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 | |
|---|---|---|---|---|---|---|---|
7251
PUT
Sonic Automotive
SAH
$1.94B
| $17K | ﹤0.01% |
200
+100
| +100% | +$7.68K |
2026 Q1
1 quarter
|
|
7252
Vertex
VERX
$2.5B
| $16.9K | ﹤0.01% |
1,475
+1,218
| +474% | +$15.2K |
2026 Q1
1 quarter
|
|
7253
Essential Utilities
WTRG
$12.2B
| $16.9K | ﹤0.01% |
442
+333
| +306% | +$12.7K |
2026 Q1
1 quarter
|
|
7254
EVgo
EVGO
$145M
| $16.9K | ﹤0.01% |
+8,829
| New | +$17.8K |
2026 Q2
0 quarters
|
|
7255
Data I/O
DAIO
$25.6M
| $16.9K | ﹤0.01% |
4,279
+1,520
| +55% | +$4.77K |
2025 Q1
5 quarters
|
|
7256
PUT
Industrial Logistics Properties Trust
ILPT
$471M
| $16.9K | ﹤0.01% |
1,900
+800
| +73% | +$6.2K |
2026 Q1
1 quarter
|
|
7257
PUT
Amplitude
AMPL
$2.18B
| $16.8K | ﹤0.01% |
2,200
-400
| -15% | -$2.76K |
2021 Q4
18 quarters
|
|
7258
PUT
Progress Software
PRGS
$1.9B
| $16.8K | ﹤0.01% |
500
-1,800
| -78% | -$53.3K |
2025 Q1
5 quarters
|
|
7259
PUT
Option Care Health
OPCH
$4.68B
| $16.8K | ﹤0.01% |
800
+700
| +700% | +$16.3K |
2023 Q2
12 quarters
|
|
7260
PUT
Cypherpunk Technologies Inc
CYPH
$304M
| $16.8K | ﹤0.01% |
27,400
-62,500
| -70% | -$57.1K |
2025 Q4
2 quarters
|
|
7261
CALL
Organogenesis Holdings
ORGO
$128M
| $16.8K | ﹤0.01% |
6,900
+4,600
| +200% | +$11.2K |
2024 Q4
6 quarters
|
|
7262
CALL
American Homes 4 Rent
AMH
$11.5B
| $16.8K | ﹤0.01% |
500
-1,800
| -78% | -$56.9K |
2026 Q1
1 quarter
|
|
7263
Niagen Bioscience
NAGE
$192M
| $16.7K | ﹤0.01% |
5,247
-21,430
| -80% | -$87K |
2025 Q3
3 quarters
|
|
7264
CALL
Greenland Energy Co
GLND
$131M
| $16.7K | ﹤0.01% |
+7,600
| New | +$30.6K |
2026 Q2
0 quarters
|
|
7265
YieldMax Short TSLA Option Income Strategy ETF
CRSH
$13.4M
| $16.7K | ﹤0.01% |
839
-1,228
| -59% | -$28.1K |
2024 Q3
7 quarters
|
|
7266
PUT
Grayscale Chainlink Trust ETF
GLNK
$124M
| $16.6K | ﹤0.01% |
2,600
+1,100
| +73% | +$8.7K |
2026 Q1
1 quarter
|
|
7267
CALL
Embecta
EMBC
$380M
| $16.6K | ﹤0.01% |
5,100
+1,100
| +28% | +$6K |
2025 Q1
5 quarters
|
|
7268
CALL
United States 12 Month Natural Gas Fund
UNL
$14.4M
| $16.6K | ﹤0.01% |
2,600
-4,100
| -61% | -$26.7K |
2025 Q3
3 quarters
|
|
7269
Build-A-Bear
BBW
$293M
| $16.6K | ﹤0.01% |
542
+133
| +33% | +$4.77K |
2025 Q4
2 quarters
|
|
7270
Teekay
TK
$1.29B
| $16.6K | ﹤0.01% |
1,656
-4,350
| -72% | -$54.4K |
2025 Q3
3 quarters
|
|
7271
PUT
MBX Biosciences
MBX
$2.34B
| $16.6K | ﹤0.01% |
300
-1,200
| -80% | -$41.9K |
2025 Q2
4 quarters
|
|
7272
PUT
Toro Corp
TORO
$150M
| $16.6K | ﹤0.01% |
+3,400
| New | +$17.6K |
2026 Q2
0 quarters
|
|
7273
CALL
Provident Financial Services
PFS
$3.03B
| $16.5K | ﹤0.01% |
700
-400
| -36% | -$8.98K |
2025 Q4
2 quarters
|
|
7274
Northwest Natural Holdings
NWN
$2.1B
| $16.5K | ﹤0.01% |
+337
| New | +$17.3K |
2026 Q2
0 quarters
|
|
7275
Braemar Hotels & Resorts
BHR
$96.8M
| $16.5K | ﹤0.01% |
7,641
-9,461
| -55% | -$22.7K |
2026 Q1
1 quarter
|
|
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.