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 | |
|---|---|---|---|---|---|---|
176
PUT
VanEck Gold Miners ETF
GDX
$22.7B
| $2.2M | 0.1% |
12,052
+1,047
| +10% | +$23.6K |
|
|
SC
177
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $2.19M | 0.1% |
134,578
+100,835
| +299% | +$1.74M |
|
178
Cigna
CI
$76.8B
| $2.18M | 0.1% |
12,973
+7,178
| +124% | +$1.39M |
|
|
HDS
179
CALL
DELISTED
HD Supply Holdings, Inc.
HDS
| $2.17M | 0.1% |
57,181
+57,028
| +37,273% | +$2.15M |
|
180
Occidental Petroleum
OXY
$56.2B
| $2.15M | 0.09% |
+33,036
| New | +$2.31M |
|
|
ORBK
181
DELISTED
Orbotech Ltd
ORBK
| $2.13M | 0.09% |
34,306
+33,786
| +6,497% | +$1.85M |
|
182
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $2.1M | 0.09% |
13,308
-6,143
| -32% | -$558K |
|
183
VanEck Semiconductor ETF
SMH
$70.3B
| $2.1M | 0.09% |
+40,330
| New | +$2.12M |
|
184
Comcast
CMCSA
$85.1B
| $2.09M | 0.09% |
61,117
-37,780
| -38% | -$1.47M |
|
|
UWC
185
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $2.08M | 0.09% |
1,441
-621
| -30% | -$899K |
|
|
RHT
186
DELISTED
Red Hat Inc
RHT
| $2.07M | 0.09% |
13,831
+5,629
| +69% | +$780K |
|
|
TWTR
187
PUT
DELISTED
Twitter, Inc.
TWTR
| $2.03M | 0.09% |
7,556
+4,393
| +139% | +$129K |
|
188
Cheniere Energy
LNG
$55B
| $2.01M | 0.09% |
37,634
+16,598
| +79% | +$914K |
|
189
PUT
Caterpillar
CAT
$410B
| $1.99M | 0.09% |
6,112
+1,551
| +34% | +$245K |
|
|
LNW
190
CALL
DELISTED
Light & Wonder
LNW
| $1.98M | 0.09% |
47,241
+47,047
| +24,251% | +$2.2M |
|
191
CALL
Weibo
WB
$1.97B
| $1.97M | 0.09% |
13,727
+12,891
| +1,542% | +$1.65M |
|
|
ATVI
192
DELISTED
Activision Blizzard
ATVI
| $1.97M | 0.09% |
29,168
+16,361
| +128% | +$1.15M |
|
193
PUT
JPMorgan Chase
JPM
$918B
| $1.96M | 0.09% |
4,205
-1,809
| -30% | -$205K |
|
|
LSI
194
DELISTED
Life Storage, Inc.
LSI
| $1.94M | 0.09% |
34,913
+20,361
| +140% | +$1.11M |
|
195
PUT
AbbVie
ABBV
$452B
| $1.93M | 0.09% |
3,525
-562
| -14% | -$61.7K |
|
196
NVIDIA
NVDA
$5.02T
| $1.93M | 0.08% |
333,640
-2,813,280
| -89% | -$16.5M |
|
197
CALL
Alkermes
ALKS
$8.81B
| $1.91M | 0.08% |
32,758
+32,724
| +96,247% | +$1.91M |
|
198
Automatic Data Processing
ADP
$102B
| $1.91M | 0.08% |
16,825
-2,826
| -14% | -$330K |
|
199
CALL
TG Therapeutics
TGTX
$8.26B
| $1.91M | 0.08% |
119,345
+118,200
| +10,323% | +$1.51M |
|
200
Vulcan Materials
VMC
$36.4B
| $1.9M | 0.08% |
16,618
-6,624
| -29% | -$834K |
|
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.