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 | |
|---|---|---|---|---|---|---|
1126
PUT
Baxter International
BAX
$11.6B
| $2.64M | 0.01% |
325
-224
| -41% | -$16.3K |
|
1127
Williams-Sonoma
WSM
$26.7B
| $2.64M | 0.01% |
+93,938
| New | +$2.59M |
|
|
GWR
1128
CALL
DELISTED
Genesee & Wyoming Inc.
GWR
| $2.64M | 0.01% |
303
+266
| +719% | +$21.6K |
|
1129
PUT
Ligand Pharmaceuticals
LGND
$6.02B
| $2.64M | 0.01% |
337
+233
| +224% | +$17.7K |
|
1130
PUT
ArcelorMittal
MT
$50.4B
| $2.64M | 0.01% |
1,295
-53
| -4% | -$1.17K |
|
|
I
1131
CALL
DELISTED
INTELSAT S. A.
I
| $2.64M | 0.01% |
1,685
+737
| +78% | +$15.6K |
|
1132
PUT
Tandem Diabetes Care
TNDM
$1.17B
| $2.63M | 0.01% |
415
-47
| -10% | -$2.47K |
|
|
AVLR
1133
CALL
DELISTED
Avalara, Inc.
AVLR
| $2.63M | 0.01% |
472
+301
| +176% | +$14K |
|
1134
PUT
DexCom
DXCM
$27.6B
| $2.63M | 0.01% |
884
+488
| +123% | +$17.1K |
|
1135
PUT
Church & Dwight Co
CHD
$23.1B
| $2.63M | 0.01% |
369
-268
| -42% | -$17.6K |
|
|
JWN
1136
CALL
DELISTED
Nordstrom
JWN
| $2.63M | 0.01% |
592
+57
| +11% | +$2.6K |
|
|
LHCG
1137
CALL
DELISTED
LHC Group LLC
LHCG
| $2.63M | 0.01% |
237
-4
| -2% | -$427 |
|
1138
PUT
Chemed
CHE
$6.78B
| $2.62M | 0.01% |
+82
| New | +$25.2K |
|
1139
CALL
Scorpio Tankers
STNG
$3.96B
| $2.62M | 0.01% |
1,323
+1,274
| +2,600% | +$24.2K |
|
1140
CALL
Ascendis Pharma A/S
ASND
$16.7B
| $2.6M | 0.01% |
221
+169
| +325% | +$14.8K |
|
1141
Pfizer
PFE
$140B
| $2.6M | 0.01% |
64,512
+64,196
| +20,315% | +$2.57M |
|
1142
PUT
AstraZeneca
AZN
$263B
| $2.6M | 0.01% |
321
+180
| +128% | +$14.2K |
|
1143
CALL
C.H. Robinson
CHRW
$22B
| $2.59M | 0.01% |
298
-15
| -5% | -$1.32K |
|
1144
CALL
Toronto Dominion Bank
TD
$198B
| $2.59M | 0.01% |
476
-369
| -44% | -$20.4K |
|
1145
iShares Biotechnology ETF
IBB
$9.31B
| $2.58M | 0.01% |
23,113
+14,892
| +181% | +$1.63M |
|
1146
CALL
Newell Brands
NWL
$2.16B
| $2.58M | 0.01% |
1,684
-395
| -19% | -$7.26K |
|
1147
RTX Corp
RTX
$287B
| $2.58M | 0.01% |
+31,845
| New | +$2.42M |
|
1148
CALL
Verisk Analytics
VRSK
$26.4B
| $2.58M | 0.01% |
194
-28
| -13% | -$3.41K |
|
1149
CALL
Liberty Global Class C
LBTYK
$3.25B
| $2.58M | 0.01% |
1,039
+197
| +23% | +$4.67K |
|
1150
CALL
Zillow
Z
$7.04B
| $2.58M | 0.01% |
744
-103
| -12% | -$3.67K |
|
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.