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 | |
|---|---|---|---|---|---|---|
2026
PUT
Check Point Software Technologies
CHKP
$13.3B
| $28K | ﹤0.01% |
+69
| New | +$5.57K |
|
2027
PUT
Charter Communications
CHTR
$14.7B
| $28K | ﹤0.01% |
+86
| New | +$14.9K |
|
2028
PUT
Comstock Resources
CRK
$3.97B
| $28K | ﹤0.01% |
22
+15
| +214% | +$371 |
|
2029
Enanta Pharmaceuticals
ENTA
$372M
| $28K | ﹤0.01% |
943
-736
| -44% | -$28.6K |
|
2030
CALL
Freshpet
FRPT
$2.83B
| $28K | ﹤0.01% |
+88
| New | +$1.48K |
|
|
HIMX
2031
PUT
Himax Technologies
HIMX
$2.2B
| $28K | ﹤0.01% |
120
+74
| +161% | +$565 |
|
2032
Heron Therapeutics
HRTX
$86.3M
| $28K | ﹤0.01% |
+1,964
| New | +$22.1K |
|
2033
Ironwood Pharmaceuticals
IRWD
$611M
| $28K | ﹤0.01% |
+2,147
| New | +$28.2K |
|
2034
Korea Electric Power
KEP
$15.5B
| $28K | ﹤0.01% |
1,400
+737
| +111% | +$14.6K |
|
2035
CALL
Liberty Global Class C
LBTYK
$3.27B
| $28K | ﹤0.01% |
+340
| New | +$13.5K |
|
2036
PUT
Lincoln National
LNC
$7.91B
| $28K | ﹤0.01% |
88
+6
| +7% | +$335 |
|
|
LNW
2037
DELISTED
Light & Wonder
LNW
| $28K | ﹤0.01% |
2,689
-10,975
| -80% | -$138K |
|
2038
PUT
McKesson
MCK
$98.5B
| $28K | ﹤0.01% |
91
-166
| -65% | -$36.8K |
|
2039
VanEck Agribusiness ETF
MOO
$989M
| $28K | ﹤0.01% |
+533
| New | +$28.8K |
|
2040
CALL
Meritage Homes
MTH
$4.87B
| $28K | ﹤0.01% |
156
+140
| +875% | +$2.83K |
|
2041
PUT
Neurocrine Biosciences
NBIX
$17.7B
| $28K | ﹤0.01% |
95
-96
| -50% | -$3.43K |
|
2042
PUT
NetApp
NTAP
$32.9B
| $28K | ﹤0.01% |
323
+298
| +1,192% | +$11.4K |
|
2043
Omega Healthcare
OHI
$15.4B
| $28K | ﹤0.01% |
707
+624
| +752% | +$25.8K |
|
2044
ONE Gas
OGS
$5.05B
| $28K | ﹤0.01% |
660
+223
| +51% | +$9.53K |
|
2045
CALL
Oneok
OKE
$58.7B
| $28K | ﹤0.01% |
123
+80
| +186% | +$3.65K |
|
2046
PUT
Oracle
ORCL
$331B
| $28K | ﹤0.01% |
372
+186
| +100% | +$8.06K |
|
2047
Portland General Electric
POR
$6.02B
| $28K | ﹤0.01% |
777
+107
| +16% | +$4.04K |
|
|
PPL
2048
CALL
PPL Corp
PPL
$27.3B
| $28K | ﹤0.01% |
279
+222
| +389% | +$7.13K |
|
2049
Ryman Hospitality Properties
RHP
$8.4B
| $28K | ﹤0.01% |
+475
| New | +$27.6K |
|
2050
CALL
J.M. Smucker
SJM
$12.6B
| $28K | ﹤0.01% |
+21
| New | +$2.3K |
|
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.