Simplex Trading
MASI

Simplex Trading’s Masimo MASI Stock Holding History

Simplex 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 		$8.25M Buy
+46,400
New +$7.28M 0.01% 796
2025
Q4 		– Sell
-1,100
Closed -$162K – 9417
2025
Q3 		$162K Sell
1,100
-300
-21% -$45.4K ﹤0.01% 5187
2025
Q2 		$235K Sell
1,400
-1,300
-48% -$208K ﹤0.01% 4342
2025
Q1 		$449K Buy
2,700
+1,800
+200% +$312K ﹤0.01% 3498
2024
Q4 		$148K Sell
900
-10,600
-92% -$1.67M ﹤0.01% 4801
2024
Q3 		$1.53M Buy
11,500
+8,600
+297% +$998K ﹤0.01% 2514
2024
Q2 		$365K Sell
2,900
-400
-12% -$52.7K ﹤0.01% 4005
2024
Q1 		$484K Sell
3,300
-99,900
-97% -$12.9M ﹤0.01% 3894
2023
Q4 		$12.1M Buy
103,200
+44,700
+76% +$4.17M 0.01% 971
2023
Q3 		$5.13M Buy
58,500
+57,000
+3,800% +$6.63M ﹤0.01% 1338
2023
Q2 		$246K Sell
1,500
-5,200
-78% -$905K ﹤0.01% 4064
2023
Q1 		$1.24M Buy
6,700
+4,600
+219% +$776K ﹤0.01% 2390
2022
Q4 		$310K Buy
2,100
+1,500
+250% +$206K ﹤0.01% 3697
2022
Q3 		$84K Sell
600
-500
-45% -$73K ﹤0.01% 5756
2022
Q2 		$143K Sell
1,100
-8,200
-88% -$1.1M ﹤0.01% 5062
2022
Q1 		$1.35M Buy
9,300
+9,200
+9,200% +$1.77M ﹤0.01% 2531
2021
Q4 		$29K Sell
100
-1,900
-95% -$541K ﹤0.01% 7942
2021
Q3 		$498K Buy
2,000
+100
+5% +$27.1K ﹤0.01% 4118
2021
Q2 		$460K Buy
1,900
+1,881
+9,900% +$429K ﹤0.01% 4295
2021
Q1 		$436K Sell
19
-6
-24% -$1.51K ﹤0.01% 3565
2020
Q4 		$670K Sell
25
-11
-31% -$2.74K ﹤0.01% 3069
2020
Q3 		$849K Sell
36
-46
-56% -$10.3K ﹤0.01% 2414
2020
Q2 		$1.87M Buy
82
+78
+1,950% +$17.1K ﹤0.01% 1567
2020
Q1 		$70K Sell
4
-10
-71% -$1.72K ﹤0.01% 4770
2019
Q4 		$221K Sell
14
-85
-86% -$12.8K ﹤0.01% 3645
2019
Q3 		$1.47M Sell
99
-145
-59% -$22K ﹤0.01% 1593
2019
Q2 		$3.63M Sell
244
-152
-38% -$20.9K 0.01% 879
2019
Q1 		$5.47M Buy
396
+376
+1,880% +$47.2K 0.02% 625
2018
Q4 		$214K Sell
20
-17
-46% -$1.9K ﹤0.01% 3103
2018
Q3 		$460K Buy
37
+31
+517% +$3.44K ﹤0.01% 2721
2018
Q2 		$58K Sell
6
-1
-14% -$95 ﹤0.01% 4892
2018
Q1 		$2K Sell
7
-17
-71% -$1.48K ﹤0.01% 5299
2017
Q4 		$2K Hold
24
– – ﹤0.01% 5213
2017
Q3 		$7K Sell
24
-70
-74% -$6.19K ﹤0.01% 4102
2017
Q2 		$38K Buy
94
+70
+292% +$6.43K ﹤0.01% 2643
2017
Q1 		$6K Buy
+24
New +$1.98K ﹤0.01% 4439
2016
Q2 		– Sell
-20
Closed -$6K – 6182
2016
Q1 		$6K Buy
+20
New +$752 ﹤0.01% 3935
2015
Q4 		– Sell
-20
Closed -$1K – 5813
2015
Q3 		$1K Sell
20
-63
-76% -$2.57K ﹤0.01% 5062
2015
Q2 		$37K Buy
+83
New +$2.97K ﹤0.01% 1932
2015
Q1 		– Sell
-19
Closed -$5K – 5309
2014
Q4 		$5K Buy
+19
New +$469 ﹤0.01% 3094

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

Simplex Trading's MASI Position: Q3 2025 in Review

Simplex Trading sold out of Masimo (MASI) in Q3 2025, closing a stake of 98 shares — an estimated $14.8K sold.

Simplex Trading first reported a position in MASI in Q3 2015 and held it in 28 quarters. The position peaked at $4.44M in Q3 2023. 358 funds tracked by Wall St. Rank hold MASI as of Q3 2025.

  • Simplex Trading reported no remaining Masimo position as of Q3 2025 after selling out during the quarter.
  • Simplex Trading sold 98 Masimo shares in Q3 2025, an estimated $14.8K.
  • Simplex Trading first reported a position in Masimo in Q3 2015 and held it in 28 quarters.
  • Simplex Trading's Masimo position peaked at $4.44M in Q3 2023.
  • 358 funds tracked by Wall St. Rank held Masimo as of Q3 2025.

Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.