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 | |
|---|---|---|---|---|---|---|
5926
CALL
Everest Group
EG
$14.6B
| $71.4K | ﹤0.01% |
200
-3,300
| -94% | -$1.13M |
|
|
LB
5927
CALL
LandBridge Co
LB
$2.46B
| $71.3K | ﹤0.01% |
900
-9,500
| -91% | -$652K |
|
5928
CALL
Extreme Networks
EXTR
$2.83B
| $71.2K | ﹤0.01% |
2,200
+1,700
| +340% | +$41K |
|
|
KCOP
5929
Kurv Copper & Mining Enhanced Income ETF
KCOP
$36.1M
| $71K | ﹤0.01% |
+3,173
| New | +$75.7K |
|
|
ASM
5930
PUT
Avino Silver & Gold Mines
ASM
$1.25B
| $71K | ﹤0.01% |
11,200
+7,200
| +180% | +$48.6K |
|
5931
CALL
Aura Biosciences
AURA
$784M
| $71K | ﹤0.01% |
+10,000
| New | +$71.5K |
|
5932
CALL
Lifestance Health
LFST
$4.86B
| $70.7K | ﹤0.01% |
+6,600
| New | +$51K |
|
5933
ING
ING
$106B
| $70.7K | ﹤0.01% |
2,252
-15,355
| -87% | -$454K |
|
|
CEPO
5934
PUT
Cantor Equity Partners I
CEPO
$274M
| $70.6K | ﹤0.01% |
8,000
-1,000
| -11% | -$10.5K |
|
5935
Arrow Electronics
ARW
$11B
| $70.6K | ﹤0.01% |
+331
| New | +$66.1K |
|
5936
PUT
FNB Corp
FNB
$6.65B
| $70.6K | ﹤0.01% |
3,700
+2,800
| +311% | +$49.8K |
|
5937
PUT
SBA Communications
SBAC
$20.1B
| $70.6K | ﹤0.01% |
400
-900
| -69% | -$186K |
|
5938
CALL
WEX
WEX
$6.61B
| $70.5K | ﹤0.01% |
+500
| New | +$74.1K |
|
5939
Full House Resorts
FLL
$75.9M
| $70.2K | ﹤0.01% |
+25,176
| New | +$66.6K |
|
|
ECO
5940
CALL
Okeanis Eco Tankers
ECO
$2.79B
| $70.2K | ﹤0.01% |
+1,400
| New | +$73K |
|
5941
CALL
LGI Homes
LGIH
$1.28B
| $70K | ﹤0.01% |
1,100
+100
| +10% | +$4.78K |
|
5942
PUT
ESCO Technologies
ESE
$7.1B
| $70K | ﹤0.01% |
+200
| New | +$62.6K |
|
5943
Titan Machinery
TITN
$617M
| $70K | ﹤0.01% |
3,313
+3,177
| +2,336% | +$65.1K |
|
5944
PUT
Glaukos
GKOS
$10.5B
| $69.9K | ﹤0.01% |
500
-3,000
| -86% | -$380K |
|
5945
CALL
Cartesian Therapeutics
RNAC
$280M
| $69.8K | ﹤0.01% |
6,700
+5,800
| +644% | +$43K |
|
5946
Nomad Foods
NOMD
$1.63B
| $69.8K | ﹤0.01% |
6,372
-3,564
| -36% | -$35.4K |
|
5947
PUT
Trinity Capital Inc
TRIN
$1.73B
| $69.8K | ﹤0.01% |
3,900
-36,700
| -90% | -$605K |
|
5948
CALL
Black Diamond Therapeutics
BDTX
$122M
| $69.7K | ﹤0.01% |
37,700
+31,500
| +508% | +$77K |
|
5949
Dimensional International Value ETF
DFIV
$22.5B
| $69.7K | ﹤0.01% |
1,290
+75
| +6% | +$4.12K |
|
|
REFI
5950
Chicago Atlantic Real Estate Finance
REFI
$281M
| $69.6K | ﹤0.01% |
6,497
-10,527
| -62% | -$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.