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 | |
|---|---|---|---|---|---|---|
1176
CALL
HSBC
HSBC
$355B
| $2.5M | 0.01% |
622
-183
| -23% | -$7.37K |
|
1177
PUT
Phillips 66
PSX
$82.9B
| $2.49M | 0.01% |
262
-428
| -62% | -$40.7K |
|
|
VIAB
1178
DELISTED
Viacom Inc. Class B
VIAB
| $2.49M | 0.01% |
88,757
+65,537
| +282% | +$1.88M |
|
1179
CALL
Westlake Corp
WLK
$9.46B
| $2.49M | 0.01% |
367
+304
| +483% | +$22K |
|
1180
KB Home
KBH
$3.48B
| $2.49M | 0.01% |
102,958
-14,776
| -13% | -$327K |
|
1181
CALL
Middleby
MIDD
$6.05B
| $2.48M | 0.01% |
191
+142
| +290% | +$17K |
|
|
CS
1182
PUT
DELISTED
Credit Suisse Group
CS
| $2.48M | 0.01% |
2,132
-825
| -28% | -$9.84K |
|
1183
PUT
Stellantis
STLA
$16.5B
| $2.48M | 0.01% |
1,672
-1,025
| -38% | -$15.8K |
|
1184
CALL
Vodafone
VOD
$34.9B
| $2.48M | 0.01% |
1,365
-1,417
| -51% | -$26.3K |
|
|
PPLI
1185
CALL
People Inc
PPLI
$3.1B
| $2.48M | 0.01% |
660
+22
| +3% | +$814 |
|
1186
PUT
Amphenol
APH
$188B
| $2.47M | 0.01% |
1,048
+20
| +2% | +$447 |
|
1187
CALL
Motorola Solutions
MSI
$69.4B
| $2.47M | 0.01% |
176
+121
| +220% | +$15.7K |
|
1188
CALL
Deutsche Bank
DB
$66.3B
| $2.47M | 0.01% |
3,041
+2,387
| +365% | +$20.9K |
|
1189
CALL
FIVE9
FIVN
$1.77B
| $2.47M | 0.01% |
467
+441
| +1,696% | +$22.4K |
|
1190
CALL
Sempra
SRE
$60.8B
| $2.47M | 0.01% |
392
+124
| +46% | +$7.3K |
|
1191
CALL
Viking Therapeutics
VKTX
$4.04B
| $2.46M | 0.01% |
2,473
+1,687
| +215% | +$14.1K |
|
1192
CALL
DTE Energy
DTE
$31.1B
| $2.46M | 0.01% |
231
+144
| +166% | +$14.5K |
|
1193
Northrop Grumman
NOC
$77B
| $2.46M | 0.01% |
9,110
-14,495
| -61% | -$3.95M |
|
1194
CALL
Hain Celestial
HAIN
$47.8M
| $2.46M | 0.01% |
1,062
+946
| +816% | +$18.2K |
|
1195
PUT
Dominion Energy
D
$62.5B
| $2.45M | 0.01% |
320
+207
| +183% | +$15.1K |
|
1196
Gilead Sciences
GILD
$161B
| $2.45M | 0.01% |
37,717
+18,841
| +100% | +$1.25M |
|
1197
CALL
TD Synnex
SNX
$19.4B
| $2.45M | 0.01% |
514
+494
| +2,470% | +$23.4K |
|
1198
CALL
Regions Financial
RF
$26.3B
| $2.44M | 0.01% |
1,728
+983
| +132% | +$15.1K |
|
1199
CALL
StoneCo
STNE
$2.62B
| $2.44M | 0.01% |
+594
| New | +$16.1K |
|
1200
PUT
Willis Towers Watson
WTW
$27.9B
| $2.44M | 0.01% |
139
+121
| +672% | +$20.1K |
|
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.