ArrowMark Colorado Holdings LLC - 31 Dec 2025 SCHEDULE 13G/A Report for TANDEM DIABETES CARE INC Common Stock, par value $0.001 per share (TNDM)

Filing Manager
ArrowMark Colorado Holdings LLC
Reporting Manager
ArrowMark Colorado Holdings, LLC
Security
TANDEM DIABETES CARE INC Common Stock, par value $0.001 per share
Symbol
TNDM
Shares outstanding
67,833,122 shares
Disclosed Ownership
2,889,691 shares
Ownership
4.3%
Form type
SCHEDULE 13G/A
Filing time
17 Feb 2026, 16:37:26 UTC
Date of event
31 Dec 2025
Previous filing
13 Nov 2025
SEC
View on sec.gov

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Quoteable Key Fact

"ArrowMark Colorado Holdings LLC disclosed 4.3% ownership in TANDEM DIABETES CARE INC Common Stock, par value $0.001 per share (TNDM) on 31 Dec 2025."

Quick Takeaways

  • ArrowMark Colorado Holdings LLC filed SCHEDULE 13G/A for TANDEM DIABETES CARE INC Common Stock, par value $0.001 per share (TNDM).
  • Disclosed ownership: 4.3%.
  • Date of event: 31 Dec 2025.

What Changed

  • Previous schedule filing date: 13 Nov 2025.
  • Current filing was accepted on 17 Feb 2026, 16:37.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (1)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
ArrowMark Colorado Holdings, LLC 4.3% 2,889,691 2,889,691 0 Richard Grove Richard Grove | Chief Compliance Officer

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