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 | |
|---|---|---|---|---|---|---|
4051
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$225M
| $141K | ﹤0.01% |
36
-19
| -35% | -$70.5K |
|
4052
Ooma
OOMA
$608M
| $141K | ﹤0.01% |
+8,541
| New | +$137K |
|
4053
Verisk Analytics
VRSK
$27.8B
| $141K | ﹤0.01% |
+1,171
| New | +$136K |
|
|
GTLS
4054
CALL
DELISTED
Chart Industries
GTLS
| $140K | ﹤0.01% |
18
+10
| +125% | +$740 |
|
4055
Main Street Capital
MAIN
$5.14B
| $140K | ﹤0.01% |
+3,657
| New | +$145K |
|
4056
CALL
MSC Industrial Direct
MSM
$6.97B
| $140K | ﹤0.01% |
16
-9
| -36% | -$768 |
|
4057
Ocular Therapeutix
OCUL
$1.85B
| $140K | ﹤0.01% |
+20,452
| New | +$128K |
|
4058
Pilgrim's Pride
PPC
$7.09B
| $140K | ﹤0.01% |
+7,765
| New | +$144K |
|
4059
Gentherm
THRM
$1.29B
| $140K | ﹤0.01% |
3,089
-7,340
| -70% | -$333K |
|
4060
Twilio
TWLO
$29.5B
| $140K | ﹤0.01% |
1,632
-49,060
| -97% | -$3.59M |
|
4061
PUT
TherapeuticsMD
TXMD
$23.8M
| $140K | ﹤0.01% |
4
+1
| +33% | +$306 |
|
4062
PUT
WEC Energy
WEC
$37B
| $140K | ﹤0.01% |
21
+17
| +425% | +$1.13K |
|
4063
Xerox
XRX
$360M
| $140K | ﹤0.01% |
5,225
-34,769
| -87% | -$920K |
|
|
XIFR
4064
PUT
XPLR Infrastructure LP
XIFR
$1.11B
| $140K | ﹤0.01% |
29
-20
| -41% | -$950 |
|
|
ALDR
4065
DELISTED
Alder Biopharmaceuticals
ALDR
| $140K | ﹤0.01% |
8,409
-4,205
| -33% | -$76K |
|
|
YELL
4066
CALL
DELISTED
Yellow Corporation Common Stock
YELL
| $140K | ﹤0.01% |
157
+43
| +38% | +$417 |
|
|
ARR
4067
PUT
Armour Residential REIT
ARR
$2.32B
| $139K | ﹤0.01% |
12
+10
| +500% | +$1.17K |
|
4068
CALL
Black Hills Corp
BKH
$5.69B
| $139K | ﹤0.01% |
24
-6
| -20% | -$360 |
|
4069
e.l.f. Beauty
ELF
$4.96B
| $139K | ﹤0.01% |
+10,931
| New | +$150K |
|
4070
PUT
Freshpet
FRPT
$3.01B
| $139K | ﹤0.01% |
+38
| New | +$1.25K |
|
4071
PUT
KeyCorp
KEY
$24.3B
| $139K | ﹤0.01% |
70
-39
| -36% | -$810 |
|
|
SA
4072
CALL
Seabridge Gold
SA
$2.69B
| $139K | ﹤0.01% |
108
+103
| +2,060% | +$1.19K |
|
4073
W&T Offshore
WTI
$473M
| $139K | ﹤0.01% |
14,479
-49,693
| -77% | -$360K |
|
|
ACGN
4074
CALL
DELISTED
Aceragen Inc
ACGN
| $139K | ﹤0.01% |
9
+8
| +800% | +$1.14K |
|
|
CLD
4075
DELISTED
Cloud Peak Energy Inc
CLD
| $139K | ﹤0.01% |
60,616
+31,093
| +105% | +$83.6K |
|
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.