Pacific Biosciences of California, Inc. (PACB)
PACB moved a median of -0.29% 30 minutes after news, and -0.64% by the close. How PACB actually reacts to news — the realized, point-in-time move the market made, measured across 440 labeled events over the last three years with zero look-ahead.
PACB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 44% | 440 |
| 30-min | -0.29% | 44% | 440 |
| 60-min | -0.42% | 46% | 440 |
| to close | -0.64% | 42% | 439 |
| Middle 50% of PACB reactions | -2.37% to +1.43% |
|---|---|
| Median reaction (30-min) | -0.29% |
| Measured reactions | 440 |
Half of all Pacific Biosciences of California, Inc. news events land between -2.37% and +1.43% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How PACB reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 24 | -0.83% | 21% | -1.69% |
| Analyst downgrades | 13 | -0.33% | 39% | +3.55% |
| Coverage initiations | 18 | +1.02% | 56% | +5.84% |
| Rating reiterations | 45 | -0.06% | 42% | +0.47% |
| Price-target cuts | 23 | +0.31% | 65% | 0.00% |
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. 1 further class was observed with fewer than 10 measured events and is not published. See how PACB ranks against every other measured name →
That’s how PACB usually reacts — get an email when it moves on news →Email me when PACB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to PACB's baseline. Nothing else.
Recent PACB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| PacBio and TychoBio Collaborate to Train AI Models for Rare Disease RNA Therapeutics | Press release | GlobeNewswire | +3.18% | -9.70% | |
| PacBio to Participate in the Morgan Stanley 24?? Annual Global Healthcare Conference | Press release | GlobeNewswire | +1.54% | +4.65% | |
| Form S-8 PACIFIC BIOSCIENCES OF | SEC filing · Form S-8 | SEC EDGAR | -0.85% | +0.42% | |
| Form 10-Q PACIFIC BIOSCIENCES OF For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.85% | +0.42% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Jul 30 | SEC filing · Form 8-K | SEC EDGAR | -4.20% | -11.07% | |
| PacBio Announces Faster Runs, Up to 50% More HiFi Data, and New Compliance Controls for the Vega system | Press release | GlobeNewswire | -1.74% | -9.72% | |
| PacBio Announces Second Quarter 2026 Financial Results | Press release | GlobeNewswire | -4.20% | -11.07% | |
| PacBio Appoints Mark Van Oene as President and Chief Executive Officer | Press release | GlobeNewswire | -4.20% | -11.07% | |
| PacBio to Participate in the Canaccord Genuity 46th Annual Growth Conference | Press release | GlobeNewswire | +2.20% | +1.45% | |
| PacBio to Report Second Quarter 2026 Financial Results on August 5, 2026 | Press release | GlobeNewswire | +0.33% | -1.32% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Jul 08 | SEC filing · Form 8-K | SEC EDGAR | -2.72% | -3.70% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Jun 03 | SEC filing · Form 8-K | SEC EDGAR | -1.50% | -9.38% | |
| Form SD PACIFIC BIOSCIENCES OF | SEC filing · Form SD | SEC EDGAR | +2.71% | +13.95% | |
| PacBio SPRQ-Nx Chemistry Now Shipping Worldwide, Enabling Sub-$300 HiFi Genomes for Large Scale Projects and AI-Enhanced Sequencing | Press release | GlobeNewswire | -1.21% | +1.61% | |
| Form DEFA14A PACIFIC BIOSCIENCES OF | SEC filing · Form DEFA14A | SEC EDGAR | -1.21% | +1.61% | |
| PacBio to Participate in the Jefferies Global Healthcare Conference | Press release | GlobeNewswire | +1.20% | -2.40% | |
| Blank Bio Announces Seed Financing and Strategic Collaboration with PacBio to Advance RNA Foundation Models for Precision Oncology | Press release | Business Wire | -2.15% | -0.86% | |
| HiFi Solves Sub-fertility Consortium in Asia Pacific Reports First Major Study Using HiFi Long-Read Sequencing to Investigate Unexplained Subfertility and Recurrent Pregnancy Loss | Press release | GlobeNewswire | +3.24% | -2.52% | |
| Form 10-Q PACIFIC BIOSCIENCES OF For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +3.24% | -2.52% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: May 07 | SEC filing · Form 8-K | SEC EDGAR | -2.67% | -7.24% | |
| PacBio Announces First Quarter 2026 Financial Results | Press release | GlobeNewswire | -2.67% | -7.24% | |
| Form ARS PACIFIC BIOSCIENCES OF For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.00% | +0.65% | |
| Form DEF 14A PACIFIC BIOSCIENCES OF For: Jun 03 | SEC filing · Form DEF | SEC EDGAR | +0.00% | +0.65% | |
