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 | Held Since | |
|---|---|---|---|---|---|---|---|
8751
PUT
Connect Biopharma Holdings
CNTB
$47.2M
| $1.43K | ﹤0.01% |
600
-7,600
| -93% | -$18.4K |
2025 Q4
2 quarters
|
|
8752
PUT
Kandi Technologies Group
KNDI
$34.4M
| $1.43K | ﹤0.01% |
+200
| New | +$1.48K |
2026 Q2
0 quarters
|
|
8753
Five Point Holdings
FPH
$299M
| $1.42K | ﹤0.01% |
269
-550
| -67% | -$2.76K |
2024 Q3
7 quarters
|
|
8754
PUT
Nkarta
NKTX
$125M
| $1.42K | ﹤0.01% |
500
-800
| -62% | -$2.25K |
2023 Q4
10 quarters
|
|
8755
CALL
Sally Beauty Holdings
SBH
$1.61B
| $1.41K | ﹤0.01% |
+100
| New | +$1.35K |
2026 Q2
0 quarters
|
|
8756
PUT
Atea Pharmaceuticals
AVIR
$320M
| $1.4K | ﹤0.01% |
+300
| New | +$1.49K |
2026 Q2
0 quarters
|
|
8757
CALL
Manitowoc
MTW
$804M
| $1.39K | ﹤0.01% |
100
-2,100
| -95% | -$26.7K |
2021 Q2
20 quarters
|
|
8758
PUT
Standard Lithium
SLI
$363M
| $1.38K | ﹤0.01% |
500
-1,600
| -76% | -$5.82K |
2021 Q4
18 quarters
|
|
8759
PUT
KKR Real Estate Finance Trust
KREF
$329M
| $1.37K | ﹤0.01% |
+200
| New | +$1.32K |
2026 Q2
0 quarters
|
|
8760
PUT
BNB Standard Corporation Warrant
BNCWW
$30.2K
| $1.36K | ﹤0.01% |
500
+200
| +67% | +$5 |
2025 Q3
3 quarters
|
|
8761
Carlyle Secured Lending
CGBD
$700M
| $1.36K | ﹤0.01% |
129
-329
| -72% | -$3.66K |
2025 Q1
5 quarters
|
|
8762
CALL
Green Dot
GDOT
$699M
| $1.35K | ﹤0.01% |
100
| – | – |
2023 Q3
11 quarters
|
|
8763
Montauk Renewables
MNTK
$303M
| $1.35K | ﹤0.01% |
864
-4,051
| -82% | -$5.99K |
2026 Q1
1 quarter
|
|
8764
CALL
CI&T Inc
CINT
$403M
| $1.34K | ﹤0.01% |
400
-1,000
| -71% | -$4.03K |
2025 Q4
2 quarters
|
|
8765
PUT
Gilat Satellite Networks
GILT
$569M
| $1.33K | ﹤0.01% |
100
-700
| -88% | -$11.5K |
2026 Q1
1 quarter
|
|
8766
PUT
Evommune Inc
EVMN
$184M
| $1.33K | ﹤0.01% |
+100
| New | +$2.32K |
2026 Q2
0 quarters
|
|
8767
PUT
T-Rex 2X Long Bitcoin Daily Target ETF
BTCL
$35M
| $1.33K | ﹤0.01% |
200
-1,000
| -83% | -$16.8K |
2024 Q4
6 quarters
|
|
8768
Cosmos Holdings
COSM
$26.5M
| $1.32K | ﹤0.01% |
7,138
+3,335
| +88% | +$968 |
2023 Q2
12 quarters
|
|
8769
Global X SuperDividend US ETF
DIV
$771M
| $1.31K | ﹤0.01% |
+69
| New | +$1.32K |
2026 Q2
0 quarters
|
|
8770
ProShares Ultra NASDAQ Biotechnology
BIB
$93.1M
| $1.31K | ﹤0.01% |
13
-49
| -79% | -$4.12K |
2025 Q4
2 quarters
|
|
8771
Celularity
CELU
$31.5M
| $1.31K | ﹤0.01% |
2,188
+2,133
| +3,878% | +$2.05K |
2024 Q1
9 quarters
|
|
8772
Hudson Technologies
HDSN
$227M
| $1.3K | ﹤0.01% |
226
-660
| -74% | -$3.75K |
2025 Q2
4 quarters
|
|
8773
CALL
Clarivate
CLVT
$1.22B
| $1.3K | ﹤0.01% |
+600
| New | +$1.47K |
2026 Q2
0 quarters
|
|
8774
Protara Therapeutics
TARA
$138M
| $1.29K | ﹤0.01% |
339
-4,110
| -92% | -$19.5K |
2026 Q1
1 quarter
|
|
8775
PUT
Wrap Technologies
WRAP
$77.2M
| $1.29K | ﹤0.01% |
+1,000
| New | +$1.41K |
2026 Q2
0 quarters
|
|
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.