Annexon, Inc. - common stock (ANNX)
ANNX moved a median of +0.21% 30 minutes after news, and 0.00% by the close. How ANNX actually reacts to news — the realized, point-in-time move the market made, measured across 367 labeled events over the last three years with zero look-ahead.
ANNX’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.18% | 52% | 367 |
| 30-min | +0.21% | 54% | 367 |
| 60-min | 0.00% | 49% | 367 |
| to close | 0.00% | 46% | 363 |
| Middle 50% of ANNX reactions | -1.37% to +1.75% |
|---|---|
| Median reaction (30-min) | +0.21% |
| Measured reactions | 367 |
Half of all Annexon, Inc. - common stock news events land between -1.37% and +1.75% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ANNX reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 13 | -0.92% | 39% | -1.40% |
| Coverage initiations | 12 | -0.98% | 42% | -3.20% |
| Rating reiterations | 60 | -0.04% | 48% | -0.80% |
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. 2 further classes were observed with fewer than 10 measured events and are not published. See how ANNX ranks against every other measured name →
That’s how ANNX usually reacts — get an email when it moves on news →Email me when ANNX moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ANNX's baseline. Nothing else.
Recent ANNX events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Annexon Reports Inducement Grants to New Employees Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | — | — | |
| Annexon to Present Patient Baseline Characteristics from Vonaprument Phase 3 ARCHER II Pivotal Trial for Geographic Atrophy at The Retina Society 59th Annual Scientific Meeting | Press release | GlobeNewswire | -0.52% | -1.30% | |
| Annexon Reports Inducement Grants to New Employees Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +0.25% | +4.25% | |
| Annexon to Participate in Upcoming September Investor Conferences | Press release | GlobeNewswire | +2.24% | +0.41% | |
| Annexon Reports Inducement Grants to New Employees Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +3.08% | +4.97% | |
| Annexon Expands Vonaprument Phase 3 Program in Geographic Atrophy with Addition of Month 24 Dual Primary Endpoint Complementing Month 15 Primary Endpoint and Launch of Open-Label Extension Study | Press release | GlobeNewswire | +1.19% | +5.34% | |
| Annexon Reports Second Quarter 2026 Financial Results, Business Updates and Key Anticipated Milestones | Press release | GlobeNewswire | +1.19% | +5.34% | |
| Form 10-Q Annexon, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.28% | -1.87% | |
| Form 8-K Annexon, Inc. For: Aug 12 | SEC filing · Form 8-K | SEC EDGAR | +1.19% | +5.34% | |
| Annexon Reports First U.S. and European Patient Cohort of GBS FORWARD Study Demonstrated Rapid, Positive Clinical Responses in All Tanruprubart Treated Patients Within One Week | Press release | GlobeNewswire | +0.56% | +4.28% | |
| Form 8-K Annexon, Inc. For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | +0.56% | +4.28% | |
| Annexon Secures Strategic Credit Facility for up to $200 Million from Oxford Finance | Press release | GlobeNewswire | -1.29% | -5.12% | |
| Form 8-K Annexon, Inc. For: Jul 30 | SEC filing · Form 8-K | SEC EDGAR | -1.29% | -5.12% | |
| Annexon Reports Inducement Grants to New Employees Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | -0.61% | +0.87% | |
| Annexon to Present Phase 2 ARCHER Baseline Characteristics Associated with Confirmed Best Corrected Visual Acuity 15-Letter Loss in Patients with Geographic Atrophy at ASRS 2026 | Press release | GlobeNewswire | -4.08% | +10.36% | |
| Annexon Reports Inducement Grants to New Employees Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +0.90% | +8.81% | |
| Form 8-K Annexon, Inc. For: Jun 11 | SEC filing · Form 8-K | SEC EDGAR | +1.46% | -3.33% | |
| Annexon to Participate in Upcoming June Investor Conferences | Press release | GlobeNewswire | -1.62% | -2.88% | |
| Annexon Reports Inducement Grants to New Employees Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | -1.41% | -0.81% | |
| 110 Years. 110 Stories. 110 Reasons to Raise Awareness for GBS | Press release | GlobeNewswire | -0.51% | -3.24% | |
