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 | |
|---|---|---|---|---|---|---|
2701
CALL
Element Solutions
ESI
$9.12B
| $468K | ﹤0.01% |
376
+373
| +12,433% | +$4.66K |
|
2702
CALL
SFL Corp
SFL
$1.59B
| $468K | ﹤0.01% |
337
-146
| -30% | -$2.1K |
|
|
PTLA
2703
DELISTED
Portola Pharmaceuticals, Inc.
PTLA
| $468K | ﹤0.01% |
17,577
+1,215
| +7% | +$39.7K |
|
2704
ManpowerGroup
MAN
$2.39B
| $467K | ﹤0.01% |
+5,439
| New | +$484K |
|
2705
CALL
Old Dominion Freight Line
ODFL
$48.5B
| $467K | ﹤0.01% |
87
-192
| -69% | -$9.72K |
|
2706
Wabtec
WAB
$51.1B
| $467K | ﹤0.01% |
+4,459
| New | +$481K |
|
|
STI
2707
DELISTED
SunTrust Banks, Inc.
STI
| $467K | ﹤0.01% |
7,007
+2,779
| +66% | +$198K |
|
|
CASA
2708
CALL
DELISTED
Casa Systems, Inc. Common Stock
CASA
| $466K | ﹤0.01% |
316
-38
| -11% | -$578 |
|
2709
PUT
ProShares UltraShort Industrials
SIJ
$5.74M
| $465K | ﹤0.01% |
23
+7
| +44% | +$1.7K |
|
|
GLOP
2710
CALL
DELISTED
GASLOG PARTNERS LP
GLOP
| $465K | ﹤0.01% |
186
-120
| -39% | -$2.93K |
|
2711
CALL
Trupanion
TRUP
$1.05B
| $464K | ﹤0.01% |
130
+124
| +2,067% | +$4.79K |
|
2712
CALL
Tyson Foods
TSN
$20.2B
| $464K | ﹤0.01% |
78
-199
| -72% | -$12.4K |
|
|
SEND
2713
DELISTED
SendGrid, Inc.
SEND
| $464K | ﹤0.01% |
12,639
+1,083
| +9% | +$34.2K |
|
2714
CALL
Cogent Communications
CCOI
$594M
| $463K | ﹤0.01% |
83
+25
| +43% | +$1.34K |
|
2715
Under Armour Class C
UA
$2.92B
| $463K | ﹤0.01% |
+23,836
| New | +$460K |
|
|
NS
2716
CALL
DELISTED
NuStar Energy L.P.
NS
| $463K | ﹤0.01% |
167
+37
| +28% | +$980 |
|
2717
CALL
CNX Resources
CNX
$4.85B
| $462K | ﹤0.01% |
410
+137
| +50% | +$2.17K |
|
2718
Regions Financial
RF
$26.3B
| $462K | ﹤0.01% |
25,230
-118,905
| -82% | -$2.24M |
|
2719
PUT
Aon
AON
$77.3B
| $461K | ﹤0.01% |
30
-111
| -79% | -$16.2K |
|
|
SFLY
2720
DELISTED
Shutterfly, Inc.
SFLY
| $461K | ﹤0.01% |
7,005
+5,914
| +542% | +$468K |
|
|
MASI
2721
CALL
DELISTED
Masimo
MASI
| $460K | ﹤0.01% |
37
+31
| +517% | +$3.44K |
|
2722
Aecom
ACM
$9.07B
| $459K | ﹤0.01% |
+14,070
| New | +$464K |
|
2723
CALL
Infosys
INFY
$45B
| $459K | ﹤0.01% |
452
-24
| -5% | -$244 |
|
2724
CALL
Limoneira
LMNR
$237M
| $459K | ﹤0.01% |
176
+152
| +633% | +$4.23K |
|
2725
PUT
JetBlue
JBLU
$1.96B
| $458K | ﹤0.01% |
237
-46
| -16% | -$872 |
|
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.