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 | |
|---|---|---|---|---|---|---|
1326
PUT
Illinois Tool Works
ITW
$81.4B
| $4.27M | ﹤0.01% |
19,100
+19,047
| +35,938% | +$4.36M |
|
1327
PUT
Corsair Gaming
CRSR
$1.05B
| $4.27M | ﹤0.01% |
128,200
+127,503
| +18,293% | +$4.19M |
|
1328
CALL
Bionano Genomics
BNGO
$12.7M
| $4.26M | ﹤0.01% |
970
+967
| +32,233% | +$3.82M |
|
1329
PagSeguro Digital
PAGS
$2.57B
| $4.26M | ﹤0.01% |
76,212
+48,151
| +172% | +$2.32M |
|
1330
PUT
Antero Resources
AR
$10.9B
| $4.26M | ﹤0.01% |
283,200
+280,442
| +10,168% | +$3.29M |
|
|
ME
1331
CALL
DELISTED
23andMe Holding Co
ME
| $4.26M | ﹤0.01% |
18,205
+17,937
| +6,693% | +$3.73M |
|
1332
CALL
Magnite
MGNI
$2.65B
| $4.25M | ﹤0.01% |
125,500
+124,049
| +8,549% | +$4.2M |
|
1333
PUT
Restaurant Brands International
QSR
$25.1B
| $4.23M | ﹤0.01% |
65,700
+65,225
| +13,732% | +$4.39M |
|
|
AMRS
1334
PUT
DELISTED
Amyris Inc.
AMRS
| $4.23M | ﹤0.01% |
+258,600
| New | +$3.86M |
|
|
LEV
1335
CALL
DELISTED
The Lion Electric Company
LEV
| $4.23M | ﹤0.01% |
+217,700
| New | +$4.08M |
|
|
FLNA
1336
Filana Therapeutics
FLNA
$43M
| $4.23M | ﹤0.01% |
49,468
+41,855
| +550% | +$2.24M |
|
1337
CALL
Pan American Silver
PAAS
$18.6B
| $4.22M | ﹤0.01% |
147,900
+147,091
| +18,182% | +$4.74M |
|
1338
CALL
Hasbro
HAS
$12.6B
| $4.21M | ﹤0.01% |
44,600
+44,137
| +9,533% | +$4.24M |
|
|
WRK
1339
PUT
DELISTED
WestRock Company
WRK
| $4.21M | ﹤0.01% |
79,200
+78,705
| +15,900% | +$4.41M |
|
1340
CALL
Joby Aviation
JOBY
$6.82B
| $4.21M | ﹤0.01% |
421,900
+417,462
| +9,407% | +$4.17M |
|
1341
CALL
Fox Class B
FOX
$20.7B
| $4.21M | ﹤0.01% |
113,400
+112,194
| +9,303% | +$4.06M |
|
1342
PUT
AGNC Investment
AGNC
$12.3B
| $4.21M | ﹤0.01% |
249,000
+248,057
| +26,305% | +$4.41M |
|
1343
CALL
Check Point Software Technologies
CHKP
$13.3B
| $4.2M | ﹤0.01% |
36,200
+35,887
| +11,465% | +$4.23M |
|
1344
PUT
Oneok
OKE
$58.7B
| $4.2M | ﹤0.01% |
75,400
+74,219
| +6,284% | +$3.95M |
|
1345
CALL
ACM Research
ACMR
$5.83B
| $4.19M | ﹤0.01% |
123,000
+122,904
| +128,025% | +$3.38M |
|
1346
CALL
FuelCell Energy
FCEL
$1.7B
| $4.19M | ﹤0.01% |
15,687
+15,533
| +10,086% | +$4.54M |
|
1347
Sunrun
RUN
$2.37B
| $4.19M | ﹤0.01% |
75,048
+52,324
| +230% | +$2.53M |
|
1348
CALL
Edwards Lifesciences
EW
$47.6B
| $4.18M | ﹤0.01% |
40,400
+40,112
| +13,928% | +$3.78M |
|
|
ABMD
1349
CALL
DELISTED
Abiomed Inc
ABMD
| $4.18M | ﹤0.01% |
13,400
+13,282
| +11,256% | +$4.07M |
|
1350
PUT
Southern Copper
SCCO
$141B
| $4.17M | ﹤0.01% |
69,901
+69,512
| +17,869% | +$4.52M |
|
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.