---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-049438"
form_type: "8-K"
ticker: "KALU"
cik: "0000811596"
company_name: "KAISER ALUMINUM CORP"
filed_at: "2025-04-02T23:59:59+00:00"
generated_at: "2026-05-24T00:11:23.951236+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Kaiser Aluminum changes inventory accounting from LIFO to WAC; restates 2023-2024 results

## Summary
- Effective Jan 1, 2025, switches from LIFO to weighted average cost for virtually all inventories; applied retrospectively.
- Restated 2023: net income increased $20.6M to $67.8M; retained earnings as of Dec 31, 2023: $66.3M (up $56.2M).
- Restated 2024: net income increased $18.9M to $65.7M; retained earnings as of Dec 31, 2024: $81.3M (up $75.1M).
- Inventory increased $73.5M to $550.7M at Dec 31, 2023, and $98.0M to $601.9M at Dec 31, 2024.
- Company cites improved comparability, better reflects physical flow of goods, and simplifies financial close.

## SEC filing metadata
- accession: 0000950170-25-049438
- form_type: 8-K
- ticker: KALU
- cik: 0000811596
- company_name: KAISER ALUMINUM CORP
- filed_at: 2025-04-02T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/811596/000095017025049438/0000950170-25-049438-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/811596/000095017025049438/kalu-20250402.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-049438
- JSON: https://secwatch.observer/filing/0000950170-25-049438.json
- Plain text: https://secwatch.observer/filing/0000950170-25-049438.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.