AcelRx Pharmaceuticals, Inc. (ACRX)
How ACRX actually reacts to news — the realized, point-in-time move the market made, measured across 39 labeled events over the last three years with zero look-ahead.
ACRX’s median reaction, across the day.
Half of all AcelRx Pharmaceuticals, Inc. news events land between -2.30% and +1.04% at 30 minutes.
Reaction stats as of 2026-08-13. Reaction = percent move vs. the price at the news timestamp.
Email me when ACRX moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ACRX’s baseline. Nothing else.
Get “How ACRX reacts to news” as a PDF.
A free one-page summary: ACRX’s median reaction to news and the full breakdown by event type — the numbers on this page, in one page.
Recent ACRX events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K TALPHERA, INC. For: Jan 17 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K TALPHERA, INC. For: Jan 12 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| AcelRx Announces Rebranding With Name Change to Talphera, Inc. | Press release | PR Newswire | +0.00% | +10.10% | |
| Form 8-K TALPHERA, INC. For: Jan 09 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +10.10% | |
| AcelRx Pharmaceuticals Announces Publication of Study Evaluating Anticoagulation Practices for Continuous Renal Replacement Therapy in the United States | Press release | PR Newswire | +0.00% | -7.38% | |
| Form EFFECT ACELRX PHARMACEUTICALS | SEC filing · Form EFFECT | SEC EDGAR | -3.90% | -0.78% | |
| Form S-3 ACELRX PHARMACEUTICALS | SEC filing · Form S-3 | SEC EDGAR | +3.05% | +11.27% | |
| Form S-8 ACELRX PHARMACEUTICALS | SEC filing · Form S-8 | SEC EDGAR | +3.05% | +11.27% | |
| Form 10-Q ACELRX PHARMACEUTICALS For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +3.73% | +3.11% | |
| AcelRx Reports Third Quarter 2023 Financial Results and Provides Corporate Update | Press release | PR Newswire | -2.76% | -8.60% | |
| Form 8-K ACELRX PHARMACEUTICALS For: Nov 08 | SEC filing · Form 8-K | SEC EDGAR | -2.76% | -8.60% | |
| AcelRx to Host KOL Panel Discussion on Current Anticoagulant Use in Dialysis and the Upcoming Niyad™ Clinical Study | Press release | PR Newswire | -2.24% | -0.32% | |
| AcelRx to Host Third Quarter 2023 Financial Results Call and Webcast on November 8, 2023 | Press release | PR Newswire | +0.00% | -7.83% | |
| Form 8-K ACELRX PHARMACEUTICALS For: Oct 18 | SEC filing · Form 8-K | SEC EDGAR | +7.57% | -3.93% | |
| Form 8-K ACELRX PHARMACEUTICALS For: Oct 10 | SEC filing · Form 8-K | SEC EDGAR | +1.41% | -2.79% | |
| Form 8-K ACELRX PHARMACEUTICALS For: Oct 02 | SEC filing · Form 8-K | SEC EDGAR | -4.51% | +2.47% | |
| Form DEFA14A ACELRX PHARMACEUTICALS | SEC filing · Form DEFA14A | SEC EDGAR | -4.51% | +2.47% | |
| AcelRx Receives IDE Approval for Niyad and Advances to a Single Registration Study | Press release | PR Newswire | +0.00% | +3.02% | |
| Form 8-K ACELRX PHARMACEUTICALS For: Sep 22 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.17% | |
| AcelRx Pharmaceuticals to Participate in the H.C. Wainwright Annual Investment Conference | Press release | PR Newswire | -1.90% | +0.13% | |
| Form DEF 14A ACELRX PHARMACEUTICALS For: Oct 10 | SEC filing · Form DEF | SEC EDGAR | -0.92% | -15.60% | |
| Form DEFA14A ACELRX PHARMACEUTICALS | SEC filing · Form DEFA14A | SEC EDGAR | -0.92% | -15.60% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ACRX section they belong to.
More of the dataset.
ACRX earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is AcelRx Pharmaceuticals, Inc.'s median reaction calculated?
Every labeled ACRX 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 39 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. 56% of ACRX'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 2026-08-13.
Does ACRX'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.