IGM Biosciences, Inc. (IGMS)
IGMS moved a median of -0.23% 30 minutes after news, and -0.44% by the close. How IGMS actually reacts to news — the realized, point-in-time move the market made, measured across 276 labeled events over the last three years with zero look-ahead.
IGMS’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 46% | 238 |
| 30-min | -0.23% | 43% | 239 |
| 60-min | -0.56% | 40% | 239 |
| to close | -0.44% | 41% | 239 |
| Middle 50% of IGMS reactions | -1.88% to +1.69% |
|---|---|
| Median reaction (30-min) | -0.23% |
| Measured reactions | 276 |
Half of all IGM Biosciences, Inc. news events land between -1.88% and +1.69% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How IGMS reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst downgrades | 28 | +0.78% | 54% | +6.09% |
| Rating reiterations | 32 | -1.19% | 28% | +0.43% |
| Price-target cuts | 11 | +0.59% | 64% | +2.69% |
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 IGMS ranks against every other measured name →
That’s how IGMS usually reacts — get an email when it moves on news →Email me when IGMS moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to IGMS's baseline. Nothing else.
Recent IGMS events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 15-12G IGM Biosciences, Inc. | SEC filing · Form 15-12G | SEC EDGAR | — | — | |
| Form EFFECT IGM Biosciences, Inc. | SEC filing · Form EFFECT | SEC EDGAR | — | — | |
| Form 8-K IGM Biosciences, Inc. For: Aug 14 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form POS AM IGM Biosciences, Inc. | SEC filing · Form POS | SEC EDGAR | — | — | |
| Form S-8 POS IGM Biosciences, Inc. | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Form 10-Q IGM Biosciences, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.78% | +1.55% | |
| Form 8-K IGM Biosciences, Inc. For: Jul 01 | SEC filing · Form 8-K | SEC EDGAR | +1.60% | +0.00% | |
| IGM Biosciences Enters into Agreement to Be Acquired by Concentra Biosciences for $1.247 in Cash per Share Plus a Contingent Value Right | Press release | GlobeNewswire | +1.60% | +0.00% | |
| IGMS Stock Alert: Halper Sadeh LLC is Investigating Whether the Sale of IGM Biosciences, Inc. is Fair to Shareholders | Press release | Business Wire | +0.39% | -0.77% | |
| Form 8-K IGM Biosciences, Inc. For: Jun 06 | SEC filing · Form 8-K | SEC EDGAR | +0.80% | -3.20% | |
| Form 8-K IGM Biosciences, Inc. For: May 23 | SEC filing · Form 8-K | SEC EDGAR | -3.08% | -2.31% | |
| Form 10-Q IGM Biosciences, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.91% | +3.64% | |
| Form 8-K IGM Biosciences, Inc. For: May 05 | SEC filing · Form 8-K | SEC EDGAR | +4.02% | +0.89% | |
| Form 10-K/A IGM Biosciences, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.00% | +5.72% | |
| Form 10-K IGM Biosciences, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.37% | -2.94% | |
| Form 8-K/A IGM Biosciences, Inc. For: Jan 07 | SEC filing · Form 8-K | SEC EDGAR | -0.37% | -2.94% | |
| Form S-8 IGM Biosciences, Inc. | SEC filing · Form S-8 | SEC EDGAR | -0.37% | -2.94% | |
| Form 8-K IGM Biosciences, Inc. For: Jan 07 | SEC filing · Form 8-K | SEC EDGAR | -1.41% | -14.66% | |
| IGM Biosciences Provides Strategic Update on Autoimmunity Pipeline Programs | Press release | GlobeNewswire | -0.47% | +6.09% | |
| Form 10-Q IGM Biosciences, Inc. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.16% | -7.13% | |
| Form 8-K IGM Biosciences, Inc. For: Nov 08 | SEC filing · Form 8-K | SEC EDGAR | -0.16% | -7.13% | |
| Form 8-K/A IGM Biosciences, Inc. For: Sep 27 | SEC filing · Form 8-K | SEC EDGAR | -0.16% | -7.13% | |
| IGM Biosciences Announces Third Quarter 2024 Financial Results and Provides Corporate Update | Press release | GlobeNewswire | -0.16% | -7.13% | |
