QIM
MASI

Quantitative Investment Management’s Masimo MASI Stock Holding History

Quantitative Investment Management’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
2025
Q4 		– Sell
-12,025
Closed -$1.77M – 489
2025
Q3 		$1.77M Buy
+12,025
New +$1.82M 0.25% 80
2025
Q2 		– Sell
-4,462
Closed -$743K – 413
2025
Q1 		$743K Sell
4,462
-480
-10% -$83.3K 0.07% 213
2024
Q4 		$816K Sell
4,942
-3,698
-43% -$584K 0.06% 216
2024
Q3 		$1.15M Sell
8,640
-2,494
-22% -$289K 0.11% 146
2024
Q2 		$1.4M Buy
+11,134
New +$1.47M 0.15% 127
2022
Q4 		– Sell
-2,916
Closed -$411K – 287
2022
Q3 		$411K Buy
+2,916
New +$426K 0.07% 206
2020
Q3 		– Sell
-8,944
Closed -$2.04M – 532
2020
Q2 		$2.04M Buy
8,944
+1,488
+20% +$327K 0.21% 113
2020
Q1 		$1.32M Sell
7,456
-45,410
-86% -$7.79M 0.14% 175
2019
Q4 		$8.36M Buy
52,866
+43,371
+457% +$6.52M 0.25% 97
2019
Q3 		$1.41M Buy
9,495
+1,765
+23% +$268K 0.08% 295
2019
Q2 		$1.15M Buy
+7,730
New +$1.06M 0.04% 383
2019
Q1 		– Sell
-3,400
Closed -$365K – 765
2018
Q4 		$365K Buy
+3,400
New +$379K 0.02% 424
2018
Q3 		– Sell
-46,300
Closed -$4.52M – 776
2018
Q2 		$4.52M Buy
+46,300
New +$4.4M 0.09% 218

Other funds holding MASI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
PCM
Politan Capital Management New York $985M AUM 3.12% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
NCMU
NAYA Capital Management (UK) London, United Kingdom $1.18B AUM 13.14% 1-Year Est. Return
Westfield Capital Management
Westfield Capital Management Boston, Massachusetts $23.8B AUM 49.45% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return

Quantitative Investment Management's MASI Position: Q4 2025 in Review

Quantitative Investment Management sold out of Masimo (MASI) in Q4 2025, closing a stake of 12,025 shares — an estimated $1.77M sold.

Quantitative Investment Management first reported a position in MASI in Q2 2018 and held it in 13 quarters. The position peaked at $8.36M in Q4 2019. 390 funds tracked by Wall St. Rank hold MASI as of Q4 2025.

  • Quantitative Investment Management reported no remaining Masimo position as of Q4 2025 after selling out during the quarter.
  • Quantitative Investment Management sold 12,025 Masimo shares in Q4 2025, an estimated $1.77M.
  • Quantitative Investment Management first reported a position in Masimo in Q2 2018 and held it in 13 quarters.
  • Quantitative Investment Management's Masimo position peaked at $8.36M in Q4 2019.
  • 390 funds tracked by Wall St. Rank held Masimo as of Q4 2025.

Based on Quantitative Investment Management's 13F filing for Q4 2025, filed 17 Feb 2026.