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 | |
|---|---|---|---|---|---|---|
|
CZR
2201
PUT
DELISTED
Caesars Entertainment Corporation
CZR
| $784K | ﹤0.01% |
903
-1,123
| -55% | -$9.73K |
|
|
SGEN
2202
PUT
DELISTED
Seagen Inc. Common Stock
SGEN
| $783K | ﹤0.01% |
107
+60
| +128% | +$4.27K |
|
|
CLR
2203
CALL
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $783K | ﹤0.01% |
175
-324
| -65% | -$14.5K |
|
2204
Direxion Daily Junior Gold Miners Index Bear 2X ETF
JDST
$30.4M
| $781K | ﹤0.01% |
4
+2
| +100% | +$412K |
|
|
JKS
2205
CALL
JinkoSolar
JKS
$775M
| $781K | ﹤0.01% |
434
-138
| -24% | -$2.25K |
|
2206
PUT
BBVA Argentina
BBAR
$3.85B
| $779K | ﹤0.01% |
820
+618
| +306% | +$7.32K |
|
2207
PUT
American Electric Power
AEP
$73.7B
| $778K | ﹤0.01% |
93
-112
| -55% | -$8.91K |
|
2208
PUT
Cirrus Logic
CRUS
$6.74B
| $778K | ﹤0.01% |
185
+43
| +30% | +$1.66K |
|
2209
CALL
iShares Gold Trust
IAU
$63B
| $778K | ﹤0.01% |
315
-4
| -1% | -$100 |
|
2210
Nektar Therapeutics
NKTR
$2.39B
| $778K | ﹤0.01% |
1,545
+646
| +72% | +$383K |
|
2211
PUT
AXIS Capital
AXS
$8.59B
| $777K | ﹤0.01% |
142
+131
| +1,191% | +$7.26K |
|
2212
Tapestry
TPR
$28.8B
| $776K | ﹤0.01% |
23,913
+13,048
| +120% | +$457K |
|
2213
Weibo
WB
$1.9B
| $775K | ﹤0.01% |
12,506
-21,217
| -63% | -$1.32M |
|
2214
PUT
Ares Capital
ARCC
$13.5B
| $774K | ﹤0.01% |
452
-31
| -6% | -$519 |
|
|
JKS
2215
PUT
JinkoSolar
JKS
$775M
| $774K | ﹤0.01% |
430
+172
| +67% | +$2.8K |
|
2216
CALL
Pentair
PNR
$10.2B
| $774K | ﹤0.01% |
174
+158
| +988% | +$6.58K |
|
2217
CALL
CF Industries
CF
$19.2B
| $772K | ﹤0.01% |
189
-156
| -45% | -$6.62K |
|
2218
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $770K | ﹤0.01% |
98
+39
| +66% | +$2.94K |
|
|
AL
2219
PUT
DELISTED
Air Lease Corp
AL
| $769K | ﹤0.01% |
224
+223
| +22,300% | +$8.04K |
|
|
RDS.A
2220
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $769K | ﹤0.01% |
12,301
-106,871
| -90% | -$6.61M |
|
2221
PUT
First Financial Bankshares
FFIN
$4.97B
| $768K | ﹤0.01% |
266
+136
| +105% | +$4.15K |
|
2222
PUT
Kornit Digital
KRNT
$706M
| $768K | ﹤0.01% |
323
+138
| +75% | +$2.93K |
|
2223
PDF Solutions
PDFS
$2.13B
| $767K | ﹤0.01% |
62,125
+29,664
| +91% | +$328K |
|
2224
Direxion Daily S&P Biotech Bull 3X ETF
LABU
$571M
| $765K | ﹤0.01% |
639
+280
| +78% | +$291K |
|
2225
PUT
Solid Biosciences
SLDB
$771M
| $765K | ﹤0.01% |
55
+19
| +53% | +$4.76K |
|
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.