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 | Miscellaneous | 97.72% |
| 2 | Technology | 0.49% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.27% |
| 5 | Healthcare | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
826
PUT
Estee Lauder
EL
$37.6B
| $8.37M | 0.01% |
26,400
+500
| +2% | +$163K |
|
827
PUT
Radware
RDWR
$1.19B
| $8.37M | 0.01% |
269,800
| – | – |
|
828
CALL
Asana
ASAN
$2.02B
| $8.36M | 0.01% |
136,300
+26,100
| +24% | +$2.17M |
|
|
LAZR
829
CALL
DELISTED
Luminar Technologies
LAZR
| $8.35M | 0.01% |
26,033
-640
| -2% | -$169K |
|
830
TAL Education Group
TAL
$6.88B
| $8.34M | 0.01% |
356,582
-2,912
| -0.8% | -$25.8K |
|
|
UCD
831
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $8.34M | 0.01% |
153,200
| – | – |
|
|
IPOF
832
PUT
DELISTED
Social Capital Hedosophia Holdings Corp. VI
IPOF
| $8.34M | 0.01% |
816,200
+100
| +0% | +$1K |
|
|
IPFF
833
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $8.32M | 0.01% |
128,700
| – | – |
|
834
PUT
Otis Worldwide
OTIS
$27.1B
| $8.32M | 0.01% |
101,400
+100
| +0.1% | +$8.79K |
|
835
iShares US Real Estate ETF
IYR
$4.33B
| $8.29M | 0.01% |
81,007
-300
| -0.4% | -$31.9K |
|
836
CALL
British American Tobacco
BTI
$119B
| $8.28M | 0.01% |
210,000
+119,400
| +132% | +$4.48M |
|
837
CALL
SolarEdge
SEDG
$2.1B
| $8.27M | 0.01% |
30,100
-400
| -1% | -$109K |
|
|
RDFN
838
PUT
DELISTED
Redfin
RDFN
| $8.27M | 0.01% |
128,100
-900
| -0.7% | -$48.7K |
|
839
CALL
Steel Dynamics
STLD
$34.7B
| $8.25M | 0.01% |
135,400
-1,200
| -0.9% | -$76.7K |
|
840
CALL
Antero Resources
AR
$12.1B
| $8.24M | 0.01% |
547,200
+1,800
| +0.3% | +$26.3K |
|
841
PUT
Cadence Design Systems
CDNS
$80.6B
| $8.23M | 0.01% |
60,100
| – | – |
|
842
PUT
Cognex
CGNX
$10.5B
| $8.21M | 0.01% |
97,600
| – | – |
|
843
PUT
Canadian National Railway
CNI
$74.6B
| $8.2M | 0.01% |
77,600
| – | – |
|
844
CALL
Corning
GLW
$133B
| $8.18M | 0.01% |
199,100
-600
| -0.3% | -$24K |
|
845
Datadog
DDOG
$76.5B
| $8.15M | 0.01% |
77,946
-65
| -0.1% | -$8.21K |
|
846
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
$4.12B
| $8.13M | 0.01% |
82,177
+880
| +1% | +$74.9K |
|
|
CPE
847
PUT
DELISTED
Callon Petroleum Company
CPE
| $8.12M | 0.01% |
136,500
+3,500
| +3% | +$135K |
|
848
CALL
Agnico Eagle Mines
AEM
$104B
| $8.11M | 0.01% |
134,100
-200
| -0.1% | -$11.6K |
|
849
CALL
Duke Energy
DUK
$93.7B
| $8.1M | 0.01% |
81,400
+1,300
| +2% | +$135K |
|
850
CALL
KLA
KLAC
$242B
| $8.07M | 0.01% |
259,000
+17,000
| +7% | +$568K |
|
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 84 new positions and exited 267, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 84 new positions and closed 267 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.