Boundless Bio, Inc. (BOLD)
BOLD moved a median of -0.48% 30 minutes after news, and 0.00% by the close. How BOLD actually reacts to news — the realized, point-in-time move the market made, measured across 166 labeled events over the last three years with zero look-ahead.
BOLD’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 32% | 151 |
| 30-min | -0.48% | 44% | 165 |
| 60-min | 0.00% | 41% | 165 |
| to close | 0.00% | 38% | 165 |
| Middle 50% of BOLD reactions | -1.05% to +1.88% |
|---|---|
| Median reaction (30-min) | -0.48% |
| Measured reactions | 166 |
Half of all Boundless Bio, Inc. news events land between -1.05% and +1.88% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when BOLD moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to BOLD's baseline. Nothing else.
Recent BOLD events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Are OPCH, PCRX, RXO, BOLD Obtaining Fair Deals for their Shareholders? | Press release | PR Newswire | +3.70% | -4.71% | |
| Form S-4 Boundless Bio, Inc. | SEC filing · Form S-4 | SEC EDGAR | -4.26% | -1.94% | |
| Callio Therapeutics Appoints Zachary Hornby as Chief Executive Officer | Press release | GlobeNewswire | +0.09% | -0.35% | |
| Form 8-K Boundless Bio, Inc. For: Aug 28 | SEC filing · Form 8-K | SEC EDGAR | +2.67% | +0.00% | |
| Form 10-Q Boundless Bio, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +3.30% | +3.21% | |
| Halper Sadeh LLC is Investigating Whether BOLD and NDRA are Obtaining Fair Deals for their Shareholders | Press release | GlobeNewswire | -1.88% | -1.96% | |
| BOLD Stock Alert: Halper Sadeh LLC is Investigating Whether Boundless Bio, Inc. is Obtaining a Fair Price for its Shareholders | Press release | Business Wire | +0.93% | +3.99% | |
| Boundless Bio and Serapha Bio Announce Merger Agreement and $230 Million Concurrent Private Placement | Press release | GlobeNewswire | -0.42% | +8.33% | |
| Form 8-K Boundless Bio, Inc. For: Jun 22 | SEC filing · Form 8-K | SEC EDGAR | -0.42% | +8.33% | |
| Form 8-K Boundless Bio, Inc. For: Jun 15 | SEC filing · Form 8-K | SEC EDGAR | — | -1.41% | |
| Boundless Bio Reports First Quarter 2026 Financial Results and Business Highlights | Press release | GlobeNewswire | +0.00% | -5.26% | |
| Form 10-Q Boundless Bio, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | -5.26% | |
| Form 8-K Boundless Bio, Inc. For: May 08 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -5.26% | |
| Form ARS Boundless Bio, Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.00% | -0.69% | |
| Form DEF 14A Boundless Bio, Inc. For: Jun 15 | SEC filing · Form DEF | SEC EDGAR | +0.00% | -0.69% | |
| Form DEFA14A Boundless Bio, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | +0.00% | -0.69% | |
| Boundless Bio Presents Preclinical Breast Cancer Data from its Oral Kinesin Degrader Program at 2026 AACR Annual Meeting | Press release | GlobeNewswire | -1.58% | +1.27% | |
| Form 8-K Boundless Bio, Inc. For: Apr 13 | SEC filing · Form 8-K | SEC EDGAR | -2.74% | +6.85% | |
| Boundless Bio Announces Upcoming Presentation of Oral Kinesin Degrader Program at the American Association for Cancer Research Annual Meeting 2026 | Press release | GlobeNewswire | — | +0.86% | |
| Boundless Bio Reports Fourth Quarter and Full Year 2025 Financial Results and Business Highlights | Press release | GlobeNewswire | +2.68% | +1.79% | |
| Form 10-K Boundless Bio, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +2.68% | +1.79% | |
| Form 8-K Boundless Bio, Inc. For: Mar 03 | SEC filing · Form 8-K | SEC EDGAR | +2.68% | +1.79% | |
| Boundless Bio to Participate in the Leerink Global Healthcare Conference | Press release | GlobeNewswire | +0.88% | +0.00% | |
| Boundless Bio to Participate in the Guggenheim Emerging Outlook: Biotech Summit 2026 | Press release | GlobeNewswire | +0.00% | +5.83% | |
