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 | |
|---|---|---|---|---|---|---|
201
Nektar Therapeutics
NKTR
$2.32B
| $1.89M | 0.08% |
+1,184
| New | +$1.53M |
|
202
FirstEnergy
FE
$28.1B
| $1.88M | 0.08% |
55,408
+44,999
| +432% | +$1.45M |
|
203
CALL
lululemon athletica
LULU
$13.2B
| $1.87M | 0.08% |
1,232
-565
| -31% | -$45.2K |
|
204
PUT
Regeneron Pharmaceuticals
REGN
$70.5B
| $1.87M | 0.08% |
854
-331
| -28% | -$115K |
|
205
PUT
Intuitive Surgical
ISRG
$124B
| $1.86M | 0.08% |
5,358
-2,928
| -35% | -$409K |
|
206
PUT
Walmart Inc
WMT
$878B
| $1.85M | 0.08% |
15,207
-2,577
| -14% | -$82.9K |
|
207
Sociedad Química y Minera de Chile
SQM
$19.3B
| $1.85M | 0.08% |
37,567
+22,960
| +157% | +$1.24M |
|
208
NextEra Energy
NEE
$183B
| $1.84M | 0.08% |
+45,196
| New | +$1.74M |
|
|
STMP
209
DELISTED
Stamps.com, Inc.
STMP
| $1.83M | 0.08% |
+9,098
| New | +$1.78M |
|
210
Papa John's
PZZA
$1.06B
| $1.82M | 0.08% |
31,746
+1,873
| +6% | +$112K |
|
211
PUT
Advanced Micro Devices
AMD
$888B
| $1.81M | 0.08% |
11,768
+8,952
| +318% | +$106K |
|
212
PUT
JD.com
JD
$41.1B
| $1.8M | 0.08% |
5,302
+516
| +11% | +$23.4K |
|
213
VanEck Junior Gold Miners ETF
GDXJ
$7.01B
| $1.8M | 0.08% |
+55,916
| New | +$1.84M |
|
214
CALL
Nutanix
NTNX
$14.6B
| $1.78M | 0.08% |
28,557
+28,430
| +22,386% | +$1.13M |
|
215
PUT
Bath & Body Works
BBWI
$4.09B
| $1.77M | 0.08% |
2,039
+65
| +3% | +$2.46K |
|
216
Teva Pharmaceuticals
TEVA
$36.5B
| $1.77M | 0.08% |
+103,831
| New | +$2.03M |
|
217
PUT
Wells Fargo
WFC
$266B
| $1.76M | 0.08% |
6,037
+2,543
| +73% | +$151K |
|
218
Molson Coors Class B
TAP
$7.66B
| $1.75M | 0.08% |
23,263
+13,187
| +131% | +$1.05M |
|
|
XYZ
219
PUT
Block Inc
XYZ
$47.8B
| $1.75M | 0.08% |
8,317
+2,005
| +32% | +$92K |
|
220
Lowe's Companies
LOW
$114B
| $1.74M | 0.08% |
19,815
-103,925
| -84% | -$9.84M |
|
221
PayPal
PYPL
$49.3B
| $1.72M | 0.08% |
22,667
-127,306
| -85% | -$10.1M |
|
222
CALL
Incyte
INCY
$23.5B
| $1.71M | 0.08% |
19,513
+18,898
| +3,073% | +$1.7M |
|
|
RDS.A
223
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $1.71M | 0.08% |
26,781
-27,940
| -51% | -$1.84M |
|
224
Campbell Soup
CPB
$6.66B
| $1.7M | 0.07% |
+39,163
| New | +$1.76M |
|
225
CALL
FedEx
FDX
$75.2B
| $1.69M | 0.07% |
1,684
+598
| +55% | +$151K |
|
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.