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 | |
|---|---|---|---|---|---|---|
1851
Merit Medical Systems
MMSI
$4.43B
| $94K | ﹤0.01% |
+2,081
| New | +$94.2K |
|
1852
OraSure Technologies
OSUR
$273M
| $94K | ﹤0.01% |
5,599
+395
| +8% | +$7.49K |
|
1853
PUT
Impinj
PI
$3.89B
| $94K | ﹤0.01% |
110
-84
| -43% | -$1.4K |
|
1854
Team
TISI
$77.7M
| $94K | ﹤0.01% |
691
+638
| +1,204% | +$105K |
|
1855
Valero Energy
VLO
$89.8B
| $94K | ﹤0.01% |
1,015
-13,273
| -93% | -$1.24M |
|
|
TTPH
1856
DELISTED
Tetraphase Pharmaceuticals, Inc.
TTPH
| $94K | ﹤0.01% |
1,541
-189
| -11% | -$16.6K |
|
1857
Axogen
AXGN
$2.1B
| $93K | ﹤0.01% |
2,560
-17,233
| -87% | -$529K |
|
1858
CALL
Heron Therapeutics
HRTX
$86.3M
| $93K | ﹤0.01% |
175
-310
| -64% | -$7.03K |
|
1859
PUT
Omeros
OMER
$709M
| $93K | ﹤0.01% |
368
+90
| +32% | +$1.26K |
|
1860
PUT
Wheaton Precious Metals
WPM
$50.6B
| $93K | ﹤0.01% |
296
+229
| +342% | +$4.7K |
|
|
IMMU
1861
CALL
DELISTED
Immunomedics Inc
IMMU
| $93K | ﹤0.01% |
200
-1,805
| -90% | -$29.5K |
|
1862
PUT
Aptiv
APTV
$12B
| $92K | ﹤0.01% |
157
-448
| -74% | -$40.7K |
|
|
BZUN
1863
PUT
Baozun
BZUN
$144M
| $92K | ﹤0.01% |
501
-255
| -34% | -$10K |
|
1864
CALL
Elevance Health
ELV
$81.9B
| $92K | ﹤0.01% |
194
-5
| -3% | -$1.18K |
|
1865
Equinor
EQNR
$95.9B
| $92K | ﹤0.01% |
3,928
+1,996
| +103% | +$45.8K |
|
|
IPG
1866
DELISTED
Interpublic Group of Companies
IPG
| $92K | ﹤0.01% |
+4,021
| New | +$90.3K |
|
1867
CALL
NextEra Energy
NEE
$187B
| $92K | ﹤0.01% |
460
-404
| -47% | -$15.6K |
|
1868
CALL
Public Storage
PSA
$60.2B
| $92K | ﹤0.01% |
826
+77
| +10% | +$15K |
|
|
CRZO
1869
PUT
DELISTED
Carrizo Oil & Gas Inc
CRZO
| $92K | ﹤0.01% |
336
-13
| -4% | -$244 |
|
|
STI
1870
CALL
DELISTED
SunTrust Banks, Inc.
STI
| $92K | ﹤0.01% |
483
+34
| +8% | +$2.36K |
|
|
BRS
1871
PUT
DELISTED
Bristow Group, Inc.
BRS
| $92K | ﹤0.01% |
276
-54
| -16% | -$803 |
|
|
GTT
1872
CALL
DELISTED
GTT Communications, Inc.
GTT
| $92K | ﹤0.01% |
140
+130
| +1,300% | +$6.41K |
|
1873
CALL
Brookdale Senior Living
BKD
$3.62B
| $91K | ﹤0.01% |
+12,944
| New | +$109K |
|
1874
CALL
Diageo
DEO
$46.2B
| $91K | ﹤0.01% |
302
+31
| +11% | +$4.31K |
|
1875
CALL
GameStop
GME
$9.5B
| $91K | ﹤0.01% |
6,172
+2,204
| +56% | +$8.99K |
|
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.