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 | |
|---|---|---|---|---|---|---|
1401
CALL
Ionis Pharmaceuticals
IONS
$9.35B
| $1.94M | 0.01% |
239
+75
| +46% | +$4.84K |
|
1402
Centene
CNC
$31.3B
| $1.94M | 0.01% |
36,497
-13,557
| -27% | -$823K |
|
1403
CALL
SBA Communications
SBAC
$18.4B
| $1.94M | 0.01% |
97
-147
| -60% | -$26.6K |
|
|
SIVB
1404
CALL
DELISTED
SVB Financial Group
SIVB
| $1.93M | 0.01% |
87
-54
| -38% | -$12.6K |
|
1405
CALL
Delek US
DK
$3.87B
| $1.93M | 0.01% |
530
+78
| +17% | +$2.65K |
|
1406
PUT
CRH
CRH
$66.7B
| $1.93M | 0.01% |
622
+495
| +390% | +$14.8K |
|
1407
Roku
ROKU
$21.1B
| $1.93M | 0.01% |
29,899
-215,181
| -88% | -$11.5M |
|
|
FNSR
1408
CALL
DELISTED
Finisar Corp
FNSR
| $1.93M | 0.01% |
832
+362
| +77% | +$8.26K |
|
1409
CALL
National Health Investors
NHI
$3.9B
| $1.92M | 0.01% |
245
-103
| -30% | -$8.19K |
|
1410
Morgan Stanley
MS
$337B
| $1.92M | 0.01% |
+45,437
| New | +$1.91M |
|
1411
CALL
Owens Corning
OC
$11.5B
| $1.92M | 0.01% |
407
+218
| +115% | +$10.7K |
|
|
SEE
1412
CALL
DELISTED
Sealed Air
SEE
| $1.92M | 0.01% |
416
+301
| +262% | +$12.5K |
|
|
FTCH
1413
PUT
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $1.92M | 0.01% |
712
+613
| +619% | +$13.7K |
|
|
I
1414
PUT
DELISTED
INTELSAT S. A.
I
| $1.91M | 0.01% |
1,222
+603
| +97% | +$12.8K |
|
1415
PUT
Huntington Bancshares
HBAN
$35.1B
| $1.91M | 0.01% |
1,508
+1,439
| +2,086% | +$19.3K |
|
1416
Kroger
KR
$34.8B
| $1.91M | 0.01% |
77,722
+12,780
| +20% | +$350K |
|
1417
TripAdvisor
TRIP
$1.59B
| $1.91M | 0.01% |
+37,117
| New | +$2.03M |
|
1418
CALL
Copart
CPRT
$25.9B
| $1.91M | 0.01% |
+1,260
| New | +$17.1K |
|
1419
DaVita
DVA
$15.1B
| $1.91M | 0.01% |
35,140
+11,969
| +52% | +$662K |
|
1420
CALL
3D Systems Corp
DDD
$420M
| $1.9M | 0.01% |
1,764
+715
| +68% | +$8.5K |
|
|
PTR
1421
PUT
DELISTED
PETROCHINA COMPANY LIMITED ADS (REP 100 H SHARES)
PTR
| $1.9M | 0.01% |
290
-13
| -4% | -$841 |
|
1422
PUT
Johnson Controls International
JCI
$87.5B
| $1.9M | 0.01% |
513
+59
| +13% | +$2.02K |
|
1423
PUT
Franco-Nevada
FNV
$41.4B
| $1.89M | 0.01% |
252
-452
| -64% | -$33.5K |
|
1424
PUT
Caesarstone
CSTE
$72.3M
| $1.88M | 0.01% |
1,203
-100
| -8% | -$1.56K |
|
|
LLL
1425
CALL
DELISTED
L3 Technologies, Inc.
LLL
| $1.88M | 0.01% |
91
+34
| +60% | +$6.74K |
|
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.