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 | Miscellaneous | 95.2% |
| 2 | Consumer Discretionary | 1.14% |
| 3 | Communication Services | 0.9% |
| 4 | Technology | 0.69% |
| 5 | Industrials | 0.52% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
776
PUT
DaVita
DVA
$11.7B
| $3.85M | 0.01% |
537
-324
| -38% | -$22.9K |
|
777
CALL
Skyworks Solutions
SWKS
$11.1B
| $3.84M | 0.01% |
423
+68
| +19% | +$6.36K |
|
778
Costco
COST
$406B
| $3.83M | 0.01% |
16,329
+6,868
| +73% | +$1.55M |
|
|
P
779
PUT
Everpure Inc
P
$33.1B
| $3.83M | 0.01% |
1,478
-145
| -9% | -$3.6K |
|
780
CALL
TransDigm Group
TDG
$64.2B
| $3.83M | 0.01% |
103
-102
| -50% | -$36.7K |
|
|
JWN
781
PUT
DELISTED
Nordstrom
JWN
| $3.83M | 0.01% |
641
+35
| +6% | +$2K |
|
782
PUT
Veeva Systems
VEEV
$44.5B
| $3.83M | 0.01% |
352
+132
| +60% | +$12K |
|
783
PUT
First Solar
FSLR
$22B
| $3.83M | 0.01% |
790
-505
| -39% | -$26.2K |
|
784
CALL
Johnson Controls International
JCI
$87.8B
| $3.81M | 0.01% |
1,088
+190
| +21% | +$7K |
|
785
PUT
Vipshop
VIPS
$6.28B
| $3.8M | 0.01% |
6,097
+5,223
| +598% | +$42.9K |
|
786
CALL
SBA Communications
SBAC
$20.1B
| $3.79M | 0.01% |
236
+195
| +476% | +$31.1K |
|
787
CALL
Microchip Technology
MCHP
$40.3B
| $3.78M | 0.01% |
958
+572
| +148% | +$25.3K |
|
788
PUT
Aptiv
APTV
$9.96B
| $3.77M | 0.01% |
451
+118
| +35% | +$10.8K |
|
789
Invesco CurrencyShares Euro Currency Trust
FXE
$370M
| $3.77M | 0.01% |
33,873
+24,866
| +276% | +$2.77M |
|
|
X
790
DELISTED
US Steel
X
| $3.76M | 0.01% |
123,454
+62,988
| +104% | +$2.03M |
|
791
PUT
HP
HPQ
$29.4B
| $3.76M | 0.01% |
1,459
-255
| -15% | -$6.16K |
|
792
PUT
LendingTree
TREE
$398M
| $3.75M | 0.01% |
163
-28
| -15% | -$6.66K |
|
793
CALL
Stanley Black & Decker
SWK
$14.7B
| $3.73M | 0.01% |
255
-17
| -6% | -$2.42K |
|
|
NXH
794
PUT
Neighborhood Intelligence Inc
NXH
$377M
| $3.73M | 0.01% |
1,794
+395
| +28% | +$9.73K |
|
|
FDC
795
PUT
DELISTED
First Data Corporation
FDC
| $3.73M | 0.01% |
1,525
+992
| +186% | +$23.9K |
|
796
CALL
Suncor Energy
SU
$78.8B
| $3.72M | 0.01% |
962
-23
| -2% | -$931 |
|
|
DATA
797
CALL
DELISTED
Tableau Software, Inc.
DATA
| $3.72M | 0.01% |
333
-82
| -20% | -$8.85K |
|
798
Domino's
DPZ
$11.3B
| $3.72M | 0.01% |
12,615
+5,470
| +77% | +$1.55M |
|
799
PUT
TripAdvisor
TRIP
$1.09B
| $3.71M | 0.01% |
727
-330
| -31% | -$18K |
|
800
PUT
Atlassian
TEAM
$48B
| $3.71M | 0.01% |
386
-57
| -13% | -$4.51K |
|
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, 2,754 reduced and 1,316 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 Miscellaneous at 95% of assets, up from 94% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- 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 1,316 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.