VPIM
MASI

Vanguard Personalized Indexing Management’s Masimo MASI Stock Holding History

Vanguard Personalized Indexing 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 		$1.82M Buy
10,251
+2,728
+36% +$428K 0.02% 639
2025
Q4 		$978K Buy
7,523
+730
+11% +$105K 0.01% 921
2025
Q3 		$1M Buy
6,793
+352
+5% +$53.3K 0.01% 900
2025
Q2 		$1.08M Buy
6,441
+726
+13% +$116K 0.01% 839
2025
Q1 		$952K Buy
5,715
+23
+0.4% +$3.99K 0.01% 811
2024
Q4 		$941K Buy
5,692
+85
+2% +$13.4K 0.01% 797
2024
Q3 		$748K Buy
5,607
+233
+4% +$27K 0.01% 912
2024
Q2 		$677K Buy
5,374
+166
+3% +$21.9K 0.01% 872
2024
Q1 		$765K Sell
5,208
-1,762
-25% -$228K 0.02% 805
2023
Q4 		$817K Buy
6,970
+4,451
+177% +$415K 0.02% 756
2023
Q3 		$221K Sell
2,519
-8,546
-77% -$995K 0.01% 1265
2023
Q2 		$1.82M Buy
11,065
+90
+0.8% +$15.7K 0.06% 336
2023
Q1 		$2.03M Buy
10,975
+329
+3% +$55.5K 0.07% 285
2022
Q4 		$1.58M Sell
10,646
-307
-3% -$42.2K 0.07% 335
2022
Q3 		$1.55M Sell
10,953
-460
-4% -$67.2K 0.07% 298
2022
Q2 		$1.49M Buy
+11,413
New +$1.53M 0.07% 284
2022
Q1 		– Sell
-1,159
Closed -$339K – 1220
2021
Q4 		$339K Buy
1,159
+248
+27% +$70.6K 0.02% 833
2021
Q3 		$247K Buy
+911
New +$247K 0.02% 856

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

Vanguard Personalized Indexing Management's MASI Position: Q1 2026 in Review

Vanguard Personalized Indexing Management increased its Masimo (MASI) stake by 36% in Q1 2026, buying an estimated $428K and bringing the position to 10,251 shares worth $1.82M. The position accounts for 0.02% of the portfolio, ranked #639.

Vanguard Personalized Indexing Management first reported a position in MASI in Q3 2021 and has held it in 18 quarters since. The position peaked at $2.03M in Q1 2023. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Vanguard Personalized Indexing Management held 10,251 shares of Masimo worth $1.82M as of Q1 2026.
  • Vanguard Personalized Indexing Management bought 2,728 Masimo shares in Q1 2026, an estimated $428K.
  • Masimo made up 0.02% of Vanguard Personalized Indexing Management's portfolio in Q1 2026, its #639 holding.
  • Vanguard Personalized Indexing Management first reported a position in Masimo in Q3 2021 and has held it in 18 quarters since.
  • Vanguard Personalized Indexing Management's Masimo position peaked at $2.03M in Q1 2023.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Vanguard Personalized Indexing Management's 13F filing for Q1 2026, filed 14 May 2026.