Which funds own MASI
Masimo Corp in the Q2 2026 filings. None of the 91 current managers lists it among its largest positions this quarter. What is here is what they held before selling out.
- Managers holding
- 0
- at least, of 91 current
- Combined value
- $0
- as reported
- Opened
- 0
- new this quarter
- Added to
- 0
- already held
- Trimmed or sold out
- 32
- 32 sold out entirely
Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.
Sold out of this quarter
Valued at what the position was worth in the previous filing, because by this one it is gone.
- MFS Investment Management · Long-only$417m held before
- Fidelity (FMR LLC) · Long-only$258m held before
- Millennium Management LLC · Multi-strategy$227m held before
- Balyasny Asset Management LLC · Multi-strategy$152m held before
- AQR Capital Management LLC · Quantitative$147m held before
- Davidson Kempner Capital Management LP · Long/short equity$104m held before
- Neuberger Berman Group LLC · Long-only$72m held before
- Squarepoint Ops LLC · Multi-strategy$69m held before
- Capital Research Global Investors · Long-only$64m held before
- Tudor Investment Corp · Macro$62m held before
- AllianceBernstein LP · Long-only$59m held before
- Citadel Advisors LLC · Multi-strategy$59m held before
- Hudson Bay Capital Management LP · Multi-strategy$59m held before
- Susquehanna International Group LLP · Quantitative$49m held before
- Renaissance Technologies LLC · Quantitative$43m held before
- Arrowstreet Capital LP · Quantitative$31m held before
- Man Group PLC · Quantitative$30m held before
- Woodline Partners LP · Long/short equity$27m held before
- Schonfeld Strategic Advisors LLC · Multi-strategy$21m held before
- Winton Group Ltd · Quantitative$20m held before
- Soros Fund Management LLC · Macro$18m held before
- GAMCO Investors Inc · Activist$16m held before
- Marshall Wace LLP · Quantitative$16m held before
- Voloridge Investment Management LLC · Quantitative$13m held before
- Invesco Ltd · Long-only$12m held before
- Verition Fund Management LLC · Multi-strategy$12m held before
- Caxton Associates LLP · Macro$8.2m held before
- T. Rowe Price Associates Inc · Long-only$8.2m held before
- Quantbot Technologies LP · Quantitative$4.9m held before
- Janus Henderson Group Ltd · Long-only$3.6m held before
- Brevan Howard Capital Management LP · Macro$1.9m held before
- Moore Capital Management LP · Macro$1.8m held before
Ownership through time
At least 22 of the 95 managers whose filings are on file listed MASI in Q1 2026, against 1 in Q2 2013. 12 managers more than in Q4 2025: 8 started positions; 7 listed it again; 2 sold out, by their own filings; 1 no longer listed it among the positions read, which can mean a holding below the listed range, a filing that reported no holdings, or a filing not yet made.
Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.
- Q2 2013: 1
- Q1 2014: 2
- Q2 2014: 4
- Q3 2014: 3
- Q4 2014: 6
- Q1 2015: 3
- Q2 2015: 4
- Q3 2015: 4
- Q4 2015: 4
- Q1 2016: 4
- Q2 2016: 7
- Q3 2016: 8
- Q4 2016: 8
- Q1 2017: 12
- Q2 2017: 9
- Q3 2017: 10
- Q4 2017: 9
- Q1 2018: 12
- Q2 2018: 18
- Q3 2018: 18
- Q4 2018: 20
- Q1 2019: 20
- Q2 2019: 16
- Q3 2019: 14
- Q4 2019: 14
- Q1 2020: 13
- Q2 2020: 14
- Q3 2020: 11
- Q4 2020: 8
- Q1 2021: 11
- Q2 2021: 11
- Q3 2021: 15
- Q4 2021: 17
- Q1 2022: 21
- Q2 2022: 19
- Q3 2022: 16
- Q4 2022: 12
- Q1 2023: 9
- Q2 2023: 10
- Q3 2023: 13
- Q4 2023: 13
- Q1 2024: 11
- Q2 2024: 13
- Q3 2024: 12
- Q4 2024: 13
- Q1 2025: 14
- Q2 2025: 10
- Q3 2025: 8
- Q4 2025: 10
- Q1 2026: 22
- Q2 2013: $2.6m
- Q1 2014: $3.1m
- Q2 2014: $6.3m
- Q3 2014: $5.5m
- Q4 2014: $61m
- Q1 2015: $92m
- Q2 2015: $96m
- Q3 2015: $84m
- Q4 2015: $91m
- Q1 2016: $94m
- Q2 2016: $165m
- Q3 2016: $190m
- Q4 2016: $187m
- Q1 2017: $482m
- Q2 2017: $420m
- Q3 2017: $359m
- Q4 2017: $313m
- Q1 2018: $397m
- Q2 2018: $432m
- Q3 2018: $899m
- Q4 2018: $768m
- Q1 2019: $1.0bn
- Q2 2019: $1.6bn
- Q3 2019: $1.6bn
- Q4 2019: $1.8bn
- Q1 2020: $2.1bn
- Q2 2020: $2.3bn
- Q3 2020: $2.0bn
- Q4 2020: $1.9bn
- Q1 2021: $1.4bn
- Q2 2021: $1.3bn
- Q3 2021: $1.7bn
- Q4 2021: $2.0bn
- Q1 2022: $877m
- Q2 2022: $610m
- Q3 2022: $988m
- Q4 2022: $1.2bn
- Q1 2023: $1.7bn
- Q2 2023: $1.6bn
- Q3 2023: $939m
- Q4 2023: $1.6bn
- Q1 2024: $2.2bn
- Q2 2024: $1.4bn
- Q3 2024: $1.6bn
- Q4 2024: $2.5bn
- Q1 2025: $2.8bn
- Q2 2025: $2.8bn
- Q3 2025: $2.2bn
- Q4 2025: $1.8bn
- Q1 2026: $1.5bn
Between the quarter ends of Q4 2025 and Q1 2026. Each change in shares is valued at the Q1 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.
Started in Q1 2026
Largest increases, by shares
- Balyasny Asset Management LLCnew: 770,986 shares+$137m
- Davidson Kempner Capital Management LPnew: 585,988 shares+$104m
- Hudson Bay Capital Management LPnew: 330,679 shares+$59m
- Woodline Partners LPnew: 153,234 shares+$27m
- Winton Group Ltdnew: 112,783 shares+$20m
Largest decreases, by shares
- MFS Investment Management2,663,875 to 2,342,790 shares-$57m
- Capital Research Global Investors637,894 to 359,058 shares-$50m
- AQR Capital Management LLC1,091,326 to 831,966 shares-$46m
- Squarepoint Ops LLC583,747 to 389,359 shares-$35m
- Schonfeld Strategic Advisors LLC265,036 to 117,297 shares-$26m
Left it
What MASI is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around MASI →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
One email a week on what moved in the market and what it means for the people interviewing into it, with the 13F changes the quarter they are filed.
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