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 |
Amazon
AMZN
|
+$148M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$67.3M |
| 3 |
Meta Platforms (Facebook)
META
|
+$63.2M |
| 4 |
Goldman Sachs
GS
|
+$23.9M |
| 5 |
Citigroup
C
|
+$23.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Berkshire Hathaway Class B
BRK.B
|
+$47.5M |
| 2 |
Apple
AAPL
|
+$46M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$44.5M |
| 4 |
Micron Technology
MU
|
+$29.1M |
| 5 |
Adobe
ADBE
|
+$22.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 1.13% |
| 2 | Communication Services | 0.89% |
| 3 | Technology | 0.68% |
| 4 | Industrials | 0.51% |
| 5 | Healthcare | 0.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
26
PUT
Booking.com
BKNG
$139B
| $159M | 0.51% |
20,025
-4,200
| -17% | -$331K |
|
|
27
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $144M | 0.46% |
5,463
+1,279
| +31% | +$327K |
|
|
28
CALL
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $143M | 0.46% |
5,392
-280
| -5% | -$71.7K |
|
29
CALL
Boeing
BA
$161B
| $139M | 0.45% |
3,741
-2,257
| -38% | -$793K |
|
|
30
CALL
Goldman Sachs
GS
$311B
| $118M | 0.38% |
5,247
-1,957
| -27% | -$455K |
|
31
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $114M | 0.37% |
32,216
-4,944
| -13% | -$146K |
|
32
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $109M | 0.35% |
32,234
+12,441
| +63% | +$280K |
|
|
33
PUT
Micron Technology
MU
$1.1T
| $105M | 0.34% |
23,314
-4,840
| -17% | -$244K |
|
|
34
CALL
Micron Technology
MU
$1.1T
| $101M | 0.32% |
22,306
+5,213
| +30% | +$263K |
|
35
CALL
SPDR Gold Trust
GLD
$132B
| $98.4M | 0.32% |
8,724
+2,317
| +36% | +$266K |
|
|
36
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $97M | 0.31% |
26,572
+8,313
| +46% | +$187K |
|
37
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $94.4M | 0.3% |
17,406
+5,508
| +46% | +$110K |
|
38
PUT
Baidu
BIDU
$36.8B
| $94.3M | 0.3% |
4,125
+990
| +32% | +$233K |
|
39
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $93.7M | 0.3% |
17,392
+3,023
| +21% | +$285K |
|
|
XYZ
40
PUT
Block Inc
XYZ
$47.8B
| $90.9M | 0.29% |
9,178
+362
| +4% | +$27.9K |
|
|
41
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $89.6M | 0.29% |
4,185
+1,355
| +48% | +$278K |
|
|
42
CALL
Booking.com
BKNG
$139B
| $89.1M | 0.29% |
11,225
-1,200
| -10% | -$94.5K |
|
43
PUT
Salesforce
CRM
$139B
| $86.6M | 0.28% |
5,446
-143
| -3% | -$21.2K |
|
|
44
CALL
Adobe
ADBE
$90.3B
| $84.9M | 0.27% |
3,144
+1,357
| +76% | +$350K |
|
45
CALL
ExxonMobil
XOM
$629B
| $84M | 0.27% |
9,885
+3,146
| +47% | +$257K |
|
|
46
PUT
Goldman Sachs
GS
$311B
| $83.5M | 0.27% |
3,725
+930
| +33% | +$216K |
|
47
CALL
Microsoft
MSFT
$2.95T
| $83.3M | 0.27% |
7,280
-2,573
| -26% | -$279K |
|
48
PUT
Home Depot
HD
$332B
| $81.1M | 0.26% |
3,914
+103
| +3% | +$20.7K |
|
49
CALL
IBM
IBM
$198B
| $79.7M | 0.26% |
5,511
+994
| +22% | +$139K |
|
50
PUT
JPMorgan Chase
JPM
$901B
| $78.9M | 0.25% |
6,999
+2,148
| +44% | +$244K |
|
Similar funds
Simplex Trading's Q3 2018 Portfolio in Review
As of Q3 2018, Simplex Trading held 8,699 positions worth $31.1B, up 22% from $25.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.
Simplex Trading's Q3 2018 filing shows 1,336 new, 3,066 increased, 2,755 reduced and 1,315 closed positions. Its largest new stake was Invesco QQQ Trust: 371,806 shares worth $69.1M. The largest sale was Berkshire Hathaway Class B, an estimated $47.5M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 1.1% of assets, up from 0.92% a quarter earlier, followed by Communication Services and Technology.
- Simplex Trading's largest Q3 2018 buy was Invesco QQQ Trust: 371,806 shares worth $69.1M.
- Simplex Trading added most to Amazon in Q3 2018, an estimated $148M increase.
- Simplex Trading's biggest Q3 2018 reduction was Apple, cutting an estimated $46M.
- Simplex Trading fully exited Berkshire Hathaway Class B in Q3 2018, selling an estimated $47.5M.
- Simplex Trading's ten largest holdings make up 34% of its $31.1B portfolio in Q3 2018.
- Simplex Trading opened 1,336 new positions and closed 1,315 in Q3 2018.
- Simplex Trading's portfolio value rose 22% quarter-over-quarter to $31.1B.
Based on Simplex Trading's 13F filing for Q3 2018, filed 23 Oct 2018.