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 | |
|---|---|---|---|---|---|---|
|
ABB
1451
CALL
DELISTED
ABB Ltd
ABB
| $1.82M | 0.01% |
965
+901
| +1,408% | +$17.4K |
|
|
PRAH
1452
PUT
DELISTED
PRA Health Sciences, Inc.
PRAH
| $1.82M | 0.01% |
165
+163
| +8,150% | +$17K |
|
1453
CALL
CenterPoint Energy
CNP
$29.1B
| $1.81M | 0.01% |
591
+575
| +3,594% | +$17.4K |
|
1454
CALL
Dentsply Sirona
XRAY
$2.59B
| $1.81M | 0.01% |
366
-49
| -12% | -$2.16K |
|
1455
PUT
YPF
YPF
$20.2B
| $1.81M | 0.01% |
1,295
+65
| +5% | +$953 |
|
1456
PUT
Chegg
CHGG
$108M
| $1.81M | 0.01% |
475
+200
| +73% | +$7.29K |
|
1457
PUT
Tucows
TCX
$97.1M
| $1.81M | 0.01% |
223
+158
| +243% | +$11.5K |
|
1458
PUT
Old Dominion Freight Line
ODFL
$48.5B
| $1.8M | 0.01% |
375
-900
| -71% | -$42.1K |
|
|
1459
CALL
YPF
YPF
$20.2B
| $1.8M | 0.01% |
1,288
+543
| +73% | +$7.96K |
|
1460
CALL
BHP
BHP
$213B
| $1.8M | 0.01% |
370
-821
| -69% | -$37.4K |
|
|
GWPH
1461
PUT
DELISTED
GW Pharmaceuticals Plc American Depositary Shares
GWPH
| $1.8M | 0.01% |
107
-49
| -31% | -$7.29K |
|
|
GAP
1462
The Gap Inc
GAP
$6.84B
| $1.8M | 0.01% |
+68,699
| New | +$1.76M |
|
1463
Penumbra
PEN
$12.5B
| $1.8M | 0.01% |
+12,225
| New | +$1.75M |
|
1464
Honeywell
HON
$77.1B
| $1.79M | 0.01% |
11,988
+9,617
| +406% | +$1.34M |
|
|
WLL
1465
CALL
DELISTED
Whiting Petroleum Corporation
WLL
| $1.79M | 0.01% |
9
-6
| -40% | -$12.1K |
|
1466
Edison International
EIX
$30.7B
| $1.79M | 0.01% |
+28,961
| New | +$1.73M |
|
1467
ING
ING
$93.8B
| $1.79M | 0.01% |
+147,750
| New | +$1.79M |
|
|
AZPN
1468
CALL
DELISTED
ASPEN TECHNOLOGY INC
AZPN
| $1.79M | 0.01% |
172
+78
| +83% | +$813K |
|
1469
PUT
JetBlue
JBLU
$1.96B
| $1.79M | 0.01% |
1,093
+101
| +10% | +$1.73K |
|
1470
PUT
L3Harris
LHX
$55.9B
| $1.79M | 0.01% |
112
+27
| +32% | +$4.16K |
|
1471
CALL
Huazhu Hotels Group
HTHT
$12.4B
| $1.79M | 0.01% |
424
+385
| +987% | +$13.2K |
|
1472
PUT
GrafTech
EAF
$194M
| $1.78M | 0.01% |
139
+127
| +1,058% | +$16.9K |
|
1473
CALL
Coty
COTY
$2.33B
| $1.78M | ﹤0.01% |
1,548
+664
| +75% | +$6.28K |
|
1474
PUT
Deutsche Bank
DB
$66.3B
| $1.78M | ﹤0.01% |
2,193
-360
| -14% | -$3.15K |
|
1475
D.R. Horton
DHI
$41B
| $1.77M | ﹤0.01% |
42,896
-60,084
| -58% | -$2.35M |
|
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.