Position in MASI
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$137,135,279
+$120,042,829 QoQ
Shares Held
770,986
+468.1% QoQ
Ownership
1.47%
of shares outstanding
% of Portfolio
0.29%
of 13F equity value
Holder Rank
#14
of 445 holders
Holding Since
Mar 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
$15,136,737
CallShares
85,100
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, 2026Balyasny Asset Management L.P. holds $878,026,211 across 43 Medical Devices names. MASI ranks #2 (15.6% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | PEN |
Penumbra Inc
|
762,096 | $250,249,463 | |
| 2 | MASI |
Masimo Corp
This page
|
770,986 | $137,135,279 | |
| 3 | ABT |
Abbott Laboratories
|
844,451 | $86,699,784 | |
| 4 | BSX |
Boston Scientific Corp
|
1,356,133 | $85,097,345 | |
| 5 | BRKR |
Bruker Corp
|
1,159,040 | $41,864,524 | |
| 6 | ZBH |
Zimmer Biomet Holdings, Inc.
|
424,578 | $38,390,342 | |
| 7 | AXGN |
Axogen, Inc.
|
1,087,066 | $36,014,495 | |
| 8 | DXCM |
Dexcom Inc
|
566,312 | $35,564,393 |
All Filings in MASI
Export CSV
18 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $15,136,737 | 85,100 | Call | Sole | 2026-05-15 | |
| 2026-03-31 | $137,135,279 | 770,986 | Shares | Sole | 2026-05-15 | |
| 2024-06-30 | $17,092,450 | 135,719 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $37,521,349 | 255,508 | Shares | Sole | 2024-05-13 | |
| 2023-12-31 | $35,460,127 | 302,535 | Shares | Sole | 2024-02-14 | |
| 2023-12-31 | $12,588,354 | 107,400 | Call | Sole | 2024-02-14 | |
| 2023-09-30 | $31,915,520 | 364,000 | Call | Sole | 2023-11-14 | |
| 2023-09-30 | $21,957,527 | 250,428 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $10,695,750 | 65,000 | Call | Sole | 2023-08-14 | |
| 2023-06-30 | $9,345,452 | 56,794 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $8,974,549 | 48,632 | Shares | Other | 2023-05-15 | |
| 2023-03-31 | $7,160,152 | 38,800 | Call | Sole | 2023-05-15 | |
| 2022-12-31 | $16,916,009 | 114,336 | Shares | Other | 2023-02-14 | |
| 2022-09-30 | $2,329,845 | 16,505 | Shares | Other | 2022-11-15 | |
| 2022-03-31 | $8,428,803 | 57,914 | Shares | Sole | 2022-05-16 | |
| 2020-12-31 | $3,004,782 | 11,196 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $8,463,223 | 35,852 | Shares | Sole | 2020-11-16 | |
| 2020-03-31 | $7,805,324 | 44,068 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||