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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1851
United Parks & Resorts
PRKS
$2.11B
| $2.55M | ﹤0.01% |
49,856
+1,811
| +4% | +$91.2K |
|
|
MIC
1852
DELISTED
Macquarie Infrastructure Holdings, LLC
MIC
| $2.55M | ﹤0.01% |
65,940
+7,251
| +12% | +$286K |
|
|
HZNP
1853
CALL
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $2.55M | ﹤0.01% |
26,400
-4,100
| -13% | -$426K |
|
1854
PUT
F5
FFIV
$22.1B
| $2.55M | ﹤0.01% |
13,500
| – | – |
|
1855
CALL
Domo
DOMO
$166M
| $2.54M | ﹤0.01% |
31,700
+400
| +1% | +$34.2K |
|
1856
CALL
Sarepta Therapeutics
SRPT
$1.66B
| $2.54M | ﹤0.01% |
32,500
-200
| -0.6% | -$15.4K |
|
1857
AngloGold Ashanti
AU
$40.3B
| $2.54M | ﹤0.01% |
136,253
+200
| +0.1% | +$3.46K |
|
1858
PUT
Yum China
YUMC
$14.9B
| $2.54M | ﹤0.01% |
38,500
-300
| -0.8% | -$18.4K |
|
1859
CALL
RLX Technology
RLX
$2.48B
| $2.53M | ﹤0.01% |
289,000
+1,900
| +0.7% | +$10.3K |
|
|
BRSL
1860
CALL
Brightstar Lottery PLC
BRSL
$1.91B
| $2.53M | ﹤0.01% |
105,600
-400
| -0.4% | -$8.48K |
|
1861
PUT
Ericsson
ERIC
$30.7B
| $2.53M | ﹤0.01% |
198,400
+100
| +0.1% | +$1.18K |
|
|
LX
1862
PUT
LexinFintech Holdings
LX
$244M
| $2.52M | ﹤0.01% |
213,100
+900
| +0.4% | +$6.93K |
|
1863
CALL
Citizens Financial Group
CFG
$30.4B
| $2.52M | ﹤0.01% |
54,300
-6,000
| -10% | -$263K |
|
1864
CALL
Banco Macro
BMA
$5.7B
| $2.52M | ﹤0.01% |
170,200
| – | – |
|
1865
PUT
ICICI Bank
IBN
$106B
| $2.52M | ﹤0.01% |
147,000
| – | – |
|
1866
PUT
Kinder Morgan
KMI
$73.1B
| $2.51M | ﹤0.01% |
136,300
+800
| +0.6% | +$13.6K |
|
1867
CALL
Owens Corning
OC
$11.5B
| $2.51M | ﹤0.01% |
25,300
+200
| +0.8% | +$18.8K |
|
|
VIEW
1868
CALL
DELISTED
View, Inc. Class A Common Stock
VIEW
| $2.51M | ﹤0.01% |
5,245
+7
| +0.1% | +$2.46K |
|
1869
Canadian Natural Resources
CNQ
$96.9B
| $2.51M | ﹤0.01% |
139,068
-409
| -0.3% | -$6.74K |
|
|
RADA
1870
PUT
DELISTED
Rada Electronic Industries Ltd
RADA
| $2.51M | ﹤0.01% |
212,000
| – | – |
|
1871
CALL
Enbridge
ENB
$124B
| $2.51M | ﹤0.01% |
62,100
+1,000
| +2% | +$39.4K |
|
|
BLDP
1872
PUT
Ballard Power Systems
BLDP
$874M
| $2.5M | ﹤0.01% |
137,500
-1,600
| -1% | -$25.3K |
|
1873
Cummins
CMI
$91.7B
| $2.5M | ﹤0.01% |
10,347
| – | – |
|
1874
CALL
Crown Holdings
CCK
$12.8B
| $2.5M | ﹤0.01% |
24,200
| – | – |
|
1875
CALL
Commault Systems
CVLT
$5.89B
| $2.5M | ﹤0.01% |
31,900
| – | – |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.