Affiliated Managers Group, Inc. (AMG)
AMG moved a median of +0.07% 30 minutes after news, and -0.27% by the close. How AMG actually reacts to news — the realized, point-in-time move the market made, measured across 329 labeled events over the last three years with zero look-ahead.
AMG’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 47% | 324 |
| 30-min | +0.07% | 56% | 328 |
| 60-min | +0.07% | 52% | 328 |
| to close | -0.27% | 40% | 320 |
| Middle 50% of AMG reactions | -0.47% to +0.31% |
|---|---|
| Median reaction (30-min) | +0.07% |
| Measured reactions | 329 |
Half of all Affiliated Managers Group, Inc. news events land between -0.47% and +0.31% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How AMG reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 18 | +0.19% | 61% | +0.46% |
| Rating reiterations | 50 | +0.12% | 60% | +0.40% |
| Price-target raises | 15 | +0.18% | 60% | +0.51% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 3 further classes were observed with fewer than 10 measured events and are not published. See how AMG ranks against every other measured name →
That’s how AMG usually reacts — get an email when it moves on news →Email me when AMG moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to AMG's baseline. Nothing else.
Recent AMG events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form N-PX AFFILIATED MANAGERS GROU For: Jun 30 | SEC filing · Form N-PX | SEC EDGAR | -0.30% | -0.72% | |
| Form 13F-NT AFFILIATED MANAGERS GROU For: Jun 30 | SEC filing · Form 13F-NT | SEC EDGAR | +0.37% | +2.68% | |
| Form 10-Q AFFILIATED MANAGERS GROU For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.47% | — | |
| AMG Reports Financial and Operating Results for the Second Quarter and First Half of 2026 | Press release | GlobeNewswire | -1.17% | +0.48% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Jul 30 | SEC filing · Form 8-K | SEC EDGAR | -1.17% | +0.48% | |
| AMG to Announce Second Quarter and First Half Results on July 30, 2026 | Press release | GlobeNewswire | +1.69% | +0.59% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Jun 09 | SEC filing · Form 8-K | SEC EDGAR | -0.62% | -1.20% | |
| Form 8-K AFFILIATED MANAGERS GROU For: May 27 | SEC filing · Form 8-K | SEC EDGAR | +0.02% | -0.10% | |
| Form 13F-NT AFFILIATED MANAGERS GROU For: Mar 31 | SEC filing · Form 13F-NT | SEC EDGAR | -1.19% | -1.94% | |
| Form 10-Q AFFILIATED MANAGERS GROU For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -1.05% | +1.18% | |
| AMG Reports Financial and Operating Results for the First Quarter of 2026 | Press release | GlobeNewswire | +2.93% | -4.10% | |
| Form 8-K AFFILIATED MANAGERS GROU For: May 01 | SEC filing · Form 8-K | SEC EDGAR | +1.06% | -5.42% | |
| AMG to Announce First Quarter Results on May 1, 2026 | Press release | GlobeNewswire | -0.86% | -0.13% | |
| Form ARS AFFILIATED MANAGERS GROU For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.84% | +2.26% | |
| Form DEF 14A AFFILIATED MANAGERS GROU For: May 27 | SEC filing · Form DEF | SEC EDGAR | +0.84% | +2.26% | |
| Form DEFA14A AFFILIATED MANAGERS GROU | SEC filing · Form DEFA14A | SEC EDGAR | +0.84% | +2.26% | |
| AMG Appoints G. Staley Cates to its Board of Directors | Press release | GlobeNewswire | +0.79% | -0.65% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Feb 22 | SEC filing · Form 8-K | SEC EDGAR | -0.83% | -0.45% | |
| Form 10-K AFFILIATED MANAGERS GROU For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.81% | +2.10% | |
| Form 13F-NT AFFILIATED MANAGERS GROU For: Dec 31 | SEC filing · Form 13F-NT | SEC EDGAR | -0.73% | -2.69% | |
| AMG Announces Partnership with HighBrook Investors | Press release | GlobeNewswire | +4.87% | +6.77% | |
| AMG Expands Its Partnership with Garda Capital Partners with Increased Investment | Press release | GlobeNewswire | +4.87% | +6.77% | |
| AMG Reports Financial and Operating Results for the Fourth Quarter and Full Year 2025 | Press release | GlobeNewswire | +4.87% | +6.77% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Feb 10 | SEC filing · Form 8-K | SEC EDGAR | +4.87% | +6.77% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Feb 12 | SEC filing · Form 8-K | SEC EDGAR | +4.87% | +6.77% | |
