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 | |
|---|---|---|---|---|---|---|
1901
CALL
Edwards Lifesciences
EW
$47.6B
| $88K | ﹤0.01% |
189
-534
| -74% | -$23.2K |
|
1902
CALL
Intercontinental Exchange
ICE
$82.4B
| $88K | ﹤0.01% |
203
-152
| -43% | -$11.1K |
|
1903
CALL
LivePerson
LPSN
$18.9M
| $88K | ﹤0.01% |
27
+19
| +238% | +$3.8K |
|
1904
PUT
ArcelorMittal
MT
$50.4B
| $88K | ﹤0.01% |
271
-693
| -72% | -$23.8K |
|
|
PR
1905
Permian Resources
PR
$17.9B
| $88K | ﹤0.01% |
4,813
+679
| +16% | +$13.1K |
|
1906
PUT
Twilio
TWLO
$29.1B
| $88K | ﹤0.01% |
961
+278
| +41% | +$8.8K |
|
1907
Ventas
VTR
$48.9B
| $88K | ﹤0.01% |
1,784
-814
| -31% | -$42.7K |
|
|
VRN
1908
DELISTED
Veren
VRN
| $88K | ﹤0.01% |
12,951
+3,081
| +31% | +$23.4K |
|
1909
First Financial Bankshares
FFIN
$4.97B
| $87K | ﹤0.01% |
3,766
+1,460
| +63% | +$34.3K |
|
1910
PUT
Interactive Brokers
IBKR
$40.9B
| $87K | ﹤0.01% |
2,176
+1,912
| +724% | +$31.6K |
|
1911
CALL
T-Mobile US
TMUS
$193B
| $87K | ﹤0.01% |
680
-258
| -28% | -$16.1K |
|
1912
Viper Energy
VNOM
$8.81B
| $87K | ﹤0.01% |
3,442
-8,090
| -70% | -$191K |
|
1913
PUT
Viatris
VTRS
$20.1B
| $87K | ﹤0.01% |
1,050
-938
| -47% | -$40K |
|
|
NUVA
1914
PUT
DELISTED
NuVasive, Inc.
NUVA
| $87K | ﹤0.01% |
124
-4
| -3% | -$203 |
|
|
KDNY
1915
DELISTED
Chinook Therapeutics, Inc. Common Stock
KDNY
| $87K | ﹤0.01% |
1,877
+1,041
| +125% | +$38.1K |
|
|
INFO
1916
CALL
DELISTED
IHS Markit Ltd. Common Shares
INFO
| $87K | ﹤0.01% |
224
+136
| +155% | +$6.43K |
|
|
GLOG
1917
DELISTED
GASLOG LTD
GLOG
| $87K | ﹤0.01% |
+5,295
| New | +$100K |
|
|
AVP
1918
PUT
DELISTED
Avon Products, Inc.
AVP
| $87K | ﹤0.01% |
1,121
-983
| -47% | -$2.48K |
|
|
ESRX
1919
CALL
DELISTED
Express Scripts Holding Company
ESRX
| $87K | ﹤0.01% |
455
-493
| -52% | -$37.6K |
|
1920
Aurinia Pharmaceuticals
AUPH
$1.97B
| $86K | ﹤0.01% |
16,606
+13,533
| +440% | +$72.4K |
|
1921
PUT
Cimpress
CMPR
$2.37B
| $86K | ﹤0.01% |
56
-30
| -35% | -$4.47K |
|
1922
iShares US Transportation ETF
IYT
$2.33B
| $86K | ﹤0.01% |
1,852
-18,864
| -91% | -$910K |
|
1923
Magnachip Semiconductor
MX
$128M
| $86K | ﹤0.01% |
+9,062
| New | +$95.8K |
|
1924
PUT
Regency Centers
REG
$15B
| $86K | ﹤0.01% |
256
+160
| +167% | +$9.67K |
|
1925
Shake Shack
SHAK
$2.3B
| $86K | ﹤0.01% |
+2,085
| New | +$86.6K |
|
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.