Borsa Italiana · 1ALNY · stock
Alnylam Pharmaceuticals, Inc. (1ALNY) stock price history
Every Borsa Italiana trading session of Alnylam Pharmaceuticals, Inc. from May 5, 2025 to Sep 25, 2026: 356 daily bars, adjusted for splits and dividends, with minute bars from Sep 17, 2026 forward. The full series is served by the API: a free key covers the last year, paid plans the whole history and minute bars.
1ALNY adjusted close, 2025 to 2026
- €406.90
- All time high, 2025
- €406.90
- 52 week high, €177.30 low
- 356
- Daily sessions since 2025
Last updated Sep 25, 2026, the last stored session. Refreshes after each trading day. Full 2025 to 2026 series and minute bars.
1ALNY key facts
- Alnylam Pharmaceuticals, Inc. (1ALNY) closed at €221.40 on Sep 25, 2026 on Borsa Italiana.
- 1ALNY's all time high close is €406.90, set on Nov 18, 2025; its all time low close is €177.30 on Jul 30, 2026.
- 1ALNY's 52 week range is €177.30 to €406.90.
- 1ALNY returned -17.6% over the year to Sep 25, 2026.
- Since May 5, 2025 1ALNY returned -6%, -4.6% a year compounded.
- 1ALNY's deepest drawdown was -56.4% from Dec 17, 2025 to Jul 30, 2026.
- DataCedar holds 356 daily sessions of 1ALNY history from May 5, 2025 and minute bars from Sep 17, 2026, adjusted for splits and dividends, served by the API under a key.
1ALNY price chart, 2025 to 2026
1ALNY returns
Price return from the last close on or before the window start to Sep 25, 2026, on adjusted closes.
| Period | Return |
|---|---|
| 1 month | +9.0% |
| 3 months | -12.2% |
| 6 months | -18.7% |
| Year to date | -34.8% |
| 1 year | -17.6% |
| 3 years | n/a |
| 5 years | n/a |
| 10 years | n/a |
| Since May 5, 2025 | -6.4% |
| Compound annual growth, 1.4 years | -4.6% |
1ALNY records
Measured on the stored closes; every figure is reproducible from the API series.
- All time high close
- €406.90 on Nov 18, 2025
- All time low close
- €177.30 on Jul 30, 2026
- 52 week high
- €406.90 on Nov 18, 2025
- 52 week low
- €177.30 on Jul 30, 2026
- Deepest drawdown
- -56.4% from Dec 17, 2025 to Jul 30, 2026, not yet recovered
- Best single session
- +45.5% on Oct 31, 2025
- Worst single session
- -24.5% on Jul 30, 2026
- Volatility, 1 year annualised
- 66.9%
- Sessions closing higher, 1 year
- 16%
1ALNY price history by year
Open is the first session's open, high and low span the year, close is the last session's close, and the return is close over the previous year's close. 2025 starts on May 5, 2025; 2026 runs to Sep 25, 2026.
| Year | Open | High | Low | Close | Return | Volume | Sessions |
|---|---|---|---|---|---|---|---|
| 2026 | €339.50 | €372.30 | €177.85 | €221.40 | -34.8% | 6.7K | 188 |
| 2025 | €230.00 | €406.90 | €226.10 | €339.50 | n/a | 140 | 168 |
1ALNY monthly closes, last 12 months
| Month | Month end close | Change |
|---|---|---|
| September 2026 | €221.40 | +7.3% |
| August 2026 | €206.40 | +15.9% |
| July 2026 | €178.15 | -29.4% |
| June 2026 | €252.20 | -2.1% |
| May 2026 | €257.50 | -4.5% |
| April 2026 | €269.50 | -3.0% |
| March 2026 | €277.90 | -1.7% |
| February 2026 | €282.60 | -7.9% |
| January 2026 | €306.80 | -9.6% |
| December 2025 | €339.50 | -16.6% |
| November 2025 | €406.90 | +4.0% |
| October 2025 | €391.10 | +45.5% |
About the 1ALNY data
Daily bars. 356 sessions from May 5, 2025 to Sep 25, 2026, one row per Borsa Italiana trading day with open, high, low, close and volume. Prices are adjusted for splits and cash dividends so the series is comparable across its whole length; the API also serves the raw, split only and dividend only views.
Minute bars. Stored from Sep 17, 2026 forward, most recent session Sep 25, 2026. Minute history is captured from the day collection began and is never backfilled, so this start date is exact. Five minute, fifteen minute and hourly bars are derived from these minutes.
Time and currency. Session dates are Borsa Italiana trading days; minute timestamps are UTC. Prices are in EUR. Volume is shares traded on the session.
Get the data. The REST endpoint returns the daily series as JSON with pagination; a free key serves the last year, Quant and above the full history back to May 5, 2025, and minute bars come with the paid windows. It takes timeframe (1Min, 5Min, 15Min, 1Hour, 1Day), adjustment, start and end. See the bars endpoint and authentication, and pricing for the plan windows.
curl "https://api.datacedar.com/v3/stocks/1ALNY/bars?timeframe=1Day&adjustment=all&limit=50000" \
-H "X-API-Key: YOUR_KEY"Nearby on Borsa Italiana
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Common questions
1ALNY share price history
