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 | |
|---|---|---|---|---|---|---|
476
PUT
TSMC
TSM
$2.18T
| $7.68M | 0.02% |
1,875
+180
| +11% | +$6.87K |
|
477
CALL
Paycom
PAYC
$6.5B
| $7.68M | 0.02% |
406
-15
| -4% | -$2.44K |
|
478
PUT
McCormick & Company Non-Voting
MKC
$14B
| $7.67M | 0.02% |
1,018
+802
| +371% | +$54.1K |
|
479
CALL
Mercado Libre
MELI
$91.2B
| $7.67M | 0.02% |
151
-177
| -54% | -$70.6K |
|
480
PUT
Domino's
DPZ
$10.6B
| $7.67M | 0.02% |
297
+77
| +35% | +$20K |
|
481
PUT
Lennox International
LII
$18.5B
| $7.61M | 0.02% |
288
+218
| +311% | +$52.1K |
|
482
CALL
American Tower
AMT
$77.4B
| $7.61M | 0.02% |
386
-155
| -29% | -$27.2K |
|
483
PUT
Stanley Black & Decker
SWK
$13.9B
| $7.58M | 0.02% |
557
+219
| +65% | +$28.6K |
|
484
PUT
Thermo Fisher Scientific
TMO
$196B
| $7.58M | 0.02% |
277
-400
| -59% | -$99.5K |
|
485
PUT
Southwest Airlines
LUV
$23.3B
| $7.55M | 0.02% |
1,454
+837
| +136% | +$44.2K |
|
|
HES
486
PUT
DELISTED
Hess
HES
| $7.55M | 0.02% |
1,253
+306
| +32% | +$16.8K |
|
487
CALL
Cognizant
CTSH
$20.4B
| $7.53M | 0.02% |
1,040
+160
| +18% | +$11.2K |
|
488
CALL
iShares Silver Trust
SLV
$28.8B
| $7.53M | 0.02% |
5,311
+1,692
| +47% | +$24.7K |
|
489
PUT
Skyworks Solutions
SWKS
$9.5B
| $7.53M | 0.02% |
913
+284
| +45% | +$21.9K |
|
|
GRUB
490
PUT
DELISTED
Just Eat Takeaway.com N.V. American Depositary Shares
GRUB
| $7.5M | 0.02% |
540
-15
| -3% | -$2.32K |
|
|
AABA
491
PUT
DELISTED
Altaba Inc
AABA
| $7.5M | 0.02% |
1,012
-74
| -7% | -$5.09K |
|
|
AZPN
492
PUT
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $7.5M | 0.02% |
719
+208
| +41% | +$2.17M |
|
493
CALL
Dell
DELL
$285B
| $7.49M | 0.02% |
2,518
+1,291
| +105% | +$34K |
|
494
PUT
WIX.com
WIX
$2.04B
| $7.44M | 0.02% |
616
+218
| +55% | +$23.7K |
|
495
CALL
Corning
GLW
$133B
| $7.4M | 0.02% |
2,237
+1,032
| +86% | +$33.9K |
|
|
FISV
496
PUT
Fiserv Inc
FISV
$26.8B
| $7.39M | 0.02% |
837
+652
| +352% | +$53.8K |
|
497
PUT
Bread Financial
BFH
$4.12B
| $7.38M | 0.02% |
529
+77
| +17% | +$10.5K |
|
498
PUT
Capri Holdings
CPRI
$1.86B
| $7.37M | 0.02% |
1,612
+897
| +125% | +$39.2K |
|
499
CALL
Linde
LIN
$235B
| $7.37M | 0.02% |
419
+247
| +144% | +$41K |
|
500
PUT
Becton Dickinson
BDX
$42.2B
| $7.37M | 0.02% |
302
+74
| +32% | +$17.5K |
|
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.