13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Surgical & Medical Instruments & ApparatusInflation hedgeYield
TNDM

TANDEM DIABETES CARE INC

291 institutions still hold TANDEM DIABETES CARE INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 875372203·Surgical & Medical Instruments & Apparatus·291 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 3.4%
vs prior quarter
13F value held
$1.1B
56.0% inst. owned
of float
Holders
291
-20 QoQ
filers reporting
Activity
+33 / −95
+942 added · −907 reduced
this quarter
Concentration
18.36%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

291 institutions reported TNDM in Q1 2026. BlackRock, Inc. leads at 18.4% of the visible book. -20 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$205M10.7M0.00%Q1 202602
UBS Group AG
CIK 0001610520
$139M7.2M0.02%Q1 202603
Sessa Capital IM, L.P.
CIK 0001595849
$91M4.7M1.65%Q1 202604
Vanguard Portfolio Management
CIK 0002100121
$77M4.0M0.00%Q1 202605
ArrowMark Colorado Holdings LLC
CIK 0001483859
$64M2.9M1.40%Q4 202506
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$58M3.0M0.00%Q1 202607
STATE STREET CORP
CIK 0000093751
$51M2.7M0.00%Q1 202608
CITADEL ADVISORS LLC
CIK 0001423053
$47M2.2M0.01%Q4 202509
JENNISON ASSOCIATES LLC
CIK 0000053417
$44M2.0M0.03%Q4 202510
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 0000938206
$44M2.3M0.32%Q1 202611
GOLDMAN SACHS GROUP INC
CIK 0000886982
$43M2.2M0.00%Q1 202612
Paradice Investment Management LLC
CIK 0001620275
$39M2.0M7.35%Q1 202613
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$36M1.9M0.03%Q1 202614
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$32M1.7M0.00%Q1 202615
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 0000884414
$29M1.5M0.12%Q1 202616
MORGAN STANLEY
CIK 0000895421
$26M1.4M0.00%Q1 202617
Freestone Grove Partners LP
CIK 0002007591
$26M1.3M0.18%Q1 202618
First Light Asset Management, LLC
CIK 0001600004
$25M1.3M2.26%Q1 202619
BAILLIE GIFFORD & CO
CIK 0001088875
$21M1.1M0.02%Q1 202620
TWO SIGMA ADVISERS, LP
CIK 0001478735
$21M938K0.04%Q4 2025
Page 1 of 15
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