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 | |
|---|---|---|---|---|---|---|
4851
PUT
Baytex Energy
BTE
$2.86B
| $3K | ﹤0.01% |
12
-17
| -59% | -$50 |
|
4852
PUT
Peabody Energy
BTU
$2.83B
| $3K | ﹤0.01% |
52
-244
| -82% | -$7.92K |
|
4853
PUT
CACI
CACI
$11.3B
| $3K | ﹤0.01% |
+20
| New | +$2.7K |
|
4854
PUT
Conagra Brands
CAG
$7.38B
| $3K | ﹤0.01% |
78
-18
| -19% | -$639 |
|
4855
CALL
Coeur Mining
CDE
$15.4B
| $3K | ﹤0.01% |
237
-173
| -42% | -$1.36K |
|
4856
PUT
Celanese
CE
$4.77B
| $3K | ﹤0.01% |
+11
| New | +$1.17K |
|
|
CLDT
4857
CALL
Chatham Lodging
CLDT
$638M
| $3K | ﹤0.01% |
49
-14
| -22% | -$314 |
|
4858
CALL
Clean Harbors
CLH
$16B
| $3K | ﹤0.01% |
29
-24
| -45% | -$1.3K |
|
|
CMCM
4859
PUT
Cheetah Mobile
CMCM
$90.6M
| $3K | ﹤0.01% |
32
+27
| +540% | +$1.38K |
|
4860
CALL
CONMED
CNMD
$1.33B
| $3K | ﹤0.01% |
76
-26
| -25% | -$1.35K |
|
4861
PUT
Carter's
CRI
$1.45B
| $3K | ﹤0.01% |
21
-132
| -86% | -$13.7K |
|
4862
PUT
Comstock Resources
CRK
$3.64B
| $3K | ﹤0.01% |
204
+39
| +24% | +$232 |
|
4863
PUT
Cintas
CTAS
$86B
| $3K | ﹤0.01% |
+536
| New | +$20.4K |
|
4864
Culp Inc
CULP
$45.1M
| $3K | ﹤0.01% |
+101
| New | +$3.18K |
|
4865
PUT
Dominion Energy
D
$62.1B
| $3K | ﹤0.01% |
61
-362
| -86% | -$29.3K |
|
4866
PUT
Diageo
DEO
$49.4B
| $3K | ﹤0.01% |
66
-10
| -13% | -$1.38K |
|
4867
PUT
HF Sinclair
DINO
$16.1B
| $3K | ﹤0.01% |
427
-133
| -24% | -$5.62K |
|
4868
PUT
Diodes
DIOD
$3.69B
| $3K | ﹤0.01% |
+5
| New | +$155 |
|
4869
CALL
Delek Logistics
DKL
$3.07B
| $3K | ﹤0.01% |
14
| – | – |
|
4870
PUT
Ecopetrol
EC
$32.5B
| $3K | ﹤0.01% |
+5
| New | +$57 |
|
4871
PUT
e.l.f. Beauty
ELF
$4.96B
| $3K | ﹤0.01% |
60
+20
| +50% | +$427 |
|
4872
PUT
Edgewell Personal Care
EPC
$1.3B
| $3K | ﹤0.01% |
164
+142
| +645% | +$8.93K |
|
4873
CALL
Energy Recovery
ERII
$433M
| $3K | ﹤0.01% |
27
-25
| -48% | -$228 |
|
4874
CALL
Entergy
ETR
$52.4B
| $3K | ﹤0.01% |
58
-188
| -76% | -$7.88K |
|
4875
PUT
Evolent Health
EVH
$421M
| $3K | ﹤0.01% |
23
-598
| -96% | -$8.43K |
|
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.