For the stock market, Mercury should be Valban. We see Mercury in astrology for stock market, business, management, advocacy, etc. People who have strong Mercury, they make a plan in the beginning whether they are doing work or going somewhere and they are good at management. Therefore, people who can manage properly, when to buy and when to sell are important things in the stock market, so people with good Mercury will achieve success. To make Mercury planet good, eat plain food on Wednesday and worship Lord Lakshminarayan of Mercury. 

There is also a decline in stock trading when the planet Mercury sets.

good luck
Aries – Tuesday, Thursday, Monday
Taurus – Friday, Wednesday, Saturday
Gemini – Wednesday, Friday, Saturday
Cancer – Monday, Thursday, Sunday
Leo – Sunday, Thursday, Monday
Virgo – Wednesday, Friday, Saturday
Libra – Friday, Wednesday, Saturday
Scorpio – Tuesday, Thursday, Monday
Sagittarius – Thursday, Sunday, Tuesday
Capricorn – Saturday, Friday, Wednesday
Aquarius – Saturday, Friday, Wednesday
Pisces – Thursday, Sunday, Tuesday