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 | |
|---|---|---|---|---|---|---|
2326
PUT
Atossa Therapeutics
ATOS
$22.9M
| $1.75M | ﹤0.01% |
18,280
-1,100
| -6% | -$64K |
|
2327
PUT
Gen Digital
GEN
$15.6B
| $1.75M | ﹤0.01% |
64,500
| – | – |
|
2328
CALL
Porch Group
PRCH
$1.3B
| $1.75M | ﹤0.01% |
86,900
+800
| +0.9% | +$15K |
|
|
AZUL
2329
PUT
DELISTED
Azul
AZUL
| $1.75M | ﹤0.01% |
67,000
+200
| +0.3% | +$4.38K |
|
2330
D.R. Horton
DHI
$41B
| $1.75M | ﹤0.01% |
18,863
+9,567
| +103% | +$881K |
|
2331
Lithia Motors
LAD
$7.78B
| $1.75M | ﹤0.01% |
4,956
+1,600
| +48% | +$557K |
|
2332
CALL
Moelis & Co
MC
$4.98B
| $1.75M | ﹤0.01% |
30,700
| – | – |
|
|
MOMO
2333
Hello Group
MOMO
$869M
| $1.75M | ﹤0.01% |
114,286
-5,370
| -4% | -$67.3K |
|
2334
CALL
PureCycle Technologies
PCT
$1.17B
| $1.75M | ﹤0.01% |
71,400
| – | – |
|
2335
CALL
Pultegroup
PHM
$24.5B
| $1.75M | ﹤0.01% |
31,300
+100
| +0.3% | +$5.2K |
|
2336
Interactive Brokers
IBKR
$40.9B
| $1.75M | ﹤0.01% |
105,536
-36
| -0% | -$567 |
|
|
ALTU
2337
PUT
DELISTED
Altitude Acquisition Corp
ALTU
| $1.75M | ﹤0.01% |
178,400
| – | – |
|
2338
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$69.2M
| $1.74M | ﹤0.01% |
22,100
| – | – |
|
2339
PUT
Invesco CurrencyShares Swiss Franc Trust
FXF
$409M
| $1.74M | ﹤0.01% |
17,800
| – | – |
|
2340
Zillow
ZG
$7.02B
| $1.74M | ﹤0.01% |
14,337
+679
| +5% | +$69.3K |
|
2341
CALL
Hyatt Hotels
H
$17.6B
| $1.74M | ﹤0.01% |
22,100
+100
| +0.5% | +$7.54K |
|
2342
Vroom Inc
VRM
$36.9M
| $1.74M | ﹤0.01% |
511
| – | – |
|
2343
CALL
McKesson
MCK
$98.5B
| $1.73M | ﹤0.01% |
9,000
+400
| +5% | +$80K |
|
2344
PUT
CoreCivic
CXW
$3.1B
| $1.73M | ﹤0.01% |
163,700
+1,000
| +0.6% | +$9.74K |
|
2345
Teva Pharmaceuticals
TEVA
$35.9B
| $1.73M | ﹤0.01% |
174,723
| – | – |
|
2346
EOG Resources
EOG
$78B
| $1.73M | ﹤0.01% |
20,105
-3,474
| -15% | -$253K |
|
2347
CALL
Five Below
FIVE
$11.2B
| $1.73M | ﹤0.01% |
8,800
| – | – |
|
|
PR
2348
CALL
Permian Resources
PR
$17.9B
| $1.73M | ﹤0.01% |
240,100
+8,800
| +4% | +$48K |
|
|
MAG
2349
PUT
DELISTED
MAG Silver
MAG
| $1.73M | ﹤0.01% |
82,400
| – | – |
|
2350
CALL
Martin Marietta Materials
MLM
$33.6B
| $1.73M | ﹤0.01% |
4,900
+900
| +23% | +$327K |
|
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.