| IGM Biosciences to Present at Three Upcoming Investor Conferences | Press release | GlobeNewswire | -1.17% | -3.33% | |
| Form 8-K IGM Biosciences, Inc. For: Sep 27 | SEC filing · Form 8-K | SEC EDGAR | -0.07% | +2.12% | |
| IGM Biosciences Announces Strategic Pivot to Focus Exclusively on Autoimmunity | Press release | GlobeNewswire | +13.56% | +26.86% | |
| IGM Biosciences to Present at the Stifel 2024 Virtual Immunology and Inflammation Summit | Press release | GlobeNewswire | -2.84% | +4.08% | |
| Form 10-Q IGM Biosciences, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | -1.13% | |
| Form 8-K IGM Biosciences, Inc. For: Aug 14 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -1.13% | |
| IGM Biosciences Announces Second Quarter 2024 Financial Results and Provides Corporate Update | Press release | GlobeNewswire | +0.00% | -1.13% | |
| Form 8-K IGM Biosciences, Inc. For: Jul 05 | SEC filing · Form 8-K | SEC EDGAR | +0.47% | +4.36% | |
| Form 8-K IGM Biosciences, Inc. For: Jun 11 | SEC filing · Form 8-K | SEC EDGAR | -0.63% | -8.31% | |
| IGM Biosciences to Present at the Jefferies Healthcare Conference | Press release | GlobeNewswire | +0.44% | -0.44% | |
| Form 10-Q IGM Biosciences, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.67% | +13.45% | |
| Form 8-K IGM Biosciences, Inc. For: May 08 | SEC filing · Form 8-K | SEC EDGAR | -0.67% | +13.45% | |
| IGM Biosciences Announces First Quarter 2024 Financial Results and Provides Corporate Update | Press release | GlobeNewswire | -0.67% | +13.45% | |
| IGM Biosciences to Present at the 2024 RBCCM Global Healthcare Conference | Press release | GlobeNewswire | +0.00% | -0.90% | |
| Form ARS IGM Biosciences, Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -0.42% | +2.54% | |
| Form DEF 14A IGM Biosciences, Inc. For: Apr 26 | SEC filing · Form DEF | SEC EDGAR | -0.42% | +2.54% | |
| Form DEFA14A IGM Biosciences, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -0.42% | +2.54% | |
| Form 8-K IGM Biosciences, Inc. For: Apr 17 | SEC filing · Form 8-K | SEC EDGAR | -2.08% | -13.23% | |
| IGM Biosciences Announces Refocusing of Sanofi Collaboration | Press release | GlobeNewswire | -2.08% | -13.23% | |
| Form PRE 14A IGM Biosciences, Inc. For: Apr 15 | SEC filing · Form PRE | SEC EDGAR | +0.11% | +2.95% | |
| IGM Biosciences to Present at the Stifel 2024 Virtual Targeted Oncology Forum | Press release | GlobeNewswire | -3.78% | -6.41% | |
| Form 10-K IGM Biosciences, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +1.57% | +0.97% | |
| Form 8-K IGM Biosciences, Inc. For: Mar 07 | SEC filing · Form 8-K | SEC EDGAR | +1.57% | +0.97% | |
| Form S-8 IGM Biosciences, Inc. | SEC filing · Form S-8 | SEC EDGAR | +1.57% | +0.97% | |
| IGM Biosciences Announces Fourth Quarter and Full Year 2023 Financial Results and Provides Corporate Update | Press release | GlobeNewswire | +1.57% | +0.97% | |
| IGM Biosciences to Present at the Guggenheim Healthcare Talks 6th Annual Biotechnology Conference | Press release | GlobeNewswire | +0.30% | +7.66% | |
| Form 8-K IGM Biosciences, Inc. For: Jan 08 | SEC filing · Form 8-K | SEC EDGAR | -3.50% | +9.26% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the IGMS section they belong to.
Where else IGMS is measured.
IGMS earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is IGM Biosciences, Inc.'s median reaction calculated?
Every labeled IGMS 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 276 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. 43% of IGMS'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 IGMS'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.