Position in MASI
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$25,592,647
+$23,480,213 QoQ
Shares Held
143,884
+785.9% QoQ
Ownership
0.275%
of shares outstanding
% of Portfolio
0.15%
of 13F equity value
Holder Rank
#65
of 445 holders
Holding Since
Mar 2021
10 quarters on record
Voting authority
Sole 50.ToString("F0")%
Shared 50.ToString("F0")%
None 0.ToString("F0")%
Common Shares in MASI Over Time
Shares Held
Position Value (USD)
Derivatives in MASI
reported options exposure · as of Mar 31, 2026CallValue
$36,196,545
CallShares
203,500
PutValue
$0
PutShares
0
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Medical Devices
Healthcare · as of Mar 31, 2026TUDOR INVESTMENT CORP ET AL holds $327,149,749 across 40 Medical Devices names. MASI ranks #4 (7.8% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | PEN |
Penumbra Inc
|
411,118 | $134,998,817 | |
| 2 | BSX |
Boston Scientific Corp
|
632,552 | $39,692,638 | |
| 3 | ABT |
Abbott Laboratories
|
326,258 | $33,496,908 | |
| 4 | MASI |
Masimo Corp
This page
|
143,884 | $25,592,647 | |
| 5 | STE |
STERIS plc
|
55,788 | $12,336,400 | |
| 6 | ESTA |
Establishment Labs Holdings Inc.
|
171,430 | $9,733,795 | |
| 7 | INSP |
Inspire Medical Systems, Inc.
|
167,218 | $8,625,104 | |
| 8 | IRMD |
Iradimed Corp
|
71,836 | $6,914,933 |
All Filings in MASI
Export CSV
11 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $25,592,647 | 143,884 | Shares | Defined | 2026-05-15 | |
| 2026-03-31 | $36,196,545 | 203,500 | Call | Defined | 2026-05-15 | |
| 2025-12-31 | $2,112,434 | 16,242 | Shares | Defined | 2026-02-17 | |
| 2025-09-30 | $4,668,629 | 31,641 | Shares | Defined | 2025-11-14 | |
| 2024-09-30 | $261,993 | 1,965 | Shares | Defined | 2024-11-14 | |
| 2024-06-30 | $2,057,229 | 16,335 | Shares | Defined | 2024-08-14 | |
| 2022-09-30 | $225,856 | 1,600 | Call | Defined | 2022-11-14 | |
| 2022-06-30 | $199,794 | 1,529 | Shares | Defined | 2022-08-15 | |
| 2022-03-31 | $1,946,306 | 13,373 | Shares | Defined | 2022-05-16 | |
| 2021-09-30 | $297,781 | 1,100 | Call | Defined | 2021-11-17 | |
| 2021-03-31 | $2,746,274 | 11,958 | Shares | Defined | 2021-05-17 | |
| No filing history on record for this holder in this stock. | ||||||