Earnings surprises: EPS, revenue, guidance, and price reaction
An EPS beat does not guarantee a rising share price. Separate reported earnings, revenue quality, forward guidance, and what was already priced in, using comparable periods, currencies, and accounting definitions.
Contents
Calculate a comparable surprise
One common convention is (actual EPS minus estimated EPS) divided by the absolute estimate. Hypothetical EPS of 1.10 against 1.00 is a 10% beat. A loss of 0.10 against an expected loss of 0.20 is a positive 50% surprise, but remains a loss.
A zero estimate makes the percentage undefined; near-zero estimates exaggerate percentages. Preserve the absolute difference and verify the data provider's convention.
GAAP and adjusted measures
Compare the same fiscal period, diluted or basic share definition, currency, and GAAP or non-GAAP basis. Check company releases and reconciliation tables rather than comparing incompatible numbers.
Review revenue, operating margins, share count, cash flow, and guidance separately. Changes in taxes or share count can affect EPS without the same change in operating demand.
Separate publication from price reaction
Confirm the release time with investor relations and account for US daylight saving. Taiwan is normally 12 or 13 hours ahead of US Eastern time.
Record the press release, call, after-hours session, next open, and next close separately. Compare sector and broad-market moves; timing alone does not establish why a price changed.
Frequently asked questions
Can a loss-making company beat expectations?⌄
Yes. Losing less than expected is a beat, not a profit.
Are calendar dates guaranteed?⌄
No. Estimated schedules can change; verify company announcements.
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