Builders FirstSource, Inc. (BLDR)
BLDR moved a median of -0.20% 30 minutes after news, and -0.32% by the close. How BLDR actually reacts to news — the realized, point-in-time move the market made, measured across 393 labeled events over the last three years with zero look-ahead.
BLDR’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.04% | 53% | 393 |
| 30-min | -0.20% | 45% | 393 |
| 60-min | -0.10% | 44% | 393 |
| to close | -0.32% | 41% | 392 |
| Middle 50% of BLDR reactions | -0.94% to +0.64% |
|---|---|
| Median reaction (30-min) | -0.20% |
| Measured reactions | 393 |
Half of all Builders FirstSource, Inc. news events land between -0.94% and +0.64% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How BLDR reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 37 | +0.43% | 70% | -0.62% |
| Analyst downgrades | 46 | -0.34% | 44% | +0.54% |
| Coverage initiations | 34 | 0.00% | 47% | +0.13% |
| Rating reiterations | 125 | -0.04% | 48% | +0.14% |
| Price-target raises | 23 | +0.23% | 61% | -0.16% |
| Price-target cuts | 72 | +0.04% | 53% | -0.43% |
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. See how BLDR ranks against every other measured name →
That’s how BLDR usually reacts — get an email when it moves on news →Email me when BLDR moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to BLDR's baseline. Nothing else.
Recent BLDR events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Builders FirstSource to Host Third Quarter 2026 Financial Results Conference Call and Webcast | Press release | Business Wire | +0.37% | +0.83% | |
| Builders FirstSource to Host 2026 Investor Day | Press release | Business Wire | +1.27% | +1.54% | |
| Builders FirstSource and Digs Announce Strategic Partnership to Deliver the Next Generation of AI-Powered Homebuilding | Press release | PR Newswire | -1.60% | -3.07% | |
| Form 8-K Builders FirstSource, For: Aug 03 | SEC filing · Form 8-K | SEC EDGAR | -0.03% | — | |
| Builders FirstSource Reports Second Quarter 2026 Results | Press release | Business Wire | +1.69% | -0.59% | |
| Form 10-Q Builders FirstSource, For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.41% | -2.16% | |
| Form 8-K Builders FirstSource, For: Jul 30 | SEC filing · Form 8-K | SEC EDGAR | +1.69% | -0.59% | |
| Form 15-12G QXO Insulation, LLC | SEC filing · Form 15-12G | SEC EDGAR | -0.35% | -0.24% | |
| Builders FirstSource to Host Second Quarter 2026 Financial Results Conference Call and Webcast | Press release | Business Wire | -0.45% | -0.71% | |
| Form 8-K Builders FirstSource, For: Jun 03 | SEC filing · Form 8-K | SEC EDGAR | -1.12% | +0.80% | |
| Form SD Builders FirstSource, | SEC filing · Form SD | SEC EDGAR | +0.04% | -0.26% | |
| Form S-8 Builders FirstSource, | SEC filing · Form S-8 | SEC EDGAR | +0.09% | +1.79% | |
| Builders FirstSource Announces COO and CHRO Succession Plan | Press release | Business Wire | -1.59% | -3.78% | |
| Form 8-K Builders FirstSource, For: May 14 | SEC filing · Form 8-K | SEC EDGAR | -1.59% | -3.78% | |
| Builders FirstSource Announces $500 Million Share Repurchase Authorization | Press release | Business Wire | -0.79% | -6.40% | |
| Builders FirstSource Reports First Quarter 2026 Results | Press release | Business Wire | -0.79% | -6.40% | |
| Form 10-Q Builders FirstSource, For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.14% | -2.24% | |
| Form 8-K Builders FirstSource, For: Apr 30 | SEC filing · Form 8-K | SEC EDGAR | -0.79% | -6.40% | |
| Alena Brenner Appointed Builders FirstSource Chief Legal Officer | Press release | Business Wire | +1.62% | -3.21% | |
| Builders FirstSource to Host First Quarter 2026 Financial Results Conference Call and Webcast | Press release | Business Wire | -0.19% | +2.96% | |
| Form ARS Builders FirstSource, For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.57% | +4.23% | |
| Form DEF 14A Builders FirstSource, For: Apr 02 | SEC filing · Form DEF | SEC EDGAR | +0.57% | +4.23% | |
| Form DEFA14A Builders FirstSource, | SEC filing · Form DEFA14A | SEC EDGAR | +0.57% | +4.23% | |
