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 | |
|---|---|---|---|---|---|---|
7676
Veracyte
VCYT
$3.42B
| $10.2K | ﹤0.01% |
174
-735
| -81% | -$30.8K |
|
7677
CALL
Precision BioSciences
DTIL
$206M
| $10.2K | ﹤0.01% |
+1,300
| New | +$9.15K |
|
7678
PUT
Franklin Bitcoin ETF
EZBC
$473M
| $10.2K | ﹤0.01% |
+300
| New | +$12.4K |
|
7679
PUT
Delek US
DK
$4.4B
| $10.2K | ﹤0.01% |
200
-800
| -80% | -$35.5K |
|
7680
CALL
Enliven Therapeutics
ELVN
$4.35B
| $10.2K | ﹤0.01% |
+200
| New | +$8.49K |
|
7681
PUT
Telesat
TSAT
$683M
| $10.1K | ﹤0.01% |
+200
| New | +$9.67K |
|
7682
Shore Bancshares
SHBI
$789M
| $10.1K | ﹤0.01% |
+440
| New | +$8.95K |
|
7683
CALL
Amphastar Pharmaceuticals
AMPH
$986M
| $10.1K | ﹤0.01% |
500
-13,500
| -96% | -$272K |
|
7684
CALL
Intapp
INTA
$3.19B
| $10.1K | ﹤0.01% |
400
-100
| -20% | -$2.28K |
|
|
PDM
7685
CALL
Piedmont Realty Trust
PDM
$1.21B
| $10.1K | ﹤0.01% |
+1,100
| New | +$9.07K |
|
7686
CALL
Bain Capital Specialty
BCSF
$767M
| $10K | ﹤0.01% |
800
-400
| -33% | -$5.22K |
|
7687
WhiteHorse Finance
WHF
$152M
| $10K | ﹤0.01% |
1,494
-85
| -5% | -$606 |
|
7688
PUT
Coca-Cola Europacific Partners
CCEP
$46.7B
| $10K | ﹤0.01% |
+100
| New | +$9.53K |
|
|
YSG
7689
Yatsen Holding
YSG
$250M
| $9.99K | ﹤0.01% |
3,153
+1,253
| +66% | +$3.79K |
|
7690
CALL
Select Water Solutions
WTTR
$2.59B
| $9.99K | ﹤0.01% |
500
-20,400
| -98% | -$357K |
|
7691
CION Investment
CION
$361M
| $9.97K | ﹤0.01% |
1,600
+175
| +12% | +$1.22K |
|
|
LOAN
7692
CALL
Manhattan Bridge Capital
LOAN
$46.6M
| $9.94K | ﹤0.01% |
+2,200
| New | +$9.62K |
|
7693
The 3D Printing ETF
PRNT
$62.6M
| $9.93K | ﹤0.01% |
404
-2,215
| -85% | -$52.5K |
|
7694
First Trust Nasdaq Food & Beverage ETF
FTXG
$18.3M
| $9.9K | ﹤0.01% |
+445
| New | +$9.9K |
|
7695
CALL
Tenaya Therapeutics
TNYA
$153M
| $9.9K | ﹤0.01% |
13,400
+3,800
| +40% | +$2.88K |
|
7696
CALL
TriNet
TNET
$3.17B
| $9.9K | ﹤0.01% |
200
-55,900
| -100% | -$2.4M |
|
|
NAGE
7697
CALL
Niagen Bioscience
NAGE
$251M
| $9.89K | ﹤0.01% |
3,100
-38,900
| -93% | -$158K |
|
7698
Direxion Daily MSFT Bull 2X ETF
MSFU
$617M
| $9.87K | ﹤0.01% |
447
-6,665
| -94% | -$180K |
|
7699
CALL
Benchmark Electronics
BHE
$2.61B
| $9.87K | ﹤0.01% |
+100
| New | +$7.98K |
|
|
7700
PUT
Benchmark Electronics
BHE
$2.61B
| $9.87K | ﹤0.01% |
+100
| New | +$7.98K |
|
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.