GKIM
MASI

GW&K Investment Management’s Masimo MASI Stock Holding History

GW&K 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 		$21.8M Buy
122,781
+3,419
+3% +$537K 0.19% 186
2025
Q4 		$15.5M Sell
119,362
-4,685
-4% -$671K 0.13% 229
2025
Q3 		$18.3M Buy
124,047
+123,912
+91,787% +$18.8M 0.16% 208
2025
Q2 		$23K Hold
135
– – ﹤0.01% 684
2025
Q1 		$22K Buy
+135
New +$23.4K ﹤0.01% 636

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

GW&K Investment Management's MASI Position: Q1 2026 in Review

GW&K Investment Management increased its Masimo (MASI) stake by 2.9% in Q1 2026, buying an estimated $537K and bringing the position to 122,781 shares worth $21.8M. The position accounts for 0.19% of the portfolio, ranked #186.

GW&K Investment Management first reported a position in MASI in Q1 2025 and has held it in 5 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • GW&K Investment Management held 122,781 shares of Masimo worth $21.8M as of Q1 2026.
  • GW&K Investment Management bought 3,419 Masimo shares in Q1 2026, an estimated $537K.
  • Masimo made up 0.19% of GW&K Investment Management's portfolio in Q1 2026, its #186 holding.
  • GW&K Investment Management first reported a position in Masimo in Q1 2025 and has held it in 5 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on GW&K Investment Management's 13F filing for Q1 2026, filed 13 May 2026.