Walleye Trading
MASI

Walleye Trading’s Masimo MASI Stock Holding History

Walleye Trading’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 		$4.94M Buy
+27,800
New +$4.36M 0.01% 1148
2024
Q2 		– Sell
-300
Closed -$44.1K – 4656
2024
Q1 		$44.1K Sell
300
-4,000
-93% -$516K ﹤0.01% 4058
2023
Q4 		$504K Sell
4,300
-3,900
-48% -$364K ﹤0.01% 3058
2023
Q3 		$719K Buy
+8,200
New +$954K ﹤0.01% 2635
2021
Q4 		– Sell
-500
Closed -$135K – 5641
2021
Q3 		$135K Sell
500
-400
-44% -$108K ﹤0.01% 4191
2021
Q2 		$218K Buy
+900
New +$205K ﹤0.01% 3827
2021
Q1 		– Sell
-300
Closed -$81K – 5086
2020
Q4 		$81K Sell
300
-500
-63% -$125K ﹤0.01% 4020
2020
Q3 		$189K Buy
800
+700
+700% +$157K ﹤0.01% 3029
2020
Q2 		$23K Buy
+100
New +$21.9K ﹤0.01% 3965
2020
Q1 		– Sell
-700
Closed -$111K – 4317
2019
Q4 		$111K Buy
+700
New +$105K ﹤0.01% 3508
2019
Q3 		– Sell
-600
Closed -$89K – 4254
2019
Q2 		$89K Sell
600
-10,500
-95% -$1.44M ﹤0.01% 3352
2019
Q1 		$1.53M Buy
11,100
+4,400
+66% +$552K 0.01% 1290
2018
Q4 		$719K Buy
+6,700
New +$747K 0.01% 2092

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 Trading's MASI Position: Q1 2026 in Review

Walleye Trading opened a new position in Masimo (MASI) in Q1 2026: 1,100 shares worth $196K. The stake represents ﹤0.01% of the portfolio and ranks #3135 among its holdings. This is a return to the name: Walleye Trading previously reported a position in MASI as recently as Q4 2023.

Walleye Trading first reported a position in MASI in Q2 2015 and has held it in 16 quarters since. The position peaked at $753K in Q4 2023. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Walleye Trading held 1,100 shares of Masimo worth $196K as of Q1 2026.
  • Masimo was a new Walleye Trading position in Q1 2026.
  • Masimo made up ﹤0.01% of Walleye Trading's portfolio in Q1 2026, its #3135 holding.
  • Walleye Trading first reported a position in Masimo in Q2 2015 and has held it in 16 quarters since.
  • Walleye Trading's Masimo position peaked at $753K in Q4 2023.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

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