Diamond Offshore Drilling, Inc. (DO)
DO moved a median of +0.10% 30 minutes after news, and -0.26% by the close. How DO actually reacts to news — the realized, point-in-time move the market made, measured across 35 labeled events over the last three years with zero look-ahead.
DO’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.03% | 46% | 35 |
| 30-min | +0.10% | 54% | 35 |
| 60-min | +0.46% | 71% | 35 |
| to close | -0.26% | 37% | 35 |
| Middle 50% of DO reactions | -0.33% to +0.82% |
|---|---|
| Median reaction (30-min) | +0.10% |
| Measured reactions | 35 |
Half of all Diamond Offshore Drilling, Inc. news events land between -0.33% and +0.82% 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 DO moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to DO's baseline. Nothing else.
Recent DO events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Noble Corporation and Diamond Offshore Provide Update on Expected Closing of Transaction | Press release | PR Newswire | +1.70% | -0.85% | |
| Diamond Offshore Reports Second Quarter 2024 Results | Press release | PR Newswire | +1.28% | -0.68% | |
| Noble Corporation and Diamond Offshore Announce Expiration of Hart-Scott-Rodino Act Waiting Period and Provide Transaction Update | Press release | PR Newswire | +0.73% | +0.18% | |
| DIAMOND OFFSHORE ANNOUNCES NEW DRILLSHIP COMMITMENT | Press release | PR Newswire | -1.05% | -0.93% | |
| DIAMOND OFFSHORE TO RELEASE SECOND QUARTER 2024 RESULTS | Press release | PR Newswire | +0.18% | -0.68% | |
| BRODSKY & SMITH SHAREHOLDER UPDATE: Notifying Investors of the Following Investigations: Diamond Offshore Drilling, Inc (NYSE - DO), PowerSchool Holdings, Inc. (NYSE - PWSC), SPAR Group, Inc. (Nasdaq - SGRP), WalkMe Ltd. (Nasdaq - WKME) | Press release | GlobeNewswire | +0.10% | -0.75% | |
| ALERT: Rowley Law PLLC is Investigating Proposed Acquisition of Diamond Offshore Drilling, Inc. | Press release | PR Newswire | -0.98% | -0.26% | |
| BRODSKY & SMITH SHAREHOLDER UPDATE: Notifying Investors of the Following Investigations: Diamond Offshore Drilling, Inc (NYSE - DO), PowerSchool Holdings, Inc. (NYSE - PWSC), SPAR Group, Inc. (Nasdaq - SGRP), WalkMe Ltd. (Nasdaq - WKME) | Press release | GlobeNewswire | -0.03% | +1.38% | |
| DO STOCK ALERT: Halper Sadeh LLC Is Investigating Whether the Sale of Diamond Offshore Drilling, Inc. Is Fair to Shareholders | Press release | Business Wire | -0.26% | +1.91% | |
| Noble Corporation plc announces agreement to acquire Diamond Offshore Drilling, Inc. | Press release | PR Newswire | -0.26% | +1.91% | |
| DIAMOND OFFSHORE ANNOUNCES NEW DRILLSHIP COMMITMENT | Press release | PR Newswire | +0.20% | +0.89% | |
| Diamond Offshore Reports First Quarter 2024 Results | Press release | PR Newswire | +3.23% | +2.88% | |
| DIAMOND OFFSHORE TO RELEASE FIRST QUARTER 2024 RESULTS | Press release | PR Newswire | -0.76% | -1.98% | |
| DIAMOND OFFSHORE ANNOUNCES NEW DRILLSHIP COMMITMENT | Press release | PR Newswire | -1.52% | +1.44% | |
| Diamond Offshore Reports Fourth Quarter 2023 Results | Press release | PR Newswire | +0.61% | -3.04% | |
| DIAMOND OFFSHORE ANNOUNCES NEW FLOATER COMMITMENTS | Press release | PR Newswire | +1.06% | +4.58% | |
| DIAMOND OFFSHORE TO RELEASE FOURTH QUARTER 2023 RESULTS | Press release | PR Newswire | +0.13% | -1.39% | |
| DIAMOND OFFSHORE ANNOUNCES NEW DRILLSHIP CONTRACT | Press release | PR Newswire | -1.51% | +0.56% | |
| Diamond Offshore Reports Third Quarter 2023 Results and Announces Contract Awards of $240 Million | Press release | PR Newswire | +1.27% | -2.21% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the DO section they belong to.
Where else DO is measured.
DO earnings → · Analyst actions → · SEC filings →
Other Energy names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Ensign Energy Services Inc (ESI_TSE) | 36 | -0.36% | 42% |
| Holly Energy Partners, L.P. (HEP) | 36 | +0.19% | 73% |
| OIL SEARCH LTD S/ADR (OISHY) | 35 | 0.00% | 44% |
| SCEPTER HOLDINGS INC (BRZL) | 34 | 0.00% | 29% |
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 Energy names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Diamond Offshore Drilling, Inc.'s median reaction calculated?
Every labeled DO 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 35 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 DO'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 DO'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.