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 | |
|---|---|---|---|---|---|---|---|
7876
ProShares Ultra CRCL
CRCA
$108M
| $7.8K | ﹤0.01% |
609
-4,256
| -87% | -$164K |
2025 Q3
3 quarters
|
|
7877
NiSource
NI
$21B
| $7.8K | ﹤0.01% |
164
-12,863
| -99% | -$609K |
2025 Q1
5 quarters
|
|
7878
Amplify CWP Growth & Income ETF
QDVO
$759M
| $7.79K | ﹤0.01% |
261
+104
| +66% | +$3.07K |
2026 Q1
1 quarter
|
|
7879
PUT
GoPro
GPRO
$210M
| $7.78K | ﹤0.01% |
10,000
-100
| -1% | -$106 |
2021 Q2
20 quarters
|
|
7880
PUT
Power Solutions International
PSIX
$1.09B
| $7.78K | ﹤0.01% |
200
-3,200
| -94% | -$176K |
2025 Q3
3 quarters
|
|
7881
PUT
Alta Equipment Group
ALTG
$208M
| $7.76K | ﹤0.01% |
1,200
+1,000
| +500% | +$6.71K |
2025 Q3
3 quarters
|
|
7882
VistaShares Electrification Supercycle ETF
POW
$51.1M
| $7.75K | ﹤0.01% |
+250
| New | +$7.47K |
2026 Q2
0 quarters
|
|
7883
PUT
IRSA Inversiones y Representaciones
IRS
$1.2B
| $7.72K | ﹤0.01% |
500
| – | – |
2025 Q1
5 quarters
|
|
7884
PUT
Solventum
SOLV
$14.9B
| $7.72K | ﹤0.01% |
100
-1,700
| -94% | -$124K |
2024 Q2
8 quarters
|
|
7885
ProShares Ultra Euro
ULE
$3.56M
| $7.69K | ﹤0.01% |
+622
| New | +$7.98K |
2026 Q2
0 quarters
|
|
7886
Senseonics Holdings Inc
SENS
$391M
| $7.67K | ﹤0.01% |
+1,350
| New | +$8.65K |
2026 Q2
0 quarters
|
|
7887
PUT
Alpha Architect US Quantitative Value ETF
QVAL
$656M
| $7.66K | ﹤0.01% |
200
-200
| -50% | -$10.9K |
2025 Q4
2 quarters
|
|
7888
PUT
Haverty Furniture Companies
HVT
$466M
| $7.66K | ﹤0.01% |
+300
| New | +$6.8K |
2026 Q2
0 quarters
|
|
7889
CALL
SEACOR Marine Holdings
SMHI
$226M
| $7.65K | ﹤0.01% |
1,000
+500
| +100% | +$3.71K |
2025 Q2
4 quarters
|
|
7890
PUT
Travel + Leisure Co
TNL
$4.13B
| $7.64K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
7891
CALL
Central Pacific Financial
CPF
$972M
| $7.64K | ﹤0.01% |
200
-2,900
| -94% | -$101K |
2025 Q3
3 quarters
|
|
7892
CALL
Apyx Medical
APYX
$102M
| $7.63K | ﹤0.01% |
1,700
-500
| -23% | -$1.98K |
2025 Q2
4 quarters
|
|
7893
PUT
National Health Investors
NHI
$3.29B
| $7.63K | ﹤0.01% |
100
| – | – |
2025 Q2
4 quarters
|
|
7894
Gencor Industries
GENC
$256M
| $7.62K | ﹤0.01% |
511
+55
| +12% | +$815 |
2025 Q4
2 quarters
|
|
7895
CALL
Talphera
TLPH
$54.5M
| $7.62K | ﹤0.01% |
7,400
+5,100
| +222% | +$4.35K |
2025 Q4
2 quarters
|
|
7896
PUT
Grayscale Dogecoin Trust ETF
GDOG
$6.14M
| $7.62K | ﹤0.01% |
+900
| New | +$10.1K |
2026 Q2
0 quarters
|
|
7897
PUT
Zenas BioPharma
ZBIO
$1.84B
| $7.61K | ﹤0.01% |
300
-1,100
| -79% | -$21.9K |
2025 Q4
2 quarters
|
|
7898
PUT
Autohome
ATHM
$2.35B
| $7.61K | ﹤0.01% |
400
| – | – |
2026 Q1
1 quarter
|
|
7899
CALL
Excelerate Energy
EE
$989M
| $7.6K | ﹤0.01% |
+200
| New | +$6.89K |
2026 Q2
0 quarters
|
|
7900
CALL
Aegon
AEG
$12.2B
| $7.6K | ﹤0.01% |
900
-9,500
| -91% | -$78.3K |
2024 Q4
6 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.