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 | |
|---|---|---|---|---|---|---|
5551
CALL
Cognyte Software
CGNT
$626M
| $99.2K | ﹤0.01% |
11,300
+4,600
| +69% | +$43.6K |
|
5552
Clarus
CLAR
$144M
| $99.2K | ﹤0.01% |
31,483
+18,414
| +141% | +$53K |
|
5553
PUT
American States Water
AWR
$3.51B
| $99.2K | ﹤0.01% |
1,200
+300
| +33% | +$23.3K |
|
5554
PUT
Equillium
EQ
$140M
| $98.9K | ﹤0.01% |
30,900
-15,900
| -34% | -$38.1K |
|
5555
PUT
ITT
ITT
$18.3B
| $98.9K | ﹤0.01% |
500
+100
| +25% | +$20.2K |
|
5556
Moog Inc Class A
MOG.A
$11.8B
| $98.8K | ﹤0.01% |
233
-19,634
| -99% | -$6.7M |
|
5557
CALL
TaskUs
TASK
$725M
| $98.7K | ﹤0.01% |
21,100
+5,900
| +39% | +$35.8K |
|
5558
PUT
Medifast
MED
$141M
| $98.7K | ﹤0.01% |
+9,300
| New | +$107K |
|
5559
CALL
Camping World
CWH
$444M
| $98.4K | ﹤0.01% |
12,900
-8,800
| -41% | -$63.8K |
|
|
DX
5560
PUT
Dynex Capital
DX
$3.2B
| $98.3K | ﹤0.01% |
7,500
-17,900
| -70% | -$235K |
|
5561
CMS Energy
CMS
$21.5B
| $98.3K | ﹤0.01% |
1,285
+181
| +16% | +$13.6K |
|
5562
Descartes Systems
DSGX
$6.76B
| $98.3K | ﹤0.01% |
1,419
+861
| +154% | +$61.5K |
|
5563
VanEck ChiNext Innovators ETF
CNXT
$103M
| $98.2K | ﹤0.01% |
1,573
+1,244
| +378% | +$67.8K |
|
|
APLX
5564
Tradr 2X Long APLD Daily ETF
APLX
$48.8M
| $98.1K | ﹤0.01% |
+4,750
| New | +$120K |
|
5565
PUT
Sixth Street Specialty
TSLX
$1.75B
| $97.9K | ﹤0.01% |
5,700
-1,700
| -23% | -$30.3K |
|
5566
CALL
Rigel Pharmaceuticals
RIGL
$909M
| $97.8K | ﹤0.01% |
2,500
-9,300
| -79% | -$287K |
|
5567
EnerSys
ENS
$6.56B
| $97.7K | ﹤0.01% |
418
+98
| +31% | +$21.3K |
|
5568
PUT
BlackSky Technology
BKSY
$839M
| $97.7K | ﹤0.01% |
3,500
+700
| +25% | +$25.3K |
|
5569
CALL
Pricesmart
PSMT
$5.37B
| $97.7K | ﹤0.01% |
500
-300
| -38% | -$50K |
|
5570
CALL
Spyre Therapeutics
SYRE
$7.85B
| $97.7K | ﹤0.01% |
+1,100
| New | +$80.3K |
|
5571
Amtech Systems
ASYS
$262M
| $97.6K | ﹤0.01% |
+4,230
| New | +$80.3K |
|
5572
CALL
Griffon
GFF
$4.51B
| $97.5K | ﹤0.01% |
+1,000
| New | +$87.2K |
|
5573
CALL
Cheniere Energy
CQP
$33.3B
| $97.5K | ﹤0.01% |
1,600
+200
| +14% | +$12.6K |
|
5574
ProShares Ultra Yen
YCL
$32.6M
| $97.4K | ﹤0.01% |
5,608
+2,870
| +105% | +$52K |
|
|
NKLR
5575
PUT
Terra Innovatum Global N.V.
NKLR
$582M
| $97.4K | ﹤0.01% |
19,800
+18,800
| +1,880% | +$106K |
|
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.