In a just published Form 13, filed with the US Securities and Exchange Commission (SEC), Armstrong World Industries Inc. (NYSE:AWI) reported that Iridian Asset Management has picked up 5,622,876 of common stock as of 2017-04-04.

The acquisition brings the aggregate amount owned by Iridian Asset Management to a total of 5,622,876 representing a 10.4% stake in the company.

For those not familiar with the company, Armstrong World Industries, Inc. (AWI) is a global producer of ceiling systems. The Company owns and operates the Building Products (Ceilings) segment. The Company designs, manufactures and sells ceiling systems (primarily mineral fiber, fiberglass wool and metal) around the world. Its products are used in commercial and institutional buildings. Its geographical segments include Americas (including Canada); Europe, Middle East and Africa (including Russia) (EMEA), and Pacific Rim. As of December 31, 2016, it had 15 manufacturing plants in eight countries, including six plants located throughout the United States. Its Americas segment sells products for use in single and multi-family housing. It sells commercial products to building materials distributors re-selling its products to contractors, subcontractors’ alliances, architect and design firms, and facility owners. Residential ceiling products are sold in the Americas primarily to wholesalers and retailers.

A glance at Armstrong World Industries Inc. (NYSE:AWI)’s key stats reveals a current market capitalization of 2.38 Billion based on 53.84 Million shares outstanding and a price at last close of $45.30 per share.

Looking at insider activity, there are a few transactions worth noting.

Specifically, on 2016-11-02, Templin picked up 2,670 at a purchase price of $37.16. This brings their total holding to 4,816 as of the date of the filing.

On the sell side, the most recent transaction saw Mcnamara unload 2,274 shares at a sale price of $45.00. This brings their total holding to 2,968.

It’s possible to gauge a company’s potential by tracking the activity of its major holders, as well as checking in on insider activity such as those transactions listed above. We’ll be keeping an eye on Armstrong World Industries Inc. (NYSE:AWI) as things move forward to see if its progress aligns with these transactions.

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