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 | |
|---|---|---|---|---|---|---|
901
CALL
Restaurant Brands International
QSR
$25.1B
| $7.52M | 0.01% |
115,400
-5,100
| -4% | -$327K |
|
902
JD.com
JD
$40.6B
| $7.51M | 0.01% |
97,021
+51,519
| +113% | +$3.8M |
|
|
OZON
903
CALL
DELISTED
Ozon Holdings PLC American Depositary Shares, each ADS representing one ordinary share
OZON
| $7.51M | 0.01% |
129,500
-400
| -0.3% | -$21K |
|
904
PUT
Asana
ASAN
$1.51B
| $7.51M | 0.01% |
122,400
-800
| -0.6% | -$66.4K |
|
905
Qualcomm
QCOM
$180B
| $7.47M | 0.01% |
53,074
+8,528
| +19% | +$1.21M |
|
906
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$16.3B
| $7.46M | 0.01% |
84,844
+23,537
| +38% | +$2.06M |
|
907
CALL
Kohl's
KSS
$2.06B
| $7.45M | 0.01% |
135,100
+1,000
| +0.7% | +$53.4K |
|
908
Take-Two Interactive
TTWO
$42.7B
| $7.42M | 0.01% |
41,478
+4,791
| +13% | +$776K |
|
909
CALL
General Mills
GIS
$19B
| $7.42M | 0.01% |
123,200
+8,400
| +7% | +$496K |
|
910
PUT
Corpay
CPAY
$23.8B
| $7.41M | 0.01% |
28,900
-100
| -0.3% | -$25.9K |
|
911
CALL
AB InBev
BUD
$155B
| $7.4M | 0.01% |
102,700
+9,900
| +11% | +$621K |
|
912
PUT
BILL Holdings
BILL
$4.11B
| $7.39M | 0.01% |
41,100
| – | – |
|
913
PUT
Interactive Brokers
IBKR
$40.9B
| $7.38M | 0.01% |
446,400
-400
| -0.1% | -$6.3K |
|
914
CALL
Kinder Morgan
KMI
$72.9B
| $7.38M | 0.01% |
400,700
+61,200
| +18% | +$1.04M |
|
915
CALL
Bausch Health
BHC
$1.66B
| $7.38M | 0.01% |
245,600
+8,000
| +3% | +$227K |
|
916
CALL
Affirm
AFRM
$23.8B
| $7.38M | 0.01% |
107,900
+3,300
| +3% | +$264K |
|
917
PUT
Halliburton
HAL
$27.3B
| $7.36M | 0.01% |
309,200
+7,000
| +2% | +$143K |
|
918
CALL
Norfolk Southern
NSC
$78.3B
| $7.35M | 0.01% |
27,300
-100
| -0.4% | -$25.6K |
|
919
CALL
Tandem Diabetes Care
TNDM
$1.16B
| $7.35M | 0.01% |
75,300
+800
| +1% | +$88.1K |
|
920
Walmart Inc
WMT
$863B
| $7.33M | 0.01% |
157,905
+20,061
| +15% | +$967K |
|
921
VanEck Gold Miners ETF
GDX
$22.9B
| $7.33M | 0.01% |
215,742
-6,376
| -3% | -$208K |
|
922
PUT
Regency Centers
REG
$14.9B
| $7.32M | 0.01% |
112,900
| – | – |
|
923
PUT
EOG Resources
EOG
$77.5B
| $7.31M | 0.01% |
85,000
+2,100
| +3% | +$153K |
|
|
NUAN
924
CALL
DELISTED
Nuance Communications, Inc.
NUAN
| $7.28M | 0.01% |
133,400
| – | – |
|
925
PUT
Clean Energy Fuels
CLNE
$460M
| $7.24M | 0.01% |
693,600
+11,000
| +2% | +$87.5K |
|
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.