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 | |
|---|---|---|---|---|---|---|---|
8051
PUT
Orchestra BioMed
OBIO
$329M
| $6.04K | ﹤0.01% |
1,400
-1,100
| -44% | -$4.5K |
2025 Q4
2 quarters
|
|
8052
PUT
First Tracks Biotherapeutics
TRAX
$1.54B
| $6.04K | ﹤0.01% |
+300
| New | +$5.61K |
2026 Q2
0 quarters
|
|
8053
Leverage Shares 2X Long SPOT Daily ETF
SPOG
$4.25M
| $6.04K | ﹤0.01% |
964
-563
| -37% | -$3.97K |
2026 Q1
1 quarter
|
|
8054
PUT
Highwoods Properties
HIW
$3.36B
| $6.03K | ﹤0.01% |
200
| – | – |
2021 Q4
18 quarters
|
|
8055
Defiance Leveraged Long Income MSTR ETF
MST
$23.3M
| $6.03K | ﹤0.01% |
837
-901
| -52% | -$21.4K |
2026 Q1
1 quarter
|
|
8056
IZEA Worldwide
IZEA
$40.9M
| $6K | ﹤0.01% |
+1,622
| New | +$6.32K |
2026 Q2
0 quarters
|
|
8057
PUT
Duos Technologies
DUOT
$189M
| $6K | ﹤0.01% |
+500
| New | +$5.03K |
2026 Q2
0 quarters
|
|
8058
Brookfield Business Corp Class A Subordinate Voting Shares
BBUC
$5.76B
| $6K | ﹤0.01% |
201
+63
| +46% | +$2.08K |
2025 Q4
2 quarters
|
|
8059
PUT
Cousins Properties
CUZ
$4.72B
| $6K | ﹤0.01% |
200
| – | – |
2024 Q2
8 quarters
|
|
8060
Simplify Volt TSLA Revolution ETF
TESL
$13.2M
| $5.99K | ﹤0.01% |
360
+272
| +309% | +$4.25K |
2026 Q1
1 quarter
|
|
8061
PUT
Nautilus Biotechnolgy
NAUT
$331M
| $5.98K | ﹤0.01% |
3,200
+3,100
| +3,100% | +$8.18K |
2025 Q4
2 quarters
|
|
8062
Mereo BioPharma
MREO
$45.9M
| $5.97K | ﹤0.01% |
+18,780
| New | +$5.63K |
2026 Q2
0 quarters
|
|
8063
PUT
AdvanSix
ASIX
$423M
| $5.96K | ﹤0.01% |
300
+200
| +200% | +$4.5K |
2025 Q1
5 quarters
|
|
8064
PUT
Wise Group
WSE
$10.8B
| $5.96K | ﹤0.01% |
+500
| New | +$5.97K |
2026 Q2
0 quarters
|
|
8065
PUT
Bank of N.T. Butterfield & Son
NTB
$2.37B
| $5.95K | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8066
Global X Clean Water ETF
AQWA
$21.2M
| $5.95K | ﹤0.01% |
304
+105
| +53% | +$2.01K |
2026 Q1
1 quarter
|
|
8067
CALL
Bicara Therapeutics
BCAX
$1.17B
| $5.94K | ﹤0.01% |
200
-13,600
| -99% | -$304K |
2024 Q4
6 quarters
|
|
8068
PUT
DELISTED
Xtrackers Risk Managed USD High Yield Strategy ETF
HYRM
| $5.93K | ﹤0.01% |
+200
| New | +$4.64K |
2026 Q2
0 quarters
|
|
8069
Vanguard ESG International Stock ETF
VSGX
$6.53B
| $5.93K | ﹤0.01% |
72
-104
| -59% | -$8.25K |
2026 Q1
1 quarter
|
|
8070
PUT
ProKidney
PROK
$299M
| $5.92K | ﹤0.01% |
2,900
-3,300
| -53% | -$6.04K |
2025 Q3
3 quarters
|
|
8071
PUT
MediWound
MDWD
$157M
| $5.88K | ﹤0.01% |
400
-41,800
| -99% | -$664K |
2024 Q1
9 quarters
|
|
8072
Diginex Ltd
DGNX
$36.4M
| $5.88K | ﹤0.01% |
+3,973
| New | +$8.2K |
2026 Q2
0 quarters
|
|
8073
CALL
State Street DoubleLine Short Duration Total Return Tactical ETF
STOT
$542M
| $5.85K | ﹤0.01% |
+200
| New | +$9.41K |
2026 Q2
0 quarters
|
|
8074
enCore Energy
EU
$150M
| $5.84K | ﹤0.01% |
+4,455
| New | +$7.49K |
2026 Q2
0 quarters
|
|
8075
YieldMax HOOD Option Income Strategy ETF
HOOY
$97.9M
| $5.83K | ﹤0.01% |
191
-184
| -49% | -$5.42K |
2025 Q3
3 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.