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 | |
|---|---|---|---|---|---|---|
|
PMT
4176
PUT
PennyMac Mortgage Investment
PMT
$854M
| $499K | ﹤0.01% |
23,700
+23,515
| +12,711% | +$470K |
|
4177
CALL
Ubiquiti
UI
$32.4B
| $499K | ﹤0.01% |
1,600
+1,578
| +7,173% | +$462K |
|
|
ZH
4178
Zhihu
ZH
$281M
| $499K | ﹤0.01% |
+6,142
| New | +$351K |
|
|
CNR
4179
PUT
DELISTED
Cornerstone Building Brands, Inc.
CNR
| $499K | ﹤0.01% |
+27,500
| New | +$443K |
|
|
PAE
4180
CALL
DELISTED
PAE Incorporated Class A Common Stock
PAE
| $499K | ﹤0.01% |
56,100
+55,395
| +7,857% | +$476K |
|
4181
PUT
Archrock
AROC
$6.19B
| $498K | ﹤0.01% |
56,000
+55,563
| +12,715% | +$518K |
|
4182
First Trust Global Wind Energy ETF
FAN
$272M
| $498K | ﹤0.01% |
23,182
+21,247
| +1,098% | +$463K |
|
4183
CALL
Gen Digital
GEN
$16.5B
| $498K | ﹤0.01% |
18,300
+17,924
| +4,767% | +$446K |
|
4184
Icon
ICLR
$13.9B
| $498K | ﹤0.01% |
2,413
+2,338
| +3,117% | +$505K |
|
|
DS
4185
PUT
DELISTED
Drive Shack Inc.
DS
| $498K | ﹤0.01% |
+150,500
| New | +$482K |
|
4186
PUT
Evolus
EOLS
$410M
| $497K | ﹤0.01% |
39,300
+39,115
| +21,143% | +$430K |
|
|
AEVA
4187
PUT
Aeva Technologies
AEVA
$1B
| $496K | ﹤0.01% |
9,400
+9,351
| +19,084% | +$472K |
|
4188
CubeSmart
CUBE
$9.62B
| $496K | ﹤0.01% |
10,725
+10,666
| +18,078% | +$460K |
|
4189
PUT
Textron
TXT
$15.6B
| $495K | ﹤0.01% |
7,200
+7,114
| +8,272% | +$460K |
|
4190
PUT
Iovance Biotherapeutics
IOVA
$2.1B
| $494K | ﹤0.01% |
+19,000
| New | +$494K |
|
4191
PUT
Prestige Consumer Healthcare
PBH
$2.45B
| $494K | ﹤0.01% |
+9,500
| New | +$456K |
|
4192
J.M. Smucker
SJM
$13.2B
| $494K | ﹤0.01% |
+3,819
| New | +$507K |
|
|
SOGP
4193
PUT
Sound Group
SOGP
$51.3M
| $494K | ﹤0.01% |
6,740
+6,725
| +44,833% | +$431K |
|
|
DOC
4194
CALL
DELISTED
PHYSICIANS REALTY TRUST
DOC
| $493K | ﹤0.01% |
26,700
+26,473
| +11,662% | +$492K |
|
4195
CALL
Kura Oncology
KURA
$826M
| $492K | ﹤0.01% |
23,600
+23,522
| +30,156% | +$584K |
|
4196
PUT
Leggett & Platt
LEG
$1.47B
| $492K | ﹤0.01% |
9,500
+8,953
| +1,637% | +$466K |
|
4197
CALL
Par Pacific Holdings
PARR
$3.97B
| $492K | ﹤0.01% |
29,300
+29,163
| +21,287% | +$438K |
|
4198
CALL
Ameris Bancorp
ABCB
$5.9B
| $491K | ﹤0.01% |
9,700
+9,604
| +10,004% | +$516K |
|
4199
PUT
Dolby
DLB
$4.97B
| $491K | ﹤0.01% |
5,000
+4,867
| +3,659% | +$481K |
|
4200
CALL
Lisata Therapeutics
LSTA
$10.6M
| $491K | ﹤0.01% |
20,340
+20,093
| +8,135% | +$476K |
|
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.