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 | |
|---|---|---|---|---|---|---|
4301
CALL
Amkor Technology
AMKR
$11.1B
| $251K | ﹤0.01% |
167
+44
| +36% | +$599 |
|
4302
AutoNation
AN
$7.81B
| $251K | ﹤0.01% |
+3,607
| New | +$227K |
|
4303
PUT
Honda
HMC
$40.1B
| $251K | ﹤0.01% |
89
-88
| -50% | -$2.38K |
|
4304
PUT
Iridium Communications
IRDM
$4.77B
| $251K | ﹤0.01% |
64
-48
| -43% | -$1.51K |
|
|
CALA
4305
DELISTED
Calithera Biosciences, Inc
CALA
| $251K | ﹤0.01% |
+2,562
| New | +$225K |
|
4306
CALL
Angi Inc
ANGI
$254M
| $250K | ﹤0.01% |
19
-168
| -90% | -$19.5K |
|
4307
PUT
Gaia
GAIA
$47.1M
| $250K | ﹤0.01% |
254
+50
| +25% | +$523 |
|
4308
CALL
National Fuel Gas
NFG
$7.75B
| $250K | ﹤0.01% |
61
-155
| -72% | -$6.45K |
|
4309
Palomar
PLMR
$3.79B
| $250K | ﹤0.01% |
2,821
+2,406
| +580% | +$202K |
|
|
OPLN
4310
Openlane
OPLN
$4.34B
| $249K | ﹤0.01% |
13,430
-7,466
| -36% | -$129K |
|
4311
Liquidity Services
LQDT
$1.21B
| $249K | ﹤0.01% |
15,710
+5,111
| +48% | +$57.5K |
|
|
MGIC
4312
DELISTED
Magic Software Enterprises
MGIC
| $249K | ﹤0.01% |
15,918
+5,190
| +48% | +$74.7K |
|
4313
CALL
Pennant Group
PNTG
$1.44B
| $249K | ﹤0.01% |
43
-4
| -9% | -$192 |
|
4314
Power Integrations
POWI
$3.2B
| $249K | ﹤0.01% |
3,051
+2,671
| +703% | +$181K |
|
|
CD
4315
DELISTED
Chindata Group Holdings Limited American Depositary Shares
CD
| $249K | ﹤0.01% |
+10,426
| New | +$171K |
|
4316
PUT
GFL Environmental
GFL
$14.5B
| $248K | ﹤0.01% |
85
-281
| -77% | -$6.88K |
|
4317
Corning
GLW
$107B
| $248K | ﹤0.01% |
6,900
-4,395
| -39% | -$156K |
|
|
LX
4318
CALL
LexinFintech Holdings
LX
$246M
| $248K | ﹤0.01% |
371
-85
| -19% | -$608 |
|
4319
CALL
Maximus
MMS
$3.32B
| $248K | ﹤0.01% |
34
+32
| +1,600% | +$2.27K |
|
4320
Mine Safety
MSA
$6.82B
| $248K | ﹤0.01% |
1,662
+1,380
| +489% | +$199K |
|
4321
Tower Semiconductor
TSEM
$21.5B
| $248K | ﹤0.01% |
9,623
-21,611
| -69% | -$494K |
|
|
MGLN
4322
CALL
DELISTED
Magellan Health Services, Inc.
MGLN
| $248K | ﹤0.01% |
30
+9
| +43% | +$712 |
|
|
QELL
4323
CALL
DELISTED
Qell Acquisition Corp. Class A Ordinary Shares
QELL
| $248K | ﹤0.01% |
+202
| New | +$2.38K |
|
4324
PUT
Axos Financial
AX
$5.6B
| $247K | ﹤0.01% |
66
-43
| -39% | -$1.36K |
|
4325
PUT
Lexicon Pharmaceuticals
LXRX
$1.03B
| $247K | ﹤0.01% |
724
+642
| +783% | +$1.23K |
|
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.