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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
4226
PUT
Compass Diversified
CODI
$752M
| $111K | ﹤0.01% |
71
+59
| +492% | +$905 |
|
4227
CVR Energy
CVI
$3.48B
| $111K | ﹤0.01% |
+2,698
| New | +$107K |
|
4228
PUT
Covenant Logistics
CVLG
$1.04B
| $111K | ﹤0.01% |
118
+82
| +228% | +$908 |
|
4229
PUT
8x8 Inc
EGHT
$279M
| $111K | ﹤0.01% |
55
+44
| +400% | +$860 |
|
4230
PUT
JB Hunt Transport Services
JBHT
$25.9B
| $111K | ﹤0.01% |
11
-19
| -63% | -$1.97K |
|
4231
Lennar Class A
LEN
$20.4B
| $111K | ﹤0.01% |
2,346
-20,336
| -90% | -$920K |
|
4232
PUT
QuidelOrtho
QDEL
$1.13B
| $111K | ﹤0.01% |
17
-8
| -32% | -$484 |
|
4233
Dr. Reddy's Laboratories
RDY
$9.8B
| $111K | ﹤0.01% |
13,770
+2,805
| +26% | +$21.3K |
|
4234
Sabre
SABR
$716M
| $111K | ﹤0.01% |
+5,209
| New | +$116K |
|
4235
Zai Lab
ZLAB
$2.07B
| $111K | ﹤0.01% |
3,771
+2,764
| +274% | +$75.7K |
|
4236
Zumiez
ZUMZ
$330M
| $111K | ﹤0.01% |
4,484
-268
| -6% | -$6.35K |
|
|
NRE
4237
PUT
DELISTED
NorthStar Realty Europe Corp.
NRE
| $111K | ﹤0.01% |
+64
| New | +$1.09K |
|
|
GTT
4238
DELISTED
GTT Communications, Inc.
GTT
| $111K | ﹤0.01% |
+3,207
| New | +$94.2K |
|
|
FIEU
4239
CALL
DELISTED
FI Enhanced Europe 50 ETN
FIEU
| $111K | ﹤0.01% |
90
-22
| -20% | -$27.1K |
|
|
CMCM
4240
Cheetah Mobile
CMCM
$87.2M
| $110K | ﹤0.01% |
3,454
+2,876
| +498% | +$97.9K |
|
4241
Extra Space Storage
EXR
$32.3B
| $110K | ﹤0.01% |
+1,081
| New | +$104K |
|
4242
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$73M
| $110K | ﹤0.01% |
15
-90
| -86% | -$6.68K |
|
4243
Genworth Financial
GNW
$3.86B
| $110K | ﹤0.01% |
28,862
+28,125
| +3,816% | +$123K |
|
|
GOOD
4244
PUT
Gladstone Commercial Corp
GOOD
$623M
| $110K | ﹤0.01% |
53
+42
| +382% | +$847 |
|
4245
Insteel Industries
IIIN
$592M
| $110K | ﹤0.01% |
+5,266
| New | +$116K |
|
4246
PUT
KNOT Offshore Partners
KNOP
$354M
| $110K | ﹤0.01% |
58
-137
| -70% | -$2.56K |
|
4247
Newmark Group
NMRK
$2.64B
| $110K | ﹤0.01% |
13,203
-8,413
| -39% | -$79.8K |
|
4248
Turning Point Brands
TPB
$1.48B
| $110K | ﹤0.01% |
+2,387
| New | +$91.4K |
|
4249
CALL
WEC Energy
WEC
$36.3B
| $110K | ﹤0.01% |
14
-2
| -13% | -$148 |
|
4250
State Street SPDR S&P Semiconductor ETF
XSD
$2.51B
| $110K | ﹤0.01% |
1,411
+989
| +234% | +$73.4K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.