MGRB offering history
Every offering-related filing in AFFILIATED MANAGERS GROUP, INC.’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 1,002 filings back to May 7, 2013.
| Date | Filing | What it means | |
|---|---|---|---|
| Dec 10, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Dec 8, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Dec 8, 2025 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Mar 7, 2025 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Feb 28, 2025 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Aug 16, 2024 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Aug 16, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 15, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 15, 2024 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Mar 15, 2024 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 14, 2024 | 424B3 → | UPDATE | Prospectus update — often a resale registration, not necessarily new capital |
| May 27, 2022 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 1, 2022 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Jul 9, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jul 8, 2021 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jul 8, 2021 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Sep 18, 2020 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Sep 18, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Sep 17, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 3, 2020 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Jun 3, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 2, 2020 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 27, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 22, 2019 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Mar 22, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Mar 21, 2019 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Mar 21, 2019 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Aug 17, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 8, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 7, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Jun 6, 2016 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
| Apr 19, 2016 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Feb 11, 2015 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Feb 11, 2015 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Feb 10, 2015 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Feb 7, 2014 | FWP → | MARKETING | Free-writing prospectus — offering being marketed |
| Feb 7, 2014 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Feb 6, 2014 | 424B2 → | EXECUTED | Prospectus supplement priced — shares or notes (large filers: often a bond deal) |
| Aug 6, 2013 | S-3ASR → | REGISTERED | Automatic shelf registration — effective immediately (large filers) |
| Aug 6, 2013 | 424B5 → | EXECUTED | Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm) |
Two honest limits. (1) A 424B takedown can price shares or notes — EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.
MGRB offering FAQ
When did MGRB last execute an offering?
Per SEC filings, AFFILIATED MANAGERS GROUP, INC.'s most recent priced offering document is a 424B5 filed 2025-12-10. Note a 424B takedown can price shares or notes (debt) — the linked document says which.
When did MGRB last announce or register an offering?
The most recent registration is a S-3ASR filed 2025-02-28. A registration is capacity to sell shares — not a sale.
Does an offering always mean dilution?
Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.
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