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 | |
|---|---|---|---|---|---|---|---|
6926
CALL
enGene Therapeutics
ENGN
$105M
| $24.4K | ﹤0.01% |
+14,100
| New | +$57.5K |
2026 Q2
0 quarters
|
|
6927
PUT
Dime Commercial Bancshares
DCOM
$1.89B
| $24.4K | ﹤0.01% |
600
-4,800
| -89% | -$178K |
2026 Q1
1 quarter
|
|
6928
PUT
Edgewise Therapeutics
EWTX
$4.27B
| $24.4K | ﹤0.01% |
600
-16,700
| -97% | -$576K |
2024 Q2
8 quarters
|
|
6929
CALL
WD-40
WDFC
$2.85B
| $24.4K | ﹤0.01% |
100
| – | – |
2020 Q4
22 quarters
|
|
6930
ATS Corp
ATS
$1.86B
| $24.3K | ﹤0.01% |
+846
| New | +$26K |
2026 Q2
0 quarters
|
|
6931
Commercial Metals
CMC
$6.94B
| $24.3K | ﹤0.01% |
+388
| New | +$27.3K |
2026 Q2
0 quarters
|
|
6932
CALL
Presidio Production Co
FTW
$305M
| $24.3K | ﹤0.01% |
+2,000
| New | +$22.9K |
2026 Q2
0 quarters
|
|
6933
CALL
H2O America
HTO
$2.47B
| $24.3K | ﹤0.01% |
400
-100
| -20% | -$5.8K |
2025 Q2
4 quarters
|
|
6934
PUT
TTEC Holdings
TTEC
$74.4M
| $24.2K | ﹤0.01% |
12,500
+12,100
| +3,025% | +$31.3K |
2025 Q2
4 quarters
|
|
6935
State Street SPDR NYSE Technology ETF
XNTK
$1.91B
| $24.2K | ﹤0.01% |
+62
| New | +$20.7K |
2026 Q2
0 quarters
|
|
6936
WisdomTree Efficient Gold Plus Equity Strategy Fund
GDE
$437M
| $24.2K | ﹤0.01% |
+396
| New | +$26.3K |
2026 Q2
0 quarters
|
|
6937
Global Self Storage
SELF
$55.7M
| $24.2K | ﹤0.01% |
4,613
-2,005
| -30% | -$10.5K |
2026 Q1
1 quarter
|
|
6938
CALL
Core & Main
CNM
$7.74B
| $24.1K | ﹤0.01% |
500
| – | – |
2023 Q4
10 quarters
|
|
|
6939
PUT
Core & Main
CNM
$7.74B
| $24.1K | ﹤0.01% |
500
+300
| +150% | +$14.8K |
2023 Q4
10 quarters
|
|
6940
Neostellar Capital Corp
NSLR
$156M
| $24.1K | ﹤0.01% |
+1,922
| New | +$25.3K |
2026 Q2
0 quarters
|
|
6941
Tradr 2X Long COHR Daily ETF
COHX
$28.7M
| $24.1K | ﹤0.01% |
430
-386
| -47% | -$19.8K |
2026 Q1
1 quarter
|
|
6942
PUT
Enova International
ENVA
$4.04B
| $24.1K | ﹤0.01% |
+100
| New | +$17.2K |
2026 Q2
0 quarters
|
|
6943
ICL Group
ICL
$6.16B
| $24K | ﹤0.01% |
+4,827
| New | +$27.4K |
2026 Q2
0 quarters
|
|
6944
PUT
Sally Beauty Holdings
SBH
$1.63B
| $24K | ﹤0.01% |
1,700
-38,800
| -96% | -$523K |
2017 Q3
35 quarters
|
|
6945
PUT
JELD-WEN Holding
JELD
$119M
| $24K | ﹤0.01% |
16,000
+15,200
| +1,900% | +$23.4K |
2025 Q3
3 quarters
|
|
6946
PUT
Aveanna Healthcare
AVAH
$2.92B
| $24K | ﹤0.01% |
2,800
+2,100
| +300% | +$14.8K |
2026 Q1
1 quarter
|
|
6947
Claros Mortgage Trust
CMTG
$171M
| $24K | ﹤0.01% |
10,206
+132
| +1% | +$324 |
2024 Q2
8 quarters
|
|
6948
PUT
4D Molecular Therapeutics
FDMT
$597M
| $23.9K | ﹤0.01% |
1,800
-32,000
| -95% | -$312K |
2026 Q1
1 quarter
|
|
6949
Permianville Royalty Trust
PVL
$59.4M
| $23.9K | ﹤0.01% |
+14,128
| New | +$26.3K |
2026 Q2
0 quarters
|
|
6950
CALL
Mitsubishi UFJ Financial
MUFG
$237B
| $23.9K | ﹤0.01% |
1,200
-7,900
| -87% | -$149K |
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.