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 | |
|---|---|---|---|---|---|---|
1701
PUT
Viper Energy
VNOM
$8.81B
| $1.21M | ﹤0.01% |
287
+131
| +84% | +$4.82K |
|
1702
Cheesecake Factory
CAKE
$4.21B
| $1.21M | ﹤0.01% |
22,534
+1,155
| +5% | +$62.4K |
|
|
CA
1703
PUT
DELISTED
CA, Inc.
CA
| $1.21M | ﹤0.01% |
273
+259
| +1,850% | +$11.2K |
|
1704
PUT
Camping World
CWH
$363M
| $1.2M | ﹤0.01% |
564
-646
| -53% | -$14.2K |
|
|
CDK
1705
PUT
DELISTED
CDK Global, Inc.
CDK
| $1.2M | ﹤0.01% |
192
+189
| +6,300% | +$12K |
|
|
SGI
1706
CALL
Somnigroup International
SGI
$15.1B
| $1.2M | ﹤0.01% |
908
+676
| +291% | +$9.02K |
|
1707
PUT
Insulet
PODD
$11.3B
| $1.2M | ﹤0.01% |
113
+99
| +707% | +$9.27K |
|
|
SAVE
1708
CALL
DELISTED
Spirit Airlines, Inc.
SAVE
| $1.2M | ﹤0.01% |
255
+186
| +270% | +$8.22K |
|
|
TCF
1709
CALL
DELISTED
TCF Financial Corporation
TCF
| $1.2M | ﹤0.01% |
503
+492
| +4,473% | +$12.5K |
|
|
MRTX
1710
CALL
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $1.2M | ﹤0.01% |
254
-4
| -2% | -$223 |
|
1711
PUT
Shutterstock
SSTK
$205M
| $1.2M | ﹤0.01% |
219
-45
| -17% | -$2.32K |
|
1712
PUT
Gibraltar Industries
ROCK
$1.34B
| $1.19M | ﹤0.01% |
262
+231
| +745% | +$9.99K |
|
1713
Carnival Corporation Ltd
CCL
$36.1B
| $1.19M | ﹤0.01% |
18,711
-25,761
| -58% | -$1.56M |
|
1714
PUT
Paychex
PAYX
$40.4B
| $1.19M | ﹤0.01% |
162
-271
| -63% | -$19.5K |
|
|
GOLD
1715
PUT
DELISTED
Randgold Resources Ltd
GOLD
| $1.19M | ﹤0.01% |
169
+95
| +128% | +$6.53K |
|
1716
Pacira BioSciences
PCRX
$1.02B
| $1.19M | ﹤0.01% |
24,183
+22,709
| +1,541% | +$982K |
|
|
SCG
1717
CALL
DELISTED
Scana
SCG
| $1.19M | ﹤0.01% |
305
-122
| -29% | -$4.68K |
|
1718
Yum! Brands
YUM
$41B
| $1.19M | ﹤0.01% |
13,044
-23
| -0.2% | -$1.92K |
|
1719
PUT
B&G Foods
BGS
$285M
| $1.18M | ﹤0.01% |
431
+216
| +100% | +$6.7K |
|
1720
PUT
MiMedx Group
MDXG
$626M
| $1.18M | ﹤0.01% |
1,914
+476
| +33% | +$2.15K |
|
1721
PUT
Nutrien
NTR
$32.7B
| $1.18M | ﹤0.01% |
205
-158
| -44% | -$8.75K |
|
1722
PUT
Ball Corp
BALL
$17B
| $1.18M | ﹤0.01% |
268
+130
| +94% | +$5.29K |
|
1723
PUT
Extra Space Storage
EXR
$31.2B
| $1.18M | ﹤0.01% |
136
-156
| -53% | -$14.5K |
|
1724
PUT
Evercore
EVR
$13.1B
| $1.18M | ﹤0.01% |
117
+3
| +3% | +$323 |
|
1725
PUT
SS&C Technologies
SSNC
$17.8B
| $1.18M | ﹤0.01% |
207
+7
| +4% | +$388 |
|
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.