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 | |
|---|---|---|---|---|---|---|
|
FDC
1326
CALL
DELISTED
First Data Corporation
FDC
| $2.11M | 0.01% |
803
-486
| -38% | -$11.5K |
|
1327
PUT
Tyler Technologies
TYL
$12.2B
| $2.1M | 0.01% |
103
+101
| +5,050% | +$20K |
|
|
SFLY
1328
PUT
DELISTED
Shutterfly, Inc.
SFLY
| $2.1M | 0.01% |
518
+387
| +295% | +$17K |
|
1329
CALL
Acuity Brands
AYI
$9.88B
| $2.1M | 0.01% |
175
-50
| -22% | -$6.22K |
|
|
SFIX
1330
CALL
Stitch Fix
SFIX
$478M
| $2.1M | 0.01% |
744
+444
| +148% | +$11K |
|
1331
Carnival Corporation Ltd
CCL
$36.1B
| $2.1M | 0.01% |
41,396
+10,363
| +33% | +$574K |
|
1332
PUT
Mattel
MAT
$4.17B
| $2.1M | 0.01% |
1,615
+828
| +105% | +$11.1K |
|
1333
PUT
iRhythm Holdings
IRTC
$3.59B
| $2.1M | 0.01% |
+280
| New | +$23.9K |
|
|
MRO
1334
CALL
DELISTED
Marathon Oil Corporation
MRO
| $2.1M | 0.01% |
1,255
-408
| -25% | -$6.67K |
|
1335
CALL
JB Hunt Transport Services
JBHT
$27.1B
| $2.1M | 0.01% |
207
+115
| +125% | +$11.9K |
|
1336
PUT
Texas Roadhouse
TXRH
$12.7B
| $2.1M | 0.01% |
337
+281
| +502% | +$17.6K |
|
|
ICPT
1337
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $2.1M | 0.01% |
18,729
+14,498
| +343% | +$1.58M |
|
|
MRSH
1338
PUT
Marsh
MRSH
$86.3B
| $2.09M | 0.01% |
223
-9
| -4% | -$796 |
|
1339
CALL
Pinnacle West Capital
PNW
$12.9B
| $2.09M | 0.01% |
219
-12
| -5% | -$1.08K |
|
1340
Advanced Micro Devices
AMD
$851B
| $2.09M | 0.01% |
+81,997
| New | +$1.86M |
|
1341
PUT
Eagle Materials
EXP
$6.6B
| $2.09M | 0.01% |
248
+227
| +1,081% | +$16.4K |
|
1342
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.58B
| $2.08M | 0.01% |
+44,597
| New | +$1.86M |
|
1343
PUT
Copart
CPRT
$25.9B
| $2.08M | 0.01% |
1,376
+1,088
| +378% | +$14.8K |
|
1344
PUT
Snap-on
SNA
$20.9B
| $2.08M | 0.01% |
133
+95
| +250% | +$15.1K |
|
1345
CALL
Yelp
YELP
$1.38B
| $2.08M | 0.01% |
603
+231
| +62% | +$8.35K |
|
1346
KraneShares CSI China Internet ETF
KWEB
$5.2B
| $2.08M | 0.01% |
44,114
+27,489
| +165% | +$1.21M |
|
1347
CALL
AstraZeneca
AZN
$263B
| $2.07M | 0.01% |
257
-2
| -0.8% | -$158 |
|
1348
CALL
Abercrombie & Fitch
ANF
$4.17B
| $2.07M | 0.01% |
755
+242
| +47% | +$5.43K |
|
1349
PUT
Logitech
LOGI
$15.2B
| $2.07M | 0.01% |
526
+372
| +242% | +$13.4K |
|
1350
CALL
Alnylam Pharmaceuticals
ALNY
$36.3B
| $2.06M | 0.01% |
221
-72
| -25% | -$6.02K |
|
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.