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 | |
|---|---|---|---|---|---|---|
376
PUT
Elevance Health
ELV
$84.4B
| $18.6M | 0.02% |
579
+195
| +51% | +$59.8K |
|
377
CALL
Best Buy
BBY
$18.4B
| $18.5M | 0.02% |
1,854
+620
| +50% | +$69.3K |
|
378
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $18.3M | 0.02% |
436
+235
| +117% | +$90.5K |
|
379
CALL
DuPont de Nemours
DD
$18.9B
| $18.1M | 0.02% |
2,120
+161
| +8% | +$12.6K |
|
380
CALL
BP
BP
$112B
| $18M | 0.02% |
8,782
+2,645
| +43% | +$49.8K |
|
381
PUT
Western Digital
WDC
$192B
| $18M | 0.02% |
4,293
-2,281
| -35% | -$75.7K |
|
382
CALL
ASML
ASML
$692B
| $17.9M | 0.02% |
368
+131
| +55% | +$55.1K |
|
383
CALL
Southwest Airlines
LUV
$23.3B
| $17.8M | 0.02% |
3,820
-1,492
| -28% | -$64.6K |
|
384
CALL
BioMarin Pharmaceuticals
BMRN
$11.3B
| $17.8M | 0.02% |
2,027
+1,019
| +101% | +$80.8K |
|
385
PUT
Crown Castle
CCI
$33.8B
| $17.7M | 0.02% |
1,114
+594
| +114% | +$96.4K |
|
386
CALL
Kohl's
KSS
$2.16B
| $17.7M | 0.02% |
4,348
+2,714
| +166% | +$78.9K |
|
387
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $17.6M | 0.02% |
365
+134
| +58% | +$72.3K |
|
388
CALL
Capital One
COF
$124B
| $17.6M | 0.02% |
1,783
-1,493
| -46% | -$127K |
|
389
CALL
SLB Ltd
SLB
$71.3B
| $17.6M | 0.02% |
8,069
+3,961
| +96% | +$74.7K |
|
390
PUT
Arista Networks
ANET
$220B
| $17.6M | 0.02% |
9,696
+1,536
| +19% | +$24.3K |
|
391
PUT
CSX Corp
CSX
$92.8B
| $17.6M | 0.02% |
5,814
+3,003
| +107% | +$86.3K |
|
392
State Street Utilities Select Sector SPDR ETF
XLU
$23.9B
| $17.6M | 0.02% |
560,044
+285,282
| +104% | +$9.03M |
|
393
XPeng
XPEV
$12.3B
| $17.4M | 0.02% |
406,271
+361,601
| +809% | +$13.3M |
|
394
Meta Platforms (Facebook)
META
$1.59T
| $17.2M | 0.02% |
63,140
-20,574
| -25% | -$5.64M |
|
395
CALL
T-Mobile US
TMUS
$207B
| $17.2M | 0.02% |
1,272
+130
| +11% | +$16.1K |
|
396
CALL
American Tower
AMT
$77.4B
| $17.1M | 0.02% |
764
-152
| -17% | -$35.3K |
|
397
PUT
Analog Devices
ADI
$188B
| $17.1M | 0.02% |
1,159
+362
| +45% | +$48K |
|
|
KFYP
398
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $17M | 0.02% |
2,216
-1,843
| -45% | -$58.2K |
|
399
PUT
SolarEdge
SEDG
$2.91B
| $16.9M | 0.02% |
531
-272
| -34% | -$75.2K |
|
400
CALL
Palo Alto Networks
PANW
$273B
| $16.9M | 0.02% |
2,856
-2,514
| -47% | -$117K |
|
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.