Operating cash flow and free cash flow are often used interchangeably in conversation, but in a filing they are two different things with two different pedigrees. Operating cash flow — formally, net cash provided by operating activities — is a line on the GAAP statement of cash flows. It measures the cash a company actually generated from running its business over the period: net income adjusted for non-cash charges like depreciation and stock-based compensation, and for changes in working capital such as receivables, payables, and deferred revenue. It is a reported, reviewed-or-audited figure that every public company presents under standardized rules.

Free cash flow is a step beyond that, and it is not a GAAP figure. It begins with operating cash flow and subtracts the capital investment the business required, most importantly purchases of property and equipment (capital expenditures). The reasoning is that cash consumed buying and maintaining the assets needed to operate is not truly "free" to return to investors or deploy elsewhere, so removing it gives a cleaner read on discretionary cash generation. Because free cash flow is constructed by the company, the exact items it subtracts are defined by the filer — and those definitions differ. CrowdStrike's first-quarter fiscal-2027 results spell its definition out:

"Free cash flow is a non-GAAP financial measure that CrowdStrike defines as net cash provided by operating activities less purchases of property and equipment, capitalized internal-use software and website development costs, and purchases of and proceeds from deferred compensation investments, net."— CrowdStrike Holdings, Inc., Q1 FY2027 earnings press release, Form 8-K Exhibit 99.1, source

That definition is doing the work that separates the two measures. The starting point is the GAAP line — net cash provided by operating activities. Then the company names precisely what it subtracts: property-and-equipment purchases, capitalized internal-use software and website costs, and certain deferred-compensation investment flows. A different company might subtract only capital expenditures, or might add other items, which is why two free-cash-flow figures are not automatically comparable. The subtraction list, not the label, defines the metric.

How the two relate in practice

The numbers from the same release illustrate the relationship. CrowdStrike reported free cash flow of $468.5 million for the quarter against $279.4 million in the prior-year first quarter, while operating cash flow that earlier period was $384.1 million. The gap between operating and free cash flow in any period is the sum of the capital and capitalized-cost items the company subtracts — so free cash flow is always lower than operating cash flow when a business is investing in property, equipment, and capitalized software. For an asset-light software business, that gap is typically modest relative to a capital-intensive industry, which is one reason free cash flow margins can run high for mature SaaS companies.

The same release is careful to flag the limits of the measure, and the caution is worth carrying. It notes that while free cash flow is useful in evaluating the business, it "is a non-GAAP financial measure that has limitations as an analytical tool, and free cash flow should not be considered as an alternative to, or substitute for, net cash provided by operating activities in accordance with GAAP." That is the company stating, in its own filing, that the GAAP operating-cash-flow line is the anchor and free cash flow is a supplement — exactly the posture the SEC's non-GAAP rules require, which is that any non-GAAP measure be reconciled to and presented with no greater prominence than the comparable GAAP figure.

Reading the two without conflating them

One feature of subscription businesses makes both measures behave distinctively, and it is worth understanding before drawing conclusions from a single quarter. Because customers frequently pay annually in advance, operating cash flow is heavily influenced by the timing of billings: a quarter with many large up-front renewals collects cash that will be recognized as revenue only over the following year, so operating cash flow — and therefore free cash flow — can run well ahead of recognized net income. That is the change in deferred revenue flowing through the working-capital section of the cash-flow statement. The flip side is seasonality: quarters heavy with renewals show strong cash generation, while quarters light on renewals show weaker cash even if the underlying business is unchanged. For this reason, free cash flow for a subscription vendor is most meaningfully read on a trailing-twelve-month basis or against the same quarter a year earlier, rather than sequentially, so that billing seasonality does not masquerade as a change in cash-generating capacity.

The disciplined frame is to treat operating cash flow as the GAAP foundation and free cash flow as a company-defined derivative of it. When a vendor highlights a free-cash-flow figure, the grounded steps are: find the GAAP operating-cash-flow line on the statement of cash flows, read the company's stated free-cash-flow definition, and confirm which items it subtracts. Two checks matter most. First, does the definition subtract only maintenance-style capital expenditures, or also capitalized software and other items that effectively move operating costs off the income statement and into the cash-flow deduction? Second, is the company's definition stable quarter to quarter, so the trend is comparable to itself? Because there is no mandated free-cash-flow formula, a change in definition can move the figure independent of the underlying business.

Used carefully, the pair tells a fuller story than either alone. Operating cash flow shows how much cash the business itself threw off; free cash flow shows how much remained after the investment the company says it needed to keep running and growing. Both belong in the analysis, but only operating cash flow is governed end to end by GAAP. The authoritative reference for what a given company's free cash flow includes — and excludes — is the definition printed in its own filing, which is why reading that definition is the first step before comparing the figure to anything.