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 | |
|---|---|---|---|---|---|---|
826
PUT
Aon
AON
$76B
| $4.81M | 0.01% |
231
+202
| +697% | +$40K |
|
|
SKX
827
CALL
DELISTED
Skechers
SKX
| $4.8M | 0.01% |
1,111
-246
| -18% | -$9.7K |
|
828
CALL
Weibo
WB
$1.92B
| $4.8M | 0.01% |
1,035
-440
| -30% | -$20.6K |
|
829
CALL
Royal Gold
RGLD
$16.9B
| $4.79M | 0.01% |
392
-56
| -13% | -$6.63K |
|
830
CALL
Monster Beverage
MNST
$91.5B
| $4.79M | 0.01% |
1,508
+1,136
| +305% | +$33.4K |
|
831
CALL
Becton Dickinson
BDX
$42.1B
| $4.79M | 0.01% |
180
+25
| +16% | +$6.23K |
|
832
PUT
Canadian Solar
CSIQ
$997M
| $4.78M | 0.01% |
2,163
+449
| +26% | +$8.13K |
|
|
AMED
833
PUT
DELISTED
Amedisys
AMED
| $4.77M | 0.01% |
286
+78
| +38% | +$11.6K |
|
834
Analog Devices
ADI
$185B
| $4.77M | 0.01% |
40,160
+13,313
| +50% | +$1.5M |
|
|
TYNS
835
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $4.75M | 0.01% |
733
-1,175
| -62% | -$30.4K |
|
836
PUT
Acadia Pharmaceuticals
ACAD
$4.25B
| $4.74M | 0.01% |
1,109
-39
| -3% | -$1.7K |
|
837
PUT
Tilray
TLRY
$493M
| $4.74M | 0.01% |
277
+63
| +29% | +$13K |
|
838
PUT
First Solar
FSLR
$22.1B
| $4.73M | 0.01% |
846
-52
| -6% | -$2.86K |
|
839
CALL
Arrowhead Research
ARWR
$12.2B
| $4.72M | 0.01% |
745
+373
| +100% | +$18.5K |
|
|
CCXI
840
PUT
DELISTED
ChemoCentryx, Inc.
CCXI
| $4.72M | 0.01% |
1,193
+859
| +257% | +$15.1K |
|
841
CALL
Qorvo
QRVO
$7.65B
| $4.71M | 0.01% |
405
-21
| -5% | -$2.03K |
|
842
PUT
Halliburton
HAL
$27.3B
| $4.71M | 0.01% |
1,923
-663
| -26% | -$14K |
|
843
CALL
KeyCorp
KEY
$24.4B
| $4.7M | 0.01% |
2,323
+1,380
| +146% | +$26K |
|
844
PUT
Gen Digital
GEN
$15.1B
| $4.7M | 0.01% |
1,842
+1,153
| +167% | +$28.2K |
|
845
PUT
Repligen
RGEN
$7.76B
| $4.68M | 0.01% |
506
+106
| +27% | +$8.9K |
|
|
ETFC
846
CALL
DELISTED
E*Trade Financial Corporation
ETFC
| $4.68M | 0.01% |
1,031
-325
| -24% | -$13.9K |
|
847
CALL
Best Buy
BBY
$17.8B
| $4.66M | 0.01% |
531
-588
| -53% | -$45K |
|
848
CALL
Toronto Dominion Bank
TD
$197B
| $4.65M | 0.01% |
828
+29
| +4% | +$1.65K |
|
849
PUT
Textron
TXT
$16.2B
| $4.64M | 0.01% |
1,041
+822
| +375% | +$38.1K |
|
|
ITCI
850
CALL
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $4.64M | 0.01% |
1,353
+803
| +146% | +$9.64K |
|
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.