| Boundless Bio Advances Novel Kinesin Degrader Program BBI-940 and Extends Cash Runway | Press release | GlobeNewswire | +3.25% | +0.00% | |
| Boundless Bio to Participate in the Piper Sandler 37th Annual Healthcare Conference | Press release | GlobeNewswire | — | -0.89% | |
| Boundless Bio Reports Third Quarter 2025 Financial Results and Business Highlights | Press release | GlobeNewswire | +1.59% | +0.00% | |
| Form 10-Q Boundless Bio, Inc. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +1.59% | +0.00% | |
| Form 8-K Boundless Bio, Inc. For: Nov 05 | SEC filing · Form 8-K | SEC EDGAR | +1.59% | +0.00% | |
| Boundless Bio Announces Upcoming Presentation at the 2025 AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics | Press release | GlobeNewswire | +0.00% | +3.94% | |
| Boundless Bio Reports Second Quarter 2025 Financial Results and Business Highlights | Press release | GlobeNewswire | +0.00% | +0.00% | |
| Form 10-Q Boundless Bio, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | +0.00% | |
| Form 8-K Boundless Bio, Inc. For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.00% | |
| Form 8-K Boundless Bio, Inc. For: Jun 23 | SEC filing · Form 8-K | SEC EDGAR | +4.21% | +4.85% | |
| Boundless Bio to Participate in the Goldman Sachs 46th Annual Global Healthcare Conference | Press release | GlobeNewswire | +0.00% | -0.84% | |
| Boundless Bio Announces Portfolio Prioritization and Runway Extension | Press release | GlobeNewswire | -5.06% | -17.72% | |
| Form 8-K Boundless Bio, Inc. For: May 23 | SEC filing · Form 8-K | SEC EDGAR | -5.06% | -17.72% | |
| Boundless Bio Reports First Quarter 2025 Financial Results and Business Highlights | Press release | GlobeNewswire | -7.49% | -13.77% | |
| Form 10-Q Boundless Bio, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -7.49% | -13.77% | |
| Form 8-K Boundless Bio, Inc. For: May 09 | SEC filing · Form 8-K | SEC EDGAR | -7.49% | -13.77% | |
| Form ARS Boundless Bio, Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.00% | +10.69% | |
| Form DEF 14A Boundless Bio, Inc. For: Jun 23 | SEC filing · Form DEF | SEC EDGAR | +0.00% | +10.69% | |
| Form DEFA14A Boundless Bio, Inc. | SEC filing · Form DEFA14A | SEC EDGAR | +0.00% | +10.69% | |
| Form EFFECT Boundless Bio, Inc. | SEC filing · Form EFFECT | SEC EDGAR | — | +2.52% | |
| Boundless Bio to Participate in the Needham Virtual Healthcare Conference | Press release | GlobeNewswire | +0.00% | -3.50% | |
| Form 8-K Boundless Bio, Inc. For: Apr 01 | SEC filing · Form 8-K | SEC EDGAR | — | +5.67% | |
| Form S-3 Boundless Bio, Inc. | SEC filing · Form S-3 | SEC EDGAR | — | +5.67% | |
| Boundless Bio Reports Fourth Quarter and Full Year 2024 Financial Results and Business Highlights | Press release | GlobeNewswire | — | +2.03% | |
| Form 10-K Boundless Bio, Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | — | +2.03% | |
| Form 8-K Boundless Bio, Inc. For: Mar 27 | SEC filing · Form 8-K | SEC EDGAR | — | +2.03% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the BOLD section they belong to.
Where else BOLD is measured.
BOLD earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| BIOSTAR PHARMS INC (BSPM) | 167 | 0.00% | 41% |
| Sonoma Pharmaceuticals, Inc. (SNOA) | 167 | -0.32% | 42% |
| CymaBay Therapeutics Inc. (CBAY) | 166 | +0.02% | 52% |
| Innoviva, Inc. (INVA) | 166 | +0.10% | 54% |
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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How the numbers are made.
How is Boundless Bio, Inc.'s median reaction calculated?
Every labeled BOLD 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 166 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 BOLD'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 BOLD'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.