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 | |
|---|---|---|---|---|---|---|
|
CNCE
8151
PUT
DELISTED
Concert Pharmaceuticals, Inc.
CNCE
| $33K | ﹤0.01% |
7,900
+7,837
| +12,440% | +$33.2K |
|
|
AERI
8152
PUT
DELISTED
Aerie Pharmaceuticals
AERI
| $33K | ﹤0.01% |
2,100
+2,089
| +18,991% | +$35.8K |
|
|
AUTO
8153
DELISTED
AutoWeb, Inc. Common Stock
AUTO
| $33K | ﹤0.01% |
10,614
+3,703
| +54% | +$10.2K |
|
|
TUFN
8154
DELISTED
Tufin Software Technologies Ltd.
TUFN
| $33K | ﹤0.01% |
+3,635
| New | +$34.1K |
|
|
DZSI
8155
PUT
DELISTED
DZS Inc. Common Stock
DZSI
| $33K | ﹤0.01% |
1,600
+1,597
| +53,233% | +$27.7K |
|
|
ASA
8156
CALL
ASA Gold and Precious Metals
ASA
$944M
| $32K | ﹤0.01% |
1,500
+1,436
| +2,244% | +$32.5K |
|
8157
PUT
Avnet
AVT
$7.12B
| $32K | ﹤0.01% |
800
+581
| +265% | +$25K |
|
8158
Cars.com
CARS
$702M
| $32K | ﹤0.01% |
+2,291
| New | +$31.8K |
|
8159
PUT
Celularity
CELU
$22M
| $32K | ﹤0.01% |
7,860
+7,835
| +31,340% | +$794K |
|
8160
CALL
Calumet Specialty Products
CLMT
$3.62B
| $32K | ﹤0.01% |
4,700
+4,564
| +3,356% | +$28.1K |
|
8161
Invesco DB Precious Metals Fund
DBP
$235M
| $32K | ﹤0.01% |
654
+65
| +11% | +$3.29K |
|
8162
PUT
Donegal Group Class A
DGICA
$713M
| $32K | ﹤0.01% |
2,200
+2,180
| +10,900% | +$33.3K |
|
|
CHRN
8163
ChronoScale Holdings
CHRN
$2.84B
| $32K | ﹤0.01% |
393
-117
| -23% | -$9.87K |
|
8164
CALL
Essential Properties Realty Trust
EPRT
$6.94B
| $32K | ﹤0.01% |
1,200
+1,027
| +594% | +$26.7K |
|
8165
Eton Pharmaceutcials
ETON
$1.28B
| $32K | ﹤0.01% |
5,236
+4,136
| +376% | +$30.6K |
|
8166
PUT
Imunon
IMNN
$6.3M
| $32K | ﹤0.01% |
132
+128
| +3,200% | +$30.3K |
|
8167
Monro
MNRO
$537M
| $32K | ﹤0.01% |
+507
| New | +$33.5K |
|
8168
PUT
Ryanair
RYAAY
$30.9B
| $32K | ﹤0.01% |
750
+685
| +1,054% | +$30.9K |
|
|
SJT
8169
CALL
San Juan Basin Royalty Trust
SJT
$119M
| $32K | ﹤0.01% |
6,400
+6,251
| +4,195% | +$31.4K |
|
|
SOGP
8170
Sound Group
SOGP
$50.2M
| $32K | ﹤0.01% |
446
+93
| +26% | +$5.96K |
|
|
TEF
8171
PUT
DELISTED
Telefonica
TEF
| $32K | ﹤0.01% |
7,504
+7,405
| +7,480% | +$32K |
|
8172
CALL
Webster Financial
WBS
$12.5B
| $32K | ﹤0.01% |
600
+545
| +991% | +$30.2K |
|
8173
CALL
World Acceptance Corp
WRLD
$871M
| $32K | ﹤0.01% |
200
+190
| +1,900% | +$27.8K |
|
|
WSR
8174
PUT
DELISTED
Whitestone REIT
WSR
| $32K | ﹤0.01% |
3,900
+3,865
| +11,043% | +$34.7K |
|
8175
ProShares Ultra FTSE China 50 of PROSHARES TRUST
XPP
$9.32M
| $32K | ﹤0.01% |
465
+400
| +615% | +$28.1K |
|
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.