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 | |
|---|---|---|---|---|---|---|
1126
CALL
Coca-Cola
KO
$354B
| $239K | 0.01% |
1,569
-1,522
| -49% | -$68.4K |
|
1127
PUT
Acuity Brands
AYI
$9.88B
| $238K | 0.01% |
192
+1
| +0.5% | +$154 |
|
1128
CALL
Cognizant
CTSH
$21.5B
| $238K | 0.01% |
1,057
+172
| +19% | +$13.6K |
|
|
FL
1129
CALL
DELISTED
Foot Locker
FL
| $237K | 0.01% |
536
-555
| -51% | -$25.8K |
|
1130
Nelnet
NNI
$4.79B
| $237K | 0.01% |
4,539
+679
| +18% | +$36K |
|
|
APTI
1131
CALL
DELISTED
Apptio, Inc. Class A Common Stock
APTI
| $237K | 0.01% |
573
-133
| -19% | -$3.56K |
|
1132
Ichor Holdings
ICHR
$3.02B
| $236K | 0.01% |
9,767
-1,621
| -14% | -$44.1K |
|
1133
PUT
Pan American Silver
PAAS
$18.6B
| $236K | 0.01% |
334
+166
| +99% | +$2.64K |
|
1134
Teradata
TDC
$2.68B
| $236K | 0.01% |
5,956
-2,827
| -32% | -$111K |
|
1135
PUT
PACCAR
PCAR
$69.6B
| $235K | 0.01% |
807
+495
| +159% | +$23.4K |
|
1136
CALL
S&P Global
SPGI
$126B
| $235K | 0.01% |
182
+114
| +168% | +$21K |
|
|
HNP
1137
DELISTED
Huaneng Power Intl, Inc.
HNP
| $235K | 0.01% |
8,762
+5,796
| +195% | +$148K |
|
1138
PUT
Eli Lilly
LLY
$1.07T
| $234K | 0.01% |
649
-343
| -35% | -$27.6K |
|
1139
CALL
Mondelez International
MDLZ
$77.7B
| $234K | 0.01% |
1,098
-969
| -47% | -$42.1K |
|
1140
PUT
Patterson-UTI
PTEN
$3.87B
| $234K | 0.01% |
+621
| New | +$13K |
|
1141
CALL
SBA Communications
SBAC
$18.4B
| $234K | 0.01% |
1,338
+1,223
| +1,063% | +$203K |
|
1142
CALL
Yum! Brands
YUM
$41B
| $234K | 0.01% |
566
-102
| -15% | -$8.36K |
|
1143
Jazz Pharmaceuticals
JAZZ
$15.9B
| $233K | 0.01% |
1,544
-1,449
| -48% | -$213K |
|
|
PTLA
1144
PUT
DELISTED
Portola Pharmaceuticals, Inc.
PTLA
| $233K | 0.01% |
339
+29
| +9% | +$1.27K |
|
1145
MGIC Investment
MTG
$6.27B
| $232K | 0.01% |
17,898
+14,354
| +405% | +$203K |
|
|
ADVM
1146
DELISTED
Adverum Biotechnologies
ADVM
| $231K | 0.01% |
3,993
+1,102
| +38% | +$68.6K |
|
1147
PUT
Ciena
CIEN
$55.3B
| $231K | 0.01% |
1,448
+945
| +188% | +$22.2K |
|
1148
US Bancorp
USB
$99.6B
| $231K | 0.01% |
+4,583
| New | +$251K |
|
|
EGN
1149
DELISTED
Energen
EGN
| $231K | 0.01% |
3,688
-14,581
| -80% | -$818K |
|
1150
ADT
ADT
$5.16B
| $230K | 0.01% |
+29,033
| New | +$318K |
|
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.