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 | |
|---|---|---|---|---|---|---|
1826
CALL
Hyliion Holdings
HYLN
$663M
| $2.62M | ﹤0.01% |
224,800
+222,036
| +8,033% | +$2.32M |
|
|
ORGN
1827
CALL
DELISTED
Origin Materials
ORGN
| $2.62M | ﹤0.01% |
10,633
+10,448
| +5,648% | +$3.11M |
|
1828
CALL
ResMed
RMD
$28.3B
| $2.61M | ﹤0.01% |
10,600
+10,512
| +11,945% | +$2.21M |
|
1829
PUT
Elanco Animal Health
ELAN
$12.4B
| $2.61M | ﹤0.01% |
75,200
+74,016
| +6,251% | +$2.44M |
|
1830
Direxion Daily Semiconductor Bull 3X ETF
SOXL
$18.7B
| $2.61M | ﹤0.01% |
58,537
+6,777
| +13% | +$261K |
|
1831
CALL
Ralph Lauren
RL
$22.2B
| $2.6M | ﹤0.01% |
22,100
+21,799
| +7,242% | +$2.73M |
|
1832
PUT
Stanley Black & Decker
SWK
$14.2B
| $2.6M | ﹤0.01% |
12,700
+12,459
| +5,170% | +$2.58M |
|
1833
CALL
Spectrum Brands
SPB
$2.04B
| $2.6M | ﹤0.01% |
30,600
+30,575
| +122,300% | +$2.7M |
|
1834
O'Reilly Automotive
ORLY
$72.4B
| $2.6M | ﹤0.01% |
68,910
+49,260
| +251% | +$1.77M |
|
|
LX
1835
PUT
LexinFintech Holdings
LX
$244M
| $2.6M | ﹤0.01% |
212,200
+211,470
| +28,968% | +$2.14M |
|
1836
BRC Group Holdings
RILY
$277M
| $2.6M | ﹤0.01% |
34,425
+19,537
| +131% | +$1.37M |
|
1837
CALL
Illinois Tool Works
ITW
$81.4B
| $2.59M | ﹤0.01% |
11,600
+11,137
| +2,405% | +$2.55M |
|
1838
PUT
Vulcan Materials
VMC
$36.3B
| $2.59M | ﹤0.01% |
14,900
+14,715
| +7,954% | +$2.63M |
|
1839
Vipshop
VIPS
$6.84B
| $2.59M | ﹤0.01% |
129,121
+126,598
| +5,018% | +$3.18M |
|
1840
Alnylam Pharmaceuticals
ALNY
$36.3B
| $2.59M | ﹤0.01% |
15,284
+898
| +6% | +$132K |
|
1841
CALL
Hydrofarm Holdings
HYFM
$3.13M
| $2.58M | ﹤0.01% |
4,370
+4,350
| +21,750% | +$2.56M |
|
|
RADA
1842
PUT
DELISTED
Rada Electronic Industries Ltd
RADA
| $2.58M | ﹤0.01% |
212,000
+209,997
| +10,484% | +$2.58M |
|
1843
CALL
Teradata
TDC
$2.68B
| $2.58M | ﹤0.01% |
51,600
+50,814
| +6,465% | +$2.31M |
|
1844
PUT
Rockwell Automation
ROK
$51.4B
| $2.57M | ﹤0.01% |
9,000
+8,810
| +4,637% | +$2.38M |
|
1845
PUT
Sibanye-Stillwater
SBSW
$5.92B
| $2.57M | ﹤0.01% |
153,800
+152,763
| +14,731% | +$2.83M |
|
1846
FTAI Aviation
FTAI
$22.2B
| $2.57M | ﹤0.01% |
89,729
+37,569
| +72% | +$946K |
|
1847
PUT
Yum China
YUMC
$14.9B
| $2.57M | ﹤0.01% |
38,800
+38,499
| +12,790% | +$2.46M |
|
1848
PUT
Ambarella
AMBA
$2.99B
| $2.57M | ﹤0.01% |
24,100
+24,049
| +47,155% | +$2.38M |
|
|
ARVL
1849
CALL
DELISTED
Arrival Ordinary Shares
ARVL
| $2.57M | ﹤0.01% |
3,280
+3,272
| +40,900% | +$2.9M |
|
1850
CALL
Quince Therapeutics
QNCX
$17.5M
| $2.56M | ﹤0.01% |
242
+240
| +12,000% | +$2.01M |
|
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.