When a security vendor reports two versions of operating income or net income in the same release — one labeled GAAP and one labeled "non-GAAP" or "adjusted" — it is showing you a regulated, defined distinction, not a marketing flourish. GAAP figures are the numbers produced under Generally Accepted Accounting Principles and presented in the audited financial statements: revenue, cost of revenue, operating expenses, net income, all computed by the standardized rules every U.S. public filer follows. A non-GAAP figure starts from one of those GAAP numbers and then adjusts it, almost always by excluding specific expense items, to produce a measure management argues better reflects the underlying operating business. The crucial point is that the non-GAAP number is constructed by the company, not by the accounting standard, which is exactly why the SEC regulates how it may be shown.

The definition is not informal. The SEC's Regulation S-K, in the item governing non-GAAP measures, defines the term precisely:

"For purposes of this paragraph (e), a non-GAAP financial measure is a numerical measure of a registrant's historical or future financial performance, financial position or cash flows that: (i) Excludes amounts, or is subject to adjustments that have the effect of excluding amounts, that are included in the most directly comparable measure calculated and presented in accordance with GAAP in the statement of comprehensive income, balance sheet or statement of cash flows (or equivalent statements) of the issuer."— 17 CFR 229.10(e), Regulation S-K, source

That definition does two things. It establishes that a non-GAAP measure is defined by its relationship to "the most directly comparable" GAAP measure — there is always a GAAP number it departs from — and it makes the exclusion (or inclusion) of specific amounts the defining feature. The same rule then constrains presentation: a filer must present, with equal or greater prominence, the most directly comparable GAAP measure, and must provide a reconciliation showing exactly how it bridged from the GAAP number to the non-GAAP one. In practice that reconciliation is where the analysis happens, because it itemizes every adjustment.

What gets excluded, and why it matters

The adjustments are not random; in software and security they cluster around a recognizable set of items. CrowdStrike's first-quarter fiscal-2027 results, furnished with its earnings 8-K, describe what its guidance for non-GAAP measures leaves out: "stock-based compensation expense and related employer payroll taxes, amortization of acquired intangible assets (including purchased patents), acquisition-related expenses (credits), net, amortization of debt issuance costs and discount, mark-to-market adjustments on deferred compensation liabilities, legal reserve and settlement charges or benefits," and incident-related costs, among others. Each of those is a real GAAP expense; the non-GAAP figure simply sets it aside.

The largest and most consequential exclusion for most software companies is stock-based compensation. It is a genuine, recurring cost — the company is compensating employees with equity that dilutes shareholders — but because it is a non-cash charge, management typically excludes it from adjusted profitability. Amortization of acquired intangibles is similar: it is a non-cash charge that flows from past acquisitions, so companies remove it to show the operating performance of the combined business. Acquisition-related and one-time legal or restructuring items are excluded on the argument that they are not part of normal operations. None of these exclusions is improper under the rules, but each one widens the gap between the GAAP result and the adjusted result, and the direction is almost always the same: non-GAAP profitability is higher than GAAP profitability because the adjustments overwhelmingly remove expenses.

How to read the two side by side

The disciplined approach is the one the SEC's prominence rule is built to enable: never read the adjusted figure in isolation, and always trace it back to the GAAP line it adjusts. Pull the reconciliation, read the list of excluded items, and ask which of them are recurring. Stock-based compensation that recurs every quarter at a large scale is a real economic cost to shareholders even if it is non-cash; excluding it produces a profit number that overstates what is left for owners after the true cost of equity compensation. By contrast, a genuinely one-time legal settlement is more defensibly excluded. The exclusions are not equally legitimate, and the reconciliation is where you judge them.

It is also why comparing one company's "adjusted EPS" to another's can mislead. Because each company chooses its own adjustments within the rule's bounds, two filers' non-GAAP measures may exclude different things. The GAAP figure, by contrast, is computed under common rules and is the comparable baseline across companies. When a management team leads with an adjusted number on an earnings call, the grounded move is to find the comparable GAAP figure — the rule guarantees it is disclosed with at least equal prominence — and read the reconciliation between them. The difference between GAAP and non-GAAP is not noise; it is an itemized list of choices, and the filing requires the company to show you every one.

Put simply: GAAP tells you what the standardized rules produced; non-GAAP tells you what the company's results look like after management removes the items it considers non-operating or non-cash. Both can be informative, but only one is governed end to end by the accounting standard. The SEC's definition and its reconciliation-and-prominence requirements exist precisely so that a reader can always recover the GAAP number underneath any adjusted headline — and that recovery is the entire discipline of reading earnings honestly.