T. Rowe Price Investment Management
MASI

T. Rowe Price Investment Management’s Masimo MASI Stock Holding History

T. Rowe Price 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
2026
Q1 		– Sell
-2,330,158
Closed -$303M – 823
2025
Q4 		$303M Buy
2,330,158
+203,395
+10% +$29.1M 0.19% 128
2025
Q3 		$314M Sell
2,126,763
-373,381
-15% -$56.5M 0.19% 128
2025
Q2 		$421M Buy
2,500,144
+826,892
+49% +$132M 0.27% 106
2025
Q1 		$279M Buy
1,673,252
+10,876
+0.7% +$1.89M 0.18% 138
2024
Q4 		$275M Buy
1,662,376
+135,888
+9% +$21.5M 0.17% 137
2024
Q3 		$204M Buy
1,526,488
+372,137
+32% +$43.2M 0.12% 182
2024
Q2 		$145M Sell
1,154,351
-50,712
-4% -$6.68M 0.09% 220
2024
Q1 		$177M Buy
1,205,063
+43,156
+4% +$5.57M 0.11% 209
2023
Q4 		$136M Buy
1,161,907
+244,381
+27% +$22.8M 0.09% 234
2023
Q3 		$80.4M Buy
917,526
+399,518
+77% +$46.5M 0.06% 287
2023
Q2 		$85.2M Sell
518,008
-18,147
-3% -$3.16M 0.06% 291
2023
Q1 		$98.9M Sell
536,155
-5,605
-1% -$946K 0.07% 263
2022
Q4 		$80.2M Buy
+541,760
New +$74.5M 0.06% 294

Other funds holding MASI

BlackRock
BlackRock New York $6.73T AUM 46.02% 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 $315B AUM 27.84% 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 $3.37T AUM 44.26% 1-Year Est. Return

T. Rowe Price Investment Management's MASI Position: Q1 2026 in Review

T. Rowe Price Investment Management sold out of Masimo (MASI) in Q1 2026, closing a stake of 2,330,158 shares — an estimated $303M sold.

T. Rowe Price Investment Management first reported a position in MASI in Q4 2022 and held it in 13 quarters. The position peaked at $421M in Q2 2025. 446 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • T. Rowe Price Investment Management reported no remaining Masimo position as of Q1 2026 after selling out during the quarter.
  • T. Rowe Price Investment Management sold 2,330,158 Masimo shares in Q1 2026, an estimated $303M.
  • T. Rowe Price Investment Management first reported a position in Masimo in Q4 2022 and held it in 13 quarters.
  • T. Rowe Price Investment Management's Masimo position peaked at $421M in Q2 2025.
  • 446 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on T. Rowe Price Investment Management's 13F filing for Q1 2026, filed 15 May 2026.