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 | |
|---|---|---|---|---|---|---|
526
PUT
Wabtec
WAB
$50B
| $6.94M | 0.02% |
942
+257
| +38% | +$18.5K |
|
527
CALL
Devon Energy
DVN
$53.2B
| $6.94M | 0.02% |
2,199
+256
| +13% | +$7.15K |
|
528
PUT
Pinduoduo
PDD
$117B
| $6.92M | 0.02% |
2,789
+1,056
| +61% | +$28.3K |
|
529
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$709M
| $6.91M | 0.02% |
1,888
+738
| +64% | +$23.5K |
|
530
CALL
PTC
PTC
$13.2B
| $6.89M | 0.02% |
748
+396
| +113% | +$35K |
|
531
CALL
Synchrony
SYF
$23B
| $6.89M | 0.02% |
2,159
+327
| +18% | +$9.84K |
|
532
CALL
Eaton
ETN
$161B
| $6.87M | 0.02% |
853
-233
| -21% | -$17.8K |
|
533
PUT
O'Reilly Automotive
ORLY
$71.2B
| $6.83M | 0.02% |
2,640
-5,700
| -68% | -$138K |
|
534
PUT
Carnival Corporation Ltd
CCL
$34.8B
| $6.83M | 0.02% |
1,346
+493
| +58% | +$27.3K |
|
|
STI
535
CALL
DELISTED
SunTrust Banks, Inc.
STI
| $6.8M | 0.02% |
1,148
+461
| +67% | +$28.2K |
|
536
PUT
Qorvo
QRVO
$7.76B
| $6.79M | 0.02% |
947
+746
| +371% | +$49.4K |
|
537
CALL
Royal Bank of Canada
RY
$289B
| $6.78M | 0.02% |
897
-109
| -11% | -$8.24K |
|
538
PUT
MarketAxess Holdings
MKTX
$4.07B
| $6.74M | 0.02% |
274
-64
| -19% | -$14.5K |
|
|
JOYY
539
PUT
JOYY Inc
JOYY
$3.66B
| $6.72M | 0.02% |
800
+369
| +86% | +$26.8K |
|
540
CALL
Campbell Soup
CPB
$6.44B
| $6.68M | 0.02% |
1,752
-458
| -21% | -$16.2K |
|
541
CALL
Dollar General
DG
$25.6B
| $6.68M | 0.02% |
560
+338
| +152% | +$39.3K |
|
|
MASI
542
PUT
DELISTED
Masimo
MASI
| $6.65M | 0.02% |
481
+479
| +23,950% | +$60.1K |
|
543
CALL
Sarepta Therapeutics
SRPT
$1.68B
| $6.65M | 0.02% |
558
-101
| -15% | -$13K |
|
544
PUT
XPO
XPO
$24.9B
| $6.64M | 0.02% |
3,571
+1,417
| +66% | +$27.2K |
|
545
Wayfair
W
$10.6B
| $6.6M | 0.02% |
+44,463
| New | +$5.8M |
|
546
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $6.6M | 0.02% |
191
-543
| -74% | -$183K |
|
547
GE Aerospace
GE
$360B
| $6.58M | 0.02% |
132,178
-34,851
| -21% | -$1.64M |
|
548
PUT
Children's Place
PLCE
$60M
| $6.54M | 0.02% |
672
+630
| +1,500% | +$57.4K |
|
549
PUT
Abbott
ABT
$176B
| $6.53M | 0.02% |
817
-1,319
| -62% | -$98.1K |
|
550
PUT
Equinix
EQIX
$102B
| $6.53M | 0.02% |
144
-92
| -39% | -$37.5K |
|
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.