---
schema_version: "secwatch.filing_event.v1"
accession: "0001514416-21-000273"
form_type: "8-K"
ticker: "BAND"
cik: "0001514416"
company_name: "Bandwidth Inc."
filed_at: "2021-10-06T23:59:59+00:00"
generated_at: "2026-06-28T22:34:31.944932+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Bandwidth discloses DDoS attack starting Sept 25; expects $0.5M-$1.5M Q3 revenue hit

## Summary
- DDoS attack began Sept 25, 2021; network largely stable since evening Sept 29 but with intermittent disruptions.
- Estimated revenue impact of $0.5M to $1.5M for Q3 2021 due to lost transaction volume and customer credits.
- Mitigation efforts with leading cybersecurity firms are proving successful; collaboration with customers and partners.
- Status updates available at https://status.bandwidth.com; investigation still in early stages.

## SEC filing metadata
- accession: 0001514416-21-000273
- form_type: 8-K
- ticker: BAND
- cik: 0001514416
- company_name: Bandwidth Inc.
- filed_at: 2021-10-06T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1514416/000151441621000273/0001514416-21-000273-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1514416/000151441621000273/band-20211005.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001514416-21-000273
- JSON: https://secwatch.observer/filing/0001514416-21-000273.json
- Plain text: https://secwatch.observer/filing/0001514416-21-000273.txt

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