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 | |
|---|---|---|---|---|---|---|
|
ONCE
826
DELISTED
Spark Therapeutics, Inc. Common Stock
ONCE
| $406K | 0.02% |
6,106
-10,490
| -63% | -$606K |
|
827
Deutsche Bank
DB
$66.3B
| $405K | 0.02% |
28,985
-84,419
| -74% | -$1.42M |
|
828
Lockheed Martin
LMT
$134B
| $405K | 0.02% |
1,200
-23,819
| -95% | -$8.11M |
|
|
SODA
829
CALL
DELISTED
SodaStream International Ltd
SODA
| $405K | 0.02% |
312
+102
| +49% | +$8.27K |
|
830
American Coastal Insurance
ACIC
$498M
| $404K | 0.02% |
21,129
+5,202
| +33% | +$99.8K |
|
831
BlackLine
BL
$1.69B
| $404K | 0.02% |
+10,312
| New | +$385K |
|
832
CALL
CSX Corp
CSX
$98.6B
| $404K | 0.02% |
4,089
-5,997
| -59% | -$112K |
|
|
TYNS
833
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $402K | 0.02% |
1,299
-15
| -1% | -$435 |
|
834
CALL
Halliburton
HAL
$27.9B
| $401K | 0.02% |
2,602
+543
| +26% | +$26.8K |
|
835
CALL
Service Corp International
SCI
$11.4B
| $401K | 0.02% |
+11,255
| New | +$432K |
|
|
TGH
836
DELISTED
Textainer Group Holdings limited
TGH
| $401K | 0.02% |
23,662
+13,850
| +141% | +$287K |
|
837
CALL
Newell Brands
NWL
$2.16B
| $398K | 0.02% |
12,500
+11,387
| +1,023% | +$322K |
|
838
VeriSign
VRSN
$25.5B
| $397K | 0.02% |
+3,356
| New | +$389K |
|
839
PUT
Autodesk
ADSK
$44.3B
| $396K | 0.02% |
1,107
+671
| +154% | +$79.9K |
|
840
Brixmor Property Group
BRX
$9.95B
| $396K | 0.02% |
25,981
+22,067
| +564% | +$352K |
|
|
LNW
841
PUT
DELISTED
Light & Wonder
LNW
| $396K | 0.02% |
248
+161
| +185% | +$7.54K |
|
842
Yum China
YUMC
$14.9B
| $396K | 0.02% |
+9,545
| New | +$410K |
|
|
RDUS
843
DELISTED
Radius Health, Inc.
RDUS
| $394K | 0.02% |
+10,975
| New | +$396K |
|
844
Philips
PHG
$25.4B
| $393K | 0.02% |
13,533
+3,538
| +35% | +$105K |
|
845
NETSCOUT
NTCT
$2.86B
| $392K | 0.02% |
14,887
+13,320
| +850% | +$362K |
|
846
CALL
ExxonMobil
XOM
$651B
| $391K | 0.02% |
5,001
+378
| +8% | +$30.2K |
|
847
PUT
General Dynamics
GD
$105B
| $390K | 0.02% |
607
+205
| +51% | +$44.6K |
|
848
Apollo Global Management
APO
$70.7B
| $389K | 0.02% |
+13,142
| New | +$442K |
|
849
Ross Stores
ROST
$76.6B
| $388K | 0.02% |
4,988
+2,953
| +145% | +$234K |
|
850
Applied Optoelectronics
AAOI
$8.04B
| $387K | 0.02% |
+15,454
| New | +$481K |
|
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.