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 |
iShares Russell 2000 ETF
IWM
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 97.22% |
| 2 | Technology | 0.66% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Healthcare | 0.33% |
| 5 | Financials | 0.3% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
351
PUT
RH
RH
$2.8B
| $14.4M | 0.03% |
241
-362
| -60% | -$178K |
|
352
United Airlines
UAL
$36.2B
| $14.3M | 0.03% |
248,710
+248,610
| +248,610% | +$12.1M |
|
353
Teladoc Health
TDOC
$1.14B
| $14.3M | 0.03% |
78,708
+29,145
| +59% | +$6.76M |
|
354
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$244M
| $14.1M | 0.03% |
17,032
-33,300
| -66% | -$532K |
|
355
PUT
Prudential Financial
PRU
$42.1B
| $14.1M | 0.03% |
1,550
-49
| -3% | -$4.2K |
|
356
CALL
First Solar
FSLR
$22B
| $14.1M | 0.03% |
+1,616
| New | +$148K |
|
357
PUT
Macy's
M
$6.06B
| $14.1M | 0.03% |
8,714
+1,461
| +20% | +$22.3K |
|
358
CALL
SAP
SAP
$248B
| $14.1M | 0.03% |
1,146
+576
| +101% | +$73K |
|
359
Norwegian Cruise Line
NCLH
$7.15B
| $14M | 0.03% |
508,323
+214,676
| +73% | +$5.71M |
|
360
CALL
MetLife
MET
$62B
| $14M | 0.03% |
2,305
-274
| -11% | -$15.1K |
|
361
CALL
Marriott International
MAR
$87.8B
| $13.9M | 0.03% |
940
-1,855
| -66% | -$253K |
|
362
PUT
DuPont de Nemours
DD
$17.8B
| $13.8M | 0.02% |
1,428
-1,195
| -46% | -$115K |
|
363
CALL
Truist Financial
TFC
$63.1B
| $13.8M | 0.02% |
1,850
-379
| -17% | -$20.8K |
|
|
364
CALL
Macy's
M
$6.06B
| $13.7M | 0.02% |
8,466
+1,035
| +14% | +$15.8K |
|
|
HES
365
PUT
DELISTED
Hess
HES
| $13.6M | 0.02% |
1,927
-1,059
| -35% | -$67.7K |
|
366
CALL
SLB Ltd
SLB
$85.3B
| $13.6M | 0.02% |
4,998
-3,071
| -38% | -$80.8K |
|
367
CALL
Blackstone
BX
$102B
| $13.6M | 0.02% |
1,822
-321
| -15% | -$22.2K |
|
368
CALL
Automatic Data Processing
ADP
$110B
| $13.6M | 0.02% |
720
+263
| +58% | +$45.6K |
|
|
WORK
369
CALL
DELISTED
Slack Technologies, Inc.
WORK
| $13.5M | 0.02% |
3,333
-4,011
| -55% | -$168K |
|
370
PUT
Sherwin-Williams
SHW
$81B
| $13.5M | 0.02% |
549
-57
| -9% | -$13.6K |
|
371
CALL
DexCom
DXCM
$33.2B
| $13.4M | 0.02% |
1,496
+272
| +22% | +$25.5K |
|
372
PUT
Caesars Entertainment
CZR
$6.05B
| $13.4M | 0.02% |
1,534
-158
| -9% | -$13.3K |
|
373
PUT
NetEase
NTES
$76.4B
| $13.4M | 0.02% |
1,298
-1,614
| -55% | -$183K |
|
374
PUT
Upstart Holdings
UPST
$2.73B
| $13.4M | 0.02% |
+1,039
| New | +$79.7K |
|
375
CALL
Northrop Grumman
NOC
$73.2B
| $13.3M | 0.02% |
412
+61
| +17% | +$18.4K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q1 2021 filing shows 2,255 new, 3,360 increased, 3,150 reduced and 1,707 closed positions. Its largest new stake was Pfizer: 464,628 shares worth $16.8M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,255 new positions and closed 1,707 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.