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 | |
|---|---|---|---|---|---|---|
176
PUT
Western Digital
WDC
$192B
| $24.5M | 0.07% |
6,747
+3,855
| +133% | +$132K |
|
|
UCD
177
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $24.4M | 0.07% |
6,480
-2,107
| -25% | -$7.93M |
|
|
TWTR
178
PUT
DELISTED
Twitter, Inc.
TWTR
| $24.4M | 0.07% |
7,414
-16
| -0.2% | -$507 |
|
179
CALL
Ulta Beauty
ULTA
$20.8B
| $24.3M | 0.07% |
696
+419
| +151% | +$127K |
|
180
CALL
Pfizer
PFE
$142B
| $24.1M | 0.07% |
5,992
-1,666
| -22% | -$66.7K |
|
181
PUT
American Tower
AMT
$77.4B
| $24.1M | 0.07% |
1,225
+308
| +34% | +$54K |
|
182
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $24M | 0.07% |
4,986
+1,113
| +29% | +$21.5K |
|
183
PUT
Lowe's Companies
LOW
$115B
| $23.7M | 0.07% |
2,166
-1,371
| -39% | -$137K |
|
184
PUT
United Airlines
UAL
$38B
| $23.7M | 0.07% |
2,971
+224
| +8% | +$18.9K |
|
185
CALL
Texas Instruments
TXN
$267B
| $23.5M | 0.07% |
2,216
-871
| -28% | -$90.2K |
|
186
PUT
Autodesk
ADSK
$43B
| $23.4M | 0.07% |
1,503
+177
| +13% | +$26.5K |
|
187
PUT
Electronic Arts
EA
$52.4B
| $23.4M | 0.07% |
2,299
-1,428
| -38% | -$135K |
|
188
PUT
Workday
WDAY
$32.7B
| $23.2M | 0.06% |
1,202
-335
| -22% | -$60.9K |
|
189
PUT
Newmont
NEM
$102B
| $22.9M | 0.06% |
6,408
+4,189
| +189% | +$142K |
|
190
CALL
Accenture
ACN
$85.7B
| $22.9M | 0.06% |
1,302
+417
| +47% | +$65.5K |
|
191
PUT
RTX Corp
RTX
$262B
| $22.8M | 0.06% |
+2,816
| New | +$214K |
|
192
PUT
Comcast
CMCSA
$84.1B
| $22.8M | 0.06% |
5,712
-19
| -0.3% | -$715 |
|
|
193
PUT
Texas Instruments
TXN
$267B
| $22.7M | 0.06% |
2,143
+666
| +45% | +$69K |
|
|
194
PUT
Pfizer
PFE
$142B
| $22.4M | 0.06% |
5,568
+622
| +13% | +$24.9K |
|
195
CALL
Roku
ROKU
$21.2B
| $22.3M | 0.06% |
3,454
+1,144
| +50% | +$61.2K |
|
196
CALL
Delta Air Lines
DAL
$54.9B
| $22.2M | 0.06% |
4,304
+166
| +4% | +$8.23K |
|
197
PUT
GE Aerospace
GE
$354B
| $22.2M | 0.06% |
4,463
-63
| -1% | -$2.97K |
|
198
CALL
JD.com
JD
$40.7B
| $22.2M | 0.06% |
7,352
-496
| -6% | -$12.6K |
|
|
199
CALL
Western Digital
WDC
$192B
| $21.9M | 0.06% |
6,032
+1,858
| +45% | +$63.6K |
|
200
CALL
American Express
AXP
$238B
| $21.5M | 0.06% |
1,967
+214
| +12% | +$22.5K |
|
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.