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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
QUMU
8326
PUT
DELISTED
Qumu Corp.
QUMU
| $27K | ﹤0.01% |
+9,600
| New | +$47.2K |
|
|
TUEM
8327
CALL
DELISTED
Tuesday Morning Corp
TUEM
| $27K | ﹤0.01% |
+203
| New | +$27.1K |
|
|
IO
8328
PUT
DELISTED
ION Geophysical Corporation
IO
| $27K | ﹤0.01% |
+13,300
| New | +$28.6K |
|
8329
PUT
Citi Trends
CTRN
$543M
| $26K | ﹤0.01% |
300
+296
| +7,400% | +$27.2K |
|
8330
Acquirers Small and Micro Deep Value ETF
DEEP
$27.8M
| $26K | ﹤0.01% |
+752
| New | +$26.6K |
|
8331
Future Fuel
FF
$203M
| $26K | ﹤0.01% |
+2,807
| New | +$33.9K |
|
8332
PUT
Fortis
FTS
$29.7B
| $26K | ﹤0.01% |
600
+581
| +3,058% | +$26.2K |
|
8333
CALL
Genworth Financial
GNW
$3.79B
| $26K | ﹤0.01% |
6,900
+6,317
| +1,084% | +$25.2K |
|
8334
CALL
Inogen
INGN
$171M
| $26K | ﹤0.01% |
400
+397
| +13,233% | +$25.1K |
|
8335
iShares MSCI Intl Quality Factor ETF
IQLT
$13.6B
| $26K | ﹤0.01% |
+688
| New | +$26.6K |
|
8336
iShares US Energy ETF
IYE
$1.71B
| $26K | ﹤0.01% |
902
-200
| -18% | -$5.57K |
|
8337
CALL
Maximus
MMS
$3.2B
| $26K | ﹤0.01% |
300
+296
| +7,400% | +$27.1K |
|
8338
NBT Bancorp
NBTB
$2.73B
| $26K | ﹤0.01% |
+747
| New | +$28.9K |
|
8339
PUT
Red Robin
RRGB
$136M
| $26K | ﹤0.01% |
800
+684
| +590% | +$23.3K |
|
8340
PUT
Seer Inc
SEER
$108M
| $26K | ﹤0.01% |
800
+775
| +3,100% | +$30.6K |
|
|
SY
8341
So-Young International
SY
$198M
| $26K | ﹤0.01% |
2,792
-2,731
| -49% | -$25.2K |
|
8342
Tucows
TCX
$95.5M
| $26K | ﹤0.01% |
334
-1,113
| -77% | -$88.2K |
|
|
TRVG
8343
CALL
trivago
TRVG
$382M
| $26K | ﹤0.01% |
1,600
+1,594
| +26,567% | +$29.4K |
|
8344
Mammoth Energy Services
TUSK
$131M
| $26K | ﹤0.01% |
5,691
+125
| +2% | +$515 |
|
8345
CALL
Vanguard S&P 500 Growth ETF
VOOG
$25.3B
| $26K | ﹤0.01% |
600
+594
| +9,900% | +$24.7K |
|
|
8346
PUT
Vanguard S&P 500 Growth ETF
VOOG
$25.3B
| $26K | ﹤0.01% |
600
+576
| +2,400% | +$24K |
|
8347
CALL
Varex Imaging
VREX
$463M
| $26K | ﹤0.01% |
1,000
+995
| +19,900% | +$24.4K |
|
|
ENLC
8348
DELISTED
ENLINK MIDSTREAM, LLC
ENLC
| $26K | ﹤0.01% |
4,161
-9,877
| -70% | -$50.6K |
|
|
VIA
8349
CALL
DELISTED
Via Renewables, Inc. Class A Common Stock
VIA
| $26K | ﹤0.01% |
460
+459
| +45,900% | +$24.5K |
|
|
SCTL
8350
CALL
DELISTED
Societal CDMO, Inc. Common Stock
SCTL
| $26K | ﹤0.01% |
11,400
+11,370
| +37,900% | +$28.9K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.