCM
Politan Capital Management New York $985M AUM 3.12% 1-Year Est. Return
PCM
Pentwater Capital Management Naples, Florida $19.3B AUM 58.13% 1-Year Est. Return
Barclays
Barclays London, United Kingdom $416B AUM 33.63% 1-Year Est. Return
HI
HBK Investments Dallas, Texas $9.85B AUM 55.6% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

XTX Topco's MASI Position: Q1 2026 in Review

XTX Topco sold out of Masimo (MASI) in Q1 2026, closing a stake of 12,746 shares — an estimated $1.66M sold.

XTX Topco first reported a position in MASI in Q1 2021 and held it in 8 quarters. The position peaked at $2.29M in Q3 2024. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • XTX Topco reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • XTX Topco sold 12,746 Masimo shares in Q1 2026, an estimated $1.66M.
  • XTX Topco first reported a position in Masimo in Q1 2021 and held it in 8 quarters.
  • XTX Topco's Masimo position peaked at $2.29M in Q3 2024.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on XTX Topco's 13F filing for Q1 2026, filed 15 May 2026.