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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
351
CALL
Blackrock
BLK
$164B
| $14.7M | 0.03% |
293
-307
| -51% | -$146K |
|
352
PUT
HSBC
HSBC
$354B
| $14.6M | 0.03% |
3,745
+283
| +8% | +$10.7K |
|
353
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $14.6M | 0.03% |
668
+98
| +17% | +$19.8K |
|
|
RTN
354
PUT
DELISTED
Raytheon Company
RTN
| $14.6M | 0.03% |
664
-442
| -40% | -$93.4K |
|
355
PUT
Herbalife
HLF
$1.26B
| $14.4M | 0.03% |
3,022
+1,466
| +94% | +$63.5K |
|
356
PUT
Pinduoduo
PDD
$119B
| $14.4M | 0.03% |
3,799
+1,940
| +104% | +$72.4K |
|
357
PUT
S&P Global
SPGI
$127B
| $14.3M | 0.03% |
524
+138
| +36% | +$35.9K |
|
358
PUT
PG&E
PCG
$39.9B
| $14.2M | 0.03% |
13,034
+5,529
| +74% | +$47.4K |
|
359
PUT
Atlassian
TEAM
$21.7B
| $14.2M | 0.03% |
1,177
+442
| +60% | +$53.8K |
|
360
CALL
Proshares UltraShort Technology
REW
$3.3M
| $14.1M | 0.03% |
95
-20
| -17% | -$18.6K |
|
361
PUT
SLB Ltd
SLB
$71.3B
| $14.1M | 0.03% |
3,509
+18
| +0.5% | +$643 |
|
362
PUT
Spotify
SPOT
$97.5B
| $14.1M | 0.03% |
943
-41
| -4% | -$5.63K |
|
363
PUT
T-Mobile US
TMUS
$207B
| $14.1M | 0.03% |
1,798
+997
| +124% | +$78.4K |
|
364
CALL
Kroger
KR
$35.3B
| $13.9M | 0.03% |
4,795
-343
| -7% | -$9.09K |
|
|
UCD
365
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $13.9M | 0.03% |
6,171
+189
| +3% | +$425K |
|
366
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $13.8M | 0.03% |
2,333
-983
| -30% | -$21.2K |
|
367
CALL
Workday
WDAY
$32.7B
| $13.8M | 0.03% |
838
+34
| +4% | +$5.64K |
|
368
Broadcom
AVGO
$1.89T
| $13.7M | 0.03% |
435,070
+215,380
| +98% | +$6.54M |
|
|
369
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $13.7M | 0.03% |
2,315
+588
| +34% | +$12.7K |
|
370
CALL
Royal Caribbean
RCL
$76.7B
| $13.6M | 0.03% |
1,019
+433
| +74% | +$50.5K |
|
371
Advanced Micro Devices
AMD
$901B
| $13.6M | 0.03% |
+296,533
| New | +$10.9M |
|
372
PUT
Sea Limited
SE
$64.2B
| $13.6M | 0.03% |
3,377
+625
| +23% | +$21K |
|
373
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$332M
| $13.5M | 0.03% |
1,268
-253
| -17% | -$26.6K |
|
374
CALL
Illinois Tool Works
ITW
$78.8B
| $13.5M | 0.03% |
749
-20
| -3% | -$3.39K |
|
375
CALL
American Express
AXP
$238B
| $13.4M | 0.03% |
1,078
+44
| +4% | +$5.26K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.