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 | |
|---|---|---|---|---|---|---|
|
ECG
7151
Everus Construction Group
ECG
$5.99B
| $18.9K | ﹤0.01% |
114
-186
| -62% | -$27.3K |
|
7152
PUT
Alector
ALEC
$275M
| $18.9K | ﹤0.01% |
9,400
-600
| -6% | -$1.29K |
|
|
AUGO
7153
CALL
Aura Minerals Inc
AUGO
$7.12B
| $18.9K | ﹤0.01% |
300
-1,200
| -80% | -$94.6K |
|
|
AVB
7154
CALL
DELISTED
AvalonBay Communities
AVB
| $18.9K | ﹤0.01% |
100
-500
| -83% | -$90.4K |
|
|
WAY
7155
Waystar Holding Corp
WAY
$4.81B
| $18.8K | ﹤0.01% |
917
-1,691
| -65% | -$35.6K |
|
7156
CALL
The Bancorp
TBBK
$2.73B
| $18.8K | ﹤0.01% |
300
+200
| +200% | +$11.5K |
|
7157
PUT
Polestar Automotive Holding UK
PSNY
$1.51B
| $18.8K | ﹤0.01% |
1,000
-1,400
| -58% | -$28K |
|
7158
PUT
Colliers International
CIGI
$5.06B
| $18.8K | ﹤0.01% |
200
-600
| -75% | -$60.6K |
|
|
VLRS
7159
PUT
Controladora Vuela Compania de Aviacion
VLRS
$787M
| $18.7K | ﹤0.01% |
2,000
| – | – |
|
7160
Malibu Boats
MBUU
$549M
| $18.7K | ﹤0.01% |
683
+302
| +79% | +$8.03K |
|
7161
Edgewell Personal Care
EPC
$1.33B
| $18.7K | ﹤0.01% |
697
+143
| +26% | +$3.05K |
|
|
CIFU
7162
T-REX 2X Long CIFR Daily Target ETF
CIFU
$14.6M
| $18.7K | ﹤0.01% |
562
-2,951
| -84% | -$84.2K |
|
|
SPAL
7163
GraniteShares 2x Long SpaceX Daily ETF
SPAL
$36.5M
| $18.7K | ﹤0.01% |
+730
| New | +$19.5K |
|
7164
Health Catalyst
HCAT
$127M
| $18.7K | ﹤0.01% |
9,401
-4,220
| -31% | -$6.09K |
|
7165
Skye Bioscience
SKYE
$8.24M
| $18.7K | ﹤0.01% |
+3,372
| New | +$21.2K |
|
7166
Independence Realty Trust
IRT
$3.79B
| $18.7K | ﹤0.01% |
+1,120
| New | +$18.1K |
|
7167
PUT
Compass Minerals
CMP
$1.06B
| $18.7K | ﹤0.01% |
600
+300
| +100% | +$8.48K |
|
|
MAPS
7168
CALL
DELISTED
WM TECHNOLOGY INC A
MAPS
| $18.7K | ﹤0.01% |
47,500
-23,100
| -33% | -$10.5K |
|
7169
PUT
Calix
CALX
$2.26B
| $18.7K | ﹤0.01% |
+500
| New | +$21K |
|
7170
Concentrix
CNXC
$1.96B
| $18.6K | ﹤0.01% |
+831
| New | +$21.7K |
|
7171
CALL
NNN REIT
NNN
$8.57B
| $18.6K | ﹤0.01% |
400
-2,800
| -88% | -$125K |
|
7172
CALL
Exagen
XGN
$184M
| $18.6K | ﹤0.01% |
4,000
-17,100
| -81% | -$64.4K |
|
7173
CALL
RadNet
RDNT
$5.8B
| $18.5K | ﹤0.01% |
300
+200
| +200% | +$11.2K |
|
|
WBS
7174
DELISTED
Webster Financial
WBS
| $18.5K | ﹤0.01% |
242
+58
| +32% | +$4.22K |
|
7175
GoodRx Holdings
GDRX
$1.19B
| $18.5K | ﹤0.01% |
6,421
-48,833
| -88% | -$124K |
|
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.