Group One Trading
MASI

Group One Trading’s Masimo MASI Stock Holding History

Group One 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 		– Sell
-2,500
Closed -$325K – 8271
2025
Q4 		$325K Buy
+2,500
New +$358K ﹤0.01% 3934
2025
Q1 		– Sell
-100
Closed -$16.5K – 8051
2024
Q4 		$16.5K Sell
100
-10,000
-99% -$1.58M ﹤0.01% 5822
2024
Q3 		$1.35M Buy
10,100
+9,500
+1,583% +$1.1M ﹤0.01% 2061
2024
Q2 		$75.6K Hold
600
– – ﹤0.01% 4186
2024
Q1 		$88.1K Buy
600
+500
+500% +$64.6K ﹤0.01% 4253
2023
Q4 		$11.7K Sell
100
-9,900
-99% -$923K ﹤0.01% 6101
2023
Q3 		$877K Buy
+10,000
New +$1.16M ﹤0.01% 2403
2023
Q2 		– Sell
-100
Closed -$18.5K – 7975
2023
Q1 		$18.5K Buy
+100
New +$16.9K ﹤0.01% 5565
2020
Q2 		– Sell
-9,600
Closed -$1.7M – 6008
2020
Q1 		$1.7M Buy
+9,600
New +$1.65M 0.01% 1154
2018
Q1 		– Sell
-3,700
Closed -$314K – 5104
2017
Q4 		$314K Sell
3,700
-400
-10% -$34.7K ﹤0.01% 2610
2017
Q3 		$355K Buy
4,100
+3,600
+720% +$318K ﹤0.01% 2344
2017
Q2 		$46K Buy
+500
New +$45.9K ﹤0.01% 3546
2013
Q4 		– Sell
-2,000
Closed -$53K – 5400
2013
Q3 		$53K Buy
2,000
+1,700
+567% +$41.9K ﹤0.01% 3496
2013
Q2 		$6K Buy
+300
New +$6.31K ﹤0.01% 4627

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

Group One Trading's MASI Position: Q1 2025 in Review

Group One Trading sold out of Masimo (MASI) in Q1 2025, closing a stake of 75 shares — an estimated $13K sold.

Group One Trading first reported a position in MASI in Q1 2014 and held it in 15 quarters. The position peaked at $6.05M in Q3 2021. 394 funds tracked by Wall St. Rank hold MASI as of Q1 2025.

  • Group One Trading reported no remaining Masimo position as of Q1 2025 after selling out during the quarter.
  • Group One Trading sold 75 Masimo shares in Q1 2025, an estimated $13K.
  • Group One Trading first reported a position in Masimo in Q1 2014 and held it in 15 quarters.
  • Group One Trading's Masimo position peaked at $6.05M in Q3 2021.
  • 394 funds tracked by Wall St. Rank held Masimo as of Q1 2025.

Based on Group One Trading's 13F filing for Q1 2025, filed 14 May 2025.