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 | |
|---|---|---|---|---|---|---|
6601
Baytex Energy
BTE
$3.4B
| $36K | ﹤0.01% |
9,004
-7,138
| -44% | -$33K |
|
|
ONC
6602
BeOne Medicines Ltd
ONC
$40.5B
| $35.9K | ﹤0.01% |
+126
| New | +$37.1K |
|
6603
Gaotu Techedu
GOTU
$517M
| $35.9K | ﹤0.01% |
21,624
-26,079
| -55% | -$47.4K |
|
6604
Invesco China Technology ETF
CQQQ
$3B
| $35.8K | ﹤0.01% |
628
+320
| +104% | +$16.5K |
|
|
MAZE
6605
PUT
Maze Therapeutics
MAZE
$1.46B
| $35.8K | ﹤0.01% |
1,200
-200
| -14% | -$5.24K |
|
6606
CALL
Penske Automotive Group
PAG
$14.4B
| $35.8K | ﹤0.01% |
200
-20,300
| -99% | -$3.39M |
|
|
AAMI
6607
CALL
Acadian Asset Management
AAMI
$3.32B
| $35.8K | ﹤0.01% |
+500
| New | +$34.8K |
|
6608
PUT
Navient
NAVI
$903M
| $35.7K | ﹤0.01% |
4,200
-4,000
| -49% | -$33.6K |
|
|
BRCB
6609
Black Rock Coffee Bar Inc
BRCB
$213M
| $35.6K | ﹤0.01% |
+4,300
| New | +$42.9K |
|
6610
Roundhill S&P 500 0DTE Covered Call Strategy ETF
XDTE
$339M
| $35.6K | ﹤0.01% |
912
-1,243
| -58% | -$48.4K |
|
6611
Invesco California AMT-Free Municipal Bond ETF
PWZ
$1.2B
| $35.6K | ﹤0.01% |
1,454
-137
| -9% | -$3.32K |
|
|
GLNK
6612
Grayscale Chainlink Trust ETF
GLNK
$122M
| $35.6K | ﹤0.01% |
5,563
+983
| +21% | +$7.78K |
|
6613
Encompass Health
EHC
$12B
| $35.6K | ﹤0.01% |
352
-758
| -68% | -$78.5K |
|
|
GRSD
6614
CALL
Grandstand Ltd
GRSD
$67.6M
| $35.5K | ﹤0.01% |
18,700
-38,900
| -68% | -$121K |
|
6615
CALL
OptimizeRx
OPRX
$148M
| $35.5K | ﹤0.01% |
6,200
-38,500
| -86% | -$221K |
|
6616
PUT
Provident Financial Services
PFS
$3.09B
| $35.5K | ﹤0.01% |
1,500
+500
| +50% | +$11.2K |
|
6617
CALL
GATX Corp
GATX
$6.29B
| $35.4K | ﹤0.01% |
+200
| New | +$36.4K |
|
|
SION
6618
CALL
Sionna Therapeutics
SION
$325M
| $35.2K | ﹤0.01% |
+800
| New | +$32K |
|
|
FITE
6619
State Street SPDR S&P Kensho Future Security ETF
FITE
$146M
| $35.2K | ﹤0.01% |
+313
| New | +$31.7K |
|
6620
PUT
Quantum-Si Incorporated
QSI
$168M
| $35.1K | ﹤0.01% |
39,700
-34,200
| -46% | -$32.6K |
|
6621
Intapp
INTA
$3.19B
| $35.1K | ﹤0.01% |
1,393
-8,041
| -85% | -$183K |
|
6622
PUT
Telecom Argentina
TEO
$5.61B
| $35.1K | ﹤0.01% |
2,700
+2,600
| +2,600% | +$32.7K |
|
6623
CALL
Cineverse
CNVS
$54.9M
| $35K | ﹤0.01% |
11,800
-13,100
| -53% | -$33.7K |
|
|
HELP
6624
PUT
Cybin Inc
HELP
$893M
| $35K | ﹤0.01% |
5,300
-3,700
| -41% | -$18.5K |
|
6625
CALL
ESCO Technologies
ESE
$7.1B
| $35K | ﹤0.01% |
100
-500
| -83% | -$156K |
|
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.