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 |
Alibaba
BABA
|
+$39.9M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$39M |
| 3 |
Mastercard
MA
|
+$31.3M |
| 4 |
Apple
AAPL
|
+$25.3M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$25.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
JPMorgan Chase
JPM
|
+$52.8M |
| 2 |
TSMC
TSM
|
+$43M |
| 3 |
Amazon
AMZN
|
+$24.7M |
| 4 |
iShares Silver Trust
SLV
|
+$24.2M |
| 5 |
Netflix
NFLX
|
+$21.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.65% |
| 2 | Technology | 0.37% |
| 3 | Healthcare | 0.33% |
| 4 | Industrials | 0.21% |
| 5 | Communication Services | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1726
Regenxbio
RGNX
$623M
| $2.12M | ﹤0.01% |
46,632
+46,036
| +7,724% | +$1.61M |
|
1727
PUT
KeyCorp
KEY
$24.3B
| $2.11M | ﹤0.01% |
1,287
+941
| +272% | +$13.7K |
|
|
ONIT
1728
PUT
Onity Group
ONIT
$333M
| $2.11M | ﹤0.01% |
730
-405
| -36% | -$10.3K |
|
1729
CALL
Rambus
RMBS
$10.4B
| $2.11M | ﹤0.01% |
1,207
+522
| +76% | +$8.19K |
|
|
USCR
1730
CALL
DELISTED
U S Concrete, Inc.
USCR
| $2.11M | ﹤0.01% |
527
-408
| -44% | -$14.5K |
|
1731
CALL
Keurig Dr Pepper
KDP
$40.4B
| $2.1M | ﹤0.01% |
658
+415
| +171% | +$12.3K |
|
1732
CALL
Vodafone
VOD
$34.9B
| $2.1M | ﹤0.01% |
1,274
-2,355
| -65% | -$36.9K |
|
1733
CALL
Broadridge
BR
$17.2B
| $2.1M | ﹤0.01% |
137
+94
| +219% | +$13.6K |
|
1734
PUT
Green Dot
GDOT
$753M
| $2.1M | ﹤0.01% |
376
+233
| +163% | +$13.2K |
|
1735
Digital Realty Trust
DLR
$73.7B
| $2.1M | ﹤0.01% |
+15,027
| New | +$2.15M |
|
|
SIVB
1736
CALL
DELISTED
SVB Financial Group
SIVB
| $2.09M | ﹤0.01% |
54
-32
| -37% | -$10.4K |
|
1737
PUT
Burlington
BURL
$22B
| $2.09M | ﹤0.01% |
80
-135
| -63% | -$30.1K |
|
|
CMPS
1738
CALL
Compass Pathways
CMPS
$1.52B
| $2.09M | ﹤0.01% |
+439
| New | +$18.7K |
|
1739
CALL
Dentsply Sirona
XRAY
$2.59B
| $2.09M | ﹤0.01% |
399
-465
| -54% | -$22.9K |
|
1740
PUT
Tenaris
TS
$29.1B
| $2.09M | ﹤0.01% |
+1,308
| New | +$17.4K |
|
1741
CALL
AvalonBay Communities
AVB
$27.1B
| $2.08M | ﹤0.01% |
130
-204
| -61% | -$32.4K |
|
1742
PUT
Exelon
EXC
$48.6B
| $2.08M | ﹤0.01% |
691
+111
| +19% | +$3.28K |
|
1743
CALL
Louisiana-Pacific
LPX
$5.2B
| $2.08M | ﹤0.01% |
560
+176
| +46% | +$5.89K |
|
1744
CALL
Targa Resources
TRGP
$60.4B
| $2.08M | ﹤0.01% |
789
-912
| -54% | -$19.4K |
|
1745
CALL
Stanley Black & Decker
SWK
$14.2B
| $2.07M | ﹤0.01% |
116
+16
| +16% | +$2.84K |
|
1746
BioNTech
BNTX
$22.6B
| $2.07M | ﹤0.01% |
+25,369
| New | +$2.49M |
|
1747
PUT
APA Corp
APA
$12.8B
| $2.07M | ﹤0.01% |
1,457
-1,130
| -44% | -$13.2K |
|
|
XLNX
1748
DELISTED
Xilinx Inc
XLNX
| $2.07M | ﹤0.01% |
14,587
+14,087
| +2,817% | +$1.83M |
|
|
MNDT
1749
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $2.06M | ﹤0.01% |
89,519
-10,198
| -10% | -$157K |
|
1750
CALL
iRhythm Holdings
IRTC
$3.59B
| $2.06M | ﹤0.01% |
87
+6
| +7% | +$1.37K |
|
Similar funds
Simplex Trading's Q4 2020 Portfolio in Review
As of Q4 2020, Simplex Trading held 9,568 positions worth $77.2B, up 5% from $73.5B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading's Q4 2020 filing shows 1,711 new, 3,402 increased, 3,106 reduced and 1,157 closed positions. Its largest new stake was Alibaba: 143,630 shares worth $33.4M. The largest sale was JPMorgan Chase, an estimated $52.8M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.65% of assets, up from 0.53% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q4 2020 buy was Alibaba: 143,630 shares worth $33.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q4 2020, an estimated $39M increase.
- Simplex Trading's biggest Q4 2020 reduction was JPMorgan Chase, cutting an estimated $52.8M.
- Simplex Trading fully exited Target in Q4 2020, selling an estimated $14.3M.
- Simplex Trading's ten largest holdings make up 42% of its $77.2B portfolio in Q4 2020.
- Simplex Trading opened 1,711 new positions and closed 1,157 in Q4 2020.
- Simplex Trading's portfolio value rose 5% quarter-over-quarter to $77.2B.
Based on Simplex Trading's 13F filing for Q4 2020, filed 2 Feb 2021.