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 | |
|---|---|---|---|---|---|---|
726
PUT
Cheesecake Factory
CAKE
$4.23B
| $7.45M | 0.01% |
2,010
+41
| +2% | +$1.41K |
|
727
PUT
StoneCo
STNE
$2.67B
| $7.44M | 0.01% |
887
-1,768
| -67% | -$118K |
|
728
CALL
SAP
SAP
$170B
| $7.43M | 0.01% |
570
+288
| +102% | +$37.2K |
|
729
CALL
Royal Bank of Canada
RY
$289B
| $7.42M | 0.01% |
904
+130
| +17% | +$10.1K |
|
730
CALL
Under Armour Class C
UA
$2.84B
| $7.41M | 0.01% |
4,755
+398
| +9% | +$5.33K |
|
731
PUT
Intercontinental Exchange
ICE
$80.9B
| $7.38M | 0.01% |
640
+295
| +86% | +$30.6K |
|
732
CALL
Toyota
TM
$209B
| $7.37M | 0.01% |
477
+312
| +189% | +$43.6K |
|
733
PUT
Riot Platforms
RIOT
$9.17B
| $7.35M | 0.01% |
+4,327
| New | +$28.8K |
|
734
PUT
GDS Holdings
GDS
$6.39B
| $7.33M | 0.01% |
783
-336
| -30% | -$29.8K |
|
735
PUT
Akamai
AKAM
$17.5B
| $7.32M | 0.01% |
697
+248
| +55% | +$26K |
|
736
CALL
Stratasys
SSYS
$691M
| $7.31M | 0.01% |
3,528
+3,106
| +736% | +$49.8K |
|
737
PUT
Ubiquiti
UI
$32B
| $7.3M | 0.01% |
262
+134
| +105% | +$30.8K |
|
738
CALL
Tencent Music
TME
$14.2B
| $7.29M | 0.01% |
3,790
+2,334
| +160% | +$37.9K |
|
739
PUT
Digital Realty Trust
DLR
$66.7B
| $7.28M | 0.01% |
522
+61
| +13% | +$8.72K |
|
740
PUT
Alcoa
AA
$11.9B
| $7.27M | 0.01% |
3,156
+65
| +2% | +$1.13K |
|
741
PUT
Kraft Heinz
KHC
$30.2B
| $7.25M | 0.01% |
2,092
-447
| -18% | -$14.5K |
|
742
Bristol-Myers Squibb
BMY
$126B
| $7.24M | 0.01% |
116,736
+94,467
| +424% | +$5.81M |
|
|
743
PUT
Under Armour Class C
UA
$2.84B
| $7.24M | 0.01% |
4,435
+1,663
| +60% | +$22.3K |
|
744
PUT
Dell
DELL
$284B
| $7.23M | 0.01% |
1,945
+171
| +10% | +$5.96K |
|
745
TJX Companies
TJX
$169B
| $7.22M | 0.01% |
105,753
+34,501
| +48% | +$2.1M |
|
746
PUT
F5
FFIV
$22.1B
| $7.21M | 0.01% |
410
+151
| +58% | +$22.9K |
|
747
CALL
T. Rowe Price
TROW
$24.5B
| $7.21M | 0.01% |
476
+181
| +61% | +$25.9K |
|
748
CALL
Cadence Design Systems
CDNS
$91.9B
| $7.2M | 0.01% |
528
+467
| +766% | +$54.8K |
|
749
Southwest Airlines
LUV
$22.4B
| $7.19M | 0.01% |
154,183
-548
| -0.4% | -$23.7K |
|
750
CALL
ON Semiconductor
ON
$34.4B
| $7.15M | 0.01% |
2,186
-1,498
| -41% | -$41.8K |
|
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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.