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Which funds own TNDM

Tandem Diabetes in the Q2 2026 filings. At least 1 of the 91 current managers on file reported a position, worth $28m between them. It is among the largest positions of fewer than a fifth of the current managers on file. Buying and selling roughly cancelled this quarter, which is what a name looks like when the argument is still live.

Managers holding: 1; at least, of 91 current
Combined value: $28m; as reported
Opened: 0; new this quarter
Added to: 1; already held
Trimmed or sold out: 2; 2 sold out entirely

Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.

Managers reporting a position

Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.

Manager	Value	Weight	Shares	Change on the quarter	Action
Freestone Grove Partners LP Multi-strategy · $15.6bn book	$28m	0.2%	1,866,134	+$2.6m+535,392	Added

Sold out of this quarter

Valued at what the position was worth in the previous filing, because by this one it is gone.

Marshall Wace LLP · Quantitative$28m held before
Baillie Gifford & Co · Long-only$21m held before

Ownership through time

At least 6 of the 95 managers whose filings are on file listed TNDM in Q2 2026, against 1 in Q1 2018. 1 manager more than in Q1 2026: 1 started a position; 1 listed it again; 1 sold out, by its own filing.

Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.

Managers on file listing it

Their combined reported value

Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.

Started in Q2 2026

Woodline Partners LP$20m

Largest increases, by shares

Woodline Partners LPnew: 1,307,439 shares+$20m
Freestone Grove Partners LP1,330,742 to 1,866,134 shares+$8.1m
ExodusPoint Capital Management LP632,899 to 691,789 shares+$889k

Largest decreases, by shares

Holocene Advisors LP477,359 to 267,860 shares-$3.2m
PDT Partners LLC93,805 to 17,844 shares-$1.1m

Left it

Baillie Gifford & Cowas $21m

Manager	First listed	Largest	Q2 2026
Freestone Grove Partners LP	Q4 2024	$32m	$28m
Woodline Partners LP	Q2 2026	$20m	$20m
Verition Fund Management LLC	Q1 2019	$11m	$11m
ExodusPoint Capital Management LP	Q3 2019	$12m	$10m
Holocene Advisors LP	Q1 2024	$9.2m	$4.0m
PDT Partners LLC	Q2 2020	$7.0m	$269k
Fidelity (FMR LLC)	Q1 2020	$846m	last listed Q4 2022
Wellington Management Group LLP	Q3 2019	$617m	last listed Q4 2020
Capital World Investors	Q2 2020	$516m	last listed Q2 2025
Invesco Ltd	Q1 2020	$292m	last listed Q1 2022
Marshall Wace LLP	Q4 2022	$110m	last listed Q4 2024
Janus Henderson Group Ltd	Q2 2021	$101m	last listed Q3 2024
Renaissance Technologies LLC	Q4 2018	$83m	last listed Q3 2020
AllianceBernstein LP	Q2 2022	$80m	last listed Q2 2022
Millennium Management LLC	Q1 2019	$75m	last listed Q3 2020
Point72 Asset Management LP	Q2 2018	$66m	last listed Q4 2024

What TNDM is worth

Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.

Build the comp set around TNDM →

How much of the picture this is

A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.

What to do with a name the funds are buying

Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.

Comps ExplorerValue it against the peers it trades beside Every managerRead any of these books in full Deal tapeWhat buyers paid for whole companies, not slices Hedge fund interviewsHow the room runs, and the stock pitch it wants

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The holdings, every quarter, and the week between

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