Although the local share market is actually sitting in the red for the session so far, there are a number of big-name companies whose shares have made considerable gains today – all due to positive earnings reports. Here are four of those companies…

a2 Milk Company Ltd (Australia) (ASX: A2M) shares have risen 6.9%, although they did rise as much as 22.7% earlier. The dairy company, which also produces a popular infant formula product, reported its half-year results this morning, including a huge lift in revenues and earnings. Better yet, it increased its earnings guidance for the full-year as well.

Domino’s Pizza Enterprises Ltd. (ASX: DMP) shares have risen 10% to $57.57 after hitting a high of $61.99 earlier, a rise of 18.4%. Although the company reported a slight decrease in same-store-sales in Japan, the results were otherwise very impressive including same-store-sales growth of 13.8% in Australia and New Zealand. This was largely driven by one of its marketing campaigns, together with its focus on technology.

Primary Health Care Limited (ASX: PRY) produced a mixed set of earnings results, although investors certainly seemed to appreciate them. Although the healthcare group cut its dividend, its shares still soared 20% to $2.64 after it reported a 28.5% lift in net profit after tax (NPAT) and said it was expecting a stronger second half of the year.

Reject Shop Ltd (ASX: TRS) shares also gained a quarter of their value today, lifting 25% to $12.62. They hit a high of $12.73 earlier which was their highest price since early 2014. The discount variety retailer reported a 5.6% lift in sales (comparable sales were up 4.4%) for the 26 weeks ended 27 December 2015, while NPAT rose 43% despite a sharp fall in the Australian dollar.

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Motley Fool contributor Ryan Newman has no position in any stocks mentioned. Unless otherwise noted, the author does not have a position in any stocks mentioned by the author in the comments below. You can follow Ryan on Twitter @ASXvalueinvest.

The Motley Fool Australia has no position in any of the stocks mentioned. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.