The first two are different because "the company's shares rose by 10 % last year" suggests something which has finished, that their shares rose and now they are no longer rising. The second, however, is saying that the companies shares began rising in the past and could keep rising in the future. The important part here being 'rose' vs 'have risen' making the distinction. As for 'last year' vs 'in the last year', 'last year' suggests the year before the current one. "The economy grew 4% last year" would be talking about 2017, from Jan 1st until Dec 31st. 'In the last year', however suggests a year ago from today, so from Feb 2 2017 until Feb 2 2018, the economy has grown 4%. It's a very small distinction but it can change the interpretation for some people.