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 | |
|---|---|---|---|---|---|---|---|
8326
PUT
BuzzFeed
BZFD
$86M
| $3.8K | ﹤0.01% |
2,600
| – | – |
2024 Q2
8 quarters
|
|
8327
iShares ESG Aware US Aggregate Bond ETF
EAGG
$5.08B
| $3.79K | ﹤0.01% |
+80
| New | +$3.79K |
2026 Q2
0 quarters
|
|
8328
PUT
Goldman Sachs BDC
GSBD
$978M
| $3.79K | ﹤0.01% |
400
-500
| -56% | -$4.64K |
2025 Q4
2 quarters
|
|
8329
CALL
Escalade
ESCA
$260M
| $3.76K | ﹤0.01% |
+200
| New | +$3.7K |
2026 Q2
0 quarters
|
|
8330
WisdomTree Global ex-U.S. Quality Growth Fund
DNL
$467M
| $3.74K | ﹤0.01% |
81
+42
| +108% | +$1.86K |
2026 Q1
1 quarter
|
|
8331
PUT
A10 Networks
ATEN
$1.77B
| $3.74K | ﹤0.01% |
+100
| New | +$2.9K |
2026 Q2
0 quarters
|
|
8332
CALL
Astronics
ATRO
$2.51B
| $3.73K | ﹤0.01% |
300
-1,860
| -86% | -$127K |
2024 Q2
8 quarters
|
|
8333
CALL
Quanex
NX
$955M
| $3.72K | ﹤0.01% |
200
+100
| +100% | +$1.85K |
2026 Q1
1 quarter
|
|
8334
CALL
Galectin Therapeutics
GALT
$340M
| $3.71K | ﹤0.01% |
800
-61,400
| -99% | -$159K |
2017 Q2
36 quarters
|
|
8335
PUT
Telephone and Data Systems
TDS
$3.97B
| $3.7K | ﹤0.01% |
100
| – | – |
2018 Q2
32 quarters
|
|
8336
PUT
IZEA Worldwide
IZEA
$40.6M
| $3.7K | ﹤0.01% |
+1,000
| New | +$3.9K |
2026 Q2
0 quarters
|
|
8337
Inseego
INSG
$73.9M
| $3.7K | ﹤0.01% |
358
-1,626
| -82% | -$21.8K |
2025 Q3
3 quarters
|
|
8338
Minerals Technologies
MTX
$1.98B
| $3.7K | ﹤0.01% |
+50
| New | +$3.78K |
2026 Q2
0 quarters
|
|
8339
CALL
Avient
AVNT
$3.68B
| $3.7K | ﹤0.01% |
100
-100
| -50% | -$3.62K |
2025 Q4
2 quarters
|
|
8340
PUT
Pennant Group
PNTG
$1.45B
| $3.7K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8341
First Trust Developed Markets ex-US AlphaDEX Fund
FDT
$1.36B
| $3.69K | ﹤0.01% |
+39
| New | +$3.73K |
2026 Q2
0 quarters
|
|
8342
Controladora Vuela Compania de Aviacion
VLRS
$658M
| $3.68K | ﹤0.01% |
+393
| New | +$3.03K |
2026 Q2
0 quarters
|
|
8343
CALL
Bitwise Hyperliquid ETF
BHYP
$138M
| $3.68K | ﹤0.01% |
+100
| New | +$3.48K |
2026 Q2
0 quarters
|
|
8344
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$213M
| $3.67K | ﹤0.01% |
+99
| New | +$3.77K |
2026 Q2
0 quarters
|
|
8345
CuriosityStream
CURI
$169M
| $3.66K | ﹤0.01% |
1,377
-6,925
| -83% | -$20.5K |
2025 Q3
3 quarters
|
|
8346
Bain Capital Specialty
BCSF
$665M
| $3.66K | ﹤0.01% |
292
+287
| +5,740% | +$3.74K |
2026 Q1
1 quarter
|
|
8347
PUT
Regencell Bioscience
RGC
$4.93B
| $3.65K | ﹤0.01% |
600
-2,000
| -77% | -$48K |
2026 Q1
1 quarter
|
|
8348
YieldMax AMD Option Income Strategy ETF
AMDY
$394M
| $3.64K | ﹤0.01% |
62
-975
| -94% | -$47.1K |
2025 Q2
4 quarters
|
|
8349
Themes Generative Artificial Intelligence ETF
WISE
$24.8M
| $3.63K | ﹤0.01% |
94
-162
| -63% | -$6.25K |
2025 Q4
2 quarters
|
|
8350
Westport Fuel Systems
WPRT
$40.5M
| $3.62K | ﹤0.01% |
+1,604
| New | +$3.22K |
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.