Activist investors are shareholders that purchase large numbers of a public company's shares in an effort to effect a significant change within the company, often by trying to obtain seats on the company's board...

(Bloomberg) -- Activist investor Sachem Head Capital Management has made its biggest bet yet, taking a $1.2 billion stake in Elanco Animal Health Inc. to push for changes at the company. The New York-based investment firm, which owns a 9.1% stake in Elanco in stock and options, believes the company is undervalued and underperforming its competitors, including its larger rival Zoetis Inc., according to people familiar with the matter...

Olin Corp. (NYSE:OLN) confirms activist investor Sachem Head Capital Management plans tonominate four directorsat the company's 2020 annual shareholders meeting...