L3VLUP
Quarter end
31 Mar 2026
the date the book describes
Filed
18 May 2026
latest of these filings; the earliest 8 May 2026
Managers listing it
38
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 22 listed it in both
Shares listed
185,997,591
combined, among listed positions
Reported value
$8.3bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 29 buyers (opened or added shares) and 15 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +48,605,912.

Managers listing MDLN in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

38 of 38 holders

ActionFiling
Fidelity (FMR LLC)36,556,201$1.6bn0.09%Added+10,201,98715 May 2026 (the filing on sec.gov)
Capital Research Global Investors23,161,670$1.0bn0.16%Added+8,377,46713 May 2026 (the filing on sec.gov)
Invesco Ltd20,963,615$933m0.09%Added+18,434,10612 May 2026 (the filing on sec.gov)
Lone Pine Capital LLC11,789,156$525m4.18%Added+72,45915 May 2026 (the filing on sec.gov)
MFS Investment Management11,569,316$518m0.17%Added+1,342,08914 May 2026 (the filing on sec.gov)
Viking Global Investors LP11,433,992$509m1.42%Added+4,474,83515 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd11,451,861$507m0.24%Added+887,24018 May 2026 (the filing on sec.gov)
Baillie Gifford & Co9,975,775$444m0.45%Trimmed-434,5968 May 2026 (the filing on sec.gov)
Durable Capital Partners LP7,265,853$323m3.33%Added+365,85315 May 2026 (the filing on sec.gov)
Artisan Partners LP6,629,443$295m0.47%Added+2,037,85513 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc5,610,842$250munder 0.1%Trimmed-1,714,26215 May 2026 (the filing on sec.gov)
Egerton Capital UK LLP4,365,802$194m2.16%Newnew13 May 2026 (the filing on sec.gov)
Capital World Investors4,311,124$192munder 0.1%Added+919,54713 May 2026 (the filing on sec.gov)
Point72 Asset Management LP3,304,305$147m0.19%Added+2,413,20515 May 2026 (the filing on sec.gov)
Jane Street Group LLC1,996,552$89munder 0.1%Added+1,142,56412 May 2026 (the filing on sec.gov)
Millennium Management LLC1,955,949$87munder 0.1%Added+1,771,40415 May 2026 (the filing on sec.gov)
Citadel Advisors LLC1,593,358$71munder 0.1%Trimmed-4,412,98115 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC1,544,538$69m0.48%Trimmed-400,51215 May 2026 (the filing on sec.gov)
Soros Fund Management LLC1,286,434$57m0.63%Trimmed-293,56615 May 2026 (the filing on sec.gov)
Woodline Partners LP1,213,076$54m0.20%Added+500,17515 May 2026 (the filing on sec.gov)
Two Sigma Investments LP1,138,548$51munder 0.1%Added+1,132,04815 May 2026 (the filing on sec.gov)
Freestone Grove Partners LP1,089,014$48m0.34%Added+582,51415 May 2026 (the filing on sec.gov)
Verition Fund Management LLC855,570$38m0.25%Added+105,57015 May 2026 (the filing on sec.gov)
Holocene Advisors LP832,316$37m0.09%Added+253,70015 May 2026 (the filing on sec.gov)
Maverick Capital Ltd796,077$35m0.41%Held015 May 2026 (the filing on sec.gov)
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Largest increases and reductions, by shares

Q4 2025 to Q1 2026, 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.

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.
28 in Q4 2025 to 21 in Q2 2026

Tracked managers listing it, at least.

0102030Q4 2025Q1 2026Q2 2026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MDLN by quarter
QuarterHoldersReported valueBuyersSellers
Q4 202528$5.5bn390
Q1 202628$7.9bn2915
Q2 202621$9.1bn2223

Compare with…

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

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

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 MDLN, latest filings →Back to the 13F Explorer →