| Annexon Reports First Quarter 2026 Financial Results, Portfolio Progress and Key Anticipated Milestones | Press release | GlobeNewswire | +2.79% | -0.70% | |
| Form 10-Q Annexon, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +2.79% | -0.70% | |
| Form 8-K Annexon, Inc. For: May 07 | SEC filing · Form 8-K | SEC EDGAR | +2.79% | -0.70% | |
| Annexon to Present at the Bank of America Securities Health Care Conference 2026 | Press release | GlobeNewswire | -1.21% | -1.72% | |
| Form ARS Annexon, Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +3.32% | -0.50% | |
| Form DEF 14A Annexon, Inc. For: Jun 11 | SEC filing · Form DEF | SEC EDGAR | +3.32% | -0.50% | |
| Form DEFA14A Annexon, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | +3.32% | -0.50% | |
| Form PRE 14A Annexon, Inc. For: Jun 11 | SEC filing · Form PRE | SEC EDGAR | +0.62% | +2.03% | |
| Annexon to Present at the 25th Annual Needham Virtual Healthcare Conference | Press release | GlobeNewswire | +0.83% | +2.50% | |
| Form S-3ASR Annexon, Inc. | SEC filing · Form S-3ASR | SEC EDGAR | +6.03% | -1.77% | |
| Form S-8 Annexon, Inc. | SEC filing · Form S-8 | SEC EDGAR | +6.03% | -1.77% | |
| Annexon Reports Fourth Quarter and Year-End 2025 Financial Results, Portfolio Progress and Key Anticipated Milestones | Press release | GlobeNewswire | +6.03% | -1.77% | |
| Form 10-K Annexon, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +6.03% | -1.77% | |
| Form 8-K Annexon, Inc. For: Mar 30 | SEC filing · Form 8-K | SEC EDGAR | +6.03% | -1.77% | |
| Annexon Reports Inducement Grant to New Employee Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +0.70% | -1.75% | |
| Annexon Biosciences to Present at the TD Cowen 46th Annual Health Care Conference | Press release | GlobeNewswire | +0.41% | +0.61% | |
| Annexon to Host In-Person and Virtual KOL Event to Discuss Vonaprument for the Treatment of Geographic Atrophy | Press release | GlobeNewswire | +1.23% | +3.07% | |
| Form 8-K Annexon, Inc. For: Feb 12 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +1.61% | |
| Annexon Reports Inducement Grants to New Employees Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +0.08% | +3.70% | |
| Form 8-K Annexon, Inc. For: Jan 14 | SEC filing · Form 8-K | SEC EDGAR | -4.33% | -7.92% | |
| Annexon Accelerating Next Generation Targeted Immunotherapy Platform for Treatment of Neuroinflammatory Diseases with Multiple Registrational Milestones in 2026 | Press release | GlobeNewswire | -0.57% | +5.91% | |
| Form 8-K Annexon, Inc. For: Jan 12 | SEC filing · Form 8-K | SEC EDGAR | -0.57% | +5.91% | |
| Annexon Submits Tanruprubart Marketing Authorization Application to the European Medicines Agency for Guillain-Barré Syndrome | Press release | GlobeNewswire | +0.00% | -4.17% | |
| Annexon Biosciences to Present at the 44th Annual J.P. Morgan Healthcare Conference | Press release | GlobeNewswire | +0.00% | -4.17% | |
| Annexon Reports Inducement Grant to New Employee Under Nasdaq Listing Rule 5635(c)(4) | Press release | GlobeNewswire | +1.97% | +1.66% | |
| Annexon Announces Closing of Public Offering and Full Exercise of Underwriters’ Option to Purchase Additional Shares for Gross Proceeds of $86.25 Million | Press release | GlobeNewswire | +1.86% | +12.27% | |
| Form 8-K Annexon, Inc. For: Nov 12 | SEC filing · Form 8-K | SEC EDGAR | +1.86% | +12.27% | |
| Annexon Announces Pricing of $75 Million Public Offering of Common Stock and Pre-Funded Warrants | Press release | GlobeNewswire | +5.08% | — | |
| Annexon Announces Proposed Public Offering of Common Stock and Pre-Funded Warrants | Press release | GlobeNewswire | +5.08% | — | |
| Annexon Reports Third Quarter 2025 Financial Results, Portfolio Progress and Key Anticipated Milestones | Press release | GlobeNewswire | -1.36% | +0.68% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ANNX section they belong to.
Where else ANNX is measured.
ANNX earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Annexon, Inc. - common stock's median reaction calculated?
Every labeled ANNX 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 367 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. 54% of ANNX'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 ANNX'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.