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CITADEL ADVISORS LLC

Position in MKTX — Marketaxess Holdings Inc

CIK 1423053 MIAMI, FL

Position in MKTX

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$54,666,883
+$41,112,292 QoQ
Shares Held
481,689
+486.3% QoQ
Ownership
1.37%
of shares outstanding
% of Portfolio
0.04%
of 13F equity value
Holder Rank
#20
of 393 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in MKTX Over Time

Shares Held

Position Value (USD)

Derivatives in MKTX

reported options exposure · as of Jun 30, 2026
CallValue
$4,199,130
CallShares
37,000
PutValue
$3,382,002
PutShares
29,800

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 Capital Markets

Financial Services · as of Jun 30, 2026

CITADEL ADVISORS LLC holds $2,532,851,593 across 62 Capital Markets names. MKTX ranks #13 (2.2% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in MKTX

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $4,199,130 37,000
2026-06-30 $3,382,002 29,800
2026-06-30 $54,666,883 481,689
2026-03-31 $3,217,110 19,500
2026-03-31 $3,464,580 21,000
2026-03-31 $13,554,591 82,159
2025-12-31 $6,724,375 37,100
2025-12-31 $6,017,500 33,200
2025-12-31 $113,318,950 625,208
2025-09-30 $12,110,375 69,500
2025-09-30 $54,032,485 310,086
2025-09-30 $4,722,175 27,100
2025-06-30 $1,139,034 5,100
2025-06-30 $78,429,413 351,166
2025-06-30 $13,199,394 59,100
2025-03-31 $4,586,620 21,200
2025-03-31 $102,624,540 474,345
2025-03-31 $4,889,510 22,600
2024-12-31 $3,820,076 16,900
2024-12-31 $8,476,500 37,500
2024-12-31 $22,736,910 100,588
2024-09-30 $3,919,860 15,300
2024-09-30 $6,405,000 25,000
2024-09-30 $56,139,825 219,125
2024-06-30 $6,336,748 31,600
2024-06-30 $38,271,752 190,853
2024-06-30 $3,028,003 15,100
2024-03-31 $7,016,000 32,000
2024-03-31 $65,656,166 299,458
2024-03-31 $6,840,600 31,200
2023-12-31 $9,371,200 32,000
2023-12-31 $7,350,535 25,100
2023-12-31 $101,268,408 345,803
2023-09-30 $22,218,773 104,001
2023-09-30 $13,672,960 64,000
2023-09-30 $7,990,136 37,400
2023-06-30 $3,921,300 15,000
2023-06-30 $38,340,118 146,661
2023-06-30 $2,718,768 10,400
2023-03-31 $25,472,979 65,100
2023-03-31 $14,154,132 36,173
2023-03-31 $8,725,767 22,300
2022-12-31 $5,689,356 20,400
2022-12-31 $6,777,027 24,300
2022-12-31 $14,991,452 53,754
2022-09-30 $12,481,689 56,100
2022-09-30 $6,941,688 31,200
2022-09-30 $69,167,913 310,881
2022-06-30 $7,910,709 30,900
2022-06-30 $5,478,614 21,400