A fresh Form 4 filing shows Cascade Investment, L.L.C., a 10%+ owner of Republic Services, Inc. (NYSE: RSG), purchased 3,200 shares of the waste-management giant on August 11, 2026, at $214.67 per share. The single transaction was worth $686,951.36 and lifted Cascade’s directly held stake to 111,068,846 shares.
That trade, however, is just one piece of a much bigger picture. Regulatory disclosures show Cascade Investment made seven separate open-market purchases of RSG stock between August 10 and August 11, 2026, with combined spending of $108,145,762. Whoisbuyingnow.com’s internal classification flags this activity as a ‘cluster buy’ — a designation reserved for cases where an insider makes multiple purchases in a tight window rather than a single, isolated trade.
Why the Pattern Matters More Than the Single Trade
Individual insider purchases happen for all sorts of reasons and don’t always signal much on their own. Clustered buying, where the same insider repeatedly steps into the open market over a short stretch of days, is a different kind of signal. It suggests a deliberate, sustained allocation of capital rather than a one-off transaction, and it’s the kind of pattern that tends to draw more attention from filing trackers and researchers alike.
Academic studies on insider trading have found that clusters of open-market purchases, particularly by significant shareholders, are statistically associated with periods of subsequent outperformance in the underlying stock, on average and across large samples. That research describes a historical correlation, not a guarantee, and it says nothing about what happens with any individual company or filing. This article is a report on a disclosed regulatory event, not a suggestion to act on it.
Cascade Investment’s position as a 10%+ owner of Republic Services means its trading activity is closely tracked under SEC beneficial ownership rules, and its purchases are disclosed via Form 4 filings shortly after they occur. The scale of the recent buying — over $108 million across just two trading days — places this cluster among the more notable insider-buying events tracked on this site in terms of total dollar value, even though each individual line item, like the 3,200-share purchase highlighted here, may look modest in isolation.
Republic Services shares changed hands at $214.67 in the transaction detailed in this filing. With Cascade’s post-transaction holdings now standing at 111,068,846 shares held directly, the position remains one of the largest single blocks of RSG stock outside the company’s own treasury. Further Form 4 filings related to this cluster may still be forthcoming as the disclosure window closes.
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Source: original SEC Form 4 filing.