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 | |
|---|---|---|---|---|---|---|
3126
Tronox
TROX
$995M
| $312K | ﹤0.01% |
26,174
+9,067
| +53% | +$149K |
|
|
CSOD
3127
PUT
DELISTED
Cornerstone OnDemand, Inc.
CSOD
| $312K | ﹤0.01% |
55
-58
| -51% | -$3.13K |
|
|
ELLI
3128
CALL
DELISTED
Ellie Mae Inc
ELLI
| $312K | ﹤0.01% |
33
-81
| -71% | -$8.31K |
|
3129
PUT
Equity Residential
EQR
$25.4B
| $311K | ﹤0.01% |
47
-50
| -52% | -$3.31K |
|
3130
CALL
IQVIA
IQV
$34.7B
| $311K | ﹤0.01% |
24
+11
| +85% | +$1.32K |
|
3131
CALL
LivePerson
LPSN
$18.9M
| $311K | ﹤0.01% |
8
+4
| +100% | +$1.48K |
|
|
AEL
3132
DELISTED
American Equity Investment Life Holding Company
AEL
| $311K | ﹤0.01% |
8,813
+8,291
| +1,588% | +$299K |
|
|
WDR
3133
CALL
DELISTED
Waddell & Reed Financial, Inc.
WDR
| $311K | ﹤0.01% |
147
+40
| +37% | +$804 |
|
|
BHR
3134
PUT
Braemar Hotels & Resorts
BHR
$153M
| $310K | ﹤0.01% |
267
+245
| +1,114% | +$2.75K |
|
3135
CALL
Graco
GGG
$12.9B
| $310K | ﹤0.01% |
67
+25
| +60% | +$1.17K |
|
3136
CALL
Heron Therapeutics
HRTX
$86.3M
| $310K | ﹤0.01% |
98
-612
| -86% | -$22.8K |
|
3137
JB Hunt Transport Services
JBHT
$27.1B
| $310K | ﹤0.01% |
+2,608
| New | +$317K |
|
3138
PUT
Knight Transportation
KNX
$11.8B
| $310K | ﹤0.01% |
90
-164
| -65% | -$5.74K |
|
3139
PUT
Leggett & Platt
LEG
$1.52B
| $310K | ﹤0.01% |
71
+20
| +39% | +$899 |
|
3140
CALL
Middleby
MIDD
$6.05B
| $310K | ﹤0.01% |
24
+17
| +243% | +$1.94K |
|
3141
CALL
Plexus
PLXS
$6.81B
| $310K | ﹤0.01% |
53
-67
| -56% | -$4.1K |
|
3142
PUT
Sun Life Financial
SLF
$45.6B
| $310K | ﹤0.01% |
78
-8
| -9% | -$320 |
|
3143
Corpay
CPAY
$24.2B
| $310K | ﹤0.01% |
+1,362
| New | +$297K |
|
|
JBTM
3144
PUT
JBT Marel
JBTM
$7.14B
| $310K | ﹤0.01% |
26
+23
| +767% | +$2.5K |
|
3145
CALL
Diodes
DIOD
$4B
| $309K | ﹤0.01% |
93
+92
| +9,200% | +$3.33K |
|
|
GWR
3146
CALL
DELISTED
Genesee & Wyoming Inc.
GWR
| $309K | ﹤0.01% |
34
-1
| -3% | -$87 |
|
3147
1-800-Flowers.com
FLWS
$245M
| $308K | ﹤0.01% |
+26,114
| New | +$338K |
|
|
AL
3148
PUT
DELISTED
Air Lease Corp
AL
| $307K | ﹤0.01% |
67
-199
| -75% | -$8.87K |
|
3149
PUT
Atkore
ATKR
$2.59B
| $307K | ﹤0.01% |
+116
| New | +$2.9K |
|
3150
Popular Inc
BPOP
$11B
| $307K | ﹤0.01% |
+6,001
| New | +$299K |
|
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.