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 | |
|---|---|---|---|---|---|---|
1976
CALL
The Beachbody Company
BODI
$78.9M
| $2.3M | ﹤0.01% |
4,492
+484
| +12% | +$194K |
|
1977
CALL
EQT Corp
EQT
$33.2B
| $2.29M | ﹤0.01% |
103,700
+3,000
| +3% | +$58K |
|
1978
CALL
BARK
BARK
$74.8M
| $2.29M | ﹤0.01% |
10,990
-70
| -0.6% | -$11.5K |
|
|
CS
1979
CALL
DELISTED
Credit Suisse Group
CS
| $2.28M | ﹤0.01% |
216,200
-300
| -0.1% | -$3.06K |
|
1980
Celanese
CE
$5.09B
| $2.28M | ﹤0.01% |
14,891
-471
| -3% | -$72.5K |
|
|
GOEV
1981
CALL
DELISTED
Canoo Inc. Class A Common Stock
GOEV
| $2.28M | ﹤0.01% |
523
+64
| +14% | +$228K |
|
1982
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.8B
| $2.28M | ﹤0.01% |
6,579
-15,317
| -70% | -$5.35M |
|
1983
Public Storage
PSA
$60.2B
| $2.28M | ﹤0.01% |
7,588
-119
| -2% | -$37.3K |
|
1984
PUT
Tower Semiconductor
TSEM
$26.4B
| $2.28M | ﹤0.01% |
77,500
| – | – |
|
1985
PUT
Jefferies Financial Group
JEF
$12.9B
| $2.27M | ﹤0.01% |
70,187
+3,243
| +5% | +$109K |
|
1986
UiPath
PATH
$5.62B
| $2.27M | ﹤0.01% |
33,651
+1,830
| +6% | +$111K |
|
1987
PUT
Macerich
MAC
$7.32B
| $2.27M | ﹤0.01% |
122,500
+12,500
| +11% | +$212K |
|
1988
PUT
Goodyear
GT
$2.07B
| $2.26M | ﹤0.01% |
130,000
| – | – |
|
1989
PUT
Krystal Biotech
KRYS
$9.88B
| $2.26M | ﹤0.01% |
31,500
| – | – |
|
|
SGI
1990
CALL
Somnigroup International
SGI
$15.1B
| $2.26M | ﹤0.01% |
54,400
-3,500
| -6% | -$153K |
|
1991
Vanguard Total Stock Market ETF
VTI
$654B
| $2.26M | ﹤0.01% |
10,078
+198
| +2% | +$45.2K |
|
1992
PUT
Abits Group
ABTS
$3.38M
| $2.25M | ﹤0.01% |
6,760
+740
| +12% | +$145K |
|
1993
PUT
Packaging Corp of America
PKG
$22.7B
| $2.25M | ﹤0.01% |
16,500
| – | – |
|
1994
CALL
Aurinia Pharmaceuticals
AUPH
$1.97B
| $2.25M | ﹤0.01% |
173,500
+3,300
| +2% | +$52.4K |
|
1995
Centene
CNC
$31.3B
| $2.25M | ﹤0.01% |
30,514
-242
| -0.8% | -$16.2K |
|
1996
CALL
Americold
COLD
$4.09B
| $2.25M | ﹤0.01% |
59,500
| – | – |
|
1997
PUT
Danaos Corp
DAC
$2.55B
| $2.24M | ﹤0.01% |
30,000
| – | – |
|
1998
CALL
JFrog
FROG
$9.71B
| $2.24M | ﹤0.01% |
47,900
| – | – |
|
1999
CALL
MSCI
MSCI
$40B
| $2.24M | ﹤0.01% |
4,200
| – | – |
|
|
FRMM
2000
CALL
Forum Markets
FRMM
$75.7M
| $2.24M | ﹤0.01% |
60
| – | – |
|
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.