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 | |
|---|---|---|---|---|---|---|
2051
PUT
Tucows
TCX
$97.1M
| $852K | ﹤0.01% |
153
+20
| +15% | +$1.15K |
|
2052
CALL
ManpowerGroup
MAN
$2.39B
| $851K | ﹤0.01% |
99
+3
| +3% | +$267 |
|
|
TBCH
2053
PUT
Turtle Beach Corp
TBCH
$239M
| $851K | ﹤0.01% |
427
+247
| +137% | +$6.09K |
|
2054
CALL
Ligand Pharmaceuticals
LGND
$6.02B
| $850K | ﹤0.01% |
50
+42
| +525% | +$6.33K |
|
2055
CALL
Rambus
RMBS
$10.4B
| $850K | ﹤0.01% |
780
+643
| +469% | +$7.82K |
|
2056
Vanguard Dividend Appreciation ETF
VIG
$111B
| $850K | ﹤0.01% |
+7,683
| New | +$826K |
|
2057
PUT
Avanos Medical
AVNS
$1.17B
| $849K | ﹤0.01% |
124
+84
| +210% | +$5.41K |
|
2058
CALL
Public Service Enterprise Group
PEG
$39.8B
| $849K | ﹤0.01% |
161
-107
| -40% | -$5.59K |
|
2059
PUT
Steel Dynamics
STLD
$35.6B
| $849K | ﹤0.01% |
188
+20
| +12% | +$921 |
|
2060
CALL
Cenovus Energy
CVE
$54.6B
| $847K | ﹤0.01% |
845
+725
| +604% | +$7.08K |
|
2061
PUT
Fastenal
FAST
$54B
| $847K | ﹤0.01% |
584
-528
| -47% | -$7.52K |
|
|
TCF
2062
PUT
DELISTED
TCF Financial Corporation
TCF
| $847K | ﹤0.01% |
356
+342
| +2,443% | +$8.67K |
|
|
ZGNX
2063
DELISTED
Zogenix, Inc.
ZGNX
| $846K | ﹤0.01% |
+17,068
| New | +$869K |
|
2064
PUT
Mattel
MAT
$4.17B
| $843K | ﹤0.01% |
537
+193
| +56% | +$3.09K |
|
2065
CALL
Children's Place
PLCE
$53.6M
| $843K | ﹤0.01% |
66
-160
| -71% | -$20.4K |
|
2066
PUT
Antero Resources
AR
$10.9B
| $842K | ﹤0.01% |
476
+376
| +376% | +$7.28K |
|
2067
Neurocrine Biosciences
NBIX
$17.7B
| $842K | ﹤0.01% |
6,853
-2,216
| -24% | -$251K |
|
2068
CALL
Signet Jewelers
SIG
$3.55B
| $837K | ﹤0.01% |
127
-247
| -66% | -$15.2K |
|
|
PDCE
2069
CALL
DELISTED
PDC Energy, Inc.
PDCE
| $837K | ﹤0.01% |
171
-192
| -53% | -$10.6K |
|
|
PRAH
2070
PUT
DELISTED
PRA Health Sciences, Inc.
PRAH
| $837K | ﹤0.01% |
76
-19
| -20% | -$1.98K |
|
|
VAR
2071
DELISTED
Varian Medical Systems, Inc.
VAR
| $837K | ﹤0.01% |
7,478
-3,727
| -33% | -$422K |
|
2072
PUT
Alkermes
ALKS
$8.82B
| $836K | ﹤0.01% |
197
-136
| -41% | -$5.9K |
|
2073
PUT
Euronet Worldwide
EEFT
$3.02B
| $831K | ﹤0.01% |
83
+62
| +295% | +$5.84K |
|
2074
PUT
Group 1 Automotive
GPI
$3.94B
| $830K | ﹤0.01% |
128
+94
| +276% | +$6.79K |
|
2075
CALL
Masco
MAS
$16B
| $830K | ﹤0.01% |
227
-75
| -25% | -$2.88K |
|
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.