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 | |
|---|---|---|---|---|---|---|---|
6151
CALL
IDT Corp
IDT
$2.01B
| $58.2K | ﹤0.01% |
+1,000
| New | +$52.9K |
2026 Q2
0 quarters
|
|
6152
CALL
Omnicell
OMCL
$1.68B
| $58.1K | ﹤0.01% |
1,400
+1,300
| +1,300% | +$52.4K |
2017 Q4
34 quarters
|
|
6153
PUT
Vanguard S&P 500 Growth ETF
VOOG
$27.2B
| $58.1K | ﹤0.01% |
1,000
-1,400
| -58% | -$111K |
2024 Q1
9 quarters
|
|
6154
PUT
National Grid
NGG
$81.9B
| $58K | ﹤0.01% |
700
-3,400
| -83% | -$289K |
2016 Q1
41 quarters
|
|
6155
PUT
Texas Roadhouse
TXRH
$10.9B
| $58K | ﹤0.01% |
300
+200
| +200% | +$34.1K |
2017 Q3
35 quarters
|
|
6156
PUT
Net Lease Office Properties
NLOP
$140M
| $57.9K | ﹤0.01% |
5,200
-11,900
| -70% | -$143K |
2025 Q2
4 quarters
|
|
6157
GCM Grosvenor
GCMG
$740M
| $57.9K | ﹤0.01% |
+4,705
| New | +$51.5K |
2026 Q2
0 quarters
|
|
6158
CALL
CVR Energy
CVI
$5.73B
| $57.8K | ﹤0.01% |
2,100
-16,000
| -88% | -$508K |
2019 Q1
29 quarters
|
|
6159
PUT
DELISTED
Esperion Therapeutics
ESPR
| $57.8K | ﹤0.01% |
18,300
-52,000
| -74% | -$145K |
2026 Q1
1 quarter
|
|
6160
PUT
Cumberland Pharmaceuticals
CPIX
$75.2M
| $57.7K | ﹤0.01% |
8,900
+6,600
| +287% | +$31.6K |
2026 Q1
1 quarter
|
|
6161
CALL
Ascent Solar Technologies
ASTI
$16.7M
| $57.5K | ﹤0.01% |
+11,500
| New | +$62.1K |
2026 Q2
0 quarters
|
|
6162
CALL
ArcBest
ARCB
$2.88B
| $57.4K | ﹤0.01% |
400
+300
| +300% | +$39K |
2025 Q2
4 quarters
|
|
6163
Chemours
CC
$2B
| $57.3K | ﹤0.01% |
+2,794
| New | +$64K |
2026 Q2
0 quarters
|
|
6164
CALL
GCT Semiconductor Holding
GCTS
$120M
| $57.3K | ﹤0.01% |
+19,300
| New | +$41K |
2026 Q2
0 quarters
|
|
6165
CALL
Impinj
PI
$5.41B
| $57.3K | ﹤0.01% |
400
-1,600
| -80% | -$209K |
2016 Q4
38 quarters
|
|
6166
Mayville Engineering Co
MEC
$351M
| $57.3K | ﹤0.01% |
+1,529
| New | +$40.9K |
2026 Q2
0 quarters
|
|
6167
CNH Industrial
CNH
$18B
| $57.3K | ﹤0.01% |
+5,100
| New | +$54.3K |
2026 Q2
0 quarters
|
|
6168
Allient
ALNT
$1.6B
| $57.2K | ﹤0.01% |
+556
| New | +$42.9K |
2026 Q2
0 quarters
|
|
6169
CALL
Fidus Investment
FDUS
$756M
| $57.2K | ﹤0.01% |
3,000
-1,000
| -25% | -$18.6K |
2025 Q1
5 quarters
|
|
6170
Orion Group Holdings
ORN
$373M
| $57.2K | ﹤0.01% |
3,401
+2,577
| +313% | +$35.6K |
2025 Q1
5 quarters
|
|
6171
Weibo
WB
$1.52B
| $57.1K | ﹤0.01% |
+7,869
| New | +$64.2K |
2026 Q2
0 quarters
|
|
6172
Sturm, Ruger & Co
RGR
$740M
| $57K | ﹤0.01% |
1,506
-568
| -27% | -$22.8K |
2025 Q4
2 quarters
|
|
6173
PUT
Alto Ingredients
ALTO
$280M
| $57K | ﹤0.01% |
10,000
+3,400
| +52% | +$17.4K |
2025 Q1
5 quarters
|
|
6174
CALL
Napco Security Technologies
NSSC
$1.41B
| $57K | ﹤0.01% |
+1,500
| New | +$59.6K |
2026 Q2
0 quarters
|
|
6175
PUT
Immersion
IMMR
$238M
| $56.9K | ﹤0.01% |
8,400
| – | – |
2020 Q1
25 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.