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 | |
|---|---|---|---|---|---|---|
1151
CALL
Dropbox
DBX
$6.63B
| $2.25M | 0.01% |
840
-75
| -8% | -$2.17K |
|
1152
CALL
Under Armour Class C
UA
$2.81B
| $2.25M | 0.01% |
1,099
-1,344
| -55% | -$25.9K |
|
1153
CALL
Eagle Materials
EXP
$6.4B
| $2.25M | 0.01% |
264
+166
| +169% | +$16.1K |
|
|
RDS.A
1154
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $2.25M | 0.01% |
33,007
+31,850
| +2,753% | +$2.13M |
|
|
MOMO
1155
Hello Group
MOMO
$870M
| $2.25M | 0.01% |
51,325
-4,809
| -9% | -$210K |
|
1156
PUT
Wabtec
WAB
$50.3B
| $2.24M | 0.01% |
214
+173
| +422% | +$18.6K |
|
1157
MongoDB
MDB
$24.1B
| $2.24M | 0.01% |
27,511
+27,335
| +15,531% | +$1.82M |
|
1158
CALL
KeyCorp
KEY
$24.4B
| $2.24M | 0.01% |
1,127
+697
| +162% | +$14.5K |
|
1159
PUT
News Corp Class B
NWS
$16.1B
| $2.24M | 0.01% |
1,699
+1,684
| +11,227% | +$24.2K |
|
1160
CALL
Keysight
KEYS
$55.6B
| $2.23M | 0.01% |
337
+9
| +3% | +$558 |
|
1161
CALL
United States Oil Fund
USO
$2.5B
| $2.23M | 0.01% |
180
+80
| +80% | +$9.24K |
|
1162
PUT
Galicia Financial Group
GGAL
$8.06B
| $2.23M | 0.01% |
877
+669
| +322% | +$20.2K |
|
1163
PUT
Blackbaud
BLKB
$1.44B
| $2.22M | 0.01% |
219
-69
| -24% | -$7.2K |
|
1164
PUT
Ambarella
AMBA
$3.09B
| $2.22M | 0.01% |
574
+322
| +128% | +$12.5K |
|
1165
PUT
International Paper
IP
$20.1B
| $2.22M | 0.01% |
476
-25
| -5% | -$1.24K |
|
1166
CALL
NOV
NOV
$7.22B
| $2.21M | 0.01% |
514
+196
| +62% | +$8.77K |
|
|
FNSR
1167
PUT
DELISTED
Finisar Corp
FNSR
| $2.21M | 0.01% |
1,162
-738
| -39% | -$13.7K |
|
1168
CALL
CarMax
KMX
$8.29B
| $2.21M | 0.01% |
296
+15
| +5% | +$1.14K |
|
1169
PUT
Kirby Corp
KEX
$7.97B
| $2.2M | 0.01% |
268
+192
| +253% | +$16.1K |
|
1170
CALL
Five Below
FIVE
$11.1B
| $2.2M | 0.01% |
169
+11
| +7% | +$1.22K |
|
|
ENDP
1171
CALL
DELISTED
Endo International plc
ENDP
| $2.2M | 0.01% |
1,305
+117
| +10% | +$1.66K |
|
1172
Intel
INTC
$504B
| $2.19M | 0.01% |
+46,382
| New | +$2.26M |
|
|
JNPR
1173
PUT
DELISTED
Juniper Networks
JNPR
| $2.19M | 0.01% |
732
-10
| -1% | -$279 |
|
|
GAP
1174
CALL
The Gap Inc
GAP
$6.8B
| $2.19M | 0.01% |
760
+85
| +13% | +$2.55K |
|
|
EVHC
1175
PUT
DELISTED
Envision Healthcare Holdings Inc
EVHC
| $2.19M | 0.01% |
479
-195
| -29% | -$8.76K |
|
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.