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 | |
|---|---|---|---|---|---|---|
2126
PUT
United Microelectronic
UMC
$48.9B
| $2.02M | ﹤0.01% |
217,900
| – | – |
|
2127
PUT
Fluor
FLR
$7.29B
| $2.02M | ﹤0.01% |
114,300
| – | – |
|
|
GOOS
2128
CALL
Canada Goose Holdings
GOOS
$868M
| $2.01M | ﹤0.01% |
45,500
+6,000
| +15% | +$239K |
|
2129
PUT
LPL Financial
LPLA
$26.3B
| $2.01M | ﹤0.01% |
14,300
| – | – |
|
2130
CALL
Arrow Electronics
ARW
$10.9B
| $2.01M | ﹤0.01% |
17,500
| – | – |
|
2131
CALL
Kodak
KODK
$806M
| $2.01M | ﹤0.01% |
241,200
+10,800
| +5% | +$78.8K |
|
|
SPCK
2132
The SPAC and New Issue ETF
SPCK
$8.3M
| $2M | ﹤0.01% |
68,789
-199
| -0.3% | -$5.74K |
|
2133
EPR Properties
EPR
$4.86B
| $2M | ﹤0.01% |
37,897
| – | – |
|
2134
iShares US Home Construction ETF
ITB
$2.41B
| $2M | ﹤0.01% |
28,395
+300
| +1% | +$21.1K |
|
2135
PUT
Navios Maritime Partners
NMM
$2.25B
| $2M | ﹤0.01% |
72,300
+1,000
| +1% | +$26.3K |
|
2136
PUT
PG&E
PCG
$47.8B
| $2M | ﹤0.01% |
193,200
+300
| +0.2% | +$2.83K |
|
2137
Williams-Sonoma
WSM
$26.7B
| $2M | ﹤0.01% |
24,924
| – | – |
|
2138
PUT
Blink Charging
BLNK
$75.2M
| $2M | ﹤0.01% |
50,200
+11,900
| +31% | +$386K |
|
2139
PUT
IPG Photonics
IPGP
$3.89B
| $2M | ﹤0.01% |
9,500
| – | – |
|
2140
PUT
Petco
WOOF
$745M
| $2M | ﹤0.01% |
91,700
+100
| +0.1% | +$2.11K |
|
|
HZON
2141
PUT
DELISTED
Horizon Acquisition Corporation II
HZON
| $1.99M | ﹤0.01% |
203,700
| – | – |
|
2142
CALL
TG Therapeutics
TGTX
$8.58B
| $1.99M | ﹤0.01% |
49,200
+1,500
| +3% | +$46.4K |
|
2143
PUT
The GEO Group
GEO
$4.13B
| $1.99M | ﹤0.01% |
274,800
+200
| +0.1% | +$1.47K |
|
2144
PUT
TD Synnex
SNX
$19.4B
| $1.99M | ﹤0.01% |
16,300
| – | – |
|
2145
CALL
Knight Transportation
KNX
$11.8B
| $1.99M | ﹤0.01% |
43,400
-6,000
| -12% | -$302K |
|
|
AHT
2146
PUT
Ashford Hospitality Trust
AHT
$21M
| $1.99M | ﹤0.01% |
45,990
+41,414
| +905% | +$7.01M |
|
2147
PUT
BARK
BARK
$74.8M
| $1.99M | ﹤0.01% |
9,530
+540
| +6% | +$89K |
|
|
BGFV
2148
PUT
DELISTED
Big 5 Sporting Goods
BGFV
| $1.99M | ﹤0.01% |
73,800
+100
| +0.1% | +$2.45K |
|
2149
ArcelorMittal
MT
$50.4B
| $1.98M | ﹤0.01% |
63,395
-100
| -0.2% | -$3.27K |
|
2150
PUT
Dine Brands
DIN
$432M
| $1.98M | ﹤0.01% |
22,100
| – | – |
|
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.