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.
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
- 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
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."
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.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G 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 |