With the S&P/ASX 200 Index (Index: ^AXJO) (ASX: XJO) up just over 3.5% this week, one healthcare company, a steel producer, a mining company, a pizza retail giant, and an organic food and formula producer were among the stocks that enjoyed the largest gains this week.

Top 5 share price gains:

1. Primary Health Care Limited (ASX: PRY)

  • Weekly rise: 26.34% to $2.83
  • Share price movement past 12 months: Down 39.53%

Primary Health Care Limited provides medical and pathology centres for medical and health professionals.

The reason for the rise. This week, Primary Health Care announced a half year net profit attributable to members up 28% to $68 million compared to the pcp.

2. BlueScope Steel Limited (ASX: BSL)

  • Weekly rise: 23.29% to $5.40
  • Share price movement past 12 months: Down 3.23%

BlueScope is a steel producer.

The reason for the rise. BlueScope recently announced that its preliminary unaudited underlying earnings before interest and tax (EBIT) for the six months ended 31 December 2015 are expected to be around $230 million. Above the prior guidance of approximately $180 million.

3. Fortescue Metals Group Limited (ASX: FMG)

  • Weekly rise: 22.94% to $2.09
    Share price movement past 12 months: Down 16.06%

Fortescue produces iron ore.

The reason for the rise. Iron ore prices rose above US$46 per tonne this week, and the company recently reported its quarterly production report for the period December 2015. Fortescue shipped 42.1mt of iron ore at a record low cash production cost of US$15.80 per wet metric tonne (wmt) for the December 2015 quarter. Early repayment of US$750m of debt was completed during the quarter.

4. Domino’s Pizza Enterprises Ltd (ASX: DMP)

  • Weekly rise: 19.69% to $60.80
  • Share price movement past 12 months: Up 71.03%

Domino’s has more than 1,500 retail food outlets in six countries.

The reason for the rise. Domino’s recently reported underlying record NPAT of $45.6m, an increase of 56.7% on the pcp, driven by organic growth and defying the current global economic environment. With markets in Australia, NZ, Belgium, France, The Netherlands and Japan, the company reported strong group Same Store Sales (SSS) of 10.3% for HY16.

5. Bellamy’s Australia Ltd (ASX: BAL)

  • Weekly rise: 17.97% to $13.92
  • Share price movement past 12 months: Up 535.62%

Bellamy’s provides a range of organic food and formula products for babies and toddlers.

The reason for the rise. Bellamy’s recently provided a trading update stating unaudited management accounts for the six months to 31 December 2015 indicate revenue of $105 million and EBIT of $19 million. Subject to normal trading conditions across all markets, Bellamy’s expect revenues in 2H16 to be stronger than 1H16. Bellamy’s have contracted for additional formula volume.

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Motley Fool contributor John Hopkins 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. The Motley Fool Australia owns shares of Bellamy's Australia. 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.