One of us previously wrote on the tax treatment of stock buybacks. Prior to a rule change by the Securities and Exchange Commission in 1982, publicly traded corporations faced strict limits in the number of shares they could buy back. The 1982 rule change effectively gave corporations a choice: They could use their profits to buy shares on the open market, with no meaningful limit, or they could distribute their profits as dividends to their shareholders, taxable at the same rate as ordinary income.

The rule the Securities and Exchange Commission changed was related to insider trading; the SEC might not care about the tax consequences of share buybacks, but everyone else involved surely does. As noted in the post, the shareholders who don’t sell when a corporation buys back shares are the beneficiaries of the rule change:

To understand the impact of the SEC rule change, focus on the shareholders who don’t sell any shares in connection with a buyback. They’re the ones who reap the tax benefit. The selling shareholders were going to sell anyhow. We’re talking about publicly traded stock here. The decision to sell has nothing to do with the corporation’s decision to buy, and a selling shareholder has no idea who buys their publicly traded shares. The corporation doesn’t benefit either. It’s just shedding cash either way.

The concentration of American wealth—and the accompanying concentration of political power—now poses an existential threat to our democracy. Stock buybacks have made this situation measurably worse than it otherwise would have been.

But not all non-selling shareholders benefit from stock buybacks. If you own stock inside an IRA, the corporation’s decision whether to buy shares or issue dividends is not critical to you. You avoid an immediate income tax consequence either way. And if you don’t want a stock buyback to cause an increase in your ownership interest in the corporation, you can sell a few shares off, also without tax consequence, and create an economic result identical to that of a dividend.

The same applies to shares held by other retirement accounts, pension plans, university endowment funds, and other tax-exempt entities.

That leaves the ultra-rich—and especially the billionaires—as the main beneficiaries of stock buybacks. The benefits are enormous, and become ever larger as we move up the wealth scale.

The situation of Google co-founders Larry Page and Sergey Brin exemplifies the wealth concentrating impact of the SEC rule change. Alphabet, which became the publicly traded parent of Google in a 2015 reorganization, has bought back a lot of shares over the past 11 years. Page and Brin, the third and fourth wealthiest Americans, respectively, have a combined wealth totaling over half a trillion dollars. As of October 16, the two held a combined total of 14,960,019,745 shares of Alphabet stock—778,102,320 for Page and 717,917,425 for Brin—which they’d held at least since Google’s IPO in 2004 (adjusted for stock splits over that period).

Brin is leading the opposition to California’s Proposition 40, which would impose a one-time wealth tax of 5% on all residents of California as of January 1, 2026 with personal wealth exceeding $1 billion. Brin claims to have changed his state of residence to Nevada prior to that date, although it’s not clear whether the steps he took to accomplish that change were sufficient to avoid California residence for purposes of Proposition 40. To date, Brin has contributed over $100 million to groups opposing Proposition or supporting Propositions 41 and 42, which effectively would nullify Proposition 40.

Page, similarly, has moved to Florida, although it’s not clear if he has avoided being a California resident as of January 1, 2026.

If Proposition 40 passed and if Brin’s attempt to avoid California residency were unsuccessful, his tax liability would be in the $12 billion to $14 billion range. His co-founder Page would face a slightly higher tax liability under Proposition 40. Their total liability would be around $28 billion, give or take a few billion.

I was curious how Page and Brin’s prospective Proposition 40 tax liability compares with the wealth they now hold that’s attributable to the 1982 SEC rule change. Would........

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