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 | |
|---|---|---|---|---|---|---|---|
8176
Leverage Shares 2X Long TSLA Daily ETF
TSLG
$52.5M
| $4.96K | ﹤0.01% |
704
-492
| -41% | -$3.25K |
2025 Q2
4 quarters
|
|
8177
Viridian Therapeutics
VRDN
$2.62B
| $4.96K | ﹤0.01% |
+270
| New | +$4.35K |
2026 Q2
0 quarters
|
|
8178
Stereotaxis
STXS
$100M
| $4.95K | ﹤0.01% |
+2,880
| New | +$5.41K |
2026 Q2
0 quarters
|
|
8179
PUT
TriNet
TNET
$3.37B
| $4.95K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8180
CALL
American Assets Trust
AAT
$1.29B
| $4.94K | ﹤0.01% |
200
-400
| -67% | -$8.77K |
2025 Q4
2 quarters
|
|
8181
PUT
Stitch Fix
SFIX
$365M
| $4.93K | ﹤0.01% |
1,200
+400
| +50% | +$1.46K |
2021 Q1
21 quarters
|
|
8182
PUT
Northern Trust Morningstar US Market Factor Tilt ETF
TILT
$2.21B
| $4.93K | ﹤0.01% |
+100
| New | +$26.6K |
2026 Q2
0 quarters
|
|
8183
CALL
Ceragon Networks
CRNT
$175M
| $4.92K | ﹤0.01% |
1,900
-8,300
| -81% | -$21.7K |
2023 Q1
13 quarters
|
|
8184
Nomura Holdings
NMR
$26.5B
| $4.91K | ﹤0.01% |
559
-145
| -21% | -$1.21K |
2025 Q3
3 quarters
|
|
8185
PUT
The Greenbrier Companies
GBX
$1.19B
| $4.9K | ﹤0.01% |
100
-300
| -75% | -$14.7K |
2014 Q4
46 quarters
|
|
8186
CALL
Fortress Biotech
FBIO
$66M
| $4.9K | ﹤0.01% |
1,600
-17,800
| -92% | -$45.9K |
2024 Q3
7 quarters
|
|
8187
CalciMedica
CALC
$7.92M
| $4.86K | ﹤0.01% |
945
-1,618
| -63% | -$5.74K |
2026 Q1
1 quarter
|
|
8188
Expro Ltd
XPRO
$1.76B
| $4.86K | ﹤0.01% |
+329
| New | +$5.28K |
2026 Q2
0 quarters
|
|
8189
Tema Electrification ETF
VOLT
$676M
| $4.86K | ﹤0.01% |
+116
| New | +$4.55K |
2026 Q2
0 quarters
|
|
8190
Fidelity Clean Energy ETF
FRNW
$85.4M
| $4.85K | ﹤0.01% |
+199
| New | +$5K |
2026 Q2
0 quarters
|
|
8191
CALL
Goosehead Insurance
GSHD
$1.2B
| $4.85K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8192
PUT
Xponential Fitness
XPOF
$182M
| $4.84K | ﹤0.01% |
700
| – | – |
2021 Q4
18 quarters
|
|
8193
PUT
Diana Shipping
DSX
$316M
| $4.83K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$5.43K |
2025 Q4
2 quarters
|
|
8194
PUT
SunCoke Energy
SXC
$839M
| $4.83K | ﹤0.01% |
600
-200
| -25% | -$1.54K |
2026 Q1
1 quarter
|
|
8195
CALL
Xencor
XNCR
$1.92B
| $4.83K | ﹤0.01% |
300
-4,700
| -94% | -$58.7K |
2025 Q3
3 quarters
|
|
8196
Prosperity Bancshares
PB
$8.4B
| $4.82K | ﹤0.01% |
+66
| New | +$4.59K |
2026 Q2
0 quarters
|
|
8197
KraneShares 2x Long PDD Daily ETF
KPDD
$14.5M
| $4.82K | ﹤0.01% |
+1,048
| New | +$7.44K |
2026 Q2
0 quarters
|
|
8198
CALL
Oil States International
OIS
$490M
| $4.81K | ﹤0.01% |
600
+400
| +200% | +$3.79K |
2026 Q1
1 quarter
|
|
8199
CALL
PetMed Express
PETS
$25.8M
| $4.8K | ﹤0.01% |
2,500
-23,400
| -90% | -$49.7K |
2025 Q4
2 quarters
|
|
8200
CALL
Entera Bio
ENTX
$523M
| $4.78K | ﹤0.01% |
+2,700
| New | +$3.38K |
2026 Q2
0 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.