---
schema_version: "secwatch.filing_event.v1"
accession: "0001438133-25-000237"
form_type: "8-K"
ticker: "TNDM"
cik: "0001438133"
company_name: "TANDEM DIABETES CARE INC"
filed_at: "2025-12-30T23:59:59+00:00"
generated_at: "2026-05-16T11:58:00.283848+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# Tandem Diabetes amends bylaws with updated advance notice, proxy card, voting rules

## Summary
- Board adopted Amended and Restated Bylaws on Dec 26, 2025 as part of periodic governance review.
- Advance notice provisions updated: stockholder nominees must satisfy Rule 14a-19 requirements; non-compliant nominees disregarded.
- White proxy card reserved exclusively for Board; other solicitations must use non-white cards.
- Voting standard (plurality for contested, majority for uncontested) determined 10 days before notice mailing.
- Board given express authority to cancel, reschedule, or postpone stockholder meetings.

## SEC filing metadata
- accession: 0001438133-25-000237
- form_type: 8-K
- ticker: TNDM
- cik: 0001438133
- company_name: TANDEM DIABETES CARE INC
- filed_at: 2025-12-30T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1438133/000143813325000237/0001438133-25-000237-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1438133/000143813325000237/tndm-20251226.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001438133-25-000237
- JSON: https://secwatch.observer/filing/0001438133-25-000237.json
- Plain text: https://secwatch.observer/filing/0001438133-25-000237.txt

## Source-grounded claims
- claim_id: ddd2f89e6ccba8f45cf653070764f3524c969296
  claim: TANDEM DIABETES CARE INC: Amended and Restated Bylaws effective December 26, 2025, updating advance notice provisions, meeting cancellation authority, proxy card color rule, indemnification, notice provisions, voting standards, stockholder list requirement, and certain technical changes (effective 2025-12-26).
  evidence_excerpt: On December 26, 2025, in connection with a standard periodic review of the governance documents of Tandem Diabetes Care, Inc. (the “Company”), the Company’s board of directors (the “Board”) adopted Amended and Restated Bylaws of the Company (the “Amended and Restated Bylaws”), which became effective immediately and amended and restated the Company’s prior bylaws (the “Prior Bylaws”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1438133/000143813325000237/0001438133-25-000237-index.htm

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