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 | |
|---|---|---|---|---|---|---|
2351
Interactive Brokers
IBKR
$40.9B
| $1.73M | ﹤0.01% |
105,572
+63,232
| +149% | +$1.09M |
|
2352
United States Natural Gas Fund
UNG
$470M
| $1.73M | ﹤0.01% |
33,156
-12,005
| -27% | -$513K |
|
2353
CALL
Encompass Health
EHC
$11.2B
| $1.73M | ﹤0.01% |
27,905
+27,773
| +21,040% | +$1.85M |
|
2354
Teva Pharmaceuticals
TEVA
$35.9B
| $1.73M | ﹤0.01% |
174,723
-19,172
| -10% | -$203K |
|
|
XONE
2355
PUT
DELISTED
The ExOne Company
XONE
| $1.73M | ﹤0.01% |
+79,900
| New | +$1.82M |
|
|
STKL
2356
CALL
DELISTED
SunOpta
STKL
| $1.73M | ﹤0.01% |
+141,200
| New | +$1.84M |
|
|
GOOS
2357
CALL
Canada Goose Holdings
GOOS
$868M
| $1.73M | ﹤0.01% |
39,500
+38,947
| +7,043% | +$1.59M |
|
2358
CALL
Jack in the Box
JACK
$278M
| $1.73M | ﹤0.01% |
15,500
+15,462
| +40,689% | +$1.81M |
|
|
CGC
2359
Canopy Growth
CGC
$375M
| $1.72M | ﹤0.01% |
7,132
+7,126
| +118,767% | +$1.82M |
|
|
CTLP
2360
CALL
DELISTED
Cantaloupe
CTLP
| $1.72M | ﹤0.01% |
145,400
+145,343
| +254,988% | +$1.7M |
|
|
MAG
2361
PUT
DELISTED
MAG Silver
MAG
| $1.72M | ﹤0.01% |
+82,400
| New | +$1.63M |
|
|
GRMN
2362
CALL
Garmin
GRMN
$46.9B
| $1.72M | ﹤0.01% |
11,900
+11,749
| +7,781% | +$1.65M |
|
2363
Lightspeed Commerce
LSPD
$1.3B
| $1.72M | ﹤0.01% |
20,588
+5,453
| +36% | +$383K |
|
2364
PUT
FMC
FMC
$1.42B
| $1.72M | ﹤0.01% |
15,900
+15,792
| +14,622% | +$1.83M |
|
2365
CALL
Blue Owl Capital
OWL
$6.39B
| $1.72M | ﹤0.01% |
133,600
+132,271
| +9,953% | +$1.5M |
|
2366
PUT
Modine Manufacturing
MOD
$12.8B
| $1.72M | ﹤0.01% |
103,400
+103,080
| +32,213% | +$1.69M |
|
2367
Harley-Davidson
HOG
$2.68B
| $1.71M | ﹤0.01% |
37,406
-39,132
| -51% | -$1.82M |
|
2368
PUT
Moelis & Co
MC
$4.98B
| $1.71M | ﹤0.01% |
30,100
+30,088
| +250,733% | +$1.63M |
|
2369
Edwards Lifesciences
EW
$47.6B
| $1.71M | ﹤0.01% |
16,526
-601
| -4% | -$56.6K |
|
2370
PUT
Mohawk Industries
MHK
$6.9B
| $1.71M | ﹤0.01% |
8,900
+8,829
| +12,435% | +$1.8M |
|
2371
Vroom Inc
VRM
$36.9M
| $1.71M | ﹤0.01% |
511
+148
| +41% | +$503K |
|
2372
CALL
Hyatt Hotels
H
$17.6B
| $1.71M | ﹤0.01% |
22,000
+21,799
| +10,845% | +$1.76M |
|
|
ITCI
2373
CALL
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $1.71M | ﹤0.01% |
41,800
+41,749
| +81,861% | +$1.54M |
|
2374
PUT
Carrier Global
CARR
$57.2B
| $1.71M | ﹤0.01% |
35,100
+34,953
| +23,778% | +$1.56M |
|
|
PENG
2375
Penguin Solutions Inc
PENG
$2.76B
| $1.7M | ﹤0.01% |
71,486
+70,728
| +9,331% | +$1.7M |
|
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.