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 | |
|---|---|---|---|---|---|---|---|
8351
CALL
WisdomTree High Income Laddered Municipal Fund
WTMY
$4.88M
| $3.62K | ﹤0.01% |
100
-4,200
| -98% | -$106K |
2025 Q2
4 quarters
|
|
8352
CALL
Pyxis Oncology
PYXS
$143M
| $3.61K | ﹤0.01% |
1,200
-26,500
| -96% | -$50.7K |
2025 Q3
3 quarters
|
|
8353
PUT
Powerus Corporation Common Stock
PUSA
$264M
| $3.59K | ﹤0.01% |
+900
| New | +$3.77K |
2026 Q2
0 quarters
|
|
8354
Fidelity Enhanced Large Cap Growth ETF
FELG
$5.53B
| $3.59K | ﹤0.01% |
82
+34
| +71% | +$1.45K |
2025 Q3
3 quarters
|
|
8355
Sprott Gold Miners ETF
SGDM
$602M
| $3.58K | ﹤0.01% |
57
-1,480
| -96% | -$108K |
2025 Q1
5 quarters
|
|
8356
CALL
Mama's Creations
MAMA
$626M
| $3.57K | ﹤0.01% |
200
-400
| -67% | -$6.06K |
2023 Q4
10 quarters
|
|
8357
CALL
Barrett Business Services
BBSI
$795M
| $3.55K | ﹤0.01% |
100
-100
| -50% | -$3.14K |
2026 Q1
1 quarter
|
|
8358
PUT
InvenTrust Properties
IVT
$2.35B
| $3.54K | ﹤0.01% |
+100
| New | +$3.28K |
2026 Q2
0 quarters
|
|
8359
VanEck Inflation Allocation ETF
RAAX
$1.38B
| $3.53K | ﹤0.01% |
89
-22,544
| -100% | -$929K |
2026 Q1
1 quarter
|
|
|
WMCR
8360
PUT
DELISTED
Invesco Wilshire Micro-Cap ETF
WMCR
| $3.53K | ﹤0.01% |
100
-100
| -50% | -$3.53K |
2026 Q1
1 quarter
|
|
8361
Luxfer Holdings
LXFR
$465M
| $3.52K | ﹤0.01% |
+195
| New | +$3.04K |
2026 Q2
0 quarters
|
|
8362
PUT
Nomura Holdings
NMR
$26.4B
| $3.51K | ﹤0.01% |
400
+100
| +33% | +$832 |
2025 Q1
5 quarters
|
|
8363
iShares MSCI Europe Financials ETF
EUFN
$3.18B
| $3.51K | ﹤0.01% |
90
-16,658
| -99% | -$630K |
2025 Q4
2 quarters
|
|
8364
CALL
Conduent
CNDT
$232M
| $3.5K | ﹤0.01% |
2,400
-4,400
| -65% | -$6.83K |
2017 Q1
37 quarters
|
|
|
FFAI
8365
PUT
Faraday Future Intelligent Electric
FFAI
$3.93M
| $3.49K | ﹤0.01% |
101
+48
| +91% | +$2.37K |
2026 Q1
1 quarter
|
|
8366
CALL
ProFrac Holding
ACDC
$703M
| $3.49K | ﹤0.01% |
600
-17,200
| -97% | -$116K |
2022 Q4
14 quarters
|
|
8367
CALL
First Bancorp
FNLC
$408M
| $3.48K | ﹤0.01% |
100
-100
| -50% | -$2.97K |
2025 Q4
2 quarters
|
|
8368
PUT
Dorian LPG
LPG
$2.2B
| $3.48K | ﹤0.01% |
100
| – | – |
2019 Q2
28 quarters
|
|
8369
Direxion Daily AMZN Bear 1X ETF
AMZD
$15.6M
| $3.48K | ﹤0.01% |
+368
| New | +$3.36K |
2026 Q2
0 quarters
|
|
8370
GraniteShares 2x Short SpaceX Daily ETF
SNK
$20.3M
| $3.46K | ﹤0.01% |
+205
| New | +$3.75K |
2026 Q2
0 quarters
|
|
8371
CALL
Tectonic Therapeutic
TECX
$412M
| $3.44K | ﹤0.01% |
100
-3,600
| -97% | -$106K |
2025 Q2
4 quarters
|
|
8372
PUT
ThredUp
TDUP
$306M
| $3.42K | ﹤0.01% |
500
-1,500
| -75% | -$7.02K |
2025 Q1
5 quarters
|
|
8373
PUT
Suburban Propane Partners
SPH
$1.18B
| $3.42K | ﹤0.01% |
200
-1,500
| -88% | -$28.7K |
2021 Q1
21 quarters
|
|
8374
CALL
Hain Celestial
HAIN
$14.3M
| $3.42K | ﹤0.01% |
6,100
+1,200
| +24% | +$890 |
2016 Q1
41 quarters
|
|
8375
CALL
Ibotta
IBTA
$985M
| $3.42K | ﹤0.01% |
100
-300
| -75% | -$10K |
2024 Q4
6 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.