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 | |
|---|---|---|---|---|---|---|---|
8926
CALL
Greystone Housing Impact Investors LP
GHI
$116M
| $580 | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8927
T-REX 2X Long DJT Daily Target ETF
DJTU
$4.95M
| $568 | ﹤0.01% |
60
+41
| +216% | +$562 |
2025 Q4
2 quarters
|
|
8928
Culp Inc
CULP
$45.1M
| $567 | ﹤0.01% |
183
-344
| -65% | -$1.07K |
2025 Q2
4 quarters
|
|
|
QVCGA
8929
PUT
DELISTED
QVC Group Inc Series A
QVCGA
| $561 | ﹤0.01% |
5,100
-38,200
| -88% | -$60.8K |
2025 Q3
3 quarters
|
|
8930
PUT
Rekor Systems
REKR
$41.7M
| $556 | ﹤0.01% |
800
| – | – |
2023 Q1
13 quarters
|
|
8931
BOK Financial
BOKF
$7.82B
| $555 | ﹤0.01% |
+4
| New | +$529 |
2026 Q2
0 quarters
|
|
8932
InfraCap MLP ETF
AMZA
$477M
| $554 | ﹤0.01% |
+12
| New | +$555 |
2026 Q2
0 quarters
|
|
8933
Goldman Sachs Innovate Equity ETF
GINN
$184M
| $551 | ﹤0.01% |
7
-14
| -67% | -$1.06K |
2026 Q1
1 quarter
|
|
8934
Hanmi Financial
HAFC
$953M
| $550 | ﹤0.01% |
17
-98
| -85% | -$2.92K |
2025 Q3
3 quarters
|
|
8935
CALL
BrightSpire Capital
BRSP
$463M
| $545 | ﹤0.01% |
+100
| New | +$573 |
2026 Q2
0 quarters
|
|
8936
CALL
Inter&Co
INTR
$3.17B
| $543 | ﹤0.01% |
100
-86,000
| -100% | -$578K |
2023 Q4
10 quarters
|
|
8937
Direxion Daily AMD Bear 1X ETF
AMDD
$29.3M
| $543 | ﹤0.01% |
+21
| New | +$957 |
2026 Q2
0 quarters
|
|
8938
PUT
AGNT Inc
AGNT
$692M
| $541 | ﹤0.01% |
+100
| New | +$551 |
2026 Q2
0 quarters
|
|
8939
PUT
Ovid Therapeutics
OVID
$422M
| $538 | ﹤0.01% |
200
-100
| -33% | -$258 |
2025 Q3
3 quarters
|
|
8940
PUT
Ideal Power
IPWR
$44.9M
| $536 | ﹤0.01% |
+100
| New | +$509 |
2026 Q2
0 quarters
|
|
8941
PUT
ADC Therapeutics
ADCT
$184M
| $535 | ﹤0.01% |
500
-200
| -29% | -$583 |
2025 Q2
4 quarters
|
|
8942
ProShares Short Ether Strategy ETF
SETH
$8.84M
| $527 | ﹤0.01% |
9
-514
| -98% | -$24.7K |
2025 Q3
3 quarters
|
|
8943
PUT
DLH Holdings
DLHC
$54.6M
| $525 | ﹤0.01% |
100
| – | – |
2026 Q1
1 quarter
|
|
8944
InspireMD
NSPR
$21M
| $521 | ﹤0.01% |
745
+142
| +24% | +$151 |
2025 Q3
3 quarters
|
|
8945
PUT
Accuray
ARAY
$15.5M
| $516 | ﹤0.01% |
+2,000
| New | +$744 |
2026 Q2
0 quarters
|
|
8946
ARK Blockchain & Fintech Innovation ETF
ARKF
$777M
| $512 | ﹤0.01% |
+13
| New | +$529 |
2026 Q2
0 quarters
|
|
8947
AH Realty Trust
AHRT
$455M
| $509 | ﹤0.01% |
72
-1,666
| -96% | -$10.7K |
2025 Q4
2 quarters
|
|
8948
CALL
FTC Solar
FTCI
$24.5M
| $508 | ﹤0.01% |
100
-900
| -90% | -$4.17K |
2025 Q4
2 quarters
|
|
8949
CALL
Goldgroup Mining
GORO
$558M
| $504 | ﹤0.01% |
100
-3,850
| -97% | -$21K |
2025 Q1
5 quarters
|
|
8950
ProQR Therapeutics
PRQR
$182M
| $504 | ﹤0.01% |
271
-24,597
| -99% | -$40.5K |
2025 Q4
2 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.