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 | |
|---|---|---|---|---|---|---|
3251
PUT
Eagle Materials
EXP
$6.86B
| $22K | ﹤0.01% |
331
+162
| +96% | +$17.5K |
|
3252
PUT
Factset
FDS
$10.1B
| $22K | ﹤0.01% |
151
+95
| +170% | +$19.2K |
|
3253
PUT
Highwoods Properties
HIW
$3.71B
| $22K | ﹤0.01% |
+102
| New | +$4.62K |
|
3254
CALL
Hexcel
HXL
$8.3B
| $22K | ﹤0.01% |
287
+190
| +196% | +$12.5K |
|
3255
iRhythm Holdings
IRTC
$3.86B
| $22K | ﹤0.01% |
+357
| New | +$22.1K |
|
|
K
3256
CALL
DELISTED
Kellanova
K
| $22K | ﹤0.01% |
606
+399
| +193% | +$25.2K |
|
|
LTC
3257
LTC Properties
LTC
$2.14B
| $22K | ﹤0.01% |
+585
| New | +$23K |
|
|
MRSH
3258
CALL
Marsh
MRSH
$91.7B
| $22K | ﹤0.01% |
350
+51
| +17% | +$4.22K |
|
3259
PUT
Natural Health Trends
NHTC
$15.6M
| $22K | ﹤0.01% |
445
+200
| +82% | +$3.39K |
|
3260
PUT
Nelnet
NNI
$4.92B
| $22K | ﹤0.01% |
148
+128
| +640% | +$6.79K |
|
3261
CALL
Nutrien
NTR
$33.3B
| $22K | ﹤0.01% |
+370
| New | +$18.5K |
|
3262
Novavax
NVAX
$1.21B
| $22K | ﹤0.01% |
538
-21
| -4% | -$844 |
|
|
ORC
3263
Orchid Island Capital
ORC
$1.31B
| $22K | ﹤0.01% |
+605
| New | +$23.3K |
|
3264
PUT
PBF Energy
PBF
$7.22B
| $22K | ﹤0.01% |
118
+30
| +34% | +$968 |
|
3265
CALL
PetMed Express
PETS
$43M
| $22K | ﹤0.01% |
46
-82
| -64% | -$3.79K |
|
3266
Regis Corp
RGS
$68.2M
| $22K | ﹤0.01% |
75
+57
| +317% | +$18K |
|
3267
Sally Beauty Holdings
SBH
$1.48B
| $22K | ﹤0.01% |
1,377
-2,916
| -68% | -$50K |
|
3268
CALL
abrdn Physical Silver Shares ETF
SIVR
$3.97B
| $22K | ﹤0.01% |
+143
| New | +$2.33K |
|
3269
PUT
Super Micro Computer
SMCI
$18.4B
| $22K | ﹤0.01% |
1,880
+1,210
| +181% | +$2.43K |
|
3270
PUT
State Street
STT
$50.2B
| $22K | ﹤0.01% |
405
+176
| +77% | +$18.4K |
|
3271
PUT
Viavi Solutions
VIAV
$8.66B
| $22K | ﹤0.01% |
+162
| New | +$1.54K |
|
3272
CALL
Vodafone
VOD
$37.7B
| $22K | ﹤0.01% |
1,203
-299
| -20% | -$8.91K |
|
|
ROIC
3273
DELISTED
Retail Opportunity Investments Corp.
ROIC
| $22K | ﹤0.01% |
1,296
+1,234
| +1,990% | +$22.2K |
|
|
LUMO
3274
PUT
DELISTED
Lumos Pharma, Inc. Common Stock
LUMO
| $22K | ﹤0.01% |
8
-4
| -33% | -$283 |
|
|
SPWR
3275
CALL
DELISTED
SunPower Corporation Common Stock
SPWR
| $22K | ﹤0.01% |
567
-224
| -28% | -$1.14K |
|
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.