Nierenberg Investment Management Company, LLC
Position in TNDM — Tandem Diabetes Care Inc
CIK 1282683
Camas, WA
Position in TNDM
as of Mar 31, 2026
· filed May 13, 2026
Position Value
$1,524,206
+$544,888 QoQ
Shares Held
79,510
+78.5% QoQ
Ownership
0.116%
of shares outstanding
% of Portfolio
1.04%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2025
2 quarters on record
Voting authority
Sole 0%
Shared 100%
None 0%
Common Shares in TNDM Over Time
Shares Held
Position Value (USD)
Position in Medical Devices
Healthcare · as of Mar 31, 2026Nierenberg Investment Management Company, LLC holds $1,524,206 across 1 Medical Devices name. TNDM ranks #1 (100.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | TNDM |
Tandem Diabetes Care Inc
This page
|
79,510 | $1,524,206 |
All Filings in TNDM
Export CSV
2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $1,524,206 | 79,510 | Shares | Sole | 2026-05-13 | |
| 2025-12-31 | $979,318 | 44,555 | Shares | Sole | 2026-02-13 | |
| No filing history on record for this holder in this stock. | ||||||