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 | |
|---|---|---|---|---|---|---|
7701
CALL
CONMED
CNMD
$1.48B
| $9.82K | ﹤0.01% |
+300
| New | +$10.8K |
|
7702
PUT
Costamare
CMRE
$1.88B
| $9.81K | ﹤0.01% |
700
-100
| -13% | -$1.64K |
|
7703
BlackRock US Equity Factor Rotation ETF
DYNF
$41.8B
| $9.79K | ﹤0.01% |
+144
| New | +$9.37K |
|
7704
CALL
INmune Bio
INMB
$67.7M
| $9.78K | ﹤0.01% |
6,000
+1,800
| +43% | +$2.49K |
|
7705
iShares US Oil Equipment & Services ETF
IEZ
$391M
| $9.76K | ﹤0.01% |
+363
| New | +$10.9K |
|
7706
Lantern Pharma
LTRN
$24.4M
| $9.74K | ﹤0.01% |
2,337
+2,230
| +2,084% | +$6.54K |
|
7707
CALL
Diamondrock Hospitality Co
DRH
$2.47B
| $9.74K | ﹤0.01% |
+800
| New | +$8.71K |
|
7708
Impinj
PI
$5.27B
| $9.74K | ﹤0.01% |
+68
| New | +$8.87K |
|
|
MVO
7709
CALL
DELISTED
MV Oil Trust
MVO
| $9.73K | ﹤0.01% |
5,500
+2,600
| +90% | +$5.42K |
|
7710
PUT
Hanmi Financial
HAFC
$951M
| $9.72K | ﹤0.01% |
300
| – | – |
|
7711
CALL
Workiva
WK
$4.17B
| $9.7K | ﹤0.01% |
200
-22,400
| -99% | -$1.15M |
|
7712
CALL
Natural Resource Partners
NRP
$1.51B
| $9.7K | ﹤0.01% |
100
-800
| -89% | -$87.8K |
|
7713
CALL
Zentalis Pharmaceuticals
ZNTL
$378M
| $9.7K | ﹤0.01% |
2,000
-100
| -5% | -$399 |
|
7714
CALL
Bankunited
BKU
$3.3B
| $9.69K | ﹤0.01% |
200
-100
| -33% | -$4.7K |
|
|
UPB
7715
PUT
Upstream Bio Inc
UPB
$329M
| $9.69K | ﹤0.01% |
1,400
-14,400
| -91% | -$121K |
|
7716
CALL
OPAL Fuels
OPAL
$61M
| $9.68K | ﹤0.01% |
4,400
-2,200
| -33% | -$4.83K |
|
7717
Direxion Daily 7-10 Year Treasury Bull 3X ETF
TYD
$27.9M
| $9.66K | ﹤0.01% |
407
-4,792
| -92% | -$115K |
|
7718
CALL
InfuSystem Holdings
INFU
$244M
| $9.65K | ﹤0.01% |
1,000
-3,200
| -76% | -$30.3K |
|
7719
CALL
American Century Diversified Corporate Bond ETF
KORP
$929M
| $9.65K | ﹤0.01% |
100
-700
| -88% | -$32.7K |
|
7720
Ducommun
DCO
$2.54B
| $9.63K | ﹤0.01% |
+52
| New | +$7.72K |
|
7721
PUT
Nano X Imaging
NNOX
$65.2M
| $9.63K | ﹤0.01% |
8,300
-8,200
| -50% | -$15.4K |
|
7722
BCB Bancorp
BCBP
$157M
| $9.63K | ﹤0.01% |
+898
| New | +$9.16K |
|
7723
PUT
BGC Group
BGC
$5.79B
| $9.62K | ﹤0.01% |
900
-800
| -47% | -$8.95K |
|
7724
CALL
Chefs' Warehouse
CHEF
$4.67B
| $9.61K | ﹤0.01% |
+100
| New | +$7.74K |
|
7725
PUT
Dole
DOLE
$1.32B
| $9.6K | ﹤0.01% |
700
| – | – |
|
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.