CIS
MASI

Custom Index Systems’s Masimo MASI Stock Holding History

Custom Index Systems’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
-1,988
Closed -$293K – 268
2025
Q3 		$293K Buy
1,988
+742
+60% +$112K 0.09% 227
2025
Q2 		$210K Buy
1,246
+16
+1% +$2.56K 0.1% 228
2025
Q1 		$205K Buy
+1,230
New +$213K 0.1% 265

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

Custom Index Systems's MASI Position: Q4 2025 in Review

Custom Index Systems sold out of Masimo (MASI) in Q4 2025, closing a stake of 1,988 shares — an estimated $293K sold.

Custom Index Systems first reported a position in MASI in Q1 2025 and held it in 3 quarters. The position peaked at $293K in Q3 2025. 390 funds tracked by Wall St. Rank hold MASI as of Q4 2025.

  • Custom Index Systems reported no remaining Masimo position as of Q4 2025 after selling out during the quarter.
  • Custom Index Systems sold 1,988 Masimo shares in Q4 2025, an estimated $293K.
  • Custom Index Systems first reported a position in Masimo in Q1 2025 and held it in 3 quarters.
  • Custom Index Systems's Masimo position peaked at $293K in Q3 2025.
  • 390 funds tracked by Wall St. Rank held Masimo as of Q4 2025.

Based on Custom Index Systems's 13F filing for Q4 2025, filed 12 Feb 2026.