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 | |
|---|---|---|---|---|---|---|
|
CDMO
5051
CALL
DELISTED
Avid Bioservices, Inc. Common Stock
CDMO
| $287K | ﹤0.01% |
11,200
+11,048
| +7,268% | +$236K |
|
|
EIGR
5052
CALL
DELISTED
Eiger BioPharmaceuticals, Inc.
EIGR
| $287K | ﹤0.01% |
1,127
+1,114
| +8,569% | +$278K |
|
5053
PUT
Alpha Pro Tech
APT
$50.7M
| $286K | ﹤0.01% |
33,400
+33,050
| +9,443% | +$288K |
|
|
FOLD
5054
DELISTED
Amicus Therapeutics
FOLD
| $286K | ﹤0.01% |
29,672
-125,105
| -81% | -$1.22M |
|
5055
iShares Russell Mid-Cap Growth ETF
IWP
$19.8B
| $286K | ﹤0.01% |
2,531
-456
| -15% | -$48.7K |
|
5056
PUT
Quince Therapeutics
QNCX
$22.5M
| $286K | ﹤0.01% |
+27
| New | +$226K |
|
|
VAPO
5057
DELISTED
Vapotherm, Inc. Common Stock
VAPO
| $286K | ﹤0.01% |
1,516
+1,313
| +647% | +$224K |
|
|
HBP
5058
CALL
DELISTED
Huttig Building Products, Inc.
HBP
| $286K | ﹤0.01% |
+49,600
| New | +$262K |
|
5059
CALL
Apogee Enterprises
APOG
$832M
| $285K | ﹤0.01% |
+7,000
| New | +$264K |
|
5060
PUT
BJ's Restaurants
BJRI
$1.56B
| $285K | ﹤0.01% |
5,800
+5,796
| +144,900% | +$320K |
|
5061
CALL
Ceragon Networks
CRNT
$197M
| $285K | ﹤0.01% |
75,700
+75,401
| +25,218% | +$267K |
|
5062
Direxion Daily Aerospace & Defense Bull 3X ETF
DFEN
$376M
| $285K | ﹤0.01% |
11,686
-18,364
| -61% | -$431K |
|
5063
PUT
PACCAR
PCAR
$70.4B
| $285K | ﹤0.01% |
4,800
+4,686
| +4,111% | +$287K |
|
5064
CALL
Texas Capital Bancshares
TCBI
$4.29B
| $285K | ﹤0.01% |
4,500
+4,490
| +44,900% | +$303K |
|
5065
West Pharmaceutical
WST
$23.9B
| $285K | ﹤0.01% |
794
+56
| +8% | +$18.5K |
|
|
QVCGA
5066
CALL
DELISTED
QVC Group Inc Series A
QVCGA
| $285K | ﹤0.01% |
450
+426
| +1,775% | +$273K |
|
5067
PUT
First Commonwealth Financial
FCF
$2.18B
| $284K | ﹤0.01% |
20,200
+19,920
| +7,114% | +$293K |
|
5068
CALL
Lantheus
LNTH
$6.58B
| $284K | ﹤0.01% |
10,300
+10,275
| +41,100% | +$236K |
|
5069
Rigel Pharmaceuticals
RIGL
$704M
| $284K | ﹤0.01% |
6,545
-2,921
| -31% | -$110K |
|
|
CMBT
5070
PUT
CMB.TECH NV
CMBT
$4.65B
| $284K | ﹤0.01% |
30,500
+29,788
| +4,184% | +$272K |
|
|
CHS
5071
PUT
DELISTED
Chicos FAS, Inc.
CHS
| $284K | ﹤0.01% |
43,300
+41,085
| +1,855% | +$177K |
|
5072
Applovin
APP
$136B
| $283K | ﹤0.01% |
+3,771
| New | +$260K |
|
5073
CALL
Beazer Homes USA
BZH
$891M
| $283K | ﹤0.01% |
14,700
+14,643
| +25,689% | +$322K |
|
|
CODX
5074
CALL
Co-Diagnostics
CODX
$5.75M
| $283K | ﹤0.01% |
1,147
+1,133
| +8,093% | +$291K |
|
|
CUK
5075
CALL
DELISTED
Carnival PLC
CUK
| $283K | ﹤0.01% |
12,200
+11,662
| +2,168% | +$280K |
|
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.