| Builders FirstSource Reports Fourth Quarter and Full-Year 2025 Results; Provides 2026 Financial Outlook | Press release | Business Wire | -0.30% | +1.43% | |
| Form 10-K Builders FirstSource, For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.22% | -1.60% | |
| Form 8-K Builders FirstSource, For: Feb 17 | SEC filing · Form 8-K | SEC EDGAR | -0.30% | +1.43% | |
| Builders FirstSource to Host Fourth Quarter and Full Year 2025 Financial Results Conference Call and Webcast | Press release | Business Wire | +0.92% | -1.33% | |
| Builders FirstSource Reports Third Quarter 2025 Results | Press release | Business Wire | +0.88% | -7.09% | |
| Form 10-Q Builders FirstSource, For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.32% | -6.41% | |
| Form 8-K Builders FirstSource, For: Oct 30 | SEC filing · Form 8-K | SEC EDGAR | +0.88% | -7.09% | |
| Builders FirstSource to Host Third Quarter 2025 Financial Results Conference Call and Webcast | Press release | Business Wire | -0.41% | -1.07% | |
| Builders FirstSource Charity Event Raises $1.6 Million for Blood Cancer United | Press release | Business Wire | -0.12% | +0.15% | |
| Builders FirstSource Announces Two Acquisitions in Turnkey Millwork Solutions | Press release | Business Wire | +0.03% | +1.41% | |
| Builders FirstSource Announces Dual Listing on NYSE Texas | Press release | Business Wire | +1.26% | -2.77% | |
| Form 8-A12B Builders FirstSource, | SEC filing · Form 8-A12B | SEC EDGAR | +1.26% | -2.77% | |
| Form CERT Builders FirstSource, | SEC filing · Form CERT | SEC EDGAR | +1.26% | -2.77% | |
| Builders FirstSource Reports Second Quarter 2025 Results | Press release | Business Wire | -1.64% | +3.49% | |
| Form 10-Q Builders FirstSource, For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.58% | +4.66% | |
| Form 8-K Builders FirstSource, For: Jul 31 | SEC filing · Form 8-K | SEC EDGAR | -1.64% | +3.49% | |
| Builders FirstSource to Host Second Quarter 2025 Financial Results Conference Call and Webcast | Press release | Business Wire | +0.22% | +1.98% | |
| Gayatri Narayan Joins Builders FirstSource as President, Technology and Digital Solutions | Press release | Business Wire | -0.80% | +2.66% | |
| Form SD Builders FirstSource, | SEC filing · Form SD | SEC EDGAR | -1.08% | -1.27% | |
| Form 8-K Builders FirstSource, For: May 27 | SEC filing · Form 8-K | SEC EDGAR | -0.82% | -3.42% | |
| Form 8-K Builders FirstSource, For: May 20 | SEC filing · Form 8-K | SEC EDGAR | +0.95% | +1.66% | |
| Form 8-K Builders FirstSource, For: May 08 | SEC filing · Form 8-K | SEC EDGAR | -0.29% | -1.25% | |
| Builders FirstSource Launches Offering of $500 Million of Senior Notes due 2035 | Press release | Business Wire | +0.51% | -0.86% | |
| Builders FirstSource Prices Offering of $750 Million of Senior Notes due 2035 | Press release | Business Wire | +1.06% | -2.39% | |
| Form 8-K Builders FirstSource, For: May 05 | SEC filing · Form 8-K | SEC EDGAR | +0.51% | -0.86% | |
| Builders FirstSource Announces $500 Million Share Repurchase Authorization | Press release | Business Wire | -2.02% | -3.54% | |
| Builders FirstSource Reports First Quarter 2025 Results | Press release | Business Wire | -2.02% | -3.54% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the BLDR section they belong to.
Where else BLDR is measured.
BLDR earnings → · Analyst actions → · SEC filings →
Other Basic Materials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Masonite International Corporation Ordinary Shares (Canada) (DOOR) | 394 | +0.01% | 52% |
| Ashland Inc. (ASH) | 393 | +0.02% | 50% |
| NIOCORP DEVELOPMENTS LTD (NIOBF) | 391 | 0.00% | 38% |
| Nucor Corporation (NUE) | 391 | -0.03% | 47% |
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 Basic Materials names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Builders FirstSource, Inc.'s median reaction calculated?
Every labeled BLDR 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 393 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. 45% of BLDR'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 BLDR'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.