The fact that multiple Blueprint Medicines Corporation (NASDAQ:BPMC) insiders offloaded a considerable amount of shares over the past year could have raised some eyebrows amongst investors. When evaluating insider transactions, knowing whether insiders are buying versus if they selling is usually more beneficial, as the latter can be open to many interpretations. However, if numerous insiders are selling, shareholders should investigate more.

Although we don't think shareholders should simply follow insider transactions, logic dictates you should pay some attention to whether insiders are buying or selling shares.

Blueprint Medicines Insider Transactions Over The Last Year

In fact, the recent sale by Kathryn Haviland was the biggest sale of Blueprint Medicines shares made by an insider individual in the last twelve months, according to our records. That means that an insider was selling shares at around the current price of US$87.71. While insider selling is a negative, to us, it is more negative if the shares are sold at a lower price. In this case, the big sale took place at around the current price, so it's not too bad (but it's still not a positive).

In the last year Blueprint Medicines insiders didn't buy any company stock. The chart below shows insider transactions (by companies and individuals) over the last year. If you click on the chart, you can see all the individual transactions, including the share price, individual, and the date!

If you like to buy stocks that insiders are buying, rather than selling, then you might just love this free list of companies. (Hint: insiders have been buying them).

Blueprint Medicines Insiders Are Selling The Stock

Over the last three months, we've seen significant insider selling at Blueprint Medicines. In total, insiders sold US$4.6m worth of shares in that time, and we didn't record any purchases whatsoever. Overall this makes us a bit cautious, but it's not the be all and end all.

Insider Ownership

Many investors like to check how much of a company is owned by insiders. I reckon it's a good sign if insiders own a significant number of shares in the company. It appears that Blueprint Medicines insiders own 1.2% of the company, worth about US$67m. While this is a strong but not outstanding level of insider ownership, it's enough to indicate some alignment between management and smaller shareholders.

So What Does This Data Suggest About Blueprint Medicines Insiders?

Insiders sold stock recently, but they haven't been buying. And there weren't any purchases to give us comfort, over the last year. While insiders do own shares, they don't own a heap, and they have been selling. We'd practice some caution before buying! So while it's helpful to know what insiders are doing in terms of buying or selling, it's also helpful to know the risks that a particular company is facing. At Simply Wall St, we found 2 warning signs for Blueprint Medicines that deserve your attention before buying any shares.

But note: Blueprint Medicines may not be the best stock to buy. So take a peek at this free list of interesting companies with high ROE and low debt.

For the purposes of this article, insiders are those individuals who report their transactions to the relevant regulatory body. We currently account for open market transactions and private dispositions of direct interests only, but not derivative transactions or indirect interests.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.