Cascade Investment, L.L.C., the investment vehicle associated with Republic Services, Inc. (RSG) and classified as a 10%+ Owner of the waste management giant, disclosed another open-market purchase of company stock in a Form 4 filing. On August 21, 2026, Cascade bought 9,038 shares at $219.59 apiece, a transaction worth $1,984,630.02.
Following the purchase, Cascade’s directly held position in Republic Services stands at 112,621,588 shares. The size of that stake underscores just how significant Cascade’s ownership interest in the company remains, even as this particular transaction is modest relative to the firm’s overall holdings.
Part of a Larger Buying Pattern
What makes this filing notable is not the single trade itself but the broader pattern it belongs to. Between August 11 and August 21, 2026, Cascade has now made 34 separate open-market purchases of Republic Services shares, with combined spending reaching $378,476,049. That is a substantial and sustained commitment of capital over a short window, and it fits the profile of what whoisbuyingnow.com classifies as a cluster buy — a signal type that flags repeated insider purchasing activity concentrated in a tight timeframe.
This is the latest chapter in a buying campaign that has been building for weeks. We covered an earlier stage of this same pattern in RSG: Cascade’s August Buying Spree Tops $346M, when the cumulative total had already crossed the $346 million mark. The latest disclosure shows the streak has continued and grown since then, with the total now exceeding $378 million across the 34 tracked transactions.
Academic research on insider trading has found that clustered purchasing activity — multiple insiders or the same insider buying repeatedly over a short period — has historically correlated with periods of stock outperformance relative to the broader market. That said, this pattern reflects disclosed trading activity as of the filing date and should be read as a record of what has already happened, not as a projection of what will happen next.
Republic Services shareholders and market watchers will likely continue monitoring subsequent Form 4 filings to see whether Cascade’s buying activity persists past August 21 or whether this marks a pause in the current streak. Each new filing adds another data point to what has already become one of the more closely watched insider buying patterns tracked on this site this quarter.
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Source: original SEC Form 4 filing.