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 | |
|---|---|---|---|---|---|---|
|
101
Boeing
BA
$161B
| $3.99M | 0.18% |
12,160
-64,019
| -84% | -$21.6M |
|
102
CALL
Domino's
DPZ
$10.9B
| $3.96M | 0.17% |
15,859
+15,653
| +7,599% | +$3.41M |
|
103
AbbVie
ABBV
$448B
| $3.95M | 0.17% |
41,700
-200
| -0.5% | -$22K |
|
104
Blackstone
BX
$151B
| $3.93M | 0.17% |
122,946
+67,620
| +122% | +$2.31M |
|
105
Walmart Inc
WMT
$878B
| $3.92M | 0.17% |
+132,126
| New | +$4.25M |
|
|
106
PUT
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $3.91M | 0.17% |
6,495
-649
| -9% | -$163K |
|
107
CALL
Intel
INTC
$530B
| $3.89M | 0.17% |
8,650
+1,323
| +18% | +$62.9K |
|
108
Philip Morris
PM
$293B
| $3.85M | 0.17% |
38,692
+23,275
| +151% | +$2.42M |
|
109
iShares Biotechnology ETF
IBB
$9.37B
| $3.82M | 0.17% |
+35,801
| New | +$3.97M |
|
110
CALL
Salesforce
CRM
$139B
| $3.8M | 0.17% |
3,446
-434
| -11% | -$49.8K |
|
111
American Express
AXP
$240B
| $3.73M | 0.16% |
39,943
+13,540
| +51% | +$1.31M |
|
112
CALL
Align Technology
ALGN
$12.5B
| $3.67M | 0.16% |
11,370
+10,681
| +1,550% | +$2.74M |
|
113
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $3.58M | 0.16% |
44,090
+9,478
| +27% | +$287K |
|
114
General Dynamics
GD
$100B
| $3.55M | 0.16% |
+16,069
| New | +$3.5M |
|
115
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $3.52M | 0.15% |
+29,734
| New | +$3.52M |
|
116
New Oriental
EDU
$7.84B
| $3.5M | 0.15% |
39,984
+24,227
| +154% | +$2.25M |
|
117
DuPont de Nemours
DD
$18.3B
| $3.47M | 0.15% |
21,507
-4,346
| -17% | -$786K |
|
|
PARA
118
DELISTED
Paramount Global Class B
PARA
| $3.41M | 0.15% |
66,439
+20,972
| +46% | +$1.15M |
|
119
Albemarle
ALB
$13.9B
| $3.39M | 0.15% |
36,518
+35,739
| +4,588% | +$3.94M |
|
120
PUT
Walt Disney
DIS
$167B
| $3.3M | 0.15% |
3,322
-4,639
| -58% | -$493K |
|
121
CALL
PayPal
PYPL
$49.3B
| $3.27M | 0.14% |
4,412
+454
| +11% | +$36K |
|
122
CALL
Mercado Libre
MELI
$92.4B
| $3.2M | 0.14% |
7,408
+7,282
| +5,779% | +$2.66M |
|
123
PUT
Qualcomm
QCOM
$183B
| $3.18M | 0.14% |
8,048
+976
| +14% | +$62.2K |
|
124
CALL
Bank of America
BAC
$430B
| $3.17M | 0.14% |
10,991
+444
| +4% | +$13.9K |
|
|
AET
125
DELISTED
Aetna Inc
AET
| $3.14M | 0.14% |
+18,598
| New | +$3.34M |
|
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.