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 | |
|---|---|---|---|---|---|---|
1051
PUT
Reinsurance Group of America
RGA
$15.3B
| $2.54M | 0.01% |
176
+61
| +53% | +$8.63K |
|
1052
CALL
Ashland
ASH
$3.05B
| $2.54M | 0.01% |
303
+222
| +274% | +$18.5K |
|
1053
PUT
Darden Restaurants
DRI
$22.2B
| $2.52M | 0.01% |
227
+68
| +43% | +$7.66K |
|
|
ALXN
1054
DELISTED
Alexion Pharmaceuticals
ALXN
| $2.52M | 0.01% |
18,136
-6,051
| -25% | -$759K |
|
1055
PUT
MSCI
MSCI
$40.2B
| $2.52M | 0.01% |
142
-119
| -46% | -$20.7K |
|
1056
PUT
Texas Roadhouse
TXRH
$12.5B
| $2.52M | 0.01% |
363
+346
| +2,035% | +$23.5K |
|
1057
PUT
Rockwell Automation
ROK
$51.3B
| $2.51M | 0.01% |
134
+34
| +34% | +$6.09K |
|
|
CEO
1058
PUT
DELISTED
CNOOC Limited
CEO
| $2.51M | 0.01% |
127
+40
| +46% | +$6.79K |
|
1059
CALL
EPAM Systems
EPAM
$4.5B
| $2.51M | 0.01% |
182
+93
| +104% | +$12.5K |
|
1060
PUT
PPG Industries
PPG
$25.4B
| $2.5M | 0.01% |
229
-112
| -33% | -$12.2K |
|
1061
CALL
Fidelity National Information Services
FIS
$20.7B
| $2.5M | 0.01% |
229
+220
| +2,444% | +$23.7K |
|
|
GRUB
1062
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $2.5M | 0.01% |
9,009
+2,986
| +50% | +$770K |
|
1063
PUT
Deckers Outdoor
DECK
$13.4B
| $2.49M | 0.01% |
1,260
-666
| -35% | -$12.9K |
|
1064
CALL
Jack in the Box
JACK
$263M
| $2.49M | 0.01% |
297
-19
| -6% | -$1.64K |
|
1065
CALL
Cracker Barrel
CBRL
$1.16B
| $2.49M | 0.01% |
169
-108
| -39% | -$16.2K |
|
1066
PUT
Eagle Materials
EXP
$6.4B
| $2.48M | 0.01% |
291
+243
| +506% | +$23.6K |
|
|
ZGNX
1067
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $2.48M | 0.01% |
500
-375
| -43% | -$19.1K |
|
1068
PUT
T. Rowe Price
TROW
$24.6B
| $2.48M | 0.01% |
227
+100
| +79% | +$11.6K |
|
1069
Zillow
Z
$6.77B
| $2.48M | 0.01% |
55,995
+42,570
| +317% | +$2.22M |
|
1070
Workday
WDAY
$31.6B
| $2.48M | 0.01% |
16,962
-17,947
| -51% | -$2.49M |
|
|
CTRA
1071
CALL
DELISTED
Coterra Energy
CTRA
| $2.47M | 0.01% |
1,099
+247
| +29% | +$5.76K |
|
1072
Mondelez International
MDLZ
$77.1B
| $2.47M | 0.01% |
57,459
+47,219
| +461% | +$2.01M |
|
|
HDP
1073
CALL
DELISTED
Hortonworks, Inc.
HDP
| $2.47M | 0.01% |
1,082
+30
| +3% | +$626 |
|
|
PDCE
1074
PUT
DELISTED
PDC Energy, Inc.
PDCE
| $2.47M | 0.01% |
504
+390
| +342% | +$21.6K |
|
1075
CALL
Labcorp
LH
$23.9B
| $2.47M | 0.01% |
165
-42
| -20% | -$6.39K |
|
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.