Sienna Senior Living Inc (SIA_TSE)
SIA_TSE moved a median of +0.25% 30 minutes after news, and -0.07% by the close. How SIA_TSE actually reacts to news — the realized, point-in-time move the market made, measured across 101 labeled events over the last three years with zero look-ahead.
SIA_TSE’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.08% | 52% | 31 |
| 30-min | +0.25% | 65% | 31 |
| 60-min | +0.10% | 55% | 31 |
| to close | -0.07% | 48% | 31 |
| Middle 50% of SIA_TSE reactions | -0.12% to +0.69% |
|---|---|
| Median reaction (30-min) | +0.25% |
| Measured reactions | 101 |
Half of all Sienna Senior Living Inc news events land between -0.12% and +0.69% 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 SIA_TSE moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to SIA_TSE's baseline. Nothing else.
Recent SIA_TSE events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Sienna Announces October Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Announces Third Quarter 2026 Results Release Date and Conference Call | Press release | GlobeNewswire | — | — | |
| Sienna Continues Platform Growth in Ontario | Press release | GlobeNewswire | — | — | |
| Sienna Continues Platform Growth in Ontario | Press release | GlobeNewswire | — | — | |
| Sienna Announces September Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Announces August Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Forms Joint Venture With Fiera Infrastructure to Expedite Long-Term Care Redevelopments | Press release | GlobeNewswire | — | — | |
| Sienna Reports Second Quarter 2026 Financial Results and Forms Redevelopment Joint Venture with Fiera Infrastructure | Press release | GlobeNewswire | — | — | |
| Sienna Announces Confirmation of Morningstar DBRS Credit Rating | Press release | GlobeNewswire | — | — | |
| Sienna Announces Long-Term Care Redevelopment in Greater Toronto Area | Press release | GlobeNewswire | — | — | |
| Sienna Announces July Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Senior Living Named One of Canada's Best Companies by TIME and Statista for Second Consecutive Year | Press release | GlobeNewswire | — | — | |
| Sienna Announces Second Quarter 2026 Results Release Date and Conference Call | Press release | GlobeNewswire | — | — | |
| Sienna Completes Acquisition in Greater Ottawa Area | Press release | GlobeNewswire | — | — | |
| Sienna Announces June Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Senior Living Inc. Announces Voting Results From Annual Meeting | Press release | GlobeNewswire | — | — | |
| Sienna Announces May Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Reports First Quarter 2026 Financial Results and Continues Platform Expansion | Press release | GlobeNewswire | — | — | |
| Sienna Continues Platform Growth | Press release | GlobeNewswire | — | — | |
| Sienna Announces April Dividend | Press release | GlobeNewswire | — | — | |
| Sienna for Seniors Foundation $1 Million Gift Advances Healthy Aging Research at Ontario Tech University | Press release | GlobeNewswire | — | — | |
| Sienna Senior Living recognized by The Globe and Mail’s Women Lead Here Benchmark | Press release | GlobeNewswire | — | — | |
| Sienna Announces First Quarter 2026 Results Release Date and Conference Call | Press release | GlobeNewswire | — | — | |
| Sienna Completes Acquisition in Greater Toronto Area | Press release | GlobeNewswire | — | — | |
| Sienna Announces March Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Reports Fourth Quarter 2025 Financial Results and Continues Platform Growth | Press release | GlobeNewswire | — | — | |
| Sienna Continues Platform Growth in Ontario and British Columbia | Press release | GlobeNewswire | — | — | |
| Sienna Announces February Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Announces January Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Announces Fourth Quarter 2025 Results Release Date and Conference Call | Press release | GlobeNewswire | — | — | |
| Sienna Completes Acquisition in the Greater Toronto Area | Press release | GlobeNewswire | — | — | |
| Sienna Announces Completion of $250 Million Offering of 3.524% Series F Senior Unsecured Debentures | Press release | GlobeNewswire | — | — | |
| Sienna Completes Acquisition in Waterloo, Ontario | Press release | GlobeNewswire | — | — | |
