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 | Miscellaneous | 97.72% |
| 2 | Technology | 0.49% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.27% |
| 5 | Healthcare | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1076
Caesars Entertainment
CZR
$6.05B
| $5.83M | 0.01% |
56,644
-4,604
| -8% | -$450K |
|
1077
CALL
Sunrun
RUN
$2.14B
| $5.8M | 0.01% |
103,235
-3,025
| -3% | -$144K |
|
1078
PUT
Planet Fitness
PLNT
$3.84B
| $5.79M | 0.01% |
76,800
+300
| +0.4% | +$22.8K |
|
1079
CALL
Cboe Global Markets
CBOE
$31.2B
| $5.78M | 0.01% |
48,800
+600
| +1% | +$73.3K |
|
1080
CALL
UiPath
PATH
$7.87B
| $5.76M | 0.01% |
85,500
+3,400
| +4% | +$206K |
|
1081
CALL
United Natural Foods
UNFI
$2.66B
| $5.75M | 0.01% |
155,900
| – | – |
|
1082
PUT
Global Payments
GPN
$24.5B
| $5.75M | 0.01% |
29,900
+100
| +0.3% | +$17.4K |
|
|
CALY
1083
CALL
Callaway Golf Company
CALY
$2.84B
| $5.74M | 0.01% |
171,100
+7,900
| +5% | +$240K |
|
|
CGC
1084
CALL
Canopy Growth
CGC
$437M
| $5.72M | 0.01% |
23,900
+840
| +4% | +$150K |
|
1085
Fiverr
FVRR
$333M
| $5.72M | 0.01% |
23,836
+85
| +0.4% | +$17.1K |
|
1086
CALL
Amphenol
APH
$204B
| $5.71M | 0.01% |
331,200
| – | – |
|
1087
CALL
Live Nation Entertainment
LYV
$40.4B
| $5.71M | 0.01% |
64,400
| – | – |
|
1088
PUT
Alnylam Pharmaceuticals
ALNY
$35.6B
| $5.7M | 0.01% |
33,600
+100
| +0.3% | +$18.8K |
|
1089
PUT
Enterprise Products Partners
EPD
$84.1B
| $5.7M | 0.01% |
233,000
+400
| +0.2% | +$9.09K |
|
|
PENG
1090
PUT
Penguin Solutions Inc
PENG
$2.65B
| $5.7M | 0.01% |
241,600
+36,000
| +18% | +$862K |
|
1091
CALL
United States Natural Gas Fund
UNG
$572M
| $5.69M | 0.01% |
111,150
+16,225
| +17% | +$978K |
|
1092
PUT
Rapid7
RPD
$741M
| $5.67M | 0.01% |
59,100
+1,000
| +2% | +$113K |
|
1093
PUT
Coherent
COHR
$55.2B
| $5.66M | 0.01% |
78,000
+200
| +0.3% | +$13.1K |
|
1094
PUT
Danaher
DHR
$146B
| $5.66M | 0.01% |
23,462
+338
| +1% | +$92K |
|
1095
CALL
PPG Industries
PPG
$25B
| $5.66M | 0.01% |
33,300
| – | – |
|
1096
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$300M
| $5.66M | 0.01% |
227,400
+300
| +0.1% | +$7.48K |
|
1097
PUT
HP
HPQ
$29.4B
| $5.65M | 0.01% |
186,300
+7,600
| +4% | +$218K |
|
|
AYX
1098
CALL
DELISTED
Alteryx Inc
AYX
| $5.65M | 0.01% |
67,600
-2,200
| -3% | -$166K |
|
1099
PUT
Westlake Corp
WLK
$9.56B
| $5.65M | 0.01% |
61,900
+300
| +0.5% | +$25.7K |
|
1100
CALL
Corsair Gaming
CRSR
$1.38B
| $5.63M | 0.01% |
171,700
+5,500
| +3% | +$158K |
|
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 84 new positions and exited 267, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 84 new positions and closed 267 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.