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 | |
|---|---|---|---|---|---|---|
776
CALL
Marvell Technology
MRVL
$188B
| $5.23M | 0.01% |
1,968
-186
| -9% | -$4.71K |
|
777
CALL
HSBC
HSBC
$349B
| $5.22M | 0.01% |
1,336
+436
| +48% | +$16.5K |
|
778
PUT
Pinterest
PINS
$12.3B
| $5.21M | 0.01% |
2,798
+1,562
| +126% | +$33.7K |
|
779
PUT
National Healthcare
NHC
$3.46B
| $5.2M | 0.01% |
602
-21
| -3% | -$1.75K |
|
|
STMP
780
CALL
DELISTED
Stamps.com, Inc.
STMP
| $5.19M | 0.01% |
622
+73
| +13% | +$6.08K |
|
781
CALL
GDS Holdings
GDS
$6.52B
| $5.17M | 0.01% |
1,003
-374
| -27% | -$16.8K |
|
782
CALL
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $5.17M | 0.01% |
591
+163
| +38% | +$14.3K |
|
783
CALL
Regions Financial
RF
$26.2B
| $5.16M | 0.01% |
3,006
+1,626
| +118% | +$26.8K |
|
784
Ventas
VTR
$47.6B
| $5.16M | 0.01% |
89,336
+54,978
| +160% | +$3.45M |
|
|
GRUB
785
PUT
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $5.14M | 0.01% |
528
-124
| -19% | -$11.4K |
|
|
CYBR
786
CALL
DELISTED
CyberArk
CYBR
| $5.12M | 0.01% |
439
+191
| +77% | +$21.4K |
|
787
PUT
Enphase Energy
ENPH
$5.13B
| $5.11M | 0.01% |
1,957
+1,599
| +447% | +$36.4K |
|
788
PUT
Realty Income
O
$60.4B
| $5.11M | 0.01% |
716
+173
| +32% | +$12.9K |
|
789
CALL
Bath & Body Works
BBWI
$3.9B
| $5.08M | 0.01% |
3,467
+1,780
| +106% | +$25.7K |
|
790
CALL
Darden Restaurants
DRI
$22.2B
| $5.08M | 0.01% |
466
+362
| +348% | +$41.1K |
|
|
IRBT
791
CALL
DELISTED
iRobot
IRBT
| $5.08M | 0.01% |
1,003
+633
| +171% | +$31.8K |
|
|
EGRX
792
CALL
DELISTED
Eagle Pharmaceuticals, Inc.
EGRX
| $5.06M | 0.01% |
843
+487
| +137% | +$29K |
|
793
CALL
First Trust Natural Gas ETF
FCG
$636M
| $5.06M | 0.01% |
382
+279
| +271% | +$3.02K |
|
794
CALL
Shake Shack
SHAK
$2.26B
| $5.05M | 0.01% |
848
+485
| +134% | +$34.9K |
|
795
PUT
MarketAxess Holdings
MKTX
$4.06B
| $5.04M | 0.01% |
133
-123
| -48% | -$45.1K |
|
796
PUT
Public Storage
PSA
$55.3B
| $5.03M | 0.01% |
236
+6
| +3% | +$1.33K |
|
797
Western Digital
WDC
$192B
| $5.02M | 0.01% |
104,648
+88,890
| +564% | +$3.71M |
|
798
PUT
Ball Corp
BALL
$16.6B
| $5.02M | 0.01% |
776
+84
| +12% | +$5.69K |
|
799
Medtronic
MDT
$105B
| $5.01M | 0.01% |
+44,179
| New | +$4.85M |
|
800
CALL
Lear
LEA
$7.14B
| $5.01M | 0.01% |
365
+172
| +89% | +$21.3K |
|
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.