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 | Miscellaneous | 97.26% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.58% |
| 4 | Communication Services | 0.34% |
| 5 | Healthcare | 0.32% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
901
CALL
Zscaler
ZS
$27.7B
| $4.3M | 0.01% |
925
-493
| -35% | -$22.9K |
|
|
NVRO
902
PUT
DELISTED
NEVRO CORP.
NVRO
| $4.29M | 0.01% |
365
+164
| +82% | +$16.2K |
|
|
OPTU
903
PUT
Optimum Communications Inc
OPTU
$401M
| $4.29M | 0.01% |
1,568
+209
| +15% | +$5.77K |
|
904
PUT
MSCI
MSCI
$41.7B
| $4.29M | 0.01% |
166
-311
| -65% | -$75.8K |
|
|
CHL
905
PUT
DELISTED
China Mobile Limited
CHL
| $4.28M | 0.01% |
1,013
+7
| +0.7% | +$282 |
|
906
CALL
Tower Semiconductor
TSEM
$25.1B
| $4.25M | 0.01% |
1,765
+792
| +81% | +$17.8K |
|
907
Walt Disney
DIS
$182B
| $4.24M | 0.01% |
29,346
+14,670
| +100% | +$2.05M |
|
908
PUT
Zoom
ZM
$29.6B
| $4.24M | 0.01% |
623
-347
| -36% | -$23.9K |
|
909
PUT
Everest Group
EG
$14.6B
| $4.24M | 0.01% |
153
-392
| -72% | -$103K |
|
|
CERN
910
PUT
DELISTED
Cerner Corp
CERN
| $4.23M | 0.01% |
577
-675
| -54% | -$46.7K |
|
911
CALL
Atlassian
TEAM
$48B
| $4.22M | 0.01% |
351
-708
| -67% | -$86.2K |
|
|
BBL
912
PUT
DELISTED
BHP Group Plc American Depositary Shares (Each representing two Ordinary Shares)
BBL
| $4.21M | 0.01% |
896
+265
| +42% | +$11.7K |
|
913
Ubiquiti
UI
$35.1B
| $4.21M | 0.01% |
+22,268
| New | +$3.59M |
|
914
PUT
Viasat
VSAT
$10.4B
| $4.21M | 0.01% |
575
+426
| +286% | +$30.5K |
|
915
PUT
Ecolab
ECL
$78.3B
| $4.21M | 0.01% |
218
-204
| -48% | -$38.7K |
|
|
GWPH
916
PUT
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $4.19M | 0.01% |
401
+132
| +49% | +$14.8K |
|
917
PUT
Signet Jewelers
SIG
$3.31B
| $4.19M | 0.01% |
1,928
+955
| +98% | +$17K |
|
918
Restaurant Brands International
QSR
$28B
| $4.18M | 0.01% |
65,616
+44,563
| +212% | +$2.98M |
|
|
LKFT
919
PUT
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.87B
| $4.18M | 0.01% |
202
+59
| +41% | +$10.9K |
|
920
CALL
Trip.com Group
TCOM
$25.8B
| $4.17M | 0.01% |
1,245
-141
| -10% | -$4.54K |
|
921
CALL
Akamai
AKAM
$15.1B
| $4.16M | 0.01% |
482
+193
| +67% | +$16.9K |
|
922
PUT
Aptiv
APTV
$9.96B
| $4.15M | 0.01% |
437
+19
| +5% | +$1.74K |
|
923
CALL
Snap-on
SNA
$19.8B
| $4.15M | 0.01% |
245
+102
| +71% | +$16.6K |
|
924
CALL
YPF Sociedad Anonima ADS
YPF
$20.6B
| $4.14M | 0.01% |
3,573
+569
| +19% | +$5.52K |
|
925
PUT
Cracker Barrel
CBRL
$1.22B
| $4.13M | 0.01% |
269
+33
| +14% | +$5.19K |
|
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 Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.