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 | |
|---|---|---|---|---|---|---|
|
GGP
2976
CALL
DELISTED
GGP Inc.
GGP
| $29K | ﹤0.01% |
1,094
+1,037
| +1,819% | +$23.1K |
|
|
REN
2977
PUT
DELISTED
Resolute Energy Corporaton
REN
| $29K | ﹤0.01% |
298
-19
| -6% | -$552 |
|
2978
Argan
AGX
$7.98B
| $28K | ﹤0.01% |
+633
| New | +$37.7K |
|
2979
Airgain
AIRG
$74.3M
| $28K | ﹤0.01% |
3,212
+1,485
| +86% | +$13.5K |
|
2980
PUT
Alarm.com
ALRM
$2.56B
| $28K | ﹤0.01% |
+108
| New | +$4.66K |
|
2981
CALL
Avery Dennison
AVY
$12.3B
| $28K | ﹤0.01% |
23
+11
| +92% | +$1.19K |
|
2982
CALL
Banc of California
BANC
$3.28B
| $28K | ﹤0.01% |
217
-81
| -27% | -$1.69K |
|
2983
PUT
Caesarstone
CSTE
$72.3M
| $28K | ﹤0.01% |
131
+37
| +39% | +$950 |
|
2984
Emergent Biosolutions
EBS
$375M
| $28K | ﹤0.01% |
+622
| New | +$26.2K |
|
2985
Euronet Worldwide
EEFT
$3.02B
| $28K | ﹤0.01% |
338
-4,353
| -93% | -$403K |
|
2986
Green Plains
GPRE
$1.19B
| $28K | ﹤0.01% |
+1,717
| New | +$30.2K |
|
2987
PUT
GSK
GSK
$103B
| $28K | ﹤0.01% |
154
-41
| -21% | -$1.89K |
|
2988
PUT
Infosys
INFY
$45B
| $28K | ﹤0.01% |
3,376
-1,826
| -35% | -$13.9K |
|
2989
CALL
Itaú Unibanco
ITUB
$91.3B
| $28K | ﹤0.01% |
1,301
-97
| -7% | -$619 |
|
2990
PUT
Knight Transportation
KNX
$11.8B
| $28K | ﹤0.01% |
304
+51
| +20% | +$2.1K |
|
2991
CALL
Lincoln Electric
LECO
$13.8B
| $28K | ﹤0.01% |
61
+50
| +455% | +$4.57K |
|
2992
CALL
LivaNova
LIVN
$4.3B
| $28K | ﹤0.01% |
86
+77
| +856% | +$6.11K |
|
|
MRC
2993
DELISTED
MRC Global
MRC
| $28K | ﹤0.01% |
+1,685
| New | +$27.8K |
|
2994
CALL
Motorola Solutions
MSI
$69.4B
| $28K | ﹤0.01% |
88
-618
| -88% | -$56.3K |
|
2995
CALL
Okta
OKTA
$24.1B
| $28K | ﹤0.01% |
49
-64
| -57% | -$1.79K |
|
2996
CALL
Paylocity
PCTY
$6.71B
| $28K | ﹤0.01% |
238
+230
| +2,875% | +$11.2K |
|
2997
CALL
Public Service Enterprise Group
PEG
$39.8B
| $28K | ﹤0.01% |
145
+2
| +1% | +$101 |
|
2998
CALL
Polaris
PII
$4.15B
| $28K | ﹤0.01% |
36
-127
| -78% | -$15.1K |
|
2999
PUT
PVH
PVH
$3.71B
| $28K | ﹤0.01% |
350
+110
| +46% | +$14.4K |
|
3000
PUT
Ferrari
RACE
$63.3B
| $28K | ﹤0.01% |
313
-123
| -28% | -$13.7K |
|
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.