Open offer made by companies to take over What is open offer in simple terms? What is its meaning in cases of taking over the major stakes in other company?
An "Open Offer" is not necessarily the same as a "corporate takeover."  

An "open offer" (as defined by the link above) is 


  the opportunity to purchase stock at a price that is lower than the current market price 


An "open offer" is primarily used to raise funds for the company.  

However, it is also important to note that, in an "open offer," 


  a company allows existing shareholders to purchase additional shares directly from the company in proportion to what they currently own. This is to prevent dilution to existing shareholders 


Since the existing shareholders own the same proportion of stocks both before and and after the "open offer," the leadership of the company does not necessarily change.