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 | |
|---|---|---|---|---|---|---|---|
7026
PUT
Nurix Therapeutics
NRIX
$2.77B
| $21.8K | ﹤0.01% |
900
| – | – |
2025 Q4
2 quarters
|
|
7027
CALL
Nature's Sunshine
NATR
$214M
| $21.8K | ﹤0.01% |
+1,000
| New | +$23.3K |
2026 Q2
0 quarters
|
|
7028
Rigel Pharmaceuticals
RIGL
$899M
| $21.8K | ﹤0.01% |
+556
| New | +$17.1K |
2026 Q2
0 quarters
|
|
7029
Global X MSCI Argentina ETF
ARGT
$691M
| $21.7K | ﹤0.01% |
238
-3,182
| -93% | -$296K |
2025 Q4
2 quarters
|
|
7030
Freedom 100 Emerging Markets ETF
FRDM
$3.29B
| $21.7K | ﹤0.01% |
298
-7,905
| -96% | -$528K |
2026 Q1
1 quarter
|
|
7031
PUT
HighPeak Energy
HPK
$1.46B
| $21.7K | ﹤0.01% |
3,100
+2,000
| +182% | +$13.8K |
2022 Q3
15 quarters
|
|
7032
Quanex
NX
$917M
| $21.7K | ﹤0.01% |
1,163
+513
| +79% | +$9.47K |
2026 Q1
1 quarter
|
|
7033
CALL
FirstCash
FCFS
$7.49B
| $21.6K | ﹤0.01% |
100
-1,400
| -93% | -$304K |
2025 Q3
3 quarters
|
|
7034
Pharvaris
PHVS
$2.21B
| $21.6K | ﹤0.01% |
624
-1,549
| -71% | -$46.9K |
2026 Q1
1 quarter
|
|
7035
First Internet Bancorp
INBK
$233M
| $21.6K | ﹤0.01% |
+776
| New | +$18.8K |
2026 Q2
0 quarters
|
|
7036
Capital Clean Energy Carriers
CCEC
$1.22B
| $21.6K | ﹤0.01% |
+1,010
| New | +$20.9K |
2026 Q2
0 quarters
|
|
7037
PUT
PayPay
PAYP
$10.2B
| $21.5K | ﹤0.01% |
+1,500
| New | +$27.6K |
2026 Q2
0 quarters
|
|
7038
CALL
AXIS Capital
AXS
$7.49B
| $21.5K | ﹤0.01% |
+200
| New | +$20.1K |
2026 Q2
0 quarters
|
|
7039
Innovator Deepwater Frontier Tech ETF
LOUP
$194M
| $21.5K | ﹤0.01% |
+218
| New | +$18.9K |
2026 Q2
0 quarters
|
|
7040
CALL
American Public Education
APEI
$893M
| $21.5K | ﹤0.01% |
400
-800
| -67% | -$44K |
2025 Q3
3 quarters
|
|
7041
PUT
Adaptive Biotechnologies
ADPT
$4.07B
| $21.4K | ﹤0.01% |
1,000
+700
| +233% | +$10.7K |
2026 Q1
1 quarter
|
|
7042
CALL
Yorkville Acquisition Corp
MCGA
$245M
| $21.4K | ﹤0.01% |
2,100
-12,600
| -86% | -$128K |
2025 Q4
2 quarters
|
|
7043
Merchants Bancorp
MBIN
$2.25B
| $21.4K | ﹤0.01% |
428
-302
| -41% | -$14.3K |
2025 Q2
4 quarters
|
|
7044
Defiance Daily Target 2x Long IREN ETF
IRE
$86.2M
| $21.4K | ﹤0.01% |
1,280
-1,559
| -55% | -$40.7K |
2025 Q4
2 quarters
|
|
7045
Five Star Bancorp
FSBC
$1.08B
| $21.3K | ﹤0.01% |
+438
| New | +$18.5K |
2026 Q2
0 quarters
|
|
7046
Purple Innovation
PRPL
$11.6M
| $21.3K | ﹤0.01% |
2,388
+516
| +28% | +$6.33K |
2024 Q4
6 quarters
|
|
7047
PUT
Reinsurance Group of America
RGA
$17.2B
| $21.3K | ﹤0.01% |
+100
| New | +$20.9K |
2026 Q2
0 quarters
|
|
7048
CALL
DELISTED
Forte Biosciences
FBRX
| $21.2K | ﹤0.01% |
1,000
-34,000
| -97% | -$806K |
2026 Q1
1 quarter
|
|
7049
CALL
Coca-Cola Femsa
KOF
$24.8B
| $21.2K | ﹤0.01% |
200
-8,100
| -98% | -$849K |
2019 Q2
28 quarters
|
|
7050
PUT
Prairie Operating Co
PROP
$43.9M
| $21.2K | ﹤0.01% |
29,400
-218,700
| -88% | -$236K |
2025 Q1
5 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.