| Form DEFA14A PACIFIC BIOSCIENCES OF | SEC filing · Form DEFA14A | SEC EDGAR | +0.00% | +0.65% | |
| PacBio and Lucid Genomics Announce Compatibility Collaboration to Advance Tertiary Analysis for Long-Read Sequencing | Press release | GlobeNewswire | -0.29% | -0.57% | |
| PacBio to Report First Quarter 2026 Financial Results on May 7, 2026 | Press release | GlobeNewswire | +1.81% | +1.81% | |
| PacBio and Covaris Announce Joint Workflow Enabling HiFi Long-Read Sequencing of FFPE Tumor Samples | Press release | GlobeNewswire | +2.96% | +5.26% | |
| Basecamp Research Selects PacBio HiFi Sequencing to Power Trillion Gene Atlas Initiative | Press release | GlobeNewswire | +0.36% | -2.92% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Mar 02 | SEC filing · Form 8-K | SEC EDGAR | +1.11% | +2.96% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Mar 03 | SEC filing · Form 8-K | SEC EDGAR | +0.24% | +0.00% | |
| PacBio Announces the Appointment of Chris Gibson to the Board of Directors | Press release | GlobeNewswire | +0.24% | +0.00% | |
| Form 10-K PACIFIC BIOSCIENCES OF For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +2.13% | +8.54% | |
| Form S-3ASR PACIFIC BIOSCIENCES OF | SEC filing · Form S-3ASR | SEC EDGAR | +2.13% | +8.54% | |
| Form S-8 PACIFIC BIOSCIENCES OF | SEC filing · Form S-8 | SEC EDGAR | +2.13% | +8.54% | |
| PacBio and DNAstack Launch First Global Federated HiFi Whole Genome Dataset to Accelerate Rare Disease Research | Press release | GlobeNewswire | -0.25% | +5.06% | |
| PacBio to Participate in the TD Cowen 46th Annual Health Care Conference | Press release | GlobeNewswire | -1.55% | +4.35% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Feb 12 | SEC filing · Form 8-K | SEC EDGAR | +2.64% | -9.52% | |
| PacBio Announces Fourth Quarter and Full Year 2025 Financial Results | Press release | GlobeNewswire | +2.64% | -9.52% | |
| PacBio Joins iHope Initiative as First Long-Read Genomic Sequencing Partner | Press release | GlobeNewswire | +0.75% | -0.54% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Jan 28 | SEC filing · Form 8-K | SEC EDGAR | -1.24% | -3.46% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Jan 30 | SEC filing · Form 8-K | SEC EDGAR | -1.56% | -8.04% | |
| PacBio Completes Sale of Short-Read Sequencing Assets | Press release | GlobeNewswire | -1.56% | -8.04% | |
| PacBio to Report Fourth Quarter and Full Year 2025 Financial Results on February 12, 2026 | Press release | GlobeNewswire | -2.13% | -7.75% | |
| Form 8-K PACIFIC BIOSCIENCES OF For: Jan 12 | SEC filing · Form 8-K | SEC EDGAR | +7.69% | +2.55% | |
| PacBio Announces Plans for Collaboration With n-Lorem Foundation and EspeRare to Advance Precision Therapies for Rare Genetic Diseases | Press release | GlobeNewswire | +7.69% | +2.55% | |
| PacBio Announces Preliminary Fourth Quarter and Full Year 2025 Revenue | Press release | GlobeNewswire | +7.69% | +2.55% | |
| PacBio HiFi Adopted as First-Line Sequencing Approach to Investigate Sudden Unexplained Death in Childhood (SUDC) | Press release | GlobeNewswire | +7.69% | +2.55% | |
| PacBio and UC Davis Researchers Introduce CiFi, a New Long-Read 3C Method That Enables Chromosome-Scale Assemblies from a Single SMRT Cell | Press release | GlobeNewswire | -4.22% | -4.22% | |
| PacBio to Present at the 44th Annual J.P. Morgan Healthcare Conference | Press release | GlobeNewswire | +2.00% | +6.86% | |
| PacBio to Participate in the Piper Sandler 37th Annual Healthcare Conference | Press release | GlobeNewswire | -0.21% | -0.43% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the PACB section they belong to.
Where else PACB is measured.
PACB earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| BOVIE MEDICAL (BVX) | 441 | 0.00% | 46% |
| Catalyst Pharmaceuticals, Inc. (CPRX) | 441 | 0.00% | 50% |
| EyePoint, Inc. (EYPT) | 439 | -0.25% | 46% |
| Abeona Therapeutics Inc. (ABEO) | 438 | +0.09% | 51% |
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 Healthcare names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Pacific Biosciences of California, Inc.'s median reaction calculated?
Every labeled PACB 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 440 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. 44% of PACB'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 PACB'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.