Why these 4 ASX shares are posting strong gains today

The Sirtex Medical Limited (ASX:SRX) share price is one of four posting strong gains today. Here's what you need to know…

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The S&P/ASX 200 (Index: ^AXJO) (ASX: XJO) has followed the lead of international markets and climbed higher today. In early afternoon trade the index is up 0.8% to 5,801 points.

Four shares which have climbed more than most today are listed below. Here's why:

The Big Un Ltd (ASX: BIG) share price has jumped over 11% to $1.07 after the video technology company increased its fourth quarter cash revenue guidance. Thanks to strong demand for its services this month, management has increased its guidance to over $9 million. This represents a 58% quarter-on-quarter increase and a 10% increase on its previous guidance. Big Un's shares have now gained in excess of 350% year-to-date.

The Fortescue Metals Group Limited (ASX: FMG) share price is up 4% to $5.28. This latest gain means the iron ore producer's shares have climbed over 12% in the last five trading sessions. A rebound in iron ore prices has been the catalyst for the gain. Overnight the benchmark 62% fines increased a further 4.4% to US$62.33 a tonne, according to Metal Bulletin.

The Sigma Healthcare Ltd (ASX: SIG) share price has climbed 4% to 91.5 cents after it announced that it has agreed to an amendment to its Community Service Obligation Deed that will result in an additional $5.2 million of funding. Whilst this is positive news, I would suggest investors stay clear of the company due to its dispute with major customer My Chemist/Chemist Warehouse Group.

The Sirtex Medical Limited (ASX: SRX) share price has continued to build on yesterday's gain and is up a further 5% to $16.57. Two brokers appear to be pleased with the medical device company's recent update. UBS and Morgan Stanley released research notes this morning with buy and overweight ratings on its shares. Further, the two brokers see significant upside potential with $27.45 and $17.90 price targets, respectively, for its shares.

Motley Fool contributor James Mickleboro has no position in any stocks mentioned. 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.

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