Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
8826
Nature's Sunshine
NATR
$214M
| $1K | ﹤0.01% |
46
-100
| -68% | -$2.33K |
2026 Q1
1 quarter
|
|
8827
CALL
KVH Industries
KVHI
$124M
| $991 | ﹤0.01% |
+100
| New | +$957 |
2026 Q2
0 quarters
|
|
8828
WisdomTree India Earnings Fund ETF
EPI
$1.77B
| $983 | ﹤0.01% |
+23
| New | +$981 |
2026 Q2
0 quarters
|
|
8829
CALL
Karyopharm Therapeutics
KPTI
$11.7M
| $977 | ﹤0.01% |
100
-270,600
| -100% | -$2.35M |
2021 Q2
20 quarters
|
|
8830
PUT
FreightCar America
RAIL
$139M
| $974 | ﹤0.01% |
100
-67,100
| -100% | -$565K |
2023 Q4
10 quarters
|
|
8831
Kite Realty
KRG
$4.94B
| $964 | ﹤0.01% |
+34
| New | +$914 |
2026 Q2
0 quarters
|
|
8832
Climb Bio
CLYM
$585M
| $964 | ﹤0.01% |
+74
| New | +$764 |
2026 Q2
0 quarters
|
|
8833
PUT
Mizuho Financial
MFG
$116B
| $958 | ﹤0.01% |
+100
| New | +$898 |
2026 Q2
0 quarters
|
|
8834
TELA Bio
TELA
$43.6M
| $957 | ﹤0.01% |
1,276
+1,133
| +792% | +$927 |
2025 Q4
2 quarters
|
|
8835
YieldMax XYZ Option Income Strategy ETF
XYZY
$19.3M
| $954 | ﹤0.01% |
+37
| New | +$983 |
2026 Q2
0 quarters
|
|
8836
CALL
Yatsen Holding
YSG
$227M
| $951 | ﹤0.01% |
+300
| New | +$907 |
2026 Q2
0 quarters
|
|
8837
CALL
DELISTED
American Express Global Business Travel
GBTG
| $939 | ﹤0.01% |
+100
| New | +$811 |
2026 Q2
0 quarters
|
|
8838
Yorkville Acquisition Corp
MCGA
$245M
| $939 | ﹤0.01% |
+92
| New | +$938 |
2026 Q2
0 quarters
|
|
8839
PUT
Oatly Group
OTLY
$386M
| $935 | ﹤0.01% |
100
-3,300
| -97% | -$34K |
2021 Q2
20 quarters
|
|
8840
Sprott Physical Gold
PHYS
$14.3B
| $935 | ﹤0.01% |
31
-8
| -21% | -$273 |
2026 Q1
1 quarter
|
|
8841
Claritev Corp
CTEV
$398M
| $920 | ﹤0.01% |
+27
| New | +$661 |
2026 Q2
0 quarters
|
|
|
8842
PUT
TELA Bio
TELA
$43.6M
| $900 | ﹤0.01% |
1,200
| – | – |
2025 Q4
2 quarters
|
|
8843
CALL
Douglas Elliman
DOUG
$145M
| $885 | ﹤0.01% |
+500
| New | +$896 |
2026 Q2
0 quarters
|
|
8844
McGraw Hill
MH
$2.8B
| $880 | ﹤0.01% |
+93
| New | +$1.12K |
2026 Q2
0 quarters
|
|
8845
PUT
Cerus
CERS
$470M
| $876 | ﹤0.01% |
+300
| New | +$728 |
2026 Q2
0 quarters
|
|
8846
Franklin FTSE Japan ETF
FLJP
$4.14B
| $874 | ﹤0.01% |
+22
| New | +$854 |
2026 Q2
0 quarters
|
|
8847
PUT
Hornbeck Offshore Services, Inc.
HOS
$2.32B
| $874 | ﹤0.01% |
100
-1,200
| -92% | -$11.5K |
2026 Q1
1 quarter
|
|
8848
CALL
D-Market Electronic Services & Trading
HEPS
$1.2B
| $873 | ﹤0.01% |
300
| – | – |
2026 Q1
1 quarter
|
|
8849
PUT
Vivani Medical
VANI
$100M
| $868 | ﹤0.01% |
+700
| New | +$846 |
2026 Q2
0 quarters
|
|
8850
PUT
Fidelity Solana Fund
FSOL
$134M
| $866 | ﹤0.01% |
+100
| New | +$952 |
2026 Q2
0 quarters
|
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.