| Sienna Announces December Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Announces Offering of $250 Million of 3.524% Series F Senior Unsecured Debentures and Redemption of C$175 Million of Series B Senior Unsecured Debentures | Press release | GlobeNewswire | — | — | |
| Sienna Announces November Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Expands Retirement Portfolio in Key Ontario Market | Press release | GlobeNewswire | — | — | |
| Sienna Announces The Opening of Its Long-Term Care Community Redevelopment in Brantford, Ontario | Press release | GlobeNewswire | — | — | |
| Sienna Announces October Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Announces Third Quarter 2025 Results Release Date and Conference Call | Press release | GlobeNewswire | — | — | |
| Sienna Senior Living Completes Acquisition in Greater Toronto Area | Press release | GlobeNewswire | — | — | |
| Sienna Announces September Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Senior Living Announces the Opening of Its Long-Term Care Community in North Bay and Retirement Community in Brantford, Ontario | Press release | GlobeNewswire | — | — | |
| Sienna Announces Completion of $175 Million Offering of 4.112% Series E Senior Unsecured Debentures | Press release | GlobeNewswire | — | — | |
| Sienna Announces Offering of $175 Million of 4.112% Series E Senior Unsecured Debentures and Closing of Previously Announced Acquisition in Greater Toronto Area | Press release | GlobeNewswire | — | — | |
| Sienna Announces August Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Reports Second Quarter 2025 Financial Results and Publishes 2025 Impact Report | Press release | GlobeNewswire | — | — | |
| Sienna Announces Confirmation of DBRS Credit Rating | Press release | GlobeNewswire | — | — | |
| Sienna Announces July Dividend | Press release | GlobeNewswire | — | — | |
| Sienna Announces Second Quarter 2025 Results Release Date and Conference Call | Press release | GlobeNewswire | — | — |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the SIA_TSE section they belong to.
Where else SIA_TSE is measured.
SIA_TSE earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| FINCANNA CAPITAL CORP (FNNZF) | 102 | 0.00% | 32% |
| MAVEN BRANDS INC (TRLFF) | 102 | 0.00% | 46% |
| Mynd.ai, Inc. American Depositary Shares (MYND) | 100 | +0.52% | 58% |
| ARCA biopharma, Inc. (ABIO) | 99 | 0.00% | 48% |
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 →
Every ticker we measure the same way24
Apple (AAPL)
How AAPL actually reacts to news, measured.
NVIDIA (NVDA)
How NVDA actually reacts to news, measured.
Tesla (TSLA)
How TSLA actually reacts to news, measured.
Microsoft (MSFT)
How MSFT actually reacts to news, measured.
Advanced Micro Devices (AMD)
How AMD actually reacts to news, measured.
Amazon (AMZN)
How AMZN actually reacts to news, measured.
Alphabet (GOOG)
How GOOG actually reacts to news, measured.
Meta Platforms (META)
How META actually reacts to news, measured.
Broadcom (AVGO)
How AVGO actually reacts to news, measured.
JPMorgan Chase (JPM)
How JPM actually reacts to news, measured.
Visa (V)
How V actually reacts to news, measured.
Walmart (WMT)
How WMT actually reacts to news, measured.
Eli Lilly (LLY)
How LLY actually reacts to news, measured.
UnitedHealth Group (UNH)
How UNH actually reacts to news, measured.
Netflix (NFLX)
How NFLX actually reacts to news, measured.
Johnson & Johnson (JNJ)
How JNJ actually reacts to news, measured.
Exxon Mobil (XOM)
How XOM actually reacts to news, measured.
Home Depot (HD)
How HD actually reacts to news, measured.
Costco (COST)
How COST actually reacts to news, measured.
Mastercard (MA)
How MA actually reacts to news, measured.
Oracle (ORCL)
How ORCL actually reacts to news, measured.
Salesforce (CRM)
How CRM actually reacts to news, measured.
Bank of America (BAC)
How BAC actually reacts to news, measured.
Coca-Cola (KO)
How KO actually reacts to news, measured.
Walt Disney (DIS)
How DIS actually reacts to news, measured.
Browse all tickers
Every name we’ve measured, in one place.
How the numbers are made.
How is Sienna Senior Living Inc's median reaction calculated?
Every labeled SIA_TSE 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 101 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. 65% of SIA_TSE'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 SIA_TSE'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.