Republic Services, Inc. (NYSE: RSG) is once again in focus after its largest shareholder, Cascade Investment, L.L.C., disclosed another open-market purchase of the company’s stock. According to a Form 4 filed with the SEC, Cascade bought 100 shares on August 17, 2026, at $213.00 per share, a transaction worth $21,300.00. Following the purchase, Cascade’s directly held stake stands at 111,817,956 shares.
On its own, a $21,300 purchase would barely register for an investor of Cascade’s size. But this transaction is the latest entry in a much larger and more telling pattern. Regulatory filings show that between August 10 and August 17, 2026, Cascade Investment executed 19 separate open-market purchases of Republic Services stock, with a combined value of $263,118,446. That is a sustained, near-daily buying campaign spanning more than a week, not an isolated trade.
A Pattern That Keeps Growing
Whoisbuyingnow.com has tracked this activity as it has unfolded. Earlier in the window, we reported on Cascade Investment’s $186M August Buying Spree, which itself marked a significant escalation from an earlier round of purchases. The latest $21,300 transaction confirms the buying has continued right through August 17, extending the total tally past a quarter of a billion dollars in just eight days.
Cascade Investment, the investment vehicle associated with Bill Gates, holds a 10%-plus ownership stake in Republic Services and is classified as such in SEC filings, meaning its trades are subject to insider reporting requirements even though it is not a company officer or director. Because Cascade’s position is already enormous, individual trades of a few hundred shares are best understood as incremental additions layered onto a much larger accumulation pattern rather than standalone signals.
Our classification system flags this activity as a cluster buy, a designation reserved for situations where multiple purchases from the same insider occur in rapid succession over a short window. Academic research on insider trading has found that clustered buying by multiple insiders, or repeated buying by a single large holder, has historically correlated with periods of subsequent outperformance in aggregate studies, though such findings are statistical tendencies across large samples rather than predictions about any single company or filing.
This filing does not constitute investment advice, and readers should treat it as a factual record of disclosed activity. Whoisbuyingnow.com will continue monitoring Republic Services filings for any additional transactions from Cascade Investment as the pattern develops.
→ See all RSG coverage on WhoIsBuyingNow
Source: original SEC Form 4 filing.