Sientra, Inc. (SIEN)
SIEN moved a median of -0.09% 30 minutes after news, and -6.63% by the close. How SIEN actually reacts to news — the realized, point-in-time move the market made, measured across 17 labeled events over the last three years with zero look-ahead.
SIEN’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -2.97% | 27% | 15 |
| 30-min | -0.09% | 38% | 16 |
| 60-min | -5.89% | 19% | 16 |
| to close | -6.63% | 38% | 16 |
Small sample: only 17 measured events — treat these medians as indicative, not stable.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when SIEN moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to SIEN's baseline. Nothing else.
Recent SIEN events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Sientra Announces Completion and Winning Bidders of its Section 363 Sales Auction | Press release | GlobeNewswire | — | — | |
| Form 8-K Sientra, Inc. For: Feb 13 | SEC filing · Form 8-K | SEC EDGAR | -4.04% | -14.40% | |
| Form 8-K Sientra, Inc. For: Feb 12 | SEC filing · Form 8-K | SEC EDGAR | -3.15% | -24.44% | |
| Sientra to Pursue Strategic Sale of its Business Through Voluntary Chapter 11 Process | Press release | GlobeNewswire | -3.15% | -24.44% | |
| Form 8-K Sientra, Inc. For: Jan 28 | SEC filing · Form 8-K | SEC EDGAR | +5.00% | +10.17% | |
| Form 8-K Sientra, Inc. For: Jan 15 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +3.81% | |
| Form 8-K Sientra, Inc. For: Dec 14 | SEC filing · Form 8-K | SEC EDGAR | +0.81% | +0.49% | |
| Form 10-Q Sientra, Inc. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -2.97% | -12.79% | |
| Form 8-K Sientra, Inc. For: Nov 09 | SEC filing · Form 8-K | SEC EDGAR | +2.00% | +35.71% | |
| Sientra Reports Third Quarter Financial and Operational Results | Press release | GlobeNewswire | +2.00% | +35.71% | |
| Sientra to Present at the Stifel 2023 Healthcare Conference | Press release | GlobeNewswire | +0.00% | -5.36% | |
| Form 8-K Sientra, Inc. For: Oct 30 | SEC filing · Form 8-K | SEC EDGAR | -8.64% | -38.46% | |
| Sientra Reports Preliminary Unaudited Third Quarter 2023 Financial Results and Provides Update on Outlook | Press release | GlobeNewswire | -8.64% | -38.46% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the SIEN section they belong to.
Where else SIEN is measured.
SIEN earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| RAMSAY HEALTH CARE LTD (RMSYF) | 18 | 0.00% | 0% |
| HIRU CORP (HIRU) | 17 | -0.34% | 44% |
| ContraFect Corporation (CFRX) | 16 | -0.95% | 33% |
| NEXIEN BIOPHARMA INC (NXEN) | 16 | 0.00% | 27% |
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 Sientra, Inc.'s median reaction calculated?
Every labeled SIEN 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 17 events is what this page reports. On a sample this small (17 events), treat these medians as indicative, not stable. 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.
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 SIEN'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.