NEW YORK (TheStreet) -- General Motors (GM) - Get Report stock is increasing 0.37% to $28.27 in afternoon trading on Thursday even though the company's U.S. market share faces risks because of rising truck sales.

The Detroit-based company has struggled to meet the demand for pickup trucks and SUVs and is selling less fleet vehicles as part of a plan to reduce low-margin products, the Wall Street Journal reports.

GM's market share of 16.7% is at the lowest level in more than three decades, while Ford Motor (F) has increased its market share to 15.3% in the U.S.

Analysts are expecting Ford's market share to grow more in June as the company remains successful in the truck market with profitable, popular trucks like the F-150, the Journal added.

Both companies are expected to report monthly auto sales for June tomorrow morning.

Shares of Ford are down 0.24% to $12.52 this afternoon.

Separately, GM has a "buy" rating and a letter grade of B- at TheStreet Ratings because of the company's compelling growth in net income, revenue growth, notable return on equity, attractive valuation levels and impressive record of earnings per share growth.

You can view the full analysis from the report here: GM

TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this article's author.

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