A segment's name is not enough to make its revenue comparable across years. To track changes in a company's segment reporting, identify every change in its reporting perimeter, obtain the company's recast comparative tables, and rebuild the historical series on one consistent basis. Keep the original figures and each subsequent recast as separate, dated versions. Otherwise, a change in presentation can look like an operating collapse or a growth surge.
Nokia's 2026 disclosures show why this matters. Its FY2025 Portfolio Businesses net sales were €845 million in the segment recast published on 29 January 2026, but €379 million in the later recast published on 23 July 2026. The €466 million difference is between two presentations of the same FY2025 period, not a year-on-year sales decline. The July tables reflect the classification of two businesses as discontinued operations. Sources: Nokia's January segment recast and July discontinued-operations recast.
What counts as a segment reporting change?
A company can reorganise its reportable segments, move a product line between divisions, combine businesses, dispose of a unit, or change the way management reviews results. These are different events. A new segment label may represent a different set of activities; a discontinued operation can also change the continuing-operations figures presented for prior periods.
For IFRS reporters, IFRS 8, paragraphs 29–30, addresses comparative segment information after a change in organisational structure. Earlier periods are generally restated unless the information is unavailable and developing it would be excessively costly. When comparatives are not restated, additional disclosure requirements can apply. Restated segment data is not necessarily a correction of an accounting error; it may simply put an earlier period on the new organisational basis.
A worked example: Nokia changed its segment map twice in 2026
First change — 1 January 2026: a new operating structure. Nokia moved from four reportable segments — Network Infrastructure, Mobile Networks, Cloud and Network Services, and Nokia Technologies — to three reportable segments: Network Infrastructure, Mobile Infrastructure, and Portfolio Businesses. Network Infrastructure and Mobile Infrastructure were described as the two primary segments. Nokia published a new FY2025 and FY2024 comparative segment series on 29 January 2026. Nokia, 29 January 2026.
The new Mobile Infrastructure brought together Core Software, Radio Networks and Technology Standards, including the former Nokia Technologies business. Portfolio Businesses grouped several non-core units, including Fixed Wireless Access CPE and Enterprise Campus Edge. The recast was designed to make the old periods readable in the new structure.
Second change — Q2 2026: discontinued operations. Nokia subsequently classified Fixed Wireless Access CPE and Enterprise Campus Edge as discontinued operations and published another set of recast 2025 comparatives on 23 July 2026. The change affected the presentation of Portfolio Businesses and had smaller effects elsewhere. The January and July FY2025 tables therefore should not be treated as interchangeable. Nokia, 23 July 2026.
The same FY2025 period, two different reported histories
Nokia FY2025 measure | 29 Jan 2026 segment recast | 23 Jul 2026 discontinued-operations recast | Difference between presentations |
|---|---|---|---|
Portfolio Businesses net sales | €845m | €379m | −€466m |
Network Infrastructure net sales | €7,646m | €7,646m | €0m |
Mobile Infrastructure net sales | €11,409m | €11,445m | +€36m |
All amounts are EUR millions for the same year ended 31 December 2025. The last column is calculated as July presentation minus January presentation. It is not an operating growth rate. Figures come from Nokia's two official recast releases dated 29 January and 23 July 2026, linked above.
The most instructive row is Portfolio Businesses: €379m is about 55% below €845m, but calling that a 55% decline in FY2025 segment revenue would be wrong. The two figures refer to the same financial year with different reporting scopes. Nokia's Q3 2026 interim report, Note 2 describes the revised segment structure, while Note 3 discusses the discontinued operations. 17 20
Five checks before charting a multi-year segment series
1. Search for the change, not just the segment name. In annual and interim reports, look for “change in reporting structure”, “recast comparative”, “segment information”, “reclassification” and “discontinued operations”. For a US issuer, search its 10-K and 10-Q notes for segment changes and retrospective disclosures.
2. Draw a segment mapping. Record which old businesses moved into which new reporting segments, including units removed from continuing operations. Avoid equating similarly named segments without checking their composition.
3. Choose one presentation basis. For a 2024–2026 chart of Nokia's new segments, start with the latest available recast series. Use the January 2026 tables to understand the organisational change and the July tables for the later discontinued-operations presentation. Confirm whether the latest quarterly filing contains further updates before extending the series.
4. Preserve the metric definition. Segment “operating profit” may be a management measure and need not equal group IFRS operating profit. Keep reported and comparable measures distinct, identify eliminations and Group Common and Other, and do not sum segment revenues into group revenue without checking intersegment amounts.
5. Keep a revision trail. Store the company, period, segment, metric, unit, release date, reporting basis, source URL and any superseding disclosure. A revised historical value should be traceable to the exact release that changed it.
What a source-backed AI workflow should do
An AI assistant can accelerate this work, but it must retrieve the issuer's recast disclosures rather than infer segment mappings from names. Clarifo brings searchable Nordic and US filings, structured financials and filing-linked evidence into ChatGPT and Claude through its MCP integration. For covered issuers, the assistant can search for the relevant notes and return the source location for verification. A structured financial series is a starting point; the company's latest recast remains the authority for segment comparability.
Try this question with Clarifo connected:
Find Nokia's 29 January 2026 segment recast, its 23 July 2026 discontinued-operations recast, and the segment notes in Q3 2026. Build a table of FY2025 segment net sales under both recast presentations. Explain the mapping, distinguish reclassification from operating growth, cite the original source pages, and flag any series that cannot be reconciled. Do not merge historical values from different reporting bases.
The analyst should open the cited filings and confirm the mapping before publishing a growth chart or using the series in a model. This workflow applies just as well to US issuers that reorganise their segment reporting, although their disclosure framework and filing formats differ.
Frequently asked questions
Should I use the original annual report or the latest recast?
For a trend analysis on the current segment structure, use the latest relevant comparative recast when available, and preserve the original report for auditability. If you are reconstructing what investors knew at an earlier date, use the disclosure available at that date and label it accordingly.
Is a segment recast the same as an accounting restatement?
No. A recast may reflect changes in the composition or presentation of segments, not an error in previously issued group financial statements. Read the company's explanation and do not assume the group totals changed.
Can I compare two companies' segment margins directly?
Only after checking segment scope and the profit measure each company uses. Two businesses can label a metric “segment operating profit” while allocating corporate costs, restructuring charges or other items differently.
Takeaway
The safest segment trend is one metric, one consistent reporting basis, with a dated link to every recast. Nokia's 2026 sequence demonstrates that the same FY2025 segment can carry materially different figures in two official releases without any intervening FY2025 operating change.
Research the source, then build the chart. Explore Clarifo's MCP integration to search covered company filings from ChatGPT or Claude. For a related guide to primary Nordic documents, see Nordic equity research data: start from the primary filings.
Sources and methodology
Nokia, recast comparative segment results, 29 January 2026. Official tables for FY2024 and FY2025, including quarterly FY2025 segment figures.
Nokia, recast discontinued-operations comparative information, 23 July 2026. Official FY2025 and 2026 comparative tables.
Nokia, Q3 2026 interim report, Note 2, p. 17 and Note 3, p. 20, original filing pages surfaced through Clarifo.
IFRS 8 Operating Segments, paragraphs 29–30, IFRS Foundation.
Figures and differences are stated in EUR millions, rounded as Nokia reported. Differences are calculated between publication versions of FY2025, not across fiscal years. No market-price or investment recommendation is implied.
Educational financial reporting research, not investment advice.