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 | |
|---|---|---|---|---|---|---|
4026
CALL
IMAX
IMAX
$2.67B
| $10K | ﹤0.01% |
235
+176
| +298% | +$3.66K |
|
4027
CALL
Ingles Markets
IMKTA
$1.72B
| $10K | ﹤0.01% |
34
+10
| +42% | +$334 |
|
|
IPG
4028
CALL
DELISTED
Interpublic Group of Companies
IPG
| $10K | ﹤0.01% |
58
-73
| -56% | -$1.64K |
|
4029
PUT
LPL Financial
LPLA
$27B
| $10K | ﹤0.01% |
193
+156
| +422% | +$9.67K |
|
4030
PUT
Microchip Technology
MCHP
$38.8B
| $10K | ﹤0.01% |
138
-368
| -73% | -$17K |
|
4031
CALL
Monarch Casino & Resort
MCRI
$2.2B
| $10K | ﹤0.01% |
83
-105
| -56% | -$4.61K |
|
|
CALY
4032
CALL
Callaway Golf Company
CALY
$3.28B
| $10K | ﹤0.01% |
+168
| New | +$2.56K |
|
4033
CALL
MSC Industrial Direct
MSM
$6.76B
| $10K | ﹤0.01% |
+18
| New | +$1.66K |
|
4034
CALL
Neurogene
NGNE
$672M
| $10K | ﹤0.01% |
+1
| New | +$276 |
|
4035
Ingevity
NGVT
$2.46B
| $10K | ﹤0.01% |
148
-2,475
| -94% | -$185K |
|
4036
NMI Holdings
NMIH
$3.37B
| $10K | ﹤0.01% |
626
-1,710
| -73% | -$31.8K |
|
4037
CALL
NETGEAR
NTGR
$612M
| $10K | ﹤0.01% |
21
+12
| +133% | +$738 |
|
4038
PUT
New York Times
NYT
$12.6B
| $10K | ﹤0.01% |
+96
| New | +$2.21K |
|
4039
OGE Energy
OGE
$9.87B
| $10K | ﹤0.01% |
+312
| New | +$9.85K |
|
4040
Option Care Health
OPCH
$3.58B
| $10K | ﹤0.01% |
1,033
+612
| +145% | +$7.08K |
|
4041
OneSpan
OSPN
$584M
| $10K | ﹤0.01% |
+782
| New | +$10.7K |
|
4042
Protalix BioTherapeutics
PLX
$183M
| $10K | ﹤0.01% |
1,910
+830
| +77% | +$5.46K |
|
4043
PUT
Pricesmart
PSMT
$5.94B
| $10K | ﹤0.01% |
+26
| New | +$2.14K |
|
4044
CALL
Reading International Class A
RDI
$32.5M
| $10K | ﹤0.01% |
201
+83
| +70% | +$1.38K |
|
4045
CALL
Rithm Capital
RITM
$5.58B
| $10K | ﹤0.01% |
240
+96
| +67% | +$1.63K |
|
4046
CALL
SAP
SAP
$215B
| $10K | ﹤0.01% |
64
-17
| -21% | -$1.84K |
|
4047
PUT
SBA Communications
SBAC
$19.8B
| $10K | ﹤0.01% |
99
+88
| +800% | +$14.6K |
|
4048
CALL
Snap-on
SNA
$21.5B
| $10K | ﹤0.01% |
75
+25
| +50% | +$4.11K |
|
|
SNBR
4049
DELISTED
Sleep Number
SNBR
| $10K | ﹤0.01% |
+298
| New | +$10.9K |
|
4050
Sonoco
SON
$5.83B
| $10K | ﹤0.01% |
+214
| New | +$10.9K |
|
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.