Ken Griffin Options Holdings

Citadel Advisors LLC

  • $550 Billion
  • Q2 2025

Options Holdings Table

Stock Option Type Value Options Held Last Trade Trade History
MERC
Mercer International Inc.

Basic Materials
PUT
$126,000
36.2K
Q2 2025
Added 75.73%
MBIN
Merchants Bancorp

Financial Services
PUT
$542,000
16.4K
Q2 2025
Added 530.77%
MCY
Mercury General Corp

Financial Services
CALL
$1.09 Million
16.2K
Q2 2025
Reduced 66.06%
MCY
Mercury General Corp

Financial Services
PUT
$754,000
11.2K
Q2 2025
Reduced 66.06%
MRCY
Mercury Systems Inc

Industrials
CALL
$2.32 Million
43K
Q2 2025
Reduced 24.23%
MRCY
Mercury Systems Inc

Industrials
PUT
$1.85 Million
34.4K
Q2 2025
Reduced 24.23%
MREO
Mereo Biopharma Group PLC

Healthcare
CALL
$168,000
62.2K
Q2 2025
Added 187.61%
MREO
Mereo Biopharma Group PLC

Healthcare
PUT
$270,000
99.8K
Q2 2025
Added 187.61%
MMSI
Merit Medical Systems Inc

Healthcare
CALL
$972,000
10.4K
Q2 2025
Added 136.36%
MTH
Meritage Homes Corp

Consumer Cyclical
CALL
$1.47 Million
22K
Q2 2025
Added 7.94%
MRSN
Mersana Therapeutics, Inc.

Healthcare
CALL
$10,000
34.3K
Q2 2025
Added 7.69%
MRSN
Mersana Therapeutics, Inc.

Healthcare
PUT
$4,000
14K
Q2 2025
Added 7.69%
MRUS
Merus N.V.

Healthcare
CALL
$3.18 Million
60.4K
Q2 2025
Added 263.92%
MRUS
Merus N.V.

Healthcare
PUT
$1.86 Million
35.3K
Q2 2025
Added 263.92%
MESA
Mesa Air Group Inc

Industrials
CALL
$17,000
19.3K
Q2 2025
Reduced 78.36%
Mesoblast LTD
CALL
$0
141K
Q2 2025
Reduced 23.34%
Mesoblast LTD
PUT
$0
63.4K
Q2 2025
Reduced 23.34%
MTA
Metalla Royalty & Streaming Ltd.

Basic Materials
PUT
$195,000
50.8K
Q2 2025
Added 116.17%
MEOH
Methanex Corp

Basic Materials
CALL
$493,000
14.9K
Q2 2025
Reduced 19.92%
MEOH
Methanex Corp

Basic Materials
PUT
$705,000
21.3K
Q2 2025
Reduced 19.92%
MEI
Methode Electronics Inc

Technology
CALL
$213,000
22.4K
Q2 2025
Added 21.26%
MEI
Methode Electronics Inc

Technology
PUT
$238,000
25.1K
Q2 2025
Added 21.26%
MCB
Metropolitan Bank Holding Corp.

Financial Services
PUT
$259,000
3.7K
Q2 2025
Reduced 53.16%
Metsera Inc
CALL
$0
16.5K
Q2 2025
New holding
Metsera Inc
PUT
$0
18.9K
Q2 2025
New holding
MTD
Mettler Toledo International Inc

Healthcare
PUT
$13.6 Million
11.6K
Q2 2025
Added 300.0%
MFA
Mfa Financial, Inc.

Real Estate
CALL
$705,000
74.6K
Q2 2025
Added 19.83%
MFA
Mfa Financial, Inc.

Real Estate
PUT
$531,000
56.2K
Q2 2025
Added 19.83%
MGPI
Mgp Ingredients Inc

Consumer Defensive
CALL
$1.62 Million
53.9K
Q2 2025
Reduced 21.67%
MGPI
Mgp Ingredients Inc

Consumer Defensive
PUT
$1.55 Million
51.7K
Q2 2025
Reduced 21.67%
Microalgo Inc
CALL
$0
188K
Q2 2025
New holding
Microalgo Inc
PUT
$0
68.4K
Q2 2025
New holding
Microbot Med Inc
CALL
$0
88.6K
Q2 2025
Added 163.64%
Microbot Med Inc
PUT
$0
17.4K
Q2 2025
Added 163.64%
MVST
Microvast Holdings, Inc.

Industrials
CALL
$2.12 Million
583K
Q2 2025
Reduced 4.71%
MVST
Microvast Holdings, Inc.

Industrials
PUT
$1.68 Million
464K
Q2 2025
Reduced 4.71%
MVIS
Microvision, Inc.

Technology
CALL
$110,000
106K
Q2 2025
Reduced 16.11%
MVIS
Microvision, Inc.

Technology
PUT
$288,000
275K
Q2 2025
Reduced 16.11%
MAA
Mid America Apartment Communities Inc.

Real Estate
CALL
$9.16 Million
61.9K
Q2 2025
Reduced 2.33%
MAA
Mid America Apartment Communities Inc.

Real Estate
PUT
$4.34 Million
29.3K
Q2 2025
Reduced 2.33%
AINV
Apollo Investment Corp

Financial Services
CALL
$578,000
52K
Q2 2025
Added 140.54%
AINV
Apollo Investment Corp

Financial Services
PUT
$197,000
17.8K
Q2 2025
Added 140.54%
MIDD
Middleby Corp

Industrials
CALL
$14.5 Million
101K
Q2 2025
Reduced 85.33%
MIDD
Middleby Corp

Industrials
PUT
$1.5 Million
10.4K
Q2 2025
Reduced 85.33%
MSEX
Middlesex Water CO

Utilities
CALL
$595,000
11K
Q2 2025
Reduced 5.98%
MIST
Milestone Pharmaceuticals Inc.

Healthcare
CALL
$56,000
28.9K
Q2 2025
Reduced 60.73%
MIST
Milestone Pharmaceuticals Inc.

Healthcare
PUT
$29,000
15K
Q2 2025
Reduced 60.73%
MLSS
Milestone Scientific Inc.

Healthcare
CALL
$26,000
40.8K
Q2 2025
Added 206.77%
MLKN
Millerknoll, Inc.

Consumer Cyclical
CALL
$969,000
49.9K
Q2 2025
Reduced 28.88%
Ken Griffin

Ken Griffin

Ken Griffin is the founder and CEO of Citadel Advisors, a successful investment firm that uses technology and data-driven approaches to investing. Griffin is known for his expertise in quantitative investing and his innovative approach to investing. He has generated strong returns for his clients over the long term.
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Summary

  • Portfolio
  • No. of Stocks 15,124
  • Current Value $550 Billion
  • Prior Value $509 Billion
  • Filing
  • Period Q2 2025
  • Filing Date August 14, 2025
  • Form Type 13F-HR
  • Activity in Q2 2025
  • New Purchases 1,309 stocks
  • Additional Purchases 2,297 stocks
  • Sold out of 0 stocks
  • Reduced holdings in 2,137 stocks
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