Company · Ownership research

TANDEM DIABETES CARE INC TNDM

CIK 0001438133 · CUSIP 875372203

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 875372203 (TNDM), not CUSIP 875372903 (TNDM), CUSIP 875372953 (TNDM), and does not merge CUSIPs.

This page lists the top 20 of 272 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$202.65M 10,871,558 shares	0.00%	-157.15K(-1.40%)Reduced	SEC filing ↗ Aug 12, 2025	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$137.37M 7,369,830 shares	0.00%	+77.66K(+1.10%)Added	SEC filing ↗ Aug 11, 2025	▾
03	Sessa Capital IM, L.P. CIK 1595849 · View history	$93.20M 5,000,000 shares	2.84%	+533.69K(+11.90%)Added	SEC filing ↗ Aug 13, 2025	▾
04	GW&K Investment Management, LLC CIK 1082917 · View history	$53.87M 2,890,130 shares	0.48%	+26.14K(+0.90%)Added	SEC filing ↗ Aug 11, 2025	▾
05	ArrowMark Colorado Holdings LLC CIK 1483859 · View history	$50.32M 2,699,549 shares	0.91%	-16.78K(-0.60%)Reduced	SEC filing ↗ Aug 14, 2025	▾
06	STATE STREET CORP CIK 93751 · View history	$49.32M 2,645,889 shares	0.00%	-41.85K(-1.60%)Reduced	SEC filing ↗ Aug 14, 2025	▾
07	Hood River Capital Management LLC CIK 1578177 · View history	$47.81M 2,564,978 shares	0.67%	+252.93K(+10.90%)Added	SEC filing ↗ Aug 14, 2025	▾
08	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$35.16M 1,886,475 shares	0.01%	+1.17M(+164.70%)Added	SEC filing ↗ Aug 14, 2025	▾
09	Paradice Investment Management LLC CIK 1620275 · View history	$32.94M 1,767,179 shares	6.69%	+117.27K(+7.10%)Added	SEC filing ↗ Aug 13, 2025	▾
10	Stephens Investment Management Group LLC CIK 1314440 · View history	$32.39M 1,737,769 shares	0.43%	+30.85K(+1.80%)Added	SEC filing ↗ Jul 30, 2025	▾
11	JENNISON ASSOCIATES LLC CIK 53417 · View history	$30.92M 1,658,942 shares	0.02%	+181.83K(+12.30%)Added	SEC filing ↗ Aug 1, 2025	▾
12	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$29.95M 1,606,336 shares	0.00%	+49.13K(+3.20%)Added	SEC filing ↗ Aug 8, 2025	▾
13	Champlain Investment Partners, LLC CIK 1315478 · View history	$27.12M 1,455,123 shares	0.19%	+86.23K(+6.30%)Added	SEC filing ↗ Aug 12, 2025	▾
14	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$26.68M 1,431,307 shares	0.10%	-40.26K(-2.70%)Reduced	SEC filing ↗ Aug 14, 2025	▾
15	UBS Group AG CIK 1610520 · View history	$25.80M 1,383,944 shares	0.01%	+548.25K(+65.60%)Added	SEC filing ↗ Aug 14, 2025	▾
16	Ophir Asset Management Pty Ltd CIK 1844640 · View history	$24.42M 1,464,956 shares	3.88%	+1.46MNew	SEC filing ↗ Aug 14, 2025	▾
17	MORGAN STANLEY CIK 895421 · View history	$23.59M 1,265,534 shares	0.00%	+334.56K(+35.90%)Added	SEC filing ↗ Aug 14, 2025	▾
18	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$22.98M 1,232,727 shares	0.04%	+591.28K(+92.20%)Added	SEC filing ↗ Aug 14, 2025	▾
19	BAILLIE GIFFORD & CO CIK 1088875 · View history	$20.98M 1,125,728 shares	0.02%	+393.15K(+53.70%)Added	SEC filing ↗ Aug 6, 2025	▾
20	BROWN ADVISORY INC CIK 1345929 · View history	$19.70M 1,057,115 shares	0.03%	+131.81K(+14.20%)Added	SEC filing ↗ Aug 13, 2025	▾

Showing 20 / 272 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

272

Cancelled or null records excluded

Disclosed shares

80,979,487

Not deduplicated across managers

Disclosed value

$1.51B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

TANDEM DIABETES CARE INC · Q2 2025

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.