In the last year, many Clean Harbors, Inc. (NYSE:CLH) insiders sold a substantial stake in the company which may have sparked shareholders' attention. When evaluating insider transactions, knowing whether insiders are buying is usually more beneficial than knowing whether they are selling, 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, we would consider it foolish to ignore insider transactions altogether.

The Last 12 Months Of Insider Transactions At Clean Harbors

Over the last year, we can see that the biggest insider sale was by the Founder, Alan McKim, for US$13m worth of shares, at about US$184 per share. That means that an insider was selling shares at slightly below the current price (US$244). When an insider sells below the current price, it suggests that they considered that lower price to be fair. That makes us wonder what they think of the (higher) recent valuation. While insider selling is not a positive sign, we can't be sure if it does mean insiders think the shares are fully valued, so it's only a weak sign. It is worth noting that this sale was only 2.5% of Alan McKim's holding.

Clean Harbors insiders didn't buy any shares over the last year. You can see a visual depiction of insider transactions (by companies and individuals) over the last 12 months, below. By clicking on the graph below, you can see the precise details of each insider transaction!

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

Clean Harbors Insiders Are Selling The Stock

The last quarter saw substantial insider selling of Clean Harbors shares. Specifically, Independent Director Andrea Robertson ditched US$274k worth of shares in that time, and we didn't record any purchases whatsoever. This may suggest that some insiders think that the shares are not cheap.

Insider Ownership

Looking at the total insider shareholdings in a company can help to inform your view of whether they are well aligned with common shareholders. I reckon it's a good sign if insiders own a significant number of shares in the company. Clean Harbors insiders own about US$794m worth of shares (which is 6.0% of the company). I like to see this level of insider ownership, because it increases the chances that management are thinking about the best interests of shareholders.

So What Does This Data Suggest About Clean Harbors Insiders?

An insider sold stock recently, but they haven't been buying. And even if we look at the last year, we didn't see any purchases. The company boasts high insider ownership, but we're a little hesitant, given the history of share sales. In addition to knowing about insider transactions going on, it's beneficial to identify the risks facing Clean Harbors. For example - Clean Harbors has 1 warning sign we think you should be aware of.

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of interesting companies, that have HIGH return on equity 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.