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 | |
|---|---|---|---|---|---|---|
8226
ABM Industries
ABM
$2.8B
| – | – |
-16,584
| Closed | -$628K |
|
8227
CALL
Abbott
ABT
$180B
| – | – |
-3,666
| Closed | -$39.9M |
|
|
8228
PUT
Abbott
ABT
$180B
| – | – |
-3,366
| Closed | -$36.6M |
|
8229
Acadia Pharmaceuticals
ACAD
$4.25B
| $0 | ﹤0.01% |
21,618
-427
| -2% | -$21.2K |
|
8230
Arch Capital
ACGL
$36.1B
| – | – |
-4,659
| Closed | -$153K |
|
8231
CALL
Adicet Bio
ACET
$72.8M
| – | – |
-3
| Closed | -$47K |
|
8232
AC Immune
ACIU
$227M
| – | – |
-8,821
| Closed | – |
|
8233
ACI Worldwide
ACIW
$5.72B
| – | – |
-7,422
| Closed | -$249K |
|
8234
ACM Research
ACMR
$5.83B
| – | – |
-90,309
| Closed | -$2.31M |
|
8235
Accenture
ACN
$89.9B
| – | – |
-5,150
| Closed | -$1.23M |
|
|
ACR
8236
ACRES Commercial Realty
ACR
$126M
| – | – |
-415
| Closed | -$3.71K |
|
8237
iShares MSCI Global Min Vol Factor ETF
ACWV
$3.26B
| – | – |
-201
| Closed | -$18K |
|
8238
Adobe
ADBE
$89.5B
| – | – |
-5,896
| Closed | -$2.85M |
|
8239
CALL
ADC Therapeutics
ADCT
$146M
| – | – |
-1
| Closed | -$3K |
|
8240
Adeia
ADEA
$2.86B
| $0 | ﹤0.01% |
33,574
+5,681
| +20% | +$24.6K |
|
8241
ADMA Biologics
ADMA
$1.92B
| – | – |
-414
| Closed | -$870 |
|
8242
Adtran
ADTN
$798M
| – | – |
-5,511
| Closed | -$70K |
|
8243
AES
AES
$10.6B
| – | – |
-20,713
| Closed | -$430K |
|
8244
First Majestic Silver
AG
$8.05B
| $0 | ﹤0.01% |
22,130
-87,386
| -80% | -$961K |
|
8245
AGCO
AGCO
$8.78B
| – | – |
-5,583
| Closed | -$496K |
|
8246
Argan
AGX
$7.98B
| – | – |
-100
| Closed | -$4.49K |
|
8247
CALL
Agilysys
AGYS
$2.78B
| – | – |
-5
| Closed | -$12K |
|
|
8248
Agilysys
AGYS
$2.78B
| – | – |
-2,426
| Closed | -$58K |
|
|
AIV
8249
Aimco
AIV
$380M
| $0 | ﹤0.01% |
50
-1,894
| -97% | -$8.41K |
|
8250
Assurant
AIZ
$13.7B
| – | – |
-75
| Closed | -$9.71K |
|
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.