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
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1051
Marriott Vacations Worldwide
VAC
$3.22B
| $2.25M | 0.01% |
19,923
+17,940
| +905% | +$2.22M |
|
1052
CALL
Synchrony
SYF
$23.3B
| $2.25M | 0.01% |
674
-23
| -3% | -$790 |
|
1053
PUT
Goodyear
GT
$2.02B
| $2.25M | 0.01% |
965
+89
| +10% | +$2.29K |
|
1054
Delek US
DK
$3.97B
| $2.24M | 0.01% |
44,697
+27,878
| +166% | +$1.39M |
|
|
CXO
1055
DELISTED
CONCHO RESOURCES INC.
CXO
| $2.24M | 0.01% |
16,177
+7,405
| +84% | +$1.06M |
|
1056
Agilent Technologies
A
$39.5B
| $2.24M | 0.01% |
+36,172
| New | +$2.36M |
|
1057
Sarepta Therapeutics
SRPT
$1.68B
| $2.24M | 0.01% |
16,920
-459
| -3% | -$43.3K |
|
1058
PUT
Eaton
ETN
$161B
| $2.23M | 0.01% |
299
+214
| +252% | +$16.6K |
|
1059
CALL
Eastman Chemical
EMN
$7.77B
| $2.23M | 0.01% |
223
+156
| +233% | +$16.5K |
|
1060
PUT
Omnicom Group
OMC
$22.2B
| $2.23M | 0.01% |
292
+284
| +3,550% | +$21K |
|
1061
PUT
Textron
TXT
$16.2B
| $2.23M | 0.01% |
338
+282
| +504% | +$18.2K |
|
|
GOOS
1062
CALL
Canada Goose Holdings
GOOS
$896M
| $2.22M | 0.01% |
378
+339
| +869% | +$14.3K |
|
|
GWPH
1063
CALL
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $2.22M | 0.01% |
159
-1,691
| -91% | -$240K |
|
1064
PUT
First Trust Natural Gas ETF
FCG
$636M
| $2.21M | 0.01% |
199
+118
| +146% | +$2.62K |
|
1065
PUT
TransDigm Group
TDG
$67.9B
| $2.21M | 0.01% |
64
+9
| +16% | +$2.96K |
|
1066
PUT
PagSeguro Digital
PAGS
$2.64B
| $2.2M | 0.01% |
+794
| New | +$26.2K |
|
1067
PUT
iShares MSCI Global Gold Miners ETF
RING
$2.31B
| $2.2M | 0.01% |
655
-2,051
| -76% | -$36.7K |
|
1068
Autoliv
ALV
$8.44B
| $2.2M | 0.01% |
21,313
+19,499
| +1,075% | +$2.08M |
|
1069
PUT
SBA Communications
SBAC
$18.5B
| $2.2M | 0.01% |
133
+34
| +34% | +$5.49K |
|
|
PDCE
1070
CALL
DELISTED
PDC Energy, Inc.
PDCE
| $2.19M | 0.01% |
363
+93
| +34% | +$5.36K |
|
1071
CALL
Papa John's
PZZA
$999M
| $2.19M | 0.01% |
432
-337
| -44% | -$18.9K |
|
|
GAP
1072
CALL
The Gap Inc
GAP
$6.8B
| $2.19M | 0.01% |
675
+220
| +48% | +$6.77K |
|
1073
PUT
HDFC Bank
HDB
$119B
| $2.18M | 0.01% |
832
-64
| -7% | -$1.6K |
|
1074
Marvell Technology
MRVL
$188B
| $2.18M | 0.01% |
101,886
+34,966
| +52% | +$746K |
|
|
BIG
1075
PUT
DELISTED
Big Lots, Inc.
BIG
| $2.18M | 0.01% |
522
+348
| +200% | +$14.6K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.