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 | |
|---|---|---|---|---|---|---|
1201
CALL
Pinduoduo
PDD
$118B
| $2.44M | 0.01% |
982
+416
| +73% | +$11.2K |
|
|
SMAR
1202
PUT
DELISTED
Smartsheet Inc.
SMAR
| $2.43M | 0.01% |
596
+571
| +2,284% | +$19.7K |
|
1203
PUT
Helmerich & Payne
HP
$3.53B
| $2.43M | 0.01% |
437
+64
| +17% | +$3.49K |
|
1204
Oracle
ORCL
$331B
| $2.42M | 0.01% |
45,096
-45,903
| -50% | -$2.34M |
|
|
HUYA
1205
PUT
Huya Inc
HUYA
$542M
| $2.42M | 0.01% |
859
+302
| +54% | +$6.75K |
|
1206
PUT
Extra Space Storage
EXR
$31.2B
| $2.42M | 0.01% |
237
+230
| +3,286% | +$22.1K |
|
1207
NIO
NIO
$11.3B
| $2.41M | 0.01% |
+472,688
| New | +$3.35M |
|
|
LNW
1208
CALL
DELISTED
Light & Wonder
LNW
| $2.4M | 0.01% |
1,177
-53
| -4% | -$1.27K |
|
1209
PUT
Aon
AON
$77.3B
| $2.39M | 0.01% |
140
+59
| +73% | +$9.57K |
|
1210
CALL
Liberty Media Series A
FWONA
$22.3B
| $2.39M | 0.01% |
659
+551
| +510% | +$16.7K |
|
|
LXFT
1211
CALL
DELISTED
Luxoft Holding, Inc.
LXFT
| $2.39M | 0.01% |
+407
| New | +$23.1K |
|
1212
Burlington
BURL
$22B
| $2.39M | 0.01% |
+15,238
| New | +$2.46M |
|
|
HOME
1213
DELISTED
At Home Group Inc.
HOME
| $2.39M | 0.01% |
133,677
+118,065
| +756% | +$2.62M |
|
1214
CALL
Celanese
CE
$5.09B
| $2.39M | 0.01% |
242
+201
| +490% | +$19.8K |
|
1215
PUT
NetApp
NTAP
$32.9B
| $2.38M | 0.01% |
344
-121
| -26% | -$7.81K |
|
1216
Cardinal Health
CAH
$53.4B
| $2.38M | 0.01% |
+49,496
| New | +$2.48M |
|
1217
Ionis Pharmaceuticals
IONS
$9.35B
| $2.38M | 0.01% |
29,368
-4,144
| -12% | -$267K |
|
1218
PUT
Madrigal Pharmaceuticals
MDGL
$12.6B
| $2.38M | 0.01% |
190
+130
| +217% | +$16.2K |
|
|
RTN
1219
DELISTED
Raytheon Company
RTN
| $2.38M | 0.01% |
+13,048
| New | +$2.27M |
|
1220
PUT
MPLX
MPLX
$59.5B
| $2.37M | 0.01% |
722
+165
| +30% | +$5.54K |
|
|
DISH
1221
CALL
DELISTED
DISH Network Corp.
DISH
| $2.37M | 0.01% |
749
+61
| +9% | +$1.87K |
|
1222
NetEase
NTES
$76.5B
| $2.37M | 0.01% |
+49,070
| New | +$2.33M |
|
1223
CALL
Zimmer Biomet
ZBH
$17.7B
| $2.36M | 0.01% |
191
+142
| +290% | +$16.1K |
|
|
JOYY
1224
CALL
JOYY Inc
JOYY
$3.73B
| $2.36M | 0.01% |
281
+46
| +20% | +$3.34K |
|
|
WBC
1225
CALL
DELISTED
WABCO HOLDINGS INC.
WBC
| $2.36M | 0.01% |
179
+171
| +2,138% | +$21.1K |
|
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.