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 | |
|---|---|---|---|---|---|---|
1026
PUT
International Paper
IP
$20.1B
| $6.22M | 0.01% |
106,867
-845
| -0.8% | -$47K |
|
1027
CALL
STMicroelectronics
STM
$47.7B
| $6.21M | 0.01% |
170,400
| – | – |
|
1028
CALL
Take-Two Interactive
TTWO
$42.7B
| $6.19M | 0.01% |
34,600
+200
| +0.6% | +$32.4K |
|
1029
CALL
CoStar Group
CSGP
$11.1B
| $6.18M | 0.01% |
74,200
+2,300
| +3% | +$199K |
|
1030
PUT
MasTec
MTZ
$28.4B
| $6.17M | 0.01% |
58,000
| – | – |
|
1031
PUT
OneMain Financial
OMF
$6.79B
| $6.17M | 0.01% |
102,100
| – | – |
|
|
EXAS
1032
PUT
DELISTED
Exact Sciences
EXAS
| $6.17M | 0.01% |
49,700
| – | – |
|
1033
CALL
InMode
INMD
$867M
| $6.15M | 0.01% |
130,200
+200
| +0.2% | +$12.2K |
|
1034
PUT
Builders FirstSource
BLDR
$7.59B
| $6.14M | 0.01% |
140,700
+400
| +0.3% | +$19.5K |
|
|
SPR
1035
PUT
DELISTED
Spirit AeroSystems
SPR
| $6.14M | 0.01% |
128,800
| – | – |
|
1036
CALL
Genuine Parts
GPC
$16.6B
| $6.13M | 0.01% |
47,800
| – | – |
|
1037
CALL
Synopsys
SNPS
$71.5B
| $6.12M | 0.01% |
22,100
+100
| +0.5% | +$30.4K |
|
1038
Okta
OKTA
$23.7B
| $6.12M | 0.01% |
25,437
+1,504
| +6% | +$373K |
|
1039
Direxion Daily Financial Bull 3x ETF
FAS
$2.35B
| $6.12M | 0.01% |
54,679
+35,317
| +182% | +$4.06M |
|
1040
Comcast
CMCSA
$78.3B
| $6.12M | 0.01% |
105,938
+29,724
| +39% | +$1.73M |
|
1041
PUT
Sonos
SONO
$1.73B
| $6.11M | 0.01% |
171,500
-2,500
| -1% | -$90.1K |
|
1042
CALL
Infosys
INFY
$43.2B
| $6.11M | 0.01% |
291,600
| – | – |
|
1043
PUT
Energy Transfer Partners
ET
$70.3B
| $6.1M | 0.01% |
570,300
-4,000
| -0.7% | -$38.4K |
|
1044
PUT
Clorox
CLX
$11.3B
| $6.1M | 0.01% |
34,100
+500
| +1% | +$86.1K |
|
|
HZNP
1045
PUT
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $6.09M | 0.01% |
63,100
| – | – |
|
1046
PUT
Suncor Energy
SU
$78.4B
| $6.09M | 0.01% |
249,800
-1,700
| -0.7% | -$34K |
|
1047
PUT
GoDaddy
GDDY
$11.6B
| $6.09M | 0.01% |
68,800
| – | – |
|
1048
CALL
American International
AIG
$41.4B
| $6.08M | 0.01% |
126,000
-500
| -0.4% | -$25.8K |
|
1049
CALL
RingCentral
RNG
$3.24B
| $6.07M | 0.01% |
21,000
| – | – |
|
1050
CALL
3D Systems Corp
DDD
$423M
| $6.07M | 0.01% |
157,700
+26,000
| +20% | +$770K |
|
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.