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 | |
|---|---|---|---|---|---|---|
1501
PUT
Silicon Motion
SIMO
$9.19B
| $3.58M | ﹤0.01% |
57,600
| – | – |
|
1502
CALL
Sempra
SRE
$60.8B
| $3.58M | ﹤0.01% |
53,400
-400
| -0.7% | -$26.4K |
|
1503
PUT
First Majestic Silver
AG
$8.05B
| $3.57M | ﹤0.01% |
228,500
-7,600
| -3% | -$98.1K |
|
1504
CALL
US Foods
USFD
$21.4B
| $3.56M | ﹤0.01% |
93,600
+1,000
| +1% | +$34.3K |
|
1505
CALL
Cummins
CMI
$91.7B
| $3.56M | ﹤0.01% |
14,700
+800
| +6% | +$187K |
|
1506
Skyworks Solutions
SWKS
$9.06B
| $3.56M | ﹤0.01% |
18,828
-2,746
| -13% | -$502K |
|
1507
PUT
Universal Health Services
UHS
$9.43B
| $3.56M | ﹤0.01% |
23,800
| – | – |
|
1508
CALL
Blink Charging
BLNK
$75.2M
| $3.56M | ﹤0.01% |
89,400
+13,800
| +18% | +$448K |
|
1509
DoorDash
DASH
$75.3B
| $3.56M | ﹤0.01% |
19,695
+333
| +2% | +$63.7K |
|
|
CCXI
1510
PUT
DELISTED
ChemoCentryx, Inc.
CCXI
| $3.55M | ﹤0.01% |
268,700
+12,100
| +5% | +$189K |
|
|
MGI
1511
CALL
DELISTED
MoneyGram International, Inc. New
MGI
| $3.54M | ﹤0.01% |
352,500
-2,200
| -0.6% | -$21K |
|
|
UNVR
1512
CALL
DELISTED
Univar Solutions Inc.
UNVR
| $3.54M | ﹤0.01% |
143,900
| – | – |
|
1513
PUT
MKS Inc
MKSI
$22.2B
| $3.53M | ﹤0.01% |
20,700
| – | – |
|
1514
PUT
Toyota
TM
$210B
| $3.53M | ﹤0.01% |
20,100
+100
| +0.5% | +$17.9K |
|
1515
CALL
Opendoor
OPEN
$3.69B
| $3.52M | ﹤0.01% |
212,970
-181,247
| -46% | -$2.93M |
|
1516
CALL
American Eagle Outfitters
AEO
$2.85B
| $3.52M | ﹤0.01% |
93,600
+1,000
| +1% | +$31.8K |
|
|
XM
1517
PUT
DELISTED
Qualtrics International Inc. Class A Common Stock
XM
| $3.52M | ﹤0.01% |
96,100
+2,100
| +2% | +$88.8K |
|
1518
CALL
Lamb Weston
LW
$6.85B
| $3.51M | ﹤0.01% |
43,500
+100
| +0.2% | +$6.77K |
|
|
BBBY
1519
PUT
Bed Bath & Beyond
BBBY
$473M
| $3.51M | ﹤0.01% |
42,790
+2,970
| +7% | +$206K |
|
1520
PUT
Quest Diagnostics
DGX
$25.1B
| $3.51M | ﹤0.01% |
26,400
| – | – |
|
1521
iShares Global Clean Energy ETF
ICLN
$2.38B
| $3.51M | ﹤0.01% |
149,027
+1,900
| +1% | +$43.3K |
|
1522
CALL
Titan Machinery
TITN
$466M
| $3.5M | ﹤0.01% |
110,500
-600
| -0.5% | -$16.8K |
|
1523
PUT
Five Below
FIVE
$11.2B
| $3.5M | ﹤0.01% |
17,800
| – | – |
|
1524
Sysco
SYY
$39.7B
| $3.49M | ﹤0.01% |
45,477
+600
| +1% | +$45.8K |
|
|
XM
1525
CALL
DELISTED
Qualtrics International Inc. Class A Common Stock
XM
| $3.49M | ﹤0.01% |
95,300
| – | – |
|
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.