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 | |
|---|---|---|---|---|---|---|
326
CALL
Crown Castle
CCI
$33.8B
| $12.5M | 0.03% |
974
+786
| +418% | +$92.2K |
|
327
PUT
Royal Caribbean
RCL
$76.7B
| $12.5M | 0.03% |
1,087
+694
| +177% | +$78.9K |
|
328
CALL
Newmont
NEM
$102B
| $12.4M | 0.03% |
3,466
+1,090
| +46% | +$36.9K |
|
329
PUT
BP
BP
$112B
| $12.4M | 0.03% |
2,875
+880
| +44% | +$36.1K |
|
330
CALL
Papa John's
PZZA
$1.05B
| $12.3M | 0.03% |
2,329
+1,337
| +135% | +$59K |
|
331
PUT
Kroger
KR
$35.3B
| $12.3M | 0.03% |
4,997
+2,720
| +119% | +$74.5K |
|
332
PUT
Target
TGT
$62.6B
| $12.2M | 0.03% |
1,526
-1,534
| -50% | -$112K |
|
|
JJT
333
PUT
DELISTED
iPath Series B Bloomberg Tin Subindex Total ReturnSM ETN
JJT
| $12.2M | 0.03% |
4,322
+3,352
| +346% | +$177K |
|
334
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $12.2M | 0.03% |
663
-154
| -19% | -$28.4K |
|
335
PUT
Nutanix
NTNX
$14.4B
| $12.2M | 0.03% |
3,228
+1,238
| +62% | +$56.6K |
|
336
CALL
CSX Corp
CSX
$92.8B
| $12.1M | 0.03% |
4,836
+246
| +5% | +$5.7K |
|
|
PPLC
337
CALL
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $12M | 0.03% |
5,923
+1,491
| +34% | +$54.1K |
|
|
TIF
338
CALL
DELISTED
Tiffany & Co.
TIF
| $12M | 0.03% |
1,134
+490
| +76% | +$45K |
|
339
PUT
Dollar Tree
DLTR
$23.5B
| $11.9M | 0.03% |
1,135
-662
| -37% | -$65K |
|
340
CALL
ProShares UltraShort Health Care
RXD
$3.38M
| $11.9M | 0.03% |
950
-945
| -50% | -$87.4K |
|
341
PUT
Capital One
COF
$124B
| $11.8M | 0.03% |
1,448
-247
| -15% | -$20.1K |
|
342
PUT
Simon Property Group
SPG
$73.4B
| $11.8M | 0.03% |
647
+123
| +23% | +$21.9K |
|
|
RHT
343
DELISTED
Red Hat Inc
RHT
| $11.8M | 0.03% |
64,525
+63,525
| +6,353% | +$11.4M |
|
|
APC
344
CALL
DELISTED
Anadarko Petroleum
APC
| $11.7M | 0.03% |
2,580
+1,627
| +171% | +$73.8K |
|
345
iShares MSCI Brazil ETF
EWZ
$9.27B
| $11.7M | 0.03% |
285,708
+121,994
| +75% | +$5.24M |
|
346
PUT
Trade Desk
TTD
$8.26B
| $11.7M | 0.03% |
5,900
+3,410
| +137% | +$55.9K |
|
|
IRBT
347
PUT
DELISTED
iRobot
IRBT
| $11.7M | 0.03% |
991
-46
| -4% | -$4.9K |
|
348
PUT
Microchip Technology
MCHP
$46.2B
| $11.6M | 0.03% |
2,804
-22
| -0.8% | -$912 |
|
349
CALL
Regeneron Pharmaceuticals
REGN
$68.3B
| $11.6M | 0.03% |
282
-136
| -33% | -$56K |
|
|
AMRN
350
CALL
Amarin Corp
AMRN
$287M
| $11.5M | 0.03% |
278
-190
| -41% | -$68.5K |
|
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.