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 | Miscellaneous | 95.2% |
| 2 | Consumer Discretionary | 1.14% |
| 3 | Communication Services | 0.9% |
| 4 | Technology | 0.69% |
| 5 | Industrials | 0.52% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1626
Stellantis
STLA
$16.1B
| $1.29M | ﹤0.01% |
73,946
-51,426
| -41% | -$909K |
|
|
CCMP
1627
PUT
DELISTED
CMC Materials, Inc. Common Stock
CCMP
| $1.29M | ﹤0.01% |
125
+101
| +421% | +$11.4K |
|
1628
PUT
Oceaneering
OII
$5.12B
| $1.29M | ﹤0.01% |
466
-15
| -3% | -$400 |
|
1629
Pinduoduo
PDD
$117B
| $1.29M | ﹤0.01% |
+48,929
| New | +$1.06M |
|
1630
PUT
SM Energy
SM
$8.67B
| $1.29M | ﹤0.01% |
408
-140
| -26% | -$4.02K |
|
1631
Trip.com Group
TCOM
$25.8B
| $1.29M | ﹤0.01% |
34,599
-44,130
| -56% | -$1.79M |
|
1632
CALL
Core Laboratories
CLB
$575M
| $1.28M | ﹤0.01% |
111
+73
| +192% | +$8.24K |
|
1633
PUT
Illinois Tool Works
ITW
$76.9B
| $1.28M | ﹤0.01% |
91
+61
| +203% | +$8.6K |
|
1634
Cars.com
CARS
$628M
| $1.28M | ﹤0.01% |
46,489
+23,592
| +103% | +$659K |
|
|
EGN
1635
PUT
DELISTED
Energen
EGN
| $1.28M | ﹤0.01% |
149
+72
| +94% | +$5.48K |
|
1636
iShares MSCI South Korea ETF
EWY
$28.8B
| $1.28M | ﹤0.01% |
18,793
-30,585
| -62% | -$2.02M |
|
1637
CALL
PACCAR
PCAR
$65.6B
| $1.28M | ﹤0.01% |
282
-314
| -53% | -$13.9K |
|
|
UNIT
1638
PUT
Uniti Group
UNIT
$2.47B
| $1.28M | ﹤0.01% |
636
+329
| +107% | +$6.51K |
|
1639
PUT
Sysco
SYY
$38.4B
| $1.27M | ﹤0.01% |
174
+27
| +18% | +$1.95K |
|
|
SYNT
1640
CALL
DELISTED
Syntel Inc
SYNT
| $1.27M | ﹤0.01% |
311
+236
| +315% | +$9.44K |
|
1641
CALL
Extra Space Storage
EXR
$29.4B
| $1.27M | ﹤0.01% |
147
+134
| +1,031% | +$12.4K |
|
1642
CALL
Cencora
COR
$63.2B
| $1.27M | ﹤0.01% |
138
-65
| -32% | -$5.62K |
|
1643
PUT
Dominion Energy
D
$57.9B
| $1.27M | ﹤0.01% |
181
-818
| -82% | -$57.9K |
|
1644
CALL
Edison International
EIX
$21.8B
| $1.27M | ﹤0.01% |
188
+78
| +71% | +$5.22K |
|
|
CBPO
1645
CALL
DELISTED
China Biologic Products Holdings, Inc.
CBPO
| $1.27M | ﹤0.01% |
159
+17
| +12% | +$1.58K |
|
1646
CALL
ON Semiconductor
ON
$29B
| $1.27M | ﹤0.01% |
690
-98
| -12% | -$2.1K |
|
1647
CALL
Insulet
PODD
$10.2B
| $1.27M | ﹤0.01% |
120
+81
| +208% | +$7.58K |
|
1648
ProShares UltraShort S&P500
SDS
$382M
| $1.27M | ﹤0.01% |
+1,536
| New | +$1.34M |
|
1649
CALL
Green Dot
GDOT
$760M
| $1.27M | ﹤0.01% |
143
+80
| +127% | +$6.65K |
|
1650
Kohl's
KSS
$2.2B
| $1.27M | ﹤0.01% |
+17,044
| New | +$1.29M |
|
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, 2,754 reduced and 1,316 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 Miscellaneous at 95% of assets, up from 94% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- 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 1,316 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.