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 | |
|---|---|---|---|---|---|---|
|
ACB
1376
CALL
Aurora Cannabis
ACB
$165M
| $1.99M | 0.01% |
18
+7
| +64% | +$6.26K |
|
|
MNDT
1377
CALL
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.99M | 0.01% |
1,183
+658
| +125% | +$11.1K |
|
1378
CALL
Ameriprise Financial
AMP
$46.8B
| $1.99M | 0.01% |
155
+28
| +22% | +$3.48K |
|
1379
PUT
Pentair
PNR
$10.2B
| $1.99M | 0.01% |
446
-27
| -6% | -$1.12K |
|
|
CLDR
1380
DELISTED
Cloudera, Inc.
CLDR
| $1.98M | 0.01% |
181,405
+159,915
| +744% | +$2.06M |
|
1381
CALL
Euronet Worldwide
EEFT
$3.02B
| $1.98M | 0.01% |
139
+71
| +104% | +$8.85K |
|
1382
CALL
Aflac
AFL
$63.9B
| $1.98M | 0.01% |
396
-536
| -58% | -$25.8K |
|
1383
PUT
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $1.98M | 0.01% |
230
-361
| -61% | -$31.3K |
|
|
ZUO
1384
CALL
DELISTED
Zuora, Inc.
ZUO
| $1.98M | 0.01% |
989
+710
| +254% | +$15.3K |
|
1385
Allstate
ALL
$66.9B
| $1.98M | 0.01% |
+20,996
| New | +$1.9M |
|
1386
CALL
Live Nation Entertainment
LYV
$41.2B
| $1.98M | 0.01% |
311
+95
| +44% | +$5.39K |
|
1387
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $1.97M | 0.01% |
757
-198
| -21% | -$5.08K |
|
1388
CALL
MasTec
MTZ
$26.7B
| $1.97M | 0.01% |
409
+388
| +1,848% | +$17.4K |
|
1389
PUT
Waters Corp
WAT
$36.8B
| $1.96M | 0.01% |
78
+70
| +875% | +$15.9K |
|
1390
CALL
Bread Financial
BFH
$4.21B
| $1.96M | 0.01% |
140
-107
| -43% | -$14.6K |
|
1391
CALL
Citizens Financial Group
CFG
$30.4B
| $1.96M | 0.01% |
602
+597
| +11,940% | +$20.7K |
|
1392
Energy Transfer Partners
ET
$70.1B
| $1.96M | 0.01% |
127,273
+57,161
| +82% | +$849K |
|
1393
CALL
Gartner
IT
$9.41B
| $1.96M | 0.01% |
129
-136
| -51% | -$18.9K |
|
|
JOBS
1394
PUT
DELISTED
51job Inc
JOBS
| $1.95M | 0.01% |
251
+240
| +2,182% | +$16.7K |
|
1395
CALL
Vanguard FTSE Europe ETF
VGK
$30B
| $1.95M | 0.01% |
425
-1,888
| -82% | -$98.7K |
|
1396
CALL
Frontdoor
FTDR
$5.02B
| $1.95M | 0.01% |
+567
| New | +$17.3K |
|
1397
CALL
Rockwell Automation
ROK
$51.4B
| $1.95M | 0.01% |
111
-118
| -52% | -$20.1K |
|
1398
CALL
Comtech Telecommunications
CMTL
$51.8M
| $1.95M | 0.01% |
838
+574
| +217% | +$14.2K |
|
1399
PUT
Elastic
ESTC
$6.1B
| $1.94M | 0.01% |
243
+175
| +257% | +$14.6K |
|
|
SMAR
1400
DELISTED
Smartsheet Inc.
SMAR
| $1.94M | 0.01% |
47,583
+41,092
| +633% | +$1.42M |
|
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.