William Blair Investment Management
MASI

William Blair Investment Management’s Masimo MASI Stock Holding History

William Blair 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
2021
Q3 		– Sell
-431,775
Closed -$105M – 478
2021
Q2 		$105M Sell
431,775
-6,508
-1% -$1.48M 0.33% 103
2021
Q1 		$101M Sell
438,283
-1,161
-0.3% -$292K 0.33% 102
2020
Q4 		$118M Sell
439,444
-5,744
-1% -$1.43M 0.39% 93
2020
Q3 		$105M Sell
445,188
-7,183
-2% -$1.61M 0.41% 90
2020
Q2 		$103M Sell
452,371
-351,959
-44% -$77.2M 0.42% 93
2020
Q1 		$142M Buy
+804,330
New +$138M 0.69% 45

Other funds holding MASI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
OCBV
Ownership Capital B.V. Amsterdam, Netherlands $178M AUM 4.75% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
CIP
Champlain Investment Partners Burlington, Vermont $7.88B AUM 6.82% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
CS
Credit Suisse Zurich, Switzerland $104B AUM 34.76% 1-Year Est. Return

William Blair Investment Management's MASI Position: Q3 2021 in Review

William Blair Investment Management sold out of Masimo (MASI) in Q3 2021, closing a stake of 431,775 shares — an estimated $105M sold.

William Blair Investment Management first reported a position in MASI in Q1 2020 and held it in 6 quarters. The position peaked at $142M in Q1 2020. 472 funds tracked by Wall St. Rank hold MASI as of Q3 2021.

  • William Blair Investment Management reported no remaining Masimo position as of Q3 2021 after selling out during the quarter.
  • William Blair Investment Management sold 431,775 Masimo shares in Q3 2021, an estimated $105M.
  • William Blair Investment Management first reported a position in Masimo in Q1 2020 and held it in 6 quarters.
  • William Blair Investment Management's Masimo position peaked at $142M in Q1 2020.
  • 472 funds tracked by Wall St. Rank held Masimo as of Q3 2021.

Based on William Blair Investment Management's 13F filing for Q3 2021, filed 10 Nov 2021.