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 | |
|---|---|---|---|---|---|---|
|
ABK
1976
CALL
DELISTED
Ambac Financial Group
ABK
| $82K | ﹤0.01% |
992
+928
| +1,450% | +$76.7K |
|
1977
PUT
American Superconductor
AMSC
$1.48B
| $81K | ﹤0.01% |
1,292
+1,281
| +11,645% | +$4.89K |
|
1978
PUT
Bunge Global
BG
$23.6B
| $81K | ﹤0.01% |
273
-765
| -74% | -$52K |
|
1979
CALL
Equinix
EQIX
$107B
| $81K | ﹤0.01% |
36
+7
| +24% | +$3.24K |
|
1980
PUT
Itaú Unibanco
ITUB
$91.3B
| $81K | ﹤0.01% |
2,154
+1,049
| +95% | +$6.7K |
|
1981
Omnicom Group
OMC
$22.7B
| $81K | ﹤0.01% |
+1,120
| New | +$80.3K |
|
1982
Pegasystems
PEGA
$4.41B
| $81K | ﹤0.01% |
3,452
-2,992
| -46% | -$80.3K |
|
|
PR
1983
Permian Resources
PR
$17.9B
| $81K | ﹤0.01% |
+4,134
| New | +$80.3K |
|
1984
CALL
uniQure
QURE
$2.68B
| $81K | ﹤0.01% |
136
+36
| +36% | +$548 |
|
|
SCWX
1985
DELISTED
SecureWorks Corp Class A Common Stock
SCWX
| $81K | ﹤0.01% |
+9,172
| New | +$93.7K |
|
|
EGIO
1986
DELISTED
Edgio, Inc. Common Stock
EGIO
| $81K | ﹤0.01% |
463
+144
| +45% | +$28.4K |
|
|
HDS
1987
CALL
DELISTED
HD Supply Holdings, Inc.
HDS
| $81K | ﹤0.01% |
153
-365
| -70% | -$13.4K |
|
|
HIVE
1988
DELISTED
Aerohive Networks
HIVE
| $81K | ﹤0.01% |
+13,953
| New | +$67.2K |
|
|
DCT
1989
DELISTED
DCT Industrial Trust Inc.
DCT
| $81K | ﹤0.01% |
+1,384
| New | +$81.9K |
|
1990
CALL
BlackBerry
BB
$5.01B
| $80K | ﹤0.01% |
1,915
-418
| -18% | -$4.56K |
|
1991
CALL
Boston Scientific
BSX
$65.8B
| $80K | ﹤0.01% |
541
-18
| -3% | -$496 |
|
1992
CALL
GE Aerospace
GE
$367B
| $80K | ﹤0.01% |
980
+506
| +107% | +$48.3K |
|
|
GIFI
1993
DELISTED
Gulf Island Fabrication
GIFI
| $80K | ﹤0.01% |
+5,976
| New | +$75.6K |
|
1994
iShares S&P GSCI Commodity-Indexed Trust
GSG
$1.02B
| $80K | ﹤0.01% |
+4,916
| New | +$76.1K |
|
1995
PUT
InterDigital
IDCC
$6.68B
| $80K | ﹤0.01% |
169
+36
| +27% | +$2.69K |
|
1996
CALL
Labcorp
LH
$24.3B
| $80K | ﹤0.01% |
68
-142
| -68% | -$18.8K |
|
1997
MiMedx Group
MDXG
$626M
| $80K | ﹤0.01% |
+6,421
| New | +$78.3K |
|
1998
CALL
Public Storage
PSA
$60.2B
| $80K | ﹤0.01% |
749
+671
| +860% | +$142K |
|
1999
Sally Beauty Holdings
SBH
$1.4B
| $80K | ﹤0.01% |
4,293
+4,045
| +1,631% | +$70.1K |
|
2000
CALL
Corpay
CPAY
$24.2B
| $80K | ﹤0.01% |
66
-77
| -54% | -$13.5K |
|
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.