Holocene Advisors
MASI

Holocene Advisors’s Masimo MASI Stock Holding History

Holocene Advisors’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
Q3 		– Sell
-1,243,607
Closed -$209M – 849
2025
Q2 		$209M Sell
1,243,607
-89,689
-7% -$14.3M 0.51% 57
2025
Q1 		$222M Buy
1,333,296
+497,636
+60% +$86.3M 0.65% 44
2024
Q4 		$138M Sell
835,660
-39,499
-5% -$6.24M 0.44% 62
2024
Q3 		$117M Sell
875,159
-162,291
-16% -$18.8M 0.47% 63
2024
Q2 		$131M Buy
1,037,450
+259,036
+33% +$34.1M 0.55% 58
2024
Q1 		$114M Buy
+778,414
New +$101M 0.42% 75
2023
Q2 		– Sell
-2,150
Closed -$397K – 800
2023
Q1 		$397K Sell
2,150
-3,875
-64% -$654K ﹤0.01% 663
2022
Q4 		$891K Sell
6,025
-10,005
-62% -$1.38M 0.01% 571
2022
Q3 		$2.26M Sell
16,030
-27,704
-63% -$4.05M 0.01% 390
2022
Q2 		$5.71M Buy
43,734
+7,953
+22% +$1.06M 0.03% 310
2022
Q1 		$5.21M Buy
+35,781
New +$6.87M 0.03% 284
2021
Q4 		– Sell
-9,668
Closed -$2.62M – 931
2021
Q3 		$2.62M Sell
9,668
-14,240
-60% -$3.86M 0.01% 481
2021
Q2 		$5.8M Buy
23,908
+14,891
+165% +$3.4M 0.03% 322
2021
Q1 		$2.07M Buy
+9,017
New +$2.27M 0.01% 579
2018
Q4 		– Sell
-2,140
Closed -$267K – 751
2018
Q3 		$267K Buy
+2,140
New +$237K ﹤0.01% 662

Other funds holding MASI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
PCM
Politan Capital Management New York $255M AUM 62.37% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Westfield Capital Management
Westfield Capital Management Boston, Massachusetts $30.6B AUM 61.81% 1-Year Est. Return
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $38.9B AUM 28.51% 1-Year Est. Return

Holocene Advisors's MASI Position: Q3 2025 in Review

Holocene Advisors sold out of Masimo (MASI) in Q3 2025, closing a stake of 1,243,607 shares — an estimated $209M sold.

Holocene Advisors first reported a position in MASI in Q3 2018 and held it in 15 quarters. The position peaked at $222M in Q1 2025. 358 funds tracked by Wall St. Rank hold MASI as of Q3 2025.

  • Holocene Advisors reported no remaining Masimo position as of Q3 2025 after selling out during the quarter.
  • Holocene Advisors sold 1,243,607 Masimo shares in Q3 2025, an estimated $209M.
  • Holocene Advisors first reported a position in Masimo in Q3 2018 and held it in 15 quarters.
  • Holocene Advisors's Masimo position peaked at $222M in Q1 2025.
  • 358 funds tracked by Wall St. Rank held Masimo as of Q3 2025.

Based on Holocene Advisors's 13F filing for Q3 2025, filed 14 Nov 2025.