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 | |
|---|---|---|---|---|---|---|---|
9001
PUT
Accendra Health
ACH
$16.2M
| $342 | ﹤0.01% |
100
| – | – |
2023 Q3
11 quarters
|
|
9002
PCB Bancorp
PCB
$404M
| $340 | ﹤0.01% |
+12
| New | +$298 |
2026 Q2
0 quarters
|
|
9003
CALL
Permianville Royalty Trust
PVL
$59.7M
| $338 | ﹤0.01% |
200
-18,700
| -99% | -$34.9K |
2025 Q2
4 quarters
|
|
9004
Global X MSCI China Consumer Discretionary ETF
CHIQ
$97.6M
| $332 | ﹤0.01% |
21
+18
| +600% | +$340 |
2025 Q4
2 quarters
|
|
9005
PUT
Mercer International
MERC
$9.4M
| $330 | ﹤0.01% |
+500
| New | +$497 |
2026 Q2
0 quarters
|
|
9006
Cars.com
CARS
$584M
| $328 | ﹤0.01% |
30
-1,896
| -98% | -$19.3K |
2024 Q3
7 quarters
|
|
9007
PUT
Mammoth Energy Services
TUSK
$131M
| $325 | ﹤0.01% |
+100
| New | +$293 |
2026 Q2
0 quarters
|
|
9008
AppFolio
APPF
$7.7B
| $320 | ﹤0.01% |
+2
| New | +$319 |
2026 Q2
0 quarters
|
|
9009
PUT
DELISTED
Open Lending Corp
LPRO
| $311 | ﹤0.01% |
+100
| New | +$204 |
2026 Q2
0 quarters
|
|
9010
CALL
Gogo Inc
GOGO
$286M
| $310 | ﹤0.01% |
100
-4,000
| -98% | -$16.3K |
2021 Q2
20 quarters
|
|
9011
CALL
Southside Bancshares
SBSI
$943M
| $310 | ﹤0.01% |
+100
| New | +$3.31K |
2026 Q2
0 quarters
|
|
9012
Greystone Housing Impact Investors LP
GHI
$118M
| $301 | ﹤0.01% |
+52
| New | +$275 |
2026 Q2
0 quarters
|
|
9013
PUT
Pyxis Oncology
PYXS
$143M
| $301 | ﹤0.01% |
+100
| New | +$191 |
2026 Q2
0 quarters
|
|
9014
Westwood Salient Enhanced Midstream Income ETF
MDST
$306M
| $288 | ﹤0.01% |
+10
| New | +$289 |
2026 Q2
0 quarters
|
|
9015
Orrstown Financial Services
ORRF
$872M
| $285 | ﹤0.01% |
+7
| New | +$264 |
2026 Q2
0 quarters
|
|
9016
CALL
DELISTED
Northfield Bancorp
NFBK
| $284 | ﹤0.01% |
2,900
| – | – |
2026 Q1
1 quarter
|
|
9017
Turkcell
TKC
$4.16B
| $276 | ﹤0.01% |
47
-119
| -72% | -$729 |
2026 Q1
1 quarter
|
|
9018
Bioceres Crop Solutions
BIOX
$16.3M
| $271 | ﹤0.01% |
775
-44,611
| -98% | -$21K |
2026 Q1
1 quarter
|
|
9019
Camden National
CAC
$978M
| $271 | ﹤0.01% |
5
-8
| -62% | -$401 |
2026 Q1
1 quarter
|
|
9020
PUT
Televisa
TV
$1.26B
| $271 | ﹤0.01% |
100
| – | – |
2025 Q4
2 quarters
|
|
9021
iShares 5-10 Year Investment Grade Corporate Bond ETF
IGIB
$19.1B
| $265 | ﹤0.01% |
+5
| New | +$266 |
2026 Q2
0 quarters
|
|
9022
PUT
MediciNova
MNOV
$69.4M
| $264 | ﹤0.01% |
+200
| New | +$274 |
2026 Q2
0 quarters
|
|
9023
BayCom
BCML
$348M
| $263 | ﹤0.01% |
8
-54
| -87% | -$1.65K |
2026 Q1
1 quarter
|
|
9024
Schwab Fundamental International Large Company Index ETF
FNDF
$25.5B
| $263 | ﹤0.01% |
+5
| New | +$263 |
2026 Q2
0 quarters
|
|
9025
First Trust SkyBridge Crypto Industry and Digital Economy ETF
CRPT
$104M
| $261 | ﹤0.01% |
+23
| New | +$319 |
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.