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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
226
CALL
Ambarella
AMBA
$3.09B
| $739K | 0.09% |
383
-56
| -13% | -$3.4K |
|
227
HP
HPQ
$23B
| $737K | 0.09% |
+52,143
| New | +$860K |
|
228
Stanley Black & Decker
SWK
$13.9B
| $736K | 0.09% |
+7,728
| New | +$740K |
|
|
SIAL
229
DELISTED
SIGMA - ALDRICH CORP
SIAL
| $736K | 0.09% |
+5,325
| New | +$734K |
|
|
RSX
230
DELISTED
VanEck Russia ETF
RSX
| $731K | 0.09% |
+42,947
| New | +$701K |
|
|
AGU
231
DELISTED
Agrium
AGU
| $731K | 0.09% |
+7,013
| New | +$749K |
|
232
CALL
CVS Health
CVS
$139B
| $730K | 0.08% |
1,099
+678
| +161% | +$68.6K |
|
233
Johnson & Johnson
JNJ
$617B
| $722K | 0.08% |
7,182
-13,406
| -65% | -$1.36M |
|
234
PUT
VanEck International High Yield Bond ETF
IHY
$43.1M
| $716K | 0.08% |
2,169
+1,752
| +420% | +$42.6K |
|
235
CALL
Palo Alto Networks
PANW
$273B
| $708K | 0.08% |
2,496
+150
| +6% | +$3.36K |
|
236
CALL
State Street SPDR NYSE Technology ETF
XNTK
$2.15B
| $702K | 0.08% |
6,498
+1,366
| +27% | +$69.1K |
|
|
ESPR
237
DELISTED
Esperion Therapeutics
ESPR
| $686K | 0.08% |
+7,410
| New | +$478K |
|
238
Starbucks
SBUX
$119B
| $681K | 0.08% |
+14,402
| New | +$647K |
|
239
PUT
BP
BP
$111B
| $680K | 0.08% |
+894
| New | +$29.3K |
|
240
CALL
United Airlines
UAL
$38.3B
| $676K | 0.08% |
1,261
-379
| -23% | -$25.7K |
|
241
NetApp
NTAP
$32.6B
| $667K | 0.08% |
+18,814
| New | +$719K |
|
242
PVH
PVH
$3.71B
| $664K | 0.08% |
6,240
+3,619
| +138% | +$392K |
|
243
PUT
Union Pacific
UNP
$174B
| $658K | 0.08% |
1,366
+776
| +132% | +$91.1K |
|
244
PUT
SLB Ltd
SLB
$71B
| $654K | 0.08% |
3,153
+1,753
| +125% | +$146K |
|
245
Brookdale Senior Living
BKD
$3.5B
| $653K | 0.08% |
17,307
+15,375
| +796% | +$563K |
|
246
CALL
Invesco QQQ Trust
QQQ
$471B
| $647K | 0.08% |
+1,649
| New | +$173K |
|
247
PUT
American Express
AXP
$237B
| $646K | 0.08% |
+1,503
| New | +$125K |
|
248
PUT
Mastercard
MA
$473B
| $643K | 0.07% |
786
-929
| -54% | -$80.6K |
|
|
YHOO
249
CALL
DELISTED
Yahoo Inc
YHOO
| $637K | 0.07% |
1,046
-3,456
| -77% | -$156K |
|
250
CALL
eBay
EBAY
$49.8B
| $634K | 0.07% |
4,139
+784
| +23% | +$18.7K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.