Shareholders in liver cancer treatment specialist Sirtex Medical Limited (ASX: SRX) may be feeling nervous this morning after the company revealed its own chief executive Gilman Wong had sold around $2 million worth of shares in the company.

However, Mr Wong still holds around $7.4 million worth of shares in the company plus substantial performance rights so there’s no doubt his interests remain aligned with shareholders. Directors may choose to sell shares for many reasons as like everyone else they will want to diversify their wealth, or raise large sums for one off purchases.

However, CEO selling can be an ominous sign as evidenced this week after Vita Group Limited (ASX: VTG) shares plunged 20% after the company revealed it may face changes to its “remuneration construct” with key business partner Telstra Corporation Ltd (ASX: TLS). Lucky timing then that Vita chief executive Maxine Horne decided to dump 10 million shares just over a month ago completely unaware that its key business partner could soon seek a new deal.

Is Sirtex good value?

Sirtex shares have been on the slide since August after its chief executive declined to provide guidance for financial year 2017’s dose sales guidance other than to expect it to be in the double-digit range. Last year the company was forced to downgrade specific guidance and unsurprisingly management don’t want to set themselves up for a fall again.

However, markets hate uncertainty and it usually translates into a sliding share price, although I am confident FY17’s dose sales growth will come in marginally under last year’s growth of 16.4 percent at around 14 percent.

In FY16 Sirtex sold 11,931 doses of its treatment, so a 14 percent lift in FY17 would take it to 13,600 dose sales. This looks a sound estimate and if management were expecting to beat last year’s 16.4 percent growth or vary widely from it they would have provided more specific guidance in my opinion.

These forecasts are also in line with analysts’ expectations at Macquarie Group Ltd (ASX: MQG) and improving profit margins should see the healthcare operator post earnings per share in the region of $1.10 to $1.20 in FY17.

If we take $1.15 per share in EPS as a mid-point for FY17 the group is trading on around 23x FY17’s expected earnings, which means it is not cheap, but reasonable value assuming you believe it can keep growing at double-digit rates out to FY19 and potentially beyond.

Three potential curveballs (or googlies in Australia) include the direction of the US dollar, potential US healthcare changes post its Federal election, and the results of multiple upcoming clinical trials in 2017.

Clearly investors may be in for a bumpy ride over the short term, although I expect this business still offers good long-term value, albeit higher up the risk curve.

These Low Interest Rates Could Totally Devastate Your Retirement!

With global interest rates set to remain at these "emergency low" levels for years -- perhaps even decades -- unless you take decisive action NOW, your retirement could be seriously at risk. Click here to learn how to NOT run out of money in retirement.

HOT OFF THE PRESSES: Motley Fool’s #1 Dividend Pick for 2017!

With its shares up 155% in just the last five years, this ‘under the radar’ consumer favourite is both a hot growth stock AND our expert’s #1 dividend pick for 2017. Now we’re pulling back the curtain for you... And all you have to do to discover the name, code and a full analysis is enter your email below!

Simply enter your email now to receive your copy of our brand-new FREE report, “The Motley Fool’s Top Dividend Stock for 2017.”

By clicking this button, you agree to our Terms of Service and Privacy Policy. We will use your email address only to keep you informed about updates to our website and about other products and services we think might interest you. You can unsubscribe from Take Stock at anytime. Please refer to our https://www.fool.com.au/financial-services-guide">Financial Services Guide (FSG) for more information.

Motley Fool contributor Tom Richardson owns shares of Sirtex Medical Limited.

You can find him on Twitter @tommyr345

 

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.