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 | |
|---|---|---|---|---|---|---|
726
Constellation Brands
STZ
$22.1B
| $4.64M | 0.01% |
+26,480
| New | +$4.46M |
|
727
PUT
Expeditors International
EXPD
$23B
| $4.64M | 0.01% |
611
+562
| +1,147% | +$40.6K |
|
728
PUT
New Oriental
EDU
$7.85B
| $4.63M | 0.01% |
514
-371
| -42% | -$27.9K |
|
729
CALL
Knight Transportation
KNX
$11.8B
| $4.63M | 0.01% |
1,416
+913
| +182% | +$29.1K |
|
|
ETFC
730
CALL
DELISTED
E*Trade Financial Corporation
ETFC
| $4.62M | 0.01% |
996
-912
| -48% | -$43.4K |
|
731
CALL
Casey's General Stores
CASY
$32.4B
| $4.62M | 0.01% |
359
+352
| +5,029% | +$46K |
|
732
CALL
Chubb
CB
$137B
| $4.62M | 0.01% |
330
-265
| -45% | -$35.3K |
|
733
PUT
Yelp
YELP
$1.35B
| $4.62M | 0.01% |
1,339
-666
| -33% | -$24.1K |
|
734
PUT
Interactive Brokers
IBKR
$40.9B
| $4.62M | 0.01% |
3,560
+1,980
| +125% | +$26K |
|
735
PUT
Monster Beverage
MNST
$91.5B
| $4.61M | 0.01% |
1,688
+1,470
| +674% | +$41.9K |
|
736
CALL
Southern Company
SO
$109B
| $4.6M | 0.01% |
891
-630
| -41% | -$30.9K |
|
737
American Tower
AMT
$76.7B
| $4.6M | 0.01% |
+23,356
| New | +$4.1M |
|
738
CALL
Seagate
STX
$207B
| $4.6M | 0.01% |
961
-1,071
| -53% | -$47.5K |
|
739
CALL
Willis Towers Watson
WTW
$27.2B
| $4.6M | 0.01% |
262
+163
| +165% | +$27.1K |
|
740
Philip Morris
PM
$298B
| $4.59M | 0.01% |
51,986
+51,686
| +17,229% | +$4.16M |
|
741
CALL
ResMed
RMD
$27.8B
| $4.59M | 0.01% |
442
+222
| +101% | +$22.9K |
|
742
CALL
Domino's
DPZ
$10.7B
| $4.59M | 0.01% |
178
+51
| +40% | +$13.3K |
|
743
CALL
Idexx Laboratories
IDXX
$42.5B
| $4.56M | 0.01% |
204
-115
| -36% | -$23.7K |
|
|
EXAS
744
PUT
DELISTED
Exact Sciences
EXAS
| $4.55M | 0.01% |
525
-556
| -51% | -$47.3K |
|
745
CALL
NetEase
NTES
$76.9B
| $4.54M | 0.01% |
940
-930
| -50% | -$44.2K |
|
|
SKX
746
CALL
DELISTED
Skechers
SKX
| $4.54M | 0.01% |
1,350
+1,191
| +749% | +$35.6K |
|
747
PUT
Illinois Tool Works
ITW
$79.7B
| $4.54M | 0.01% |
316
+99
| +46% | +$13.7K |
|
|
ACB
748
PUT
Aurora Cannabis
ACB
$167M
| $4.53M | 0.01% |
42
+28
| +200% | +$25K |
|
749
CALL
Enterprise Products Partners
EPD
$83.9B
| $4.53M | 0.01% |
1,557
+363
| +30% | +$10.1K |
|
|
APC
750
DELISTED
Anadarko Petroleum
APC
| $4.51M | 0.01% |
+99,243
| New | +$4.5M |
|
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.