ADTRAN Holdings, Inc. (ADTN)
ADTN moved a median of -0.13% 30 minutes after news, and +0.11% by the close. How ADTN actually reacts to news — the realized, point-in-time move the market made, measured across 445 labeled events over the last three years with zero look-ahead.
ADTN’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 44% | 445 |
| 30-min | -0.13% | 46% | 445 |
| 60-min | +0.14% | 52% | 445 |
| to close | +0.11% | 51% | 442 |
| Middle 50% of ADTN reactions | -1.05% to +0.89% |
|---|---|
| Median reaction (30-min) | -0.13% |
| Measured reactions | 445 |
Half of all ADTRAN Holdings, Inc. news events land between -1.05% and +0.89% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ADTN reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 18 | +0.21% | 56% | +2.53% |
| Analyst downgrades | 15 | +0.16% | 60% | +1.32% |
| Coverage initiations | 13 | -0.42% | 46% | +1.42% |
| Rating reiterations | 46 | +0.12% | 54% | +0.10% |
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 ADTN ranks against every other measured name →
That’s how ADTN usually reacts — get an email when it moves on news →Email me when ADTN moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ADTN's baseline. Nothing else.
Recent ADTN events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Adtran launches Mosaic One Agents to help teams easily scale operations | Press release | Business Wire | +1.32% | -1.06% | |
| Adtran showcases open optical networking for AI infrastructure at OIF’s ECOC 2026 interop demo | Press release | Business Wire | -0.55% | -2.34% | |
| BMC TV expands UK network for major sports broadcasts with Adtran and Fibre Technologies Ltd | Press release | Business Wire | -0.56% | -0.98% | |
| Bronstein, Gewirtz & Grossman, LLC Encourages ADTRAN Holdings, Inc. (ADTN) Shareholders to Inquire about Securities Investigation | Press release | ACCESS Newswire | +0.06% | -0.85% | |
| Bronstein, Gewirtz & Grossman, LLC Is Investigating ADTRAN Holdings, Inc. (ADTN) And Encourages Shareholders to Connect | Press release | ACCESS Newswire | +0.00% | +0.00% | |
| TEC reduces pressure on support teams with proactive outage communications powered by Adtran and GOCare | Press release | Business Wire | +1.23% | +0.39% | |
| Bronstein, Gewirtz & Grossman, LLC Initiates an Investigation into Allegations Against ADTRAN Holdings, Inc. (ADTN) And Encourages Shareholders to Reach Out | Press release | ACCESS Newswire | -0.06% | — | |
| ADTRAN Holdings, Inc. (ADTN) Investigation: Bronstein, Gewirtz & Grossman, LLC Encourages Shareholders to Contact the Firm to Learn More About the Investigation | Press release | ACCESS Newswire | -0.33% | -0.46% | |
| Adtran launches Mosaic One Fabric, empowering operators to build custom AI agents and workflows | Press release | Business Wire | -0.95% | -5.25% | |
| Bronstein, Gewirtz & Grossman, LLC Encourages ADTRAN Holdings, Inc. (ADTN) Stockholders to Inquire about Securities Investigation | Press release | ACCESS Newswire | +0.18% | -2.41% | |
| Form 10-Q ADTRAN Holdings, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +3.51% | -0.91% | |
| Form 8-K ADTRAN Holdings, Inc. For: Aug 03 | SEC filing · Form 8-K | SEC EDGAR | +3.51% | -0.91% | |
| TOHKnet and Adtran conduct Japan’s first 50G PON trial on a live network | Press release | Business Wire | +3.51% | -0.91% | |
| ADTRAN Holdings, Inc. reports second quarter 2026 financial results | Press release | Business Wire | +3.51% | -0.91% | |
| Bronstein, Gewirtz & Grossman, LLC Announces an Investigation Against ADTRAN Holdings, Inc. (ADTN) and Encourages Stockholders to Learn More About the Investigation | Press release | ACCESS Newswire | +0.06% | +2.19% | |
| Bronstein, Gewirtz & Grossman, LLC Encourages ADTRAN Holdings, Inc. (ADTN) Investors to Inquire about Securities Investigation | Press release | ACCESS Newswire | +0.36% | +5.23% | |
| Bronstein, Gewirtz & Grossman, LLC Initiates an Investigation into Allegations Against ADTRAN Holdings, Inc. (ADTN) And Encourages Stockholders to Reach Out | Press release | ACCESS Newswire | +0.00% | +2.06% | |
| ADTRAN Strengthens Capital Structure with New Senior Secured Credit Facility | Press release | Business Wire | -0.25% | -3.15% | |
| Form 8-K ADTRAN Holdings, Inc. For: Jul 21 | SEC filing · Form 8-K | SEC EDGAR | -0.25% | -3.15% | |
| ADTRAN Holdings, Inc. announces certain preliminary second quarter 2026 results | Press release | Business Wire | +1.92% | +10.00% | |
| Form 8-K ADTRAN Holdings, Inc. For: Jul 21 | SEC filing · Form 8-K | SEC EDGAR | +1.92% | +10.00% | |
