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 | |
|---|---|---|---|---|---|---|
251
CALL
Palo Alto Networks
PANW
$273B
| $17.4M | 0.05% |
4,308
-1,212
| -22% | -$45K |
|
|
STZ.B
252
PUT
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $17.4M | 0.05% |
991
-717
| -42% | -$121K |
|
253
PUT
Ionis Pharmaceuticals
IONS
$8.93B
| $17.4M | 0.05% |
2,138
+968
| +83% | +$62.4K |
|
254
CALL
Altria Group
MO
$121B
| $17.3M | 0.05% |
3,021
+796
| +36% | +$40.7K |
|
255
CALL
Comcast
CMCSA
$84B
| $17.3M | 0.05% |
4,331
-1,276
| -23% | -$48K |
|
256
PUT
Gilead Sciences
GILD
$162B
| $17.3M | 0.05% |
2,663
-568
| -18% | -$37.8K |
|
257
PUT
PG&E
PCG
$39.9B
| $17.3M | 0.05% |
9,726
+7,659
| +371% | +$124K |
|
258
PUT
Northrop Grumman
NOC
$74.6B
| $17.3M | 0.05% |
641
-130
| -17% | -$35.5K |
|
|
SPLK
259
PUT
DELISTED
Splunk Inc
SPLK
| $17.2M | 0.05% |
1,380
+350
| +34% | +$43.7K |
|
260
CALL
EOG Resources
EOG
$76.7B
| $17.1M | 0.05% |
1,801
+1,148
| +176% | +$109K |
|
261
PUT
Ferrari
RACE
$65.4B
| $17.1M | 0.05% |
1,281
+124
| +11% | +$15.2K |
|
262
PUT
S&P Global
SPGI
$127B
| $17.1M | 0.05% |
814
+699
| +608% | +$135K |
|
263
CALL
GE Aerospace
GE
$354B
| $17M | 0.05% |
3,411
+241
| +8% | +$11.3K |
|
264
CALL
NXP Semiconductors
NXPI
$70.4B
| $16.9M | 0.05% |
1,910
-3,337
| -64% | -$293K |
|
265
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $16.9M | 0.05% |
411
-192
| -32% | -$79.1K |
|
266
CALL
Oracle
ORCL
$362B
| $16.8M | 0.05% |
3,125
-328
| -9% | -$16.7K |
|
|
RTN
267
CALL
DELISTED
Raytheon Company
RTN
| $16.4M | 0.05% |
903
-107
| -11% | -$18.7K |
|
268
CALL
Illumina
ILMN
$28.9B
| $16.4M | 0.05% |
542
-144
| -21% | -$42K |
|
269
CALL
General Motors
GM
$74.1B
| $16.2M | 0.05% |
4,359
-2,275
| -34% | -$86.4K |
|
|
ABMD
270
PUT
DELISTED
Abiomed Inc
ABMD
| $16.1M | 0.04% |
565
+445
| +371% | +$148K |
|
271
PUT
Delta Air Lines
DAL
$54.9B
| $16.1M | 0.04% |
3,120
-396
| -11% | -$19.6K |
|
|
272
PUT
General Motors
GM
$74.1B
| $16.1M | 0.04% |
4,340
+848
| +24% | +$32.2K |
|
|
ALXN
273
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $16M | 0.04% |
1,187
+714
| +151% | +$88.8K |
|
274
CALL
Rio Tinto
RIO
$150B
| $16M | 0.04% |
2,722
+985
| +57% | +$54.2K |
|
275
PUT
CME Group
CME
$90.1B
| $16M | 0.04% |
970
+688
| +244% | +$122K |
|
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.