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 | |
|---|---|---|---|---|---|---|
2151
XPO
XPO
$25B
| $1.98M | ﹤0.01% |
23,522
-18,846
| -44% | -$945K |
|
2152
Electronic Arts
EA
$52.4B
| $1.98M | ﹤0.01% |
13,899
+1,134
| +9% | +$159K |
|
2153
CALL
Halozyme
HALO
$9.72B
| $1.97M | ﹤0.01% |
42,600
+100
| +0.2% | +$4.18K |
|
|
IRBT
2154
CALL
DELISTED
iRobot
IRBT
| $1.97M | ﹤0.01% |
21,800
+1,300
| +6% | +$111K |
|
|
PENG
2155
Penguin Solutions Inc
PENG
$2.76B
| $1.97M | ﹤0.01% |
83,618
+12,132
| +17% | +$290K |
|
|
AMRS
2156
DELISTED
Amyris Inc.
AMRS
| $1.97M | ﹤0.01% |
116,090
-2,869
| -2% | -$41.1K |
|
2157
CALL
Bloom Energy
BE
$52.6B
| $1.97M | ﹤0.01% |
74,000
| – | – |
|
2158
CALL
UGI
UGI
$8B
| $1.97M | ﹤0.01% |
42,100
| – | – |
|
2159
PUT
American Well
AMWL
$181M
| $1.97M | ﹤0.01% |
7,800
| – | – |
|
2160
CALL
Urban Outfitters
URBN
$5.99B
| $1.97M | ﹤0.01% |
48,000
-200
| -0.4% | -$7.15K |
|
2161
PUT
American Superconductor
AMSC
$1.48B
| $1.97M | ﹤0.01% |
110,600
| – | – |
|
2162
PUT
Teradyne
TER
$54.8B
| $1.97M | ﹤0.01% |
15,200
+300
| +2% | +$36.5K |
|
2163
Corteva
CTVA
$59.7B
| $1.97M | ﹤0.01% |
44,047
+3,193
| +8% | +$138K |
|
2164
CALL
Camping World
CWH
$363M
| $1.97M | ﹤0.01% |
47,500
+2,100
| +5% | +$82.5K |
|
2165
PUT
Bionano Genomics
BNGO
$12.7M
| $1.96M | ﹤0.01% |
480
+5
| +1% | +$17.5K |
|
|
2166
Camping World
CWH
$363M
| $1.96M | ﹤0.01% |
47,471
+3,865
| +9% | +$152K |
|
2167
CALL
Jack in the Box
JACK
$278M
| $1.96M | ﹤0.01% |
17,400
+1,900
| +12% | +$198K |
|
2168
CALL
SelectQuote
SLQT
$114M
| $1.96M | ﹤0.01% |
99,400
-800
| -0.8% | -$12K |
|
2169
UWM Holdings
UWMC
$621M
| $1.96M | ﹤0.01% |
238,927
-269
| -0.1% | -$2K |
|
|
EAR
2170
CALL
DELISTED
Eargo, Inc. Common Stock
EAR
| $1.96M | ﹤0.01% |
2,540
| – | – |
|
2171
Elastic
ESTC
$6.1B
| $1.96M | ﹤0.01% |
13,429
+118
| +0.9% | +$18.1K |
|
2172
PUT
Vuzix
VUZI
$190M
| $1.96M | ﹤0.01% |
108,100
+300
| +0.3% | +$4.01K |
|
2173
Playboy Inc
PLBY
$141M
| $1.96M | ﹤0.01% |
51,949
-519
| -1% | -$13.9K |
|
2174
PUT
Tanger
SKT
$4.82B
| $1.96M | ﹤0.01% |
101,400
+1,000
| +1% | +$17.4K |
|
|
ARNC
2175
CALL
DELISTED
Arconic Corporation
ARNC
| $1.96M | ﹤0.01% |
55,000
| – | – |
|
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.