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 | |
|---|---|---|---|---|---|---|
1701
CALL
Insperity
NSP
$1.85B
| $1.38M | ﹤0.01% |
112
+73
| +187% | +$8.33K |
|
1702
CALL
Gray Television
GTN
$407M
| $1.38M | ﹤0.01% |
647
+592
| +1,076% | +$11K |
|
1703
Bilibili
BILI
$7.18B
| $1.38M | ﹤0.01% |
72,861
+40,368
| +124% | +$707K |
|
1704
PUT
Insulet
PODD
$11.3B
| $1.38M | ﹤0.01% |
145
-31
| -18% | -$2.66K |
|
|
BBBY
1705
PUT
Bed Bath & Beyond
BBBY
$473M
| $1.38M | ﹤0.01% |
1,103
-406
| -27% | -$5.55K |
|
|
HZNP
1706
CALL
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $1.38M | ﹤0.01% |
521
+300
| +136% | +$7.11K |
|
1707
CALL
Alkermes
ALKS
$8.82B
| $1.38M | ﹤0.01% |
377
+334
| +777% | +$11K |
|
1708
CALL
Howard Hughes
HHH
$3.93B
| $1.38M | ﹤0.01% |
131
-18
| -12% | -$1.86K |
|
1709
PUT
ON Semiconductor
ON
$33.8B
| $1.37M | ﹤0.01% |
668
+21
| +3% | +$433 |
|
1710
PUT
Telephone and Data Systems
TDS
$3.91B
| $1.37M | ﹤0.01% |
447
+367
| +459% | +$12.5K |
|
1711
Atlassian
TEAM
$22B
| $1.37M | ﹤0.01% |
12,207
+10,523
| +625% | +$1.08M |
|
|
MXIM
1712
CALL
DELISTED
Maxim Integrated Products
MXIM
| $1.37M | ﹤0.01% |
258
-220
| -46% | -$11.8K |
|
|
LMNX
1713
CALL
DELISTED
Luminex Corp
LMNX
| $1.37M | ﹤0.01% |
596
+584
| +4,867% | +$14.7K |
|
1714
CALL
Icahn Enterprises
IEP
$5.17B
| $1.37M | ﹤0.01% |
189
+127
| +205% | +$8.86K |
|
1715
PUT
Ameren
AEE
$31.5B
| $1.37M | ﹤0.01% |
+186
| New | +$13K |
|
1716
CALL
Deckers Outdoor
DECK
$13.3B
| $1.37M | ﹤0.01% |
558
+150
| +37% | +$3.41K |
|
1717
PUT
Prologis
PLD
$138B
| $1.37M | ﹤0.01% |
190
-9
| -5% | -$614 |
|
|
HOME
1718
PUT
DELISTED
At Home Group Inc.
HOME
| $1.37M | ﹤0.01% |
765
+173
| +29% | +$3.83K |
|
1719
CALL
Urban Outfitters
URBN
$5.99B
| $1.36M | ﹤0.01% |
460
+236
| +105% | +$7.27K |
|
|
ENV
1720
PUT
DELISTED
ENVESTNET, INC.
ENV
| $1.36M | ﹤0.01% |
+208
| New | +$12K |
|
1721
CALL
Federated Hermes
FHI
$4.4B
| $1.36M | ﹤0.01% |
463
+396
| +591% | +$11K |
|
1722
DexCom
DXCM
$27.6B
| $1.36M | ﹤0.01% |
45,548
+28,204
| +163% | +$991K |
|
1723
CALL
LKQ Corp
LKQ
$6.58B
| $1.36M | ﹤0.01% |
478
+450
| +1,607% | +$12.1K |
|
1724
CALL
Tucows
TCX
$97.1M
| $1.35M | ﹤0.01% |
167
+147
| +735% | +$10.7K |
|
1725
CALL
United Natural Foods
UNFI
$3.01B
| $1.35M | ﹤0.01% |
1,022
+792
| +344% | +$10.7K |
|
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.