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 | |
|---|---|---|---|---|---|---|
|
SEE
2101
CALL
DELISTED
Sealed Air
SEE
| $2.05M | ﹤0.01% |
34,700
+300
| +0.9% | +$17.4K |
|
2102
PUT
Nano X Imaging
NNOX
$62.4M
| $2.05M | ﹤0.01% |
64,600
+500
| +0.8% | +$13.1K |
|
|
SBNY
2103
CALL
DELISTED
Signature Bank
SBNY
| $2.05M | ﹤0.01% |
8,200
| – | – |
|
2104
Suncor Energy
SU
$77.7B
| $2.05M | ﹤0.01% |
84,009
-2,289
| -3% | -$45.8K |
|
|
LPRO
2105
CALL
Open Lending Corp
LPRO
$373M
| $2.05M | ﹤0.01% |
49,200
+200
| +0.4% | +$7.65K |
|
|
SIX
2106
PUT
DELISTED
Six Flags Entertainment Corp.
SIX
| $2.05M | ﹤0.01% |
46,700
+100
| +0.2% | +$4.15K |
|
2107
CALL
Annaly Capital Management
NLY
$16.9B
| $2.04M | ﹤0.01% |
57,275
+2,975
| +5% | +$102K |
|
2108
CALL
Carrier Global
CARR
$57.2B
| $2.04M | ﹤0.01% |
41,900
+300
| +0.7% | +$16.1K |
|
|
DVAX
2109
CALL
DELISTED
Dynavax Technologies
DVAX
| $2.04M | ﹤0.01% |
199,700
+9,900
| +5% | +$131K |
|
2110
PUT
Coty
COTY
$2.33B
| $2.04M | ﹤0.01% |
219,300
+2,400
| +1% | +$20.5K |
|
2111
CALL
Aterian
ATER
$4.35M
| $2.04M | ﹤0.01% |
11,325
+1,200
| +12% | +$133K |
|
2112
Pacific Biosciences
PACB
$422M
| $2.04M | ﹤0.01% |
59,308
-2,107
| -3% | -$62.4K |
|
2113
McKesson
MCK
$98.5B
| $2.04M | ﹤0.01% |
10,564
+600
| +6% | +$120K |
|
2114
PUT
Butterfly Network
BFLY
$1.72B
| $2.03M | ﹤0.01% |
142,800
+100
| +0.1% | +$1.16K |
|
2115
JetBlue
JBLU
$1.96B
| $2.03M | ﹤0.01% |
118,785
-18,444
| -13% | -$283K |
|
2116
PUT
NovoCure
NVCR
$2.04B
| $2.03M | ﹤0.01% |
10,700
+600
| +6% | +$90.7K |
|
2117
Vanguard FTSE Europe ETF
VGK
$30B
| $2.03M | ﹤0.01% |
29,959
| – | – |
|
2118
CALL
Equifax
EFX
$20.3B
| $2.02M | ﹤0.01% |
8,400
| – | – |
|
2119
Halliburton
HAL
$27.9B
| $2.02M | ﹤0.01% |
85,124
-4,159
| -5% | -$85.2K |
|
2120
CALL
PBF Energy
PBF
$7.29B
| $2.02M | ﹤0.01% |
133,700
+2,500
| +2% | +$25.9K |
|
2121
PUT
SkinHealth Systems
SKIN
$94.9M
| $2.02M | ﹤0.01% |
112,200
+500
| +0.4% | +$11K |
|
2122
Tenet Healthcare
THC
$20.1B
| $2.02M | ﹤0.01% |
29,825
| – | – |
|
|
TIGR
2123
CALL
UP Fintech Holding
TIGR
$845M
| $2.02M | ﹤0.01% |
77,400
-2,400
| -3% | -$37.7K |
|
|
GTM
2124
CALL
ZoomInfo Technologies
GTM
$861M
| $2.02M | ﹤0.01% |
39,400
-300
| -0.8% | -$17.9K |
|
|
BTAQ
2125
PUT
DELISTED
Burgundy Technology Acquisition Corporation Class A Ordinary shares
BTAQ
| $2.02M | ﹤0.01% |
205,600
| – | – |
|
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.