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 | |
|---|---|---|---|---|---|---|---|
6801
CALL
trivago
TRVG
$272M
| $28.4K | ﹤0.01% |
+5,200
| New | +$18.4K |
2026 Q2
0 quarters
|
|
6802
PUT
CG Oncology
CGON
$5.51B
| $28.4K | ﹤0.01% |
400
| – | – |
2024 Q2
8 quarters
|
|
6803
Suzano
SUZ
$10.6B
| $28.4K | ﹤0.01% |
+3,662
| New | +$31.8K |
2026 Q2
0 quarters
|
|
6804
PUT
So-Young International
SY
$211M
| $28.4K | ﹤0.01% |
19,200
-47,100
| -71% | -$113K |
2025 Q3
3 quarters
|
|
6805
AFC Gamma
AFCG
$68.1M
| $28.4K | ﹤0.01% |
+9,166
| New | +$28.8K |
2026 Q2
0 quarters
|
|
6806
Leverage Shares 2X Long ECHO Daily ETF
ECHX
$13.5M
| $28.4K | ﹤0.01% |
2,613
+2,421
| +1,261% | +$41.9K |
2026 Q1
1 quarter
|
|
6807
PUT
Prestige Consumer Healthcare
PBH
$2.3B
| $28.4K | ﹤0.01% |
600
+400
| +200% | +$20.6K |
2026 Q1
1 quarter
|
|
6808
CALL
Arlo Technologies
ARLO
$1.31B
| $28.3K | ﹤0.01% |
2,100
+1,800
| +600% | +$24.4K |
2018 Q3
31 quarters
|
|
6809
Tango Therapeutics
TNGX
$3.81B
| $28.2K | ﹤0.01% |
902
-154
| -15% | -$3.81K |
2026 Q1
1 quarter
|
|
6810
PUT
Liberty Capital Corp Series C GCI Group Common Stock
GLIBK
$850M
| $28K | ﹤0.01% |
1,300
-3,700
| -74% | -$104K |
2025 Q4
2 quarters
|
|
6811
CALL
Fidelity Hedged Equity ETF
FHEQ
$1B
| $28K | ﹤0.01% |
+900
| New | +$29.1K |
2026 Q2
0 quarters
|
|
6812
Universal Display
OLED
$4.05B
| $28K | ﹤0.01% |
+323
| New | +$29.8K |
2026 Q2
0 quarters
|
|
6813
PUT
Strata Critical Medical Inc
SRTA
$423M
| $27.9K | ﹤0.01% |
5,300
+1,800
| +51% | +$9.47K |
2023 Q4
10 quarters
|
|
6814
CALL
Cardiol Therapeutics
CRDL
$140M
| $27.9K | ﹤0.01% |
26,300
-8,500
| -24% | -$10.8K |
2026 Q1
1 quarter
|
|
6815
Direxion Daily SpaceX Bull 2X ETF
LOFF
$47.9M
| $27.9K | ﹤0.01% |
+1,086
| New | +$29.1K |
2026 Q2
0 quarters
|
|
6816
Entera Bio
ENTX
$502M
| $27.8K | ﹤0.01% |
+15,698
| New | +$19.6K |
2026 Q2
0 quarters
|
|
6817
CALL
Pulse Biosciences
PLSE
$3.78B
| $27.7K | ﹤0.01% |
1,000
-500
| -33% | -$11.8K |
2018 Q2
32 quarters
|
|
6818
PUT
FB Financial Corp
FBK
$2.66B
| $27.7K | ﹤0.01% |
500
| – | – |
2026 Q1
1 quarter
|
|
6819
PUT
Tenax Therapeutics
TENX
$62.5M
| $27.6K | ﹤0.01% |
+1,900
| New | +$24.3K |
2026 Q2
0 quarters
|
|
6820
CALL
MBX Biosciences
MBX
$2.37B
| $27.6K | ﹤0.01% |
500
| – | – |
2025 Q2
4 quarters
|
|
6821
Atmus Filtration Technologies
ATMU
$3.67B
| $27.6K | ﹤0.01% |
541
+448
| +482% | +$24.3K |
2026 Q1
1 quarter
|
|
6822
ChipMOS TECHNOLOGIES
IMOS
$2B
| $27.5K | ﹤0.01% |
+428
| New | +$22.6K |
2026 Q2
0 quarters
|
|
6823
Kimbell Royalty Partners
KRP
$1.69B
| $27.5K | ﹤0.01% |
1,890
-11,989
| -86% | -$179K |
2025 Q4
2 quarters
|
|
6824
CALL
Kurv Technology Titans Select ETF
KQQQ
$129M
| $27.5K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$29.2K |
2025 Q1
5 quarters
|
|
6825
Virtus InfraCap US Preferred Stock ETF
PFFA
$2.28B
| $27.4K | ﹤0.01% |
1,334
-7,726
| -85% | -$165K |
2025 Q4
2 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.