| AMG to Announce Fourth-Quarter and Full-Year Results on February 12, 2026 | Press release | GlobeNewswire | -0.23% | -1.88% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Dec 08 | SEC filing · Form 8-K | SEC EDGAR | -0.30% | -1.62% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Dec 08 | SEC filing · Form 8-K | SEC EDGAR | +0.61% | +0.00% | |
| AMG to Present at the Goldman Sachs Financial Services Conference | Press release | GlobeNewswire | +2.17% | +1.94% | |
| AMG Announces Conversion Rate Adjustment for its 5.15% Junior Convertible Trust Preferred Securities Due 2037 | Press release | GlobeNewswire | +0.04% | +0.39% | |
| Form 10-Q AFFILIATED MANAGERS GROU For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | +0.45% | |
| AMG Reports Financial and Operating Results for the Third Quarter and Nine Months Ended 2025 | Press release | GlobeNewswire | +0.93% | +3.49% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Nov 03 | SEC filing · Form 8-K | SEC EDGAR | +0.93% | +3.49% | |
| AMG to Announce Third Quarter Results on November 3, 2025 | Press release | GlobeNewswire | +0.00% | +0.01% | |
| AMG and Brown Brothers Harriman Announce Strategic Collaboration | Press release | GlobeNewswire | +0.00% | -2.47% | |
| Form N-PX AFFILIATED MANAGERS GROU For: Jun 30 | SEC filing · Form N-PX | SEC EDGAR | -2.04% | -0.28% | |
| AMG Appoints Marcy Engel to its Board of Directors | Press release | GlobeNewswire | +0.00% | +0.63% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Aug 11 | SEC filing · Form 8-K | SEC EDGAR | -0.72% | -1.66% | |
| Form 13F-NT AFFILIATED MANAGERS GROU For: Jun 30 | SEC filing · Form 13F-NT | SEC EDGAR | +0.00% | +0.63% | |
| Form 10-Q AFFILIATED MANAGERS GROU For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.02% | +0.20% | |
| Comvest Partners’ Private Credit Business to be Acquired by Manulife | Press release | GlobeNewswire | +0.67% | -2.59% | |
| AMG Reports Financial and Operating Results for the Second Quarter and First Half of 2025 | Press release | GlobeNewswire | +1.43% | -0.29% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Jul 31 | SEC filing · Form 8-K | SEC EDGAR | +1.43% | -0.29% | |
| AMG and Montefiore Investment Announce Partnership | Press release | GlobeNewswire | +0.00% | -1.73% | |
| AMG to Announce Second Quarter Results on July 31, 2025 | Press release | GlobeNewswire | +0.00% | -1.73% | |
| Form 8-K AFFILIATED MANAGERS GROU For: Jun 03 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -0.26% | |
| AMG Names Thomas M. Wojcik as President and Chief Operating Officer | Press release | GlobeNewswire | +0.41% | +1.02% | |
| Form 8-K AFFILIATED MANAGERS GROU For: May 22 | SEC filing · Form 8-K | SEC EDGAR | +0.20% | +0.45% | |
| Form 13F-NT AFFILIATED MANAGERS GROU For: Mar 31 | SEC filing · Form 13F-NT | SEC EDGAR | -0.07% | -0.50% | |
| AMG Reports Financial and Operating Results for the First Quarter of 2025 | Press release | GlobeNewswire | +0.08% | -2.59% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the AMG section they belong to.
Where else AMG is measured.
AMG earnings → · Analyst actions → · SEC filings →
Other Financial Services names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| BLUE HILLS BANCORP (BHBK) | 332 | 0.00% | 44% |
| Western Union Company (The) (WU) | 330 | +0.06% | 52% |
| Goosehead Insurance, Inc. - Class A (GSHD) | 329 | +0.03% | 51% |
| Macquarie Global Infrastructure Total Return Fund Inc. (MGU) | 329 | -0.03% | 45% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Financial Services names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Affiliated Managers Group, Inc.'s median reaction calculated?
Every labeled AMG news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 329 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 56% of AMG's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does AMG's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.