LIM
MASI

Longfellow Investment Management’s Masimo MASI Stock Holding History

Longfellow 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 		$76.3K Buy
+429
New +$67.3K 0.02% 134
2022
Q4 		– Sell
-4
Closed -$1K – 306
2022
Q3 		$1K Hold
4
– – ﹤0.01% 314
2022
Q2 		$1K Buy
4
+2
+100% +$268 ﹤0.01% 343
2022
Q1 		$1K Hold
2
– – ﹤0.01% 377
2021
Q4 		$1K Hold
2
– – ﹤0.01% 379
2021
Q3 		$1K Hold
2
– – ﹤0.01% 405
2021
Q2 		$1K Hold
2
– – ﹤0.01% 422
2021
Q1 		$1K Hold
2
– – ﹤0.01% 480
2020
Q4 		$1K Buy
+2
New +$499 ﹤0.01% 497

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

Longfellow Investment Management's MASI Position: Q1 2026 in Review

Longfellow Investment Management opened a new position in Masimo (MASI) in Q1 2026: 429 shares worth $76.3K. The stake represents 0.02% of the portfolio and ranks #134 among its holdings. This is a return to the name: Longfellow Investment Management previously reported a position in MASI as recently as Q3 2022.

Longfellow Investment Management first reported a position in MASI in Q4 2020 and has held it in 9 quarters since. 445 funds tracked by Wall St. Rank hold MASI as of Q1 2026.

  • Longfellow Investment Management held 429 shares of Masimo worth $76.3K as of Q1 2026.
  • Masimo was a new Longfellow Investment Management position in Q1 2026.
  • Masimo made up 0.02% of Longfellow Investment Management's portfolio in Q1 2026, its #134 holding.
  • Longfellow Investment Management first reported a position in Masimo in Q4 2020 and has held it in 9 quarters since.
  • 445 funds tracked by Wall St. Rank held Masimo as of Q1 2026.

Based on Longfellow Investment Management's 13F filing for Q1 2026, filed 12 May 2026.