Hainam,
For reference, the Issue scoring criteria may be found here:
https://www.ets.org/gre/revised_general/prepare/analytical_writing/issue/scoring_guide
From these criteria, I would argue that your essay would receive a score of 3.0 or 3.5.
Distinguishing between a 3 and a 4, your essay does have a clear position, but it is "limited...in presenting or developing a position on the issue..." Your examples of Apple or Microsoft speak to their potential to help others based on their size, but using a corporate reference would be more effective if you had a specific example, or gave a specific hypothetical. For instance, something like, "While Starbucks is a multinational corporation worth billions, they have built their brand on providing benefits to stakeholders who would otherwise go without. The company offers health insurance and tuition reimbursement to almost every person they employ, and every individual store has a budget to help promote connections with local organizations. The CEO, at a shareholder meeting, proclaimed that they were committed to creating an inclusive atmosphere for LGBT employees, even if that meant some customers would choose not to patronize the business; he even told a shareholder to sell off his shares if they disagreed with that view! It may be possible that Starbucks is leaving money on the table by shifting its focus so far away from the business of running a cafe; it is also possible their executives have recognized that these non-business values actually increase profitability."
Then, there are "problems in language and sentence structure," and "occasional major errors," that pop up. In this "five paragraph essay," your final body paragraph is literally two sentences, one of which essentially restates your thesis in an alternative fashon.
A strategy that has been helpful for students that I've tutored is the following (abbreviated):
Shoot for a four-paragraph essay: Intro, two body paragraphs, conclusion. In your intro and body paragraphs, you will take a strong position while simultaneously acknowledging that there are limits to this view, and elaborating on this. Your body paragraphs will have two strong points in favor of your position. So for instance, in this essay, you can agree that corporations have a responsibility to all stakeholders for two reasons: 1. This responsibility actually ends up increasing shareholder value (see SBUX example). 2. Businesses are recipients of many public goods and infrastructure, such as well-maintained roads, utilities, public safety, and an educated populace from the local school system. They have an obligation to reciprocate by not only providing good jobs for the community, but to support the community itself via taxes and outreach. Both of these reasons are very "meaty," and can allow for disagreement.
Fully developed positions and insight are inherent qualities of top-scoring essays. It is very challenging to showcase these qualities if you "completely agree" with an argument. The most effective arguments are those which proactively raise concerns/disagreements, and then effectively respond to them.
I hope you found this helpful.
Stephen Byer