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 | |
|---|---|---|---|---|---|---|
2101
Aldeyra Therapeutics
ALDX
$91.7M
| $810K | ﹤0.01% |
58,745
+55,767
| +1,873% | +$452K |
|
2102
CALL
AAR Corp
AIR
$5.15B
| $809K | ﹤0.01% |
169
+130
| +333% | +$5.97K |
|
2103
Ionis Pharmaceuticals
IONS
$9.35B
| $809K | ﹤0.01% |
15,689
+10,674
| +213% | +$501K |
|
2104
International Paper
IP
$22.3B
| $809K | ﹤0.01% |
+17,400
| New | +$863K |
|
2105
CALL
Service Corp International
SCI
$11.4B
| $808K | ﹤0.01% |
183
-1
| -0.5% | -$40 |
|
|
ARNA
2106
PUT
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $805K | ﹤0.01% |
175
-41
| -19% | -$1.66K |
|
2107
PUT
Popular Inc
BPOP
$11B
| $804K | ﹤0.01% |
157
-26
| -14% | -$1.3K |
|
2108
PUT
Jack in the Box
JACK
$278M
| $804K | ﹤0.01% |
96
-256
| -73% | -$22.1K |
|
2109
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $803K | ﹤0.01% |
102
+20
| +24% | +$1.57K |
|
2110
PUT
Diodes
DIOD
$4B
| $802K | ﹤0.01% |
241
+239
| +11,950% | +$8.64K |
|
2111
CALL
Ascendis Pharma A/S
ASND
$16.7B
| $800K | ﹤0.01% |
113
+110
| +3,667% | +$7.57K |
|
2112
CALL
Assurant
AIZ
$13.7B
| $798K | ﹤0.01% |
74
-66
| -47% | -$6.99K |
|
2113
PUT
Polaris
PII
$4.15B
| $797K | ﹤0.01% |
79
+6
| +8% | +$670 |
|
2114
PUT
Ashland
ASH
$3.04B
| $796K | ﹤0.01% |
95
-144
| -60% | -$12K |
|
2115
Ralph Lauren
RL
$22.2B
| $795K | ﹤0.01% |
5,781
-2,362
| -29% | -$315K |
|
|
ZAYO
2116
CALL
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $795K | ﹤0.01% |
229
-277
| -55% | -$10.1K |
|
2117
PUT
iShares Silver Trust
SLV
$28.1B
| $794K | ﹤0.01% |
579
-79
| -12% | -$1.11K |
|
2118
PUT
BlackBerry
BB
$5.01B
| $793K | ﹤0.01% |
697
+414
| +146% | +$4.23K |
|
2119
CALL
H&R Block
HRB
$5.18B
| $793K | ﹤0.01% |
308
+27
| +10% | +$685 |
|
2120
RPM International
RPM
$13.7B
| $793K | ﹤0.01% |
+12,216
| New | +$787K |
|
2121
CALL
Crown Holdings
CCK
$12.8B
| $792K | ﹤0.01% |
165
+51
| +45% | +$2.27K |
|
2122
CALL
Viasat
VSAT
$9.79B
| $792K | ﹤0.01% |
124
+106
| +589% | +$6.98K |
|
|
AVLR
2123
CALL
DELISTED
Avalara, Inc.
AVLR
| $792K | ﹤0.01% |
+227
| New | +$9.4K |
|
|
FLIR
2124
PUT
DELISTED
FLIR Systems, Inc. (DE) Common Stock
FLIR
| $792K | ﹤0.01% |
129
-2
| -2% | -$118 |
|
2125
CALL
Lincoln National
LNC
$7.91B
| $791K | ﹤0.01% |
117
-52
| -31% | -$3.43K |
|
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.