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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
126
HDFC Bank
HDB
$122B
| $3.23M | 0.14% |
127,284
+59,260
| +87% | +$1.42M |
|
127
Kraft Heinz
KHC
$30.6B
| $3.22M | 0.14% |
41,453
+25,739
| +164% | +$2.02M |
|
|
128
PUT
Meta Platforms (Facebook)
META
$1.63T
| $3.21M | 0.14% |
10,174
-3,755
| -27% | -$664K |
|
129
ProShares Ultra S&P500
SSO
$8.04B
| $3.17M | 0.14% |
+232,144
| New | +$3M |
|
130
General Motors
GM
$71.7B
| $3.12M | 0.13% |
76,038
-14,794
| -16% | -$642K |
|
131
Carnival Corporation Ltd
CCL
$35.8B
| $3.07M | 0.13% |
46,248
+30,819
| +200% | +$2.04M |
|
132
Yelp
YELP
$1.45B
| $3.03M | 0.13% |
72,312
-5,078
| -7% | -$226K |
|
133
Vulcan Materials
VMC
$36.4B
| $2.98M | 0.13% |
23,242
+22,194
| +2,118% | +$2.71M |
|
134
Lam Research
LRCX
$403B
| $2.97M | 0.13% |
+161,270
| New | +$3.17M |
|
|
135
CALL
Baidu
BIDU
$36.8B
| $2.95M | 0.13% |
5,436
+2,099
| +63% | +$513K |
|
136
Intuitive Surgical
ISRG
$124B
| $2.91M | 0.13% |
23,919
+10,455
| +78% | +$1.31M |
|
|
CLVS
137
DELISTED
Clovis Oncology, Inc.
CLVS
| $2.91M | 0.13% |
42,752
+15,349
| +56% | +$1.07M |
|
|
TWTR
138
CALL
DELISTED
Twitter, Inc.
TWTR
| $2.88M | 0.12% |
9,797
+4,974
| +103% | +$102K |
|
139
LendingTree
TREE
$616M
| $2.88M | 0.12% |
8,471
+4,994
| +144% | +$1.42M |
|
140
PUT
IBM
IBM
$198B
| $2.86M | 0.12% |
6,693
+706
| +12% | +$103K |
|
141
Autodesk
ADSK
$46B
| $2.84M | 0.12% |
27,112
-12,147
| -31% | -$1.42M |
|
|
MOMO
142
Hello Group
MOMO
$886M
| $2.82M | 0.12% |
115,362
-31,333
| -21% | -$903K |
|
143
Illumina
ILMN
$27.9B
| $2.79M | 0.12% |
13,140
-794
| -6% | -$163K |
|
144
CALL
Union Pacific
UNP
$176B
| $2.79M | 0.12% |
4,255
+192
| +5% | +$23.2K |
|
|
OA
145
DELISTED
Orbital ATK, Inc.
OA
| $2.7M | 0.12% |
20,532
+17,032
| +487% | +$2.26M |
|
|
PARA
146
DELISTED
Paramount Global Class B
PARA
| $2.68M | 0.12% |
45,467
+9,193
| +25% | +$529K |
|
147
Arista Networks
ANET
$220B
| $2.68M | 0.12% |
+181,984
| New | +$2.43M |
|
|
BNY
148
Bank of New York Mellon
BNY
$108B
| $2.63M | 0.11% |
48,834
+40,573
| +491% | +$2.16M |
|
|
TWX
149
PUT
DELISTED
Time Warner Inc
TWX
| $2.63M | 0.11% |
9,100
+2,716
| +43% | +$257K |
|
150
American Express
AXP
$240B
| $2.62M | 0.11% |
+26,403
| New | +$2.51M |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.