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 | |
|---|---|---|---|---|---|---|
751
PUT
XPO
XPO
$25.1B
| $3.97M | 0.01% |
1,006
+306
| +44% | +$11.1K |
|
752
PUT
Corpay
CPAY
$23.5B
| $3.96M | 0.01% |
174
+5
| +3% | +$1.09K |
|
753
CALL
Trip.com Group
TCOM
$26.8B
| $3.96M | 0.01% |
1,066
-73
| -6% | -$2.96K |
|
754
CALL
GE Aerospace
GE
$354B
| $3.96M | 0.01% |
732
-923
| -56% | -$56.9K |
|
|
CRC
755
CALL
DELISTED
California Resources Corporation
CRC
| $3.96M | 0.01% |
816
+365
| +81% | +$14.1K |
|
756
PUT
Crown Castle
CCI
$33.8B
| $3.95M | 0.01% |
355
-10
| -3% | -$1.11K |
|
757
CALL
Tractor Supply
TSCO
$15.4B
| $3.94M | 0.01% |
2,170
+350
| +19% | +$5.83K |
|
758
PUT
Goodyear
GT
$2.14B
| $3.93M | 0.01% |
1,681
+716
| +74% | +$16.8K |
|
|
ANDX
759
CALL
DELISTED
Andeavor Logistics LP
ANDX
| $3.93M | 0.01% |
809
+83
| +11% | +$3.9K |
|
|
COHR
760
CALL
DELISTED
Coherent Inc
COHR
| $3.92M | 0.01% |
228
-53
| -19% | -$9.33K |
|
|
ELLI
761
PUT
DELISTED
Ellie Mae Inc
ELLI
| $3.92M | 0.01% |
414
-77
| -16% | -$7.9K |
|
762
CALL
Marriott International
MAR
$97.5B
| $3.92M | 0.01% |
297
-156
| -34% | -$19.9K |
|
763
PUT
D.R. Horton
DHI
$40B
| $3.91M | 0.01% |
928
+667
| +256% | +$28.9K |
|
764
PUT
Vornado Realty Trust
VNO
$7.24B
| $3.91M | 0.01% |
536
+262
| +96% | +$19.4K |
|
765
PUT
Occidental Petroleum
OXY
$57.2B
| $3.91M | 0.01% |
476
-967
| -67% | -$78.2K |
|
766
MGM Resorts International
MGM
$11.6B
| $3.9M | 0.01% |
139,767
-37,177
| -21% | -$1.08M |
|
767
PUT
Credit Acceptance
CACC
$6.34B
| $3.9M | 0.01% |
89
+32
| +56% | +$13.4K |
|
768
Lam Research
LRCX
$399B
| $3.9M | 0.01% |
256,910
+181,350
| +240% | +$3.1M |
|
769
PUT
WEX
WEX
$5.4B
| $3.89M | 0.01% |
194
+170
| +708% | +$32.6K |
|
770
PUT
Pacira BioSciences
PCRX
$1.01B
| $3.89M | 0.01% |
791
+514
| +186% | +$22.2K |
|
771
CALL
Ubiquiti
UI
$32.5B
| $3.88M | 0.01% |
392
-202
| -34% | -$17.8K |
|
772
Bristol-Myers Squibb
BMY
$124B
| $3.87M | 0.01% |
62,365
-40,046
| -39% | -$2.38M |
|
773
CALL
PagSeguro Digital
PAGS
$2.7B
| $3.87M | 0.01% |
1,398
+219
| +19% | +$5.96K |
|
774
Constellation Brands
STZ
$22.6B
| $3.86M | 0.01% |
+17,905
| New | +$3.81M |
|
775
PUT
Cognizant
CTSH
$20.4B
| $3.86M | 0.01% |
500
-278
| -36% | -$21.7K |
|
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.