Warren Buffett

Led Berkshire Hathaway's coordinated block purchases of A2Z common stock in 2024, executing multiple large OTC and exchange trades that materially increased ownership and were reported in regulatory filings. The purchases were structured through affiliated entities and disclosed via SEC filings that shifted market attention from short-term trading to strategic ownership metrics. The immediate market effect was a measurable tightening of available float: volume-weighted average spreads compressed during the accumulation window, while intraday liquidity declined as original sellers reduced supply. Those trading dynamics forced primary market makers to widen quoting sizes and adjust risk limits, which in turn altered how options market makers priced implied volatility on A2Z derivatives. At the governance level the stake enabled nomination of board candidates and opened direct dialogue with A2Z executive management about capital allocation, dividend policy and long-term industrial strategy. Public statements from Berkshire and subsequent 13D/13G disclosures changed analyst coverage and investor models, reclassifying A2Z from a high-turnover small-cap into a stock with significant strategic anchoring. The combination of concentrated institutional ownership, altered liquidity, and formal governance engagement had persistent effects on A2Z's secondary market: trading patterns, index eligibility assessments, and corporate financing terms were all repriced in the year following Berkshire's entry, illustrating a concrete causal chain from block acquisition to market structure outcomes.