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 | |
|---|---|---|---|---|---|---|
|
CMRC
6426
CALL
Commerce.com Inc Series 1
CMRC
$213M
| $43.5K | ﹤0.01% |
14,700
-800
| -5% | -$2.29K |
|
6427
CALL
Bread Financial
BFH
$4.26B
| $43.3K | ﹤0.01% |
400
-900
| -69% | -$80.8K |
|
6428
CALL
Alector
ALEC
$275M
| $43.2K | ﹤0.01% |
21,500
-9,300
| -30% | -$19.9K |
|
|
NFLU
6429
T-Rex 2X Long NFLX Daily Target ETF
NFLU
$40.7M
| $43.2K | ﹤0.01% |
+2,617
| New | +$68.8K |
|
|
ALLW
6430
State Street Bridgewater All Weather ETF
ALLW
$1.75B
| $43.2K | ﹤0.01% |
+1,475
| New | +$43.8K |
|
6431
CALL
Natural Gas Services Group
NGS
$469M
| $43.1K | ﹤0.01% |
1,000
-800
| -44% | -$32.5K |
|
6432
PUT
Worthington Enterprises
WOR
$3.06B
| $43K | ﹤0.01% |
800
-2,100
| -72% | -$117K |
|
6433
PUT
Element Solutions
ESI
$8.78B
| $43K | ﹤0.01% |
900
+100
| +13% | +$4.15K |
|
6434
PUT
Trevi Therapeutics
TRVI
$2.46B
| $42.9K | ﹤0.01% |
2,300
-122,600
| -98% | -$1.78M |
|
6435
CALL
Spectrum Brands
SPB
$2.04B
| $42.9K | ﹤0.01% |
500
-3,300
| -87% | -$267K |
|
6436
PUT
Perma-Fix Environmental Services
PESI
$397M
| $42.9K | ﹤0.01% |
3,000
-10,100
| -77% | -$113K |
|
6437
Eagle Materials
EXP
$5.97B
| $42.8K | ﹤0.01% |
190
-286
| -60% | -$59.8K |
|
6438
Seanergy Maritime Holdings
SHIP
$410M
| $42.7K | ﹤0.01% |
3,183
-3,259
| -51% | -$49.1K |
|
6439
PUT
Cheniere Energy
CQP
$33.3B
| $42.7K | ﹤0.01% |
700
+200
| +40% | +$12.6K |
|
|
DHC
6440
Diversified Healthcare Trust
DHC
$1.82B
| $42.5K | ﹤0.01% |
4,571
+3,779
| +477% | +$31K |
|
|
KLC
6441
KinderCare Learning Companies
KLC
$316M
| $42.5K | ﹤0.01% |
+9,996
| New | +$36.9K |
|
6442
CALL
PDF Solutions
PDFS
$1.93B
| $42.5K | ﹤0.01% |
600
+400
| +200% | +$19.8K |
|
6443
Viant Technology
DSP
$289M
| $42.4K | ﹤0.01% |
+3,352
| New | +$37.8K |
|
6444
PUT
NovoCure
NVCR
$2.09B
| $42.4K | ﹤0.01% |
2,800
-26,000
| -90% | -$393K |
|
6445
PUT
Quest Diagnostics
DGX
$26.2B
| $42.4K | ﹤0.01% |
+200
| New | +$39.3K |
|
|
LX
6446
PUT
LexinFintech Holdings
LX
$145M
| $42.4K | ﹤0.01% |
21,500
-13,300
| -38% | -$28.3K |
|
6447
PUT
Arbe Robotics
ARBE
$81M
| $42.3K | ﹤0.01% |
51,000
+22,400
| +78% | +$19.3K |
|
6448
PUT
Enanta Pharmaceuticals
ENTA
$410M
| $42.3K | ﹤0.01% |
2,900
+700
| +32% | +$9.41K |
|
|
NXDR
6449
CALL
Nextdoor Holdings
NXDR
$867M
| $42.2K | ﹤0.01% |
18,600
-5,400
| -23% | -$10.1K |
|
6450
CALL
Oppenheimer Holdings
OPY
$1.32B
| $42.2K | ﹤0.01% |
400
+200
| +100% | +$20.4K |
|
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.