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 		$196K Buy
+1,100
New +$173K ﹤0.01% 3135
2024
Q1 		– Sell
-6,428
Closed -$830K – 5096
2023
Q4 		$753K Buy
6,428
+4,642
+260% +$433K ﹤0.01% 2725
2023
Q3 		$157K Buy
+1,786
New +$208K ﹤0.01% 3753
2023
Q1 		– Sell
-1,107
Closed -$164K – 5150
2022
Q4 		$164K Buy
1,107
+517
+88% +$71.1K ﹤0.01% 3730
2022
Q3 		$83K Buy
+590
New +$86.2K ﹤0.01% 4112
2022
Q1 		– Sell
-1,344
Closed -$393K – 5665
2021
Q4 		$393K Buy
1,344
+239
+22% +$68.1K ﹤0.01% 3188
2021
Q3 		$299K Buy
1,105
+470
+74% +$127K ﹤0.01% 3455
2021
Q2 		$154K Buy
+635
New +$145K ﹤0.01% 4123
2020
Q1 		– Sell
-589
Closed -$93K – 4316
2019
Q4 		$93K Buy
+589
New +$88.5K ﹤0.01% 3588
2019
Q3 		– Sell
-165
Closed -$25K – 4253
2019
Q2 		$25K Sell
165
-2,291
-93% -$314K ﹤0.01% 3703
2019
Q1 		$340K Buy
2,456
+1,688
+220% +$212K ﹤0.01% 2598
2018
Q4 		$82K Buy
+768
New +$85.6K ﹤0.01% 3978
2016
Q3 		– Sell
-6,976
Closed -$366K – 5176
2016
Q2 		$366K Buy
6,976
+6,776
+3,388% +$319K ﹤0.01% 2482
2016
Q1 		$8K Buy
+200
New +$7.52K ﹤0.01% 4813
2015
Q4 		– Sell
-3,648
Closed -$141K – 5504
2015
Q3 		$141K Buy
3,648
+3,048
+508% +$125K ﹤0.01% 2646
2015
Q2 		$23K Buy
+600
New +$21.5K ﹤0.01% 3932

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.