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 | |
|---|---|---|---|---|---|---|---|
7601
PUT
SLR Investment Corp
SLRC
$609M
| $11.1K | ﹤0.01% |
+900
| New | +$12.5K |
2026 Q2
0 quarters
|
|
7602
PUT
Milestone Pharmaceuticals
MIST
$80.7M
| $11.1K | ﹤0.01% |
8,300
-71,400
| -90% | -$114K |
2026 Q1
1 quarter
|
|
7603
PUT
TROOPS Inc
TROO
$287M
| $11.1K | ﹤0.01% |
+4,500
| New | +$14.2K |
2026 Q2
0 quarters
|
|
7604
Orchestra BioMed
OBIO
$336M
| $11.1K | ﹤0.01% |
2,564
+183
| +8% | +$748 |
2026 Q1
1 quarter
|
|
7605
CALL
Rekor Systems
REKR
$41.7M
| $11K | ﹤0.01% |
15,900
-64,400
| -80% | -$50.5K |
2020 Q4
22 quarters
|
|
7606
PUT
Eve Holding
EVEX
$572M
| $11K | ﹤0.01% |
+4,400
| New | +$12.7K |
2026 Q2
0 quarters
|
|
7607
PUT
Saic
SAIC
$6.11B
| $11K | ﹤0.01% |
100
-900
| -90% | -$91K |
2026 Q1
1 quarter
|
|
7608
PUT
Similarweb
SMWB
$776M
| $11K | ﹤0.01% |
1,800
+1,400
| +350% | +$5.09K |
2024 Q3
7 quarters
|
|
7609
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.2B
| $11K | ﹤0.01% |
+102
| New | +$10.6K |
2026 Q2
0 quarters
|
|
7610
CALL
Assembly Biosciences
ASMB
$404M
| $11K | ﹤0.01% |
400
+200
| +100% | +$5.44K |
2025 Q3
3 quarters
|
|
7611
MasterBrand
MBC
$1.49B
| $11K | ﹤0.01% |
1,067
+909
| +575% | +$7.76K |
2025 Q4
2 quarters
|
|
7612
Brookfield Infrastructure
BIPC
$4.59B
| $11K | ﹤0.01% |
+285
| New | +$11.5K |
2026 Q2
0 quarters
|
|
7613
PUT
Washington Trust Bancorp
WASH
$744M
| $10.9K | ﹤0.01% |
300
+100
| +50% | +$3.34K |
2024 Q4
6 quarters
|
|
7614
PUT
Distribution Solutions Group
DSGR
$1.62B
| $10.9K | ﹤0.01% |
400
-76,800
| -99% | -$2.1M |
2026 Q1
1 quarter
|
|
7615
CALL
Walker & Dunlop
WD
$1.17B
| $10.9K | ﹤0.01% |
200
| – | – |
2026 Q1
1 quarter
|
|
7616
Xtrackers Semiconductor Select Equity ETF
CHPS
$119M
| $10.9K | ﹤0.01% |
+105
| New | +$8.56K |
2026 Q2
0 quarters
|
|
7617
Telefônica Brasil
VIV
$20.7B
| $10.9K | ﹤0.01% |
+830
| New | +$12.1K |
2026 Q2
0 quarters
|
|
7618
PUT
FT Vest Nasdaq-100 Moderate Buffer ETF - February
QMFE
$44.5M
| $10.9K | ﹤0.01% |
500
+200
| +67% | +$4.76K |
2026 Q1
1 quarter
|
|
7619
PUT
Invesco CurrencyShares Swiss Franc Trust
FXF
$368M
| $10.9K | ﹤0.01% |
100
-600
| -86% | -$67K |
2026 Q1
1 quarter
|
|
7620
PUT
Pacer Trendpilot US Large Cap ETF
PTLC
$3.29B
| $10.9K | ﹤0.01% |
300
+200
| +200% | +$11.3K |
2025 Q3
3 quarters
|
|
7621
YieldMax AMZN Option Income Strategy ETF
AMZY
$207M
| $10.9K | ﹤0.01% |
+1,021
| New | +$12.1K |
2026 Q2
0 quarters
|
|
7622
WisdomTree Cybersecurity Fund
WCBR
$207M
| $10.9K | ﹤0.01% |
301
+299
| +14,950% | +$8.88K |
2026 Q1
1 quarter
|
|
7623
PUT
Ocean Power Technologies
OPTT
$6.19M
| $10.9K | ﹤0.01% |
1,387
-153
| -10% | -$1.56K |
2024 Q4
6 quarters
|
|
7624
PUT
Emergent Biosolutions
EBS
$319M
| $10.9K | ﹤0.01% |
1,300
+1,100
| +550% | +$9.2K |
2021 Q1
21 quarters
|
|
7625
CALL
Aldeyra Therapeutics
ALDX
$39.2M
| $10.9K | ﹤0.01% |
5,100
-35,500
| -87% | -$61K |
2020 Q2
24 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.