Position in MASI
as of Mar 31, 2026
· filed May 11, 2026
Position Value
$195,657
+$195,657 QoQ
Shares Held
1,100
Ownership
0.002%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#341
of 445 holders
Holding Since
Jun 2020
13 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.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
$64,495,662
CallShares
362,600
PutValue
$4,944,786
PutShares
27,800
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, 2026Walleye Trading LLC holds $20,119,275 across 13 Medical Devices names. MASI ranks #6 (1.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | BSX |
Boston Scientific Corp
|
219,385 | $13,766,408 | |
| 2 | DXCM |
Dexcom Inc
|
68,250 | $4,286,100 | |
| 3 | GEHC |
GE HealthCare Technologies Inc.
|
11,712 | $833,660 | |
| 4 | EW |
Edwards Lifesciences Corp
|
5,124 | $410,329 | |
| 5 | PEN |
Penumbra Inc
|
600 | $197,022 | |
| 6 | MASI |
Masimo Corp
This page
|
1,100 | $195,657 | |
| 7 | GMED |
Globus Medical Inc
|
1,669 | $143,801 | |
| 8 | ATEC |
Alphatec Holdings, Inc.
|
10,384 | $112,977 |
All Filings in MASI
Export CSV
27 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $64,495,662 | 362,600 | Call | Sole | 2026-05-11 | |
| 2026-03-31 | $195,657 | 1,100 | Shares | Sole | 2026-05-11 | |
| 2026-03-31 | $4,944,786 | 27,800 | Put | Sole | 2026-05-11 | |
| 2024-03-31 | $264,330 | 1,800 | Call | Sole | 2024-05-15 | |
| 2024-03-31 | $44,055 | 300 | Put | Sole | 2024-05-15 | |
| 2023-12-31 | $504,003 | 4,300 | Put | Sole | 2024-02-14 | |
| 2023-12-31 | $753,425 | 6,428 | Shares | Sole | 2024-02-14 | |
| 2023-12-31 | $480,561 | 4,100 | Call | Sole | 2024-02-14 | |
| 2023-09-30 | $718,976 | 8,200 | Put | Sole | 2023-11-21 | |
| 2023-09-30 | $166,592 | 1,900 | Call | Sole | 2023-11-21 | |
| 2023-09-30 | $156,596 | 1,786 | Shares | Sole | 2023-11-21 | |
| 2022-12-31 | $163,780 | 1,107 | Shares | Sole | 2023-02-14 | |
| 2022-12-31 | $384,670 | 2,600 | Call | Sole | 2023-02-14 | |
| 2022-09-30 | $367,016 | 2,600 | Call | Sole | 2022-11-14 | |
| 2022-09-30 | $83,284 | 590 | Shares | Sole | 2022-11-14 | |
| 2021-12-31 | $393,496 | 1,344 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $299,134 | 1,105 | Shares | Sole | 2021-11-15 | |
| 2021-09-30 | $135,355 | 500 | Put | Sole | 2021-11-15 | |
| 2021-06-30 | $153,955 | 635 | Shares | Sole | 2021-08-16 | |
| 2021-06-30 | $218,205 | 900 | Put | Sole | 2021-08-16 | |
| 2021-03-31 | $206,694 | 900 | Call | Sole | 2021-05-17 | |
| 2020-12-31 | $80,514 | 300 | Put | Sole | 2021-02-16 | |
| 2020-12-31 | $295,218 | 1,100 | Call | Sole | 2021-02-16 | |
| 2020-09-30 | $944,240 | 4,000 | Call | Sole | 2020-11-16 | |
| 2020-09-30 | $188,848 | 800 | Put | Sole | 2020-11-16 | |
| 2020-06-30 | $22,799 | 100 | Put | Sole | 2020-08-14 | |
| 2020-06-30 | $683,970 | 3,000 | Call | Sole | 2020-08-14 | |
| No filing history on record for this holder in this stock. | ||||||