---
schema_version: "secwatch.filing_event.v1"
accession: "0000912562-21-000044"
form_type: "8-K/A"
ticker: "ROCK"
cik: "0000912562"
company_name: "GIBRALTAR INDUSTRIES, INC."
filed_at: "2021-11-19T23:59:59+00:00"
generated_at: "2026-06-28T06:47:27.092088+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Gibraltar corrects Agtech historical EBITDA and margin growth in investor presentation

## Summary
- Agtech Adjusted EBITDA Margin growth corrected from ~880 bps to ~680 bps on slide 3 (page 76).
- Agtech 2020 EBITDA corrected from $19,085 to $20,352; margin corrected from 9.1% to 9.7% on slide 12.
- Corrected investor presentation filed as Exhibit 99.1 and posted on gibraltar1.com.
- No impact on previously reported consolidated financial statements.

## SEC filing metadata
- accession: 0000912562-21-000044
- form_type: 8-K/A
- ticker: ROCK
- cik: 0000912562
- company_name: GIBRALTAR INDUSTRIES, INC.
- filed_at: 2021-11-19T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/912562/000091256221000044/0000912562-21-000044-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/912562/000091256221000044/rock-20211119.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000912562-21-000044
- JSON: https://secwatch.observer/filing/0000912562-21-000044.json
- Plain text: https://secwatch.observer/filing/0000912562-21-000044.txt

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