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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1251
PUT
Coca-Cola
KO
$354B
| $195K | 0.01% |
1,372
-2,006
| -59% | -$90.1K |
|
1252
PUT
Northrop Grumman
NOC
$77B
| $195K | 0.01% |
623
+118
| +23% | +$39.5K |
|
1253
Vanguard Mid-Cap Value ETF
VOE
$23.7B
| $195K | 0.01% |
1,791
+537
| +43% | +$60.4K |
|
1254
CALL
WIX.com
WIX
$2.15B
| $195K | 0.01% |
164
+113
| +222% | +$7.93K |
|
1255
CNX Resources
CNX
$4.85B
| $194K | 0.01% |
12,595
-14,283
| -53% | -$213K |
|
1256
PUT
Capital One
COF
$124B
| $194K | 0.01% |
1,331
-218
| -14% | -$21.7K |
|
1257
Digimarc Corp
DMRC
$133M
| $194K | 0.01% |
8,133
+5,467
| +205% | +$167K |
|
1258
CALL
Itaú Unibanco
ITUB
$91.3B
| $194K | 0.01% |
25,280
+23,979
| +1,843% | +$179K |
|
1259
CALL
MetLife
MET
$61B
| $194K | 0.01% |
2,455
-39
| -2% | -$1.89K |
|
1260
CALL
Under Armour Class C
UA
$2.92B
| $194K | 0.01% |
1,422
-262
| -16% | -$3.69K |
|
1261
PUT
EOG Resources
EOG
$78B
| $193K | 0.01% |
1,409
+579
| +70% | +$62.4K |
|
|
WGL
1262
DELISTED
Wgl Holdings
WGL
| $193K | 0.01% |
2,309
+2,255
| +4,176% | +$189K |
|
1263
Carlyle Group
CG
$16.3B
| $192K | 0.01% |
9,034
-10,836
| -55% | -$255K |
|
1264
CALL
PVH
PVH
$3.71B
| $192K | 0.01% |
114
-115
| -50% | -$16.8K |
|
1265
PUT
Vanguard S&P 500 ETF
VOO
$968B
| $192K | 0.01% |
1,494
+332
| +29% | +$83.3K |
|
|
ACIA
1266
DELISTED
Acacia Communications Inc
ACIA
| $192K | 0.01% |
5,003
-14,209
| -74% | -$560K |
|
|
AVXS
1267
CALL
DELISTED
AveXis, Inc. Common Stock
AVXS
| $192K | 0.01% |
324
+151
| +87% | +$17.9K |
|
|
CALD
1268
DELISTED
Callidus Software, Inc.
CALD
| $192K | 0.01% |
5,366
+3,302
| +160% | +$113K |
|
|
XL
1269
CALL
DELISTED
XL Group Ltd.
XL
| $192K | 0.01% |
434
-412
| -49% | -$18.1K |
|
1270
iShares MSCI France ETF
EWQ
$324M
| $191K | 0.01% |
6,089
+997
| +20% | +$31.9K |
|
1271
CALL
iShares Morningstar Value ETF
ILCV
$1.3B
| $191K | 0.01% |
9,978
+3,140
| +46% | +$166K |
|
1272
Stratasys
SSYS
$697M
| $191K | 0.01% |
+9,502
| New | +$203K |
|
1273
PUT
Trade Desk
TTD
$8.13B
| $191K | 0.01% |
2,500
+840
| +51% | +$4.3K |
|
|
MRNS
1274
DELISTED
Marinus Pharmaceuticals, Inc
MRNS
| $191K | 0.01% |
12,565
+12,061
| +2,393% | +$287K |
|
1275
Autoliv
ALV
$8.6B
| $190K | 0.01% |
+1,814
| New | +$187K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.