| Form S-3ASR ADTRAN Holdings, Inc. | SEC filing · Form S-3ASR | SEC EDGAR | -2.20% | -1.44% | |
| Silo Communications expands fiber connectivity in rural Illinois with Adtran | Press release | Business Wire | +0.61% | +1.83% | |
| Oso Internet Solutions brings fiber broadband to one of the most remote Navajo communities with Adtran | Press release | Business Wire | -0.50% | -1.10% | |
| Form 11-K ADTRAN Holdings, Inc. For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | -1.37% | +1.78% | |
| Form 8-K ADTRAN Holdings, Inc. For: Jun 23 | SEC filing · Form 8-K | SEC EDGAR | -0.22% | -1.17% | |
| Adtran Holdings, Inc. Appoints Anne DelSanto to Board of Directors | Press release | Business Wire | -0.22% | -1.17% | |
| Adtran resolves long-running patent litigation, reinforcing commitment to defend innovation | Press release | Business Wire | -0.82% | -2.65% | |
| euNetworks launches new quantum-safe private connectivity service powered by Adtran’s encrypted optical transport technology | Press release | Business Wire | -0.42% | +15.54% | |
| Form 8-K ADTRAN Holdings, Inc. For: May 13 | SEC filing · Form 8-K | SEC EDGAR | +0.53% | -0.66% | |
| Adtran expands SDG 8700 Series to deliver Wi-Fi 7 at scale | Press release | Business Wire | -1.04% | +2.94% | |
| Form SD ADTRAN Holdings, Inc. | SEC filing · Form SD | SEC EDGAR | +0.14% | -1.63% | |
| Form 10-Q ADTRAN Holdings, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -2.28% | -3.10% | |
| Form 8-K ADTRAN Holdings, Inc. For: May 04 | SEC filing · Form 8-K | SEC EDGAR | -2.28% | -3.10% | |
| ADTRAN Holdings, Inc. reports first quarter 2026 financial results | Press release | Business Wire | -2.28% | -3.10% | |
| Form DEFA14A ADTRAN Holdings, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -0.01% | -0.01% | |
| Adtran and GLDS expand partnership to deliver billing-driven, zero-touch automation for subscriber lifecycle management | Press release | Business Wire | +0.11% | -1.30% | |
| Adtran’s SDG router portfolio receives FCC conditional approval, supporting ongoing broadband expansion | Press release | Business Wire | -0.68% | -1.02% | |
| Adtran wins two FTTH Innovation Awards for AI-driven network operations and home Wi-Fi | Press release | Business Wire | +0.70% | +0.35% | |
| ADTRAN Holdings, Inc. to release first quarter 2026 financial results on May 4, 2026 | Press release | Business Wire | +0.70% | +0.35% | |
| ProRail strengthens nationwide rail network with Adtran ALM fiber monitoring solution | Press release | Business Wire | +3.22% | +6.08% | |
| Adtran launches Ensemble Cloudlet multi-node to simplify high-availability edge AI deployments | Press release | Business Wire | -0.89% | +1.40% | |
| Form 8-K ADTRAN Holdings, Inc. For: Apr 01 | SEC filing · Form 8-K | SEC EDGAR | -0.89% | +1.40% | |
| Adtran extends 400G to the edge with new Terabit routing solution | Press release | Business Wire | +0.77% | +4.63% | |
| Form ARS ADTRAN Holdings, Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.27% | -0.31% | |
| Form DEF 14A ADTRAN Holdings, Inc. For: Mar 27 | SEC filing · Form DEF | SEC EDGAR | +0.27% | -0.31% | |
| Form DEFA14A ADTRAN Holdings, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | +0.27% | -0.31% | |
| Form PRE 14A ADTRAN Holdings, Inc. For: Mar 13 | SEC filing · Form PRE | SEC EDGAR | -0.59% | +1.47% | |
| Adtran to showcase industry-leading open optical networking for the AI era at OFC 2026 | Press release | Business Wire | +0.24% | -0.50% | |
| Adtran plays key role in OIF’s OFC 2026 interoperability demo with FSP 3000 OLS, ZR+ coherent plugs and domain controller | Press release | Business Wire | +0.10% | +1.39% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ADTN section they belong to.
Where else ADTN is measured.
ADTN earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Check Point Software Technologies Ltd. - Ordinary Shares (CHKP) | 447 | +0.22% | 58% |
| CleanSpark, Inc. (CLSK) | 447 | -0.12% | 47% |
| LRAD (LRAD) | 444 | 0.00% | 46% |
| CGI Inc. (GIB) | 443 | +0.13% | 59% |
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.
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Every name we’ve measured, in one place.
How the numbers are made.
How is ADTRAN Holdings, Inc.'s median reaction calculated?
Every labeled ADTN 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 445 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. 46% of ADTN'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 ADTN'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.