Who owns MBB (MBB)

How the tape is positioned

286 tracked funds added or opened MBB while 151 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.

A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.

Conviction spread

MBB’s largest tracked holder by dollar value, BANK OF AMERICA CORP /DE/, sizes it at 0.5% of its own reported 13F book, while the median holder sizes it at 0.7% of theirs — a 0.3pp gap the other way — the median holder sizes MBB more heavily than its largest holder by dollar value does.

Book-share is each fund’s reported value in MBB divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.

Institutional & insider positioning

Between 2025-Q4 and 2026-Q1, across 1016 tracked filers holding MBB, 614 increased or opened the position and 403 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.

This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.

Ownership over time

Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.