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 | |
|---|---|---|---|---|---|---|
4676
CALL
Gold Fields
GFI
$28.8B
| $4K | ﹤0.01% |
72
-27
| -27% | -$109 |
|
4677
CALL
Global Net Lease
GNL
$1.87B
| $4K | ﹤0.01% |
243
-36
| -13% | -$775 |
|
4678
PUT
Generac Holdings
GNRC
$11.5B
| $4K | ﹤0.01% |
43
-105
| -71% | -$5.22K |
|
4679
CALL
Gogo Inc
GOGO
$525M
| $4K | ﹤0.01% |
99
+21
| +27% | +$223 |
|
4680
PUT
Halozyme
HALO
$9.88B
| $4K | ﹤0.01% |
91
-54
| -37% | -$993 |
|
4681
PUT
HEICO Corp Class A
HEI.A
$36B
| $4K | ﹤0.01% |
216
+136
| +170% | +$6.65K |
|
4682
PUT
Helen of Troy
HELE
$656M
| $4K | ﹤0.01% |
+46
| New | +$4.24K |
|
4683
CALL
Hartford Financial Services
HIG
$39.9B
| $4K | ﹤0.01% |
22
+9
| +69% | +$502 |
|
4684
PUT
Huntington Ingalls Industries
HII
$11B
| $4K | ﹤0.01% |
14
+3
| +27% | +$708 |
|
4685
PUT
Harmony Gold Mining
HMY
$9.7B
| $4K | ﹤0.01% |
154
+81
| +111% | +$145 |
|
4686
PUT
HubSpot
HUBS
$12.9B
| $4K | ﹤0.01% |
38
+6
| +19% | +$503 |
|
4687
CALL
InterContinental Hotels
IHG
$23.8B
| $4K | ﹤0.01% |
+31
| New | +$1.87K |
|
4688
PUT
Ingles Markets
IMKTA
$1.72B
| $4K | ﹤0.01% |
247
+231
| +1,444% | +$6.29K |
|
4689
Innodata
INOD
$1.81B
| $4K | ﹤0.01% |
+2,999
| New | +$3.59K |
|
4690
PUT
Iron Mountain
IRM
$35.9B
| $4K | ﹤0.01% |
88
+68
| +340% | +$2.7K |
|
4691
PUT
Invesco
IVZ
$12.4B
| $4K | ﹤0.01% |
86
-35
| -29% | -$1.27K |
|
4692
PUT
Jacobs Solutions
J
$16B
| $4K | ﹤0.01% |
36
-183
| -84% | -$9.39K |
|
|
JKS
4693
CALL
JinkoSolar
JKS
$764M
| $4K | ﹤0.01% |
45
-312
| -87% | -$7.85K |
|
4694
CALL
Keysight
KEYS
$50.7B
| $4K | ﹤0.01% |
44
-5
| -10% | -$216 |
|
4695
PUT
Coca-Cola Femsa
KOF
$22.5B
| $4K | ﹤0.01% |
+18
| New | +$1.26K |
|
4696
Kopin
KOPN
$586M
| $4K | ﹤0.01% |
1,415
-9,260
| -87% | -$31.9K |
|
4697
Kilroy Realty
KRC
$4.59B
| $4K | ﹤0.01% |
62
-154
| -71% | -$11.3K |
|
4698
Littelfuse
LFUS
$10.4B
| $4K | ﹤0.01% |
22
+13
| +144% | +$2.61K |
|
4699
PUT
Live Nation Entertainment
LYV
$42.9B
| $4K | ﹤0.01% |
23
-198
| -90% | -$8.62K |
|
|
LITS
4700
Lite Strategy Inc
LITS
$32.4M
| $4K | ﹤0.01% |
105
-120
| -53% | -$5.64K |
|
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.