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 |
Apple
AAPL
|
+$34.8M |
| 2 |
Bausch Health
BHC
|
+$20.3M |
| 3 |
Chipotle Mexican Grill
CMG
|
+$18.9M |
| 4 |
GMCR
KEURIG GREEN MTN INC
GMCR
|
+$12.3M |
| 5 |
Amazon
AMZN
|
+$12.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$27.5M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.8M |
| 3 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$12.1M |
| 4 |
Netflix
NFLX
|
+$10.7M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$10.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 51.63% |
| 2 | Consumer Discretionary | 9.7% |
| 3 | Healthcare | 7.81% |
| 4 | Technology | 7.23% |
| 5 | Communication Services | 6.86% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
76
PUT
GoPro
GPRO
$351M
| $2.8M | 0.22% |
5,003
-1,382
| -22% | -$32.1K |
|
77
PUT
Alphabet (Google) Class A
GOOGL
$4.14T
| $2.8M | 0.22% |
+104,920
| New | +$3.88M |
|
78
PUT
Biogen
BIIB
$32.6B
| $2.72M | 0.21% |
1,349
-1,159
| -46% | -$333K |
|
79
PUT
Qualcomm
QCOM
$180B
| $2.71M | 0.21% |
3,639
+1,067
| +41% | +$56.9K |
|
80
ProShares UltraShort S&P500
SDS
$385M
| $2.69M | 0.21% |
1,352
+1,205
| +820% | +$2.42M |
|
81
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
$4.06B
| $2.68M | 0.21% |
+22,152
| New | +$3.15M |
|
|
RSX
82
DELISTED
VanEck Russia ETF
RSX
| $2.67M | 0.21% |
182,541
+139,105
| +320% | +$2.27M |
|
83
Bank of America
BAC
$438B
| $2.62M | 0.21% |
155,884
+115,864
| +290% | +$1.96M |
|
84
PUT
Walt Disney
DIS
$182B
| $2.62M | 0.2% |
11,336
+4,418
| +64% | +$492K |
|
|
85
CALL
Biogen
BIIB
$32.6B
| $2.6M | 0.2% |
2,457
+322
| +15% | +$92.5K |
|
86
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.68B
| $2.59M | 0.2% |
26,468
-20,410
| -44% | -$453K |
|
87
CALL
Baidu
BIDU
$33.7B
| $2.57M | 0.2% |
3,134
-2,112
| -40% | -$389K |
|
88
General Motors
GM
$77B
| $2.5M | 0.2% |
73,627
+30,454
| +71% | +$1.06M |
|
89
PUT
Meta Platforms (Facebook)
META
$1.57T
| $2.5M | 0.2% |
6,683
-4,498
| -40% | -$462K |
|
90
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$6B
| $2.5M | 0.2% |
41,800
+2,370
| +6% | +$8.78K |
|
|
CBI
91
PUT
DELISTED
Chicago Bridge & Iron Nv
CBI
| $2.48M | 0.19% |
1,203
+263
| +28% | +$10.9K |
|
|
92
PUT
Amazon
AMZN
$2.79T
| $2.48M | 0.19% |
113,080
-37,240
| -25% | -$1.17M |
|
93
HCA Healthcare
HCA
$87.7B
| $2.47M | 0.19% |
36,503
-23,789
| -39% | -$1.66M |
|
94
Caterpillar
CAT
$374B
| $2.37M | 0.19% |
+34,818
| New | +$2.43M |
|
|
SCTY
95
CALL
DELISTED
SolarCity Corporation
SCTY
| $2.33M | 0.18% |
3,100
+1,242
| +67% | +$48.2K |
|
96
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.01B
| $2.32M | 0.18% |
6,087
-3,909
| -39% | -$212K |
|
97
Thermo Fisher Scientific
TMO
$227B
| $2.3M | 0.18% |
16,231
+15,122
| +1,364% | +$2.02M |
|
|
VNET
98
VNET Group
VNET
$1.81B
| $2.29M | 0.18% |
108,146
+68,097
| +170% | +$1.36M |
|
|
SINA
99
DELISTED
Sina Corp
SINA
| $2.25M | 0.18% |
45,485
+31,184
| +218% | +$1.5M |
|
|
EA
100
DELISTED
Electronic Arts
EA
| $2.17M | 0.17% |
31,558
-13,277
| -30% | -$931K |
|
Similar funds
Simplex Trading's Q4 2015 Portfolio in Review
As of Q4 2015, Simplex Trading held 7,008 positions worth $1.28B, down 6.4% from $1.36B the previous quarter. Its ten largest holdings account for 19% of the portfolio.
Simplex Trading deployed $39.7M of net new capital in Q4 2015, opening 1,415 new positions and adding to 1,993 existing holdings. Its largest new stake was Chipotle Mexican Grill: 1,548,150 shares worth $14.9M.
By sector, the portfolio is most concentrated in Miscellaneous at 52% of assets, down from 65% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $13.8M trimmed.
- Simplex Trading's largest Q4 2015 buy was Chipotle Mexican Grill: 1,548,150 shares worth $14.9M.
- Simplex Trading added most to Apple in Q4 2015, an estimated $34.8M increase.
- Simplex Trading's biggest Q4 2015 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $13.8M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2015, selling an estimated $27.5M.
- Simplex Trading's ten largest holdings make up 19% of its $1.28B portfolio in Q4 2015.
- Simplex Trading opened 1,415 new positions and closed 1,598 in Q4 2015.
- Simplex Trading's portfolio value fell 6.4% quarter-over-quarter to $1.28B.
Based on Simplex Trading's 13F filing for Q4 2015, filed 20 Jan 2016.