Walleye Capital
MASI

Walleye Capital’s Masimo MASI Stock Holding History

Walleye Capital’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
-42,049
Closed -$5.47M – 4726
2025
Q4 		$5.47M Sell
42,049
-47,314
-53% -$6.77M 0.02% 1086
2025
Q3 		$13.2M Buy
89,363
+46,131
+107% +$6.98M 0.05% 414
2025
Q2 		$7.27M Sell
43,232
-33,138
-43% -$5.29M 0.03% 663
2025
Q1 		$12.7M Buy
76,370
+21,432
+39% +$3.72M 0.06% 341
2024
Q4 		$9.08M Buy
54,938
+10,063
+22% +$1.59M 0.02% 690
2024
Q3 		$5.98M Buy
44,875
+44,133
+5,948% +$5.12M 0.01% 1042
2024
Q2 		$93.4K Buy
742
+553
+293% +$72.8K ﹤0.01% 4749
2024
Q1 		$27.8K Buy
+189
New +$24.4K ﹤0.01% 4836
2022
Q4 		– Sell
-9,013
Closed -$1.27M – 3447
2022
Q3 		$1.27M Buy
9,013
+4,517
+100% +$660K 0.02% 808
2022
Q2 		$587K Sell
4,496
-14,469
-76% -$1.94M 0.02% 937
2022
Q1 		$2.76M Buy
18,965
+17,885
+1,656% +$3.43M 0.07% 279
2021
Q4 		$316K Buy
+1,080
New +$308K 0.01% 1230
2021
Q3 		– Sell
-920
Closed -$223 – 1724
2021
Q2 		$223 Buy
+920
New +$210K 0.01% 1034
2019
Q2 		– Sell
-689
Closed -$94.5K – 1909
2019
Q1 		$95K Buy
+689
New +$86.5K 0.02% 1049

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

Walleye Capital's MASI Position: Q1 2026 in Review

Walleye Capital sold out of Masimo (MASI) in Q1 2026, closing a stake of 42,049 shares — an estimated $5.47M sold.

Walleye Capital first reported a position in MASI in Q1 2019 and held it in 14 quarters. The position peaked at $13.2M in Q3 2025. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Walleye Capital reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • Walleye Capital sold 42,049 Masimo shares in Q1 2026, an estimated $5.47M.
  • Walleye Capital first reported a position in Masimo in Q1 2019 and held it in 14 quarters.
  • Walleye Capital's Masimo position peaked at $13.2M in Q3 2025.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Walleye Capital's 13F filing for Q1 2026, filed 11 May 2026.