How a buyback mechanically lifts earnings per share
EPS = Net Income / Shares Outstanding
Now the arithmetic: when shares outstanding falls, EPS mechanically rises. If Net Income is $100M and Shares Outstanding is 100M, EPS = $1.00. Buy back 10M shares (10% of the shares outstanding) at $20 each and Shares Outstanding drops to 90M. EPS now equals $100M / 90M = $1.11 — an 11% lift in EPS without changing the business at all. That mechanical lift is the simplest version of the buyback argument, and also the cleanest version of the criticism: an EPS-driven number that looks like growth but isn't.
When a buyback creates value versus destroys it
Buybacks create value for remaining shareholders when the company buys back stock at a price BELOW its intrinsic value (what the business is fundamentally worth, separate from its current stock price). Buybacks destroy value when the company buys back stock at a price ABOVE intrinsic value — overpaying for its own shares is the same kind of capital-allocation mistake as overpaying for an acquisition. The disciplined principle is: repurchases make sense only when (a) the shares are priced below intrinsic value, AND (b) the business's reinvestment needs and balance-sheet health (debt levels, cash cushion) are already funded. In practice, most companies buy back stock when the stock price is high (and cash is abundant) and stop when the price is low (and cash is scarce) — the opposite of value-creating discipline.
Check a company's buyback yield and timing
Pitfall: per-share growth that is not real growth
Compare a company growing EPS roughly 8% per year in two scenarios. Scenario A: Net Income grew 8% and shares outstanding stayed flat — that's real operating growth. Scenario B: Net Income grew 3% and shares outstanding shrunk 5% via buybacks — EPS growth of roughly 8.4%, close enough to A's 8% that markets routinely treat the two as equivalent — but only 3 percentage points of it are real operating growth; the rest is financial engineering. Management compensation tied to EPS targets routinely encourages Scenario B even when the buyback math doesn't create value. When you see EPS growth advertised, divide it by the share count change to see how much is operating versus financial-engineering. Debt-funded buybacks compound the risk: the company swaps equity (which absorbs losses) for debt (which doesn't) to manufacture EPS growth, weakening the balance sheet in the process. When you need the full mechanics — capital-allocation discipline applied across all five CEO choices, and the NPV-vs-IRR test for buyback-vs-reinvestment decisions — see val-10 "Capital Allocation: The CEO's Five Choices", dcf-7 "The Four IRR Pitfalls: Why NPV Wins for Owners", and corpval-5 "Capital Structure Optimization: Finding the Sweet Spot" (which covers debt-funded buybacks specifically).
Sit with the ideas.
Westmoor Industries earns $80M of net income on 40M shares outstanding (EPS = $2.00). Management spends $120M on a share buyback at $30 per share. An independent analyst estimates Westmoor's intrinsic value at $25 per share. What is Westmoor's new EPS, and was the buyback a value-creating use of cash?