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TNDM in the 13F filings

Tandem Diabetes Care Inc · CUSIP 875372203

Sector · Medical devices and instrumentsTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Surgical, medical and electromedical devices
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
30 Sep 2023
the date the book describes
Filed
14 Nov 2023
latest of these filings; the earliest 13 Nov 2023
Managers listing it
6
at least, of 95 tracked, among listed positions
Comparable managers
93
filed both Q2 2023 and Q3 2023; 6 listed it in both
Shares listed
12,338,205
combined, among listed positions
Reported value
$256m
combined, at the quarter end

Managers listing TNDM in Q3 2023

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2023, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

6 of 6 holders

ActionFiling
Capital World Investors6,545,338$136munder 0.1%Added+59,31113 Nov 2023 (the filing on sec.gov)
Janus Henderson Group Ltd2,671,231$55munder 0.1%Added+586,83214 Nov 2023 (the filing on sec.gov)
Voloridge Investment Management LLC1,047,963$22m0.11%Added+170,93214 Nov 2023 (the filing on sec.gov)
Two Sigma Advisers LP1,030,383$21m0.05%Trimmed-183,10014 Nov 2023 (the filing on sec.gov)
Two Sigma Investments LP780,534$16munder 0.1%Trimmed-427,27114 Nov 2023 (the filing on sec.gov)
Baillie Gifford & Co262,756$5.5munder 0.1%Held013 Nov 2023 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2023 to Q3 2023, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (0)

No new position among listed positions.

Exited (0)

No exit shown by a manager’s own filing.

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
7 in Q3 2024 to 6 in Q2 2026

Tracked managers listing it, at least.

05101520201820192020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
TNDM by quarter
QuarterHoldersReported valueBuyersSellers
Q1 20181$5.0mn.a.n.a.
Q2 20182$50mn.a.n.a.
Q3 20185$172mn.a.n.a.
Q4 20186$179mn.a.n.a.
Q1 20199$226mn.a.n.a.
Q2 201910$206mn.a.n.a.
Q3 20197$259mn.a.n.a.
Q4 20194$232mn.a.n.a.
Q1 20209$944mn.a.n.a.
Q2 202010$1.7bnn.a.n.a.
Q3 202013$1.7bnn.a.n.a.
Q4 20206$1.1bnn.a.n.a.
Q1 20219$943mn.a.n.a.
Q2 202110$1.1bnn.a.n.a.
Q3 202113$1.5bnn.a.n.a.
Q4 202116$1.9bnn.a.n.a.
Q1 202213$1.4bnn.a.n.a.
Q2 202210$740mn.a.n.a.
Q3 20228$748mn.a.n.a.
Q4 202211$836mn.a.n.a.
Q1 202310$411mn.a.n.a.
Q2 20239$306mn.a.n.a.
Q3 20236$256mn.a.n.a.
Q4 20238$388m26
Q1 20249$426m45
Q2 20247$332m33
Q3 20247$295m25
Q4 202410$188m72
Q1 20254$44m12
Q2 20257$74m51
Q3 20256$64m41
Q4 20255$81m1319
Q1 20265$69m1615
Q2 20266$73m1812

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

TNDM and LLY →TNDM and JNJ →TNDM and VRTX →Choose a stock to compare with TNDM →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own TNDM, latest filings →Back to the 13F Explorer →