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 | |
|---|---|---|---|---|---|---|
376
PUT
Trip.com Group
TCOM
$26.8B
| $10.4M | 0.03% |
2,386
+1,536
| +181% | +$53.9K |
|
377
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $10.4M | 0.03% |
29,570
+9,720
| +49% | +$109K |
|
378
PUT
Vanguard FTSE Europe ETF
VGK
$30.2B
| $10.4M | 0.03% |
2,377
+715
| +43% | +$37.4K |
|
379
CALL
Simon Property Group
SPG
$73.4B
| $10.4M | 0.03% |
569
+192
| +51% | +$34.1K |
|
380
CALL
Carvana
CVNA
$44.9B
| $10.4M | 0.03% |
8,920
+5,290
| +146% | +$44.5K |
|
381
PUT
DuPont de Nemours
DD
$18.9B
| $10.3M | 0.03% |
765
-341
| -31% | -$47.3K |
|
|
PXD
382
PUT
DELISTED
Pioneer Natural Resource Co.
PXD
| $10.3M | 0.03% |
676
-29
| -4% | -$4.09K |
|
383
PUT
Burlington
BURL
$22.3B
| $10.3M | 0.03% |
657
+122
| +23% | +$19.7K |
|
384
CALL
CME Group
CME
$90.1B
| $10.3M | 0.03% |
625
-190
| -23% | -$33.6K |
|
|
STMP
385
PUT
DELISTED
Stamps.com, Inc.
STMP
| $10.3M | 0.03% |
1,260
+1,148
| +1,025% | +$162K |
|
386
CALL
Halliburton
HAL
$27.6B
| $10.2M | 0.03% |
3,498
-1,566
| -31% | -$47.3K |
|
387
PUT
MetLife
MET
$60B
| $10.2M | 0.03% |
2,407
+755
| +46% | +$33.4K |
|
388
PUT
Kohl's
KSS
$2.16B
| $10.2M | 0.03% |
1,479
-170
| -10% | -$11.5K |
|
|
WCG
389
CALL
DELISTED
Wellcare Health Plans, Inc.
WCG
| $10.2M | 0.03% |
377
+238
| +171% | +$61.5K |
|
390
PUT
Take-Two Interactive
TTWO
$43.4B
| $10.2M | 0.03% |
1,077
+341
| +46% | +$33.1K |
|
391
PUT
Illumina
ILMN
$28.9B
| $10.1M | 0.03% |
333
-232
| -41% | -$67.7K |
|
392
PUT
PNC Financial Services
PNC
$101B
| $10M | 0.03% |
819
+195
| +31% | +$24.1K |
|
393
PUT
Ralph Lauren
RL
$23B
| $10M | 0.03% |
773
-50
| -6% | -$5.95K |
|
394
CALL
ProShares UltraShort Industrials
SIJ
$5.96M
| $9.97M | 0.03% |
437
-282
| -39% | -$71K |
|
395
CALL
RTX Corp
RTX
$262B
| $9.94M | 0.03% |
+1,225
| New | +$93.1K |
|
396
CALL
iQIYI
IQ
$1.2B
| $9.93M | 0.03% |
4,153
+1,361
| +49% | +$30.1K |
|
397
PUT
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $9.91M | 0.03% |
4,730
+1,268
| +37% | +$58.1K |
|
|
K
398
CALL
DELISTED
Kellanova
K
| $9.86M | 0.03% |
1,830
+565
| +45% | +$30.2K |
|
399
PUT
Sarepta Therapeutics
SRPT
$1.67B
| $9.86M | 0.03% |
827
+202
| +32% | +$26K |
|
400
CALL
Trade Desk
TTD
$8.26B
| $9.82M | 0.03% |
4,960
+1,820
| +58% | +$29.8K |
|
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.