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 | |
|---|---|---|---|---|---|---|
651
PUT
United Airlines
UAL
$38.7B
| $574K | 0.03% |
2,117
-1,928
| -48% | -$133K |
|
|
SGEN
652
DELISTED
Seagen Inc. Common Stock
SGEN
| $573K | 0.03% |
+10,962
| New | +$597K |
|
|
CLR
653
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $572K | 0.03% |
+9,710
| New | +$524K |
|
654
PUT
McKesson
MCK
$97.9B
| $571K | 0.03% |
333
-766
| -70% | -$119K |
|
|
SGI
655
Somnigroup International
SGI
$15B
| $570K | 0.03% |
50,360
-6,992
| -12% | -$96K |
|
656
CALL
Ollie's Bargain Outlet
OLLI
$4B
| $569K | 0.03% |
437
+376
| +616% | +$21.4K |
|
|
AABA
657
PUT
DELISTED
Altaba Inc
AABA
| $568K | 0.03% |
2,067
-1,681
| -45% | -$127K |
|
|
BLUE
658
PUT
DELISTED
bluebird bio
BLUE
| $567K | 0.02% |
31
+18
| +138% | +$45.8K |
|
659
CALL
ConocoPhillips
COP
$146B
| $567K | 0.02% |
1,730
-861
| -33% | -$48.7K |
|
660
CALL
Morgan Stanley
MS
$338B
| $567K | 0.02% |
1,667
-1,157
| -41% | -$64K |
|
|
UWC
661
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $567K | 0.02% |
928
-410
| -31% | -$251K |
|
662
CALL
JD.com
JD
$41B
| $566K | 0.02% |
5,826
+749
| +15% | +$34K |
|
|
SFLY
663
CALL
DELISTED
Shutterfly, Inc.
SFLY
| $565K | 0.02% |
451
+337
| +296% | +$23.5K |
|
664
Markel Group
MKL
$24.9B
| $562K | 0.02% |
481
+333
| +225% | +$375K |
|
|
ETFC
665
CALL
DELISTED
E*Trade Financial Corporation
ETFC
| $562K | 0.02% |
920
-348
| -27% | -$18.6K |
|
666
Royal Gold
RGLD
$17.1B
| $561K | 0.02% |
6,538
-10,251
| -61% | -$864K |
|
667
PUT
Altria Group
MO
$121B
| $560K | 0.02% |
1,750
-2,283
| -57% | -$151K |
|
668
Check Point Software Technologies
CHKP
$13.3B
| $558K | 0.02% |
5,619
-1,536
| -21% | -$158K |
|
669
PUT
Devon Energy
DVN
$51.9B
| $558K | 0.02% |
2,343
+1,006
| +75% | +$36.9K |
|
670
CALL
Illumina
ILMN
$29.5B
| $557K | 0.02% |
182
-169
| -48% | -$38.7K |
|
|
JP
671
DELISTED
Jupai Holdings Limited American depositary shares, each representing six ordinary shares
JP
| $555K | 0.02% |
+27,262
| New | +$552K |
|
672
Quanta Services
PWR
$95.4B
| $551K | 0.02% |
16,060
+8,076
| +101% | +$293K |
|
673
Vornado Realty Trust
VNO
$7.53B
| $548K | 0.02% |
8,153
+4,990
| +158% | +$346K |
|
|
PX
674
CALL
DELISTED
Praxair Inc
PX
| $548K | 0.02% |
3,969
+3,365
| +557% | +$523K |
|
675
Sturm, Ruger & Co
RGR
$612M
| $546K | 0.02% |
10,415
+8,743
| +523% | +$444K |
|
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.