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 | |
|---|---|---|---|---|---|---|
1301
CALL
Sea Limited
SE
$61.2B
| $2.17M | 0.01% |
924
+523
| +130% | +$9.16K |
|
1302
PUT
Alliant Energy
LNT
$19.4B
| $2.17M | 0.01% |
461
+357
| +343% | +$16K |
|
|
CS
1303
CALL
DELISTED
Credit Suisse Group
CS
| $2.17M | 0.01% |
1,859
-147
| -7% | -$1.75K |
|
|
AYX
1304
CALL
DELISTED
Alteryx Inc
AYX
| $2.16M | 0.01% |
258
+23
| +10% | +$1.66K |
|
1305
PUT
Omnicom Group
OMC
$22.7B
| $2.16M | 0.01% |
296
+158
| +114% | +$11.9K |
|
1306
PUT
VanEck Durable High Dividend ETF
DURA
$38.7M
| $2.16M | 0.01% |
647
+263
| +68% | +$6.82K |
|
1307
PUT
RingCentral
RNG
$4.05B
| $2.16M | 0.01% |
200
+73
| +57% | +$7.17K |
|
1308
PUT
LiveRamp
RAMP
$2.29B
| $2.15M | 0.01% |
395
+318
| +413% | +$15.8K |
|
1309
PUT
HUB Group
HUBG
$3.01B
| $2.15M | 0.01% |
1,054
+796
| +309% | +$17K |
|
|
TYNS
1310
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $2.15M | 0.01% |
613
-822
| -57% | -$23.1K |
|
1311
CALL
Dick's Sporting Goods
DKS
$18.4B
| $2.15M | 0.01% |
584
+393
| +206% | +$14K |
|
1312
PUT
Revvity
RVTY
$12.3B
| $2.15M | 0.01% |
223
+189
| +556% | +$17K |
|
1313
CALL
Waters Corp
WAT
$36.8B
| $2.14M | 0.01% |
85
+71
| +507% | +$16.2K |
|
1314
PUT
Paycom
PAYC
$6.78B
| $2.14M | 0.01% |
113
-138
| -55% | -$22.4K |
|
|
HUYA
1315
CALL
Huya Inc
HUYA
$542M
| $2.13M | 0.01% |
758
-1,084
| -59% | -$24.2K |
|
1316
PUT
Toll Brothers
TOL
$14B
| $2.13M | 0.01% |
589
+260
| +79% | +$9.35K |
|
1317
CALL
Bunge Global
BG
$23.6B
| $2.13M | 0.01% |
401
+91
| +29% | +$4.83K |
|
1318
PUT
Quanta Services
PWR
$93.9B
| $2.13M | 0.01% |
564
+563
| +56,300% | +$19.7K |
|
|
UNIT
1319
CALL
Uniti Group
UNIT
$2.63B
| $2.13M | 0.01% |
1,900
+1,714
| +922% | +$25.1K |
|
1320
PUT
Caesars Entertainment
CZR
$6.1B
| $2.12M | 0.01% |
455
+433
| +1,968% | +$19.8K |
|
|
AMWD
1321
CALL
DELISTED
American Woodmark
AMWD
| $2.12M | 0.01% |
257
+256
| +25,600% | +$19.1K |
|
1322
VanEck Gold Miners ETF
GDX
$23B
| $2.12M | 0.01% |
+94,716
| New | +$2.08M |
|
1323
CALL
PagSeguro Digital
PAGS
$2.57B
| $2.12M | 0.01% |
711
+460
| +183% | +$11.5K |
|
|
ULTI
1324
PUT
DELISTED
Ultimate Software Group Inc
ULTI
| $2.11M | 0.01% |
64
+10
| +19% | +$3.06K |
|
1325
CALL
IPG Photonics
IPGP
$3.89B
| $2.11M | 0.01% |
139
-6
| -4% | -$849 |
|
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.