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 | |
|---|---|---|---|---|---|---|---|
6276
PUT
Smith & Wesson
SWBI
$621M
| $51.1K | ﹤0.01% |
3,400
-3,400
| -50% | -$51.1K |
2015 Q4
42 quarters
|
|
6277
PUT
FT Vest Gold Strategy Target Income ETF
IGLD
$574M
| $51.1K | ﹤0.01% |
1,000
+900
| +900% | +$21.5K |
2022 Q2
16 quarters
|
|
6278
Rayonier Advanced Materials
RYAM
$438M
| $51.1K | ﹤0.01% |
+6,503
| New | +$59K |
2026 Q2
0 quarters
|
|
6279
CALL
Filana Therapeutics
FLNA
$29.6M
| $51.1K | ﹤0.01% |
42,900
-19,500
| -31% | -$27.8K |
2021 Q1
21 quarters
|
|
6280
Direxion Daily Technology Bear 3x ETF
TECS
$72.5M
| $50.8K | ﹤0.01% |
826
+203
| +33% | +$20.5K |
2026 Q1
1 quarter
|
|
6281
PUT
Bentley Systems
BSY
$12B
| $50.8K | ﹤0.01% |
1,700
-10,900
| -87% | -$354K |
2025 Q2
4 quarters
|
|
6282
Volatility Shares Trust XRP 2X ETF
XRPT
$70.7M
| $50.8K | ﹤0.01% |
2,335
+1,984
| +565% | +$73.4K |
2025 Q2
4 quarters
|
|
6283
Comtech Telecommunications
CMTL
$39.5M
| $50.8K | ﹤0.01% |
24,188
+17,298
| +251% | +$66.5K |
2026 Q1
1 quarter
|
|
6284
CALL
Aaon
AAON
$5.84B
| $50.7K | ﹤0.01% |
400
+200
| +100% | +$23.4K |
2023 Q1
13 quarters
|
|
6285
CALL
Balchem Corp
BCPC
$5.44B
| $50.7K | ﹤0.01% |
300
| – | – |
2025 Q4
2 quarters
|
|
6286
PUT
Tactile Systems Technology
TCMD
$530M
| $50.6K | ﹤0.01% |
1,700
-400
| -19% | -$10.1K |
2025 Q3
3 quarters
|
|
6287
PUT
DXP Enterprises
DXPE
$2.55B
| $50.6K | ﹤0.01% |
300
+200
| +200% | +$31.6K |
2025 Q4
2 quarters
|
|
6288
PUT
Magnachip Semiconductor
MX
$177M
| $50.6K | ﹤0.01% |
10,700
+10,400
| +3,467% | +$50.4K |
2026 Q1
1 quarter
|
|
6289
Invesco S&P 500 High Beta ETF
SPHB
$814M
| $50.6K | ﹤0.01% |
+325
| New | +$45.3K |
2026 Q2
0 quarters
|
|
6290
PUT
BlackRock US Equity Factor Rotation ETF
DYNF
$42.3B
| $50.5K | ﹤0.01% |
900
| – | – |
2025 Q2
4 quarters
|
|
6291
Zai Lab
ZLAB
$2.73B
| $50.5K | ﹤0.01% |
2,657
+922
| +53% | +$18.2K |
2025 Q4
2 quarters
|
|
|
PLCY
6292
PUT
DELISTED
EventShares U.S. Legislative Opportunities ETF
PLCY
| $50.5K | ﹤0.01% |
1,000
+800
| +400% | +$40.4K |
2024 Q4
6 quarters
|
|
6293
Helen of Troy
HELE
$667M
| $50.4K | ﹤0.01% |
1,734
-1,304
| -43% | -$30.8K |
2026 Q1
1 quarter
|
|
6294
CALL
Duos Technologies
DUOT
$184M
| $50.4K | ﹤0.01% |
4,200
-8,600
| -67% | -$86.5K |
2025 Q4
2 quarters
|
|
6295
CALL
JELD-WEN Holding
JELD
$123M
| $50.4K | ﹤0.01% |
33,600
+5,400
| +19% | +$8.32K |
2026 Q1
1 quarter
|
|
6296
Leverage Shares 2x Long FUTU Daily ETF
FUTG
$20.2M
| $50.4K | ﹤0.01% |
+15,595
| New | +$121K |
2026 Q2
0 quarters
|
|
6297
PUT
Proficient Auto Logistics
PAL
$71.5M
| $50.4K | ﹤0.01% |
7,400
+5,400
| +270% | +$36.1K |
2026 Q1
1 quarter
|
|
6298
CALL
Worthington Steel
WS
$2.16B
| $50.4K | ﹤0.01% |
1,500
+1,300
| +650% | +$49.8K |
2025 Q2
4 quarters
|
|
6299
PUT
ACI Worldwide
ACIW
$5.62B
| $50.3K | ﹤0.01% |
1,000
| – | – |
2025 Q3
3 quarters
|
|
6300
Pioneer Power Solutions
PPSI
$27.5M
| $50.2K | ﹤0.01% |
12,751
+12,401
| +3,543% | +$48.8K |
2025 Q3
3 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.