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Equibles

CITADEL ADVISORS LLC

Position in MASI — Masimo Corp

CIK 1423053 MIAMI, FL
Back to MASI Full portfolio

Position in MASI

as of Mar 31, 2026 · filed May 15, 2026
Position Value
$50,046,570
+$44,447,228 QoQ
Shares Held
281,366
+553.5% QoQ
Ownership
0.537%
of shares outstanding
% of Portfolio
0.04%
of 13F equity value
Holder Rank
#41
of 445 holders
Holding Since
Mar 2020
25 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, 2026
CallValue
$4,909,212
CallShares
27,600
PutValue
$4,233,306
PutShares
23,800

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, 2026

CITADEL ADVISORS LLC holds $1,870,037,695 across 83 Medical Devices names. MASI ranks #12 (2.7% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 BSX
Boston Scientific Corp
 4,217,314 $264,636,453
2 ABT
Abbott Laboratories
 1,915,846 $196,699,908
3 GMED
Globus Medical Inc
 1,966,114 $169,400,381
4 GKOS
GLAUKOS Corp
 1,446,926 $155,776,052
5 DXCM
Dexcom Inc
 2,091,872 $131,369,561
6 ZBH
Zimmer Biomet Holdings, Inc.
 1,378,665 $124,658,889
7 GEHC
GE HealthCare Technologies Inc.
 1,293,268 $92,054,816
8 MDT
Medtronic plc
 982,741 $85,154,507

All Filings in MASI

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $4,233,306 23,800
2026-03-31 $50,046,570 281,366
2026-03-31 $4,909,212 27,600
2025-12-31 $5,599,342 43,052
2025-12-31 $403,186 3,100
2025-12-31 $663,306 5,100
2025-09-30 $12,947,512 87,750
2025-09-30 $1,593,540 10,800
2025-09-30 $383,630 2,600
2025-06-30 $4,083,876 24,277
2025-06-30 $353,262 2,100
2025-06-30 $1,295,294 7,700
2025-03-31 $849,660 5,100
2025-03-31 $8,243,701 49,482
2025-03-31 $1,282,820 7,700
2024-12-31 $72,901,431 441,025
2024-12-31 $3,041,520 18,400
2024-12-31 $1,818,300 11,000
2024-09-30 $3,973,234 29,800
2024-09-30 $25,272,567 189,549
2024-09-30 $4,586,552 34,400
2024-06-30 $28,650,090 227,490
2024-06-30 $3,173,688 25,200
2024-06-30 $5,176,134 41,100
2024-03-31 $7,871,160 53,600
2024-03-31 $197,544,968 1,345,216
2024-03-31 $4,655,145 31,700
2023-12-31 $89,557,699 764,079
2023-12-31 $8,802,471 75,100
2023-12-31 $27,087,231 231,100
2023-09-30 $49,907,456 569,200
2023-09-30 $5,550,144 63,300
2023-09-30 $22,506,754 256,692
2023-06-30 $1,711,320 10,400
2023-06-30 $6,505,319 39,534
2023-06-30 $4,245,390 25,800
2023-03-31 $28,847,476 156,321
2023-03-31 $6,957,158 37,700
2023-03-31 $2,362,112 12,800
2022-12-31 $3,817,110 25,800
2022-12-31 $4,913,714 33,212
2022-12-31 $3,787,520 25,600
2022-09-30 $26,639,290 188,717
2022-09-30 $1,199,860 8,500
2022-09-30 $536,408 3,800
2022-06-30 $16,329,175 124,965
2022-06-30 $1,293,633 9,900
2022-06-30 $2,391,261 18,300
2022-03-31 $21,315,059 146,455
2022-03-31 $4,293,430 29,500

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