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 | |
|---|---|---|---|---|---|---|
4976
UWM Holdings
UWMC
$427M
| $162K | ﹤0.01% |
70,725
-67,821
| -49% | -$211K |
|
4977
ProShares Short Russell2000
RWM
$156M
| $162K | ﹤0.01% |
+12,186
| New | +$175K |
|
|
NEBX
4978
Tradr 2X Long NBIS Daily ETF
NEBX
$215M
| $162K | ﹤0.01% |
+2,756
| New | +$97.9K |
|
4979
CALL
Universal Corp
UVV
$1.04B
| $162K | ﹤0.01% |
3,100
-1,400
| -31% | -$74.6K |
|
|
ARIS
4980
PUT
Aris Mining
ARIS
$3.66B
| $161K | ﹤0.01% |
10,800
+5,000
| +86% | +$89.9K |
|
4981
PUT
Compass Diversified
CODI
$831M
| $161K | ﹤0.01% |
15,100
-6,300
| -29% | -$68.7K |
|
4982
CALL
Entergy
ETR
$47.7B
| $161K | ﹤0.01% |
1,400
-14,700
| -91% | -$1.66M |
|
4983
Distribution Solutions Group
DSGR
$1.62B
| $160K | ﹤0.01% |
5,866
-18,012
| -75% | -$492K |
|
4984
PUT
Arlo Technologies
ARLO
$1.34B
| $160K | ﹤0.01% |
11,900
+10,400
| +693% | +$141K |
|
4985
PUT
Enlight Renewable Energy
ENLT
$9.78B
| $160K | ﹤0.01% |
1,800
+1,400
| +350% | +$123K |
|
4986
PUT
Perion Network
PERI
$338M
| $160K | ﹤0.01% |
16,500
+100
| +0.6% | +$954 |
|
4987
PUT
LegalZoom.com
LZ
$951M
| $160K | ﹤0.01% |
26,100
+25,200
| +2,800% | +$155K |
|
4988
Full Truck Alliance
YMM
$8.58B
| $160K | ﹤0.01% |
19,698
+8,381
| +74% | +$71.3K |
|
4989
CALL
Helen of Troy
HELE
$656M
| $160K | ﹤0.01% |
5,500
-200
| -4% | -$4.73K |
|
4990
CALL
Kingstone Companies
KINS
$259M
| $160K | ﹤0.01% |
8,400
-27,000
| -76% | -$435K |
|
4991
CALL
Aspen Aerogels
ASPN
$433M
| $160K | ﹤0.01% |
25,200
+300
| +1% | +$1.47K |
|
4992
CALL
Alkami Technology
ALKT
$1.43B
| $159K | ﹤0.01% |
8,800
-3,300
| -27% | -$54.5K |
|
4993
GeneDx Holdings
WGS
$2.26B
| $159K | ﹤0.01% |
2,322
+2,020
| +669% | +$115K |
|
4994
PUT
Descartes Systems
DSGX
$6.8B
| $159K | ﹤0.01% |
2,300
+300
| +15% | +$21.4K |
|
4995
CALL
Unicycive Therapeutics
UNCY
$127M
| $159K | ﹤0.01% |
33,900
+3,700
| +12% | +$27.3K |
|
4996
CALL
Owens Corning
OC
$9.36B
| $159K | ﹤0.01% |
1,000
-16,000
| -94% | -$1.94M |
|
4997
PUT
Hyliion Holdings
HYLN
$716M
| $159K | ﹤0.01% |
30,500
+23,900
| +362% | +$99.4K |
|
4998
PUT
Medpace
MEDP
$17.4B
| $159K | ﹤0.01% |
300
+200
| +200% | +$92.3K |
|
4999
CALL
Archrock
AROC
$5.26B
| $159K | ﹤0.01% |
3,900
-1,300
| -25% | -$47.8K |
|
5000
CALL
Vita Coco
COCO
$3.27B
| $159K | ﹤0.01% |
2,400
-1,800
| -43% | -$121K |
|
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.