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 | |
|---|---|---|---|---|---|---|
2626
Factset
FDS
$9.05B
| $502K | ﹤0.01% |
2,245
-4,532
| -67% | -$983K |
|
2627
Fabrinet
FN
$17.1B
| $502K | ﹤0.01% |
10,869
+8,622
| +384% | +$370K |
|
2628
PUT
Cirrus Logic
CRUS
$6.74B
| $501K | ﹤0.01% |
130
-11
| -8% | -$457 |
|
|
DNKN
2629
CALL
DELISTED
Dunkin' Brands Group, Inc.
DNKN
| $501K | ﹤0.01% |
68
+24
| +55% | +$1.73K |
|
2630
Hyatt Hotels
H
$17.6B
| $499K | ﹤0.01% |
6,272
-3,615
| -37% | -$284K |
|
2631
NewMarket
NEU
$7.17B
| $499K | ﹤0.01% |
1,232
+269
| +28% | +$108K |
|
2632
Cracker Barrel
CBRL
$1.2B
| $498K | ﹤0.01% |
+3,389
| New | +$508K |
|
2633
Extra Space Storage
EXR
$31.2B
| $498K | ﹤0.01% |
5,756
+4,693
| +441% | +$436K |
|
|
CY
2634
DELISTED
Cypress Semiconductor
CY
| $496K | ﹤0.01% |
34,276
+20,336
| +146% | +$335K |
|
2635
CALL
IMAX
IMAX
$2.38B
| $495K | ﹤0.01% |
192
+77
| +67% | +$1.81K |
|
2636
CALL
Xylem
XYL
$28.5B
| $495K | ﹤0.01% |
62
-69
| -53% | -$5.15K |
|
2637
PUT
Chegg
CHGG
$108M
| $494K | ﹤0.01% |
174
+161
| +1,238% | +$4.8K |
|
2638
Copart
CPRT
$25.9B
| $494K | ﹤0.01% |
+38,360
| New | +$573K |
|
2639
PUT
Designer Brands
DBI
$277M
| $494K | ﹤0.01% |
146
-105
| -42% | -$3.07K |
|
2640
Kratos Defense & Security Solutions
KTOS
$8.88B
| $494K | ﹤0.01% |
33,443
+30,837
| +1,183% | +$407K |
|
2641
CALL
Unilever
UL
$131B
| $494K | ﹤0.01% |
80
+10
| +14% | +$631 |
|
2642
CALL
Vistra
VST
$55.1B
| $494K | ﹤0.01% |
199
+31
| +18% | +$713 |
|
|
ESPR
2643
CALL
DELISTED
Esperion Therapeutics
ESPR
| $492K | ﹤0.01% |
111
-28
| -20% | -$1.28K |
|
|
BECN
2644
PUT
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $492K | ﹤0.01% |
136
+110
| +423% | +$4.36K |
|
|
NTRI
2645
PUT
DELISTED
NutriSystem, Inc.
NTRI
| $492K | ﹤0.01% |
133
-13
| -9% | -$503 |
|
2646
PUT
Arch Capital
ACGL
$36.1B
| $491K | ﹤0.01% |
165
-567
| -77% | -$16.9K |
|
2647
CALL
InfraCap MLP ETF
AMZA
$471M
| $491K | ﹤0.01% |
66
+29
| +78% | +$2.24K |
|
2648
Hexcel
HXL
$8.32B
| $491K | ﹤0.01% |
7,327
-2,328
| -24% | -$158K |
|
|
VNET
2649
CALL
VNET Group
VNET
$2.05B
| $490K | ﹤0.01% |
486
+383
| +372% | +$3.74K |
|
|
ADMS
2650
PUT
DELISTED
Adamas Pharmaceuticals
ADMS
| $490K | ﹤0.01% |
+245
| New | +$5.75K |
|
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.