220.98 USD
↗ 1.26 (0.57%)AFTER HOURS (AS OF Fri 04:00 PM EDT)
ALNY Stock After Hours
Alnylam Pharmaceuticals, Inc.
ALNYNASDAQ • USD
Market: OPEN
After-hours trading runs 4:00 PM – 8:00 PM ET.
ALNY last traded at $220.98 after hours, up $1.26 (0.57%) from its regular-session close of $219.72.
📅 ALNY is expected to report earnings around Oct 29, 2026 before the open (estimated), with an estimated EPS of $1.77. ALNY earnings details →
ALNY After Hours Chart
ALNY After Hours News
Gap Analytics — 5-year history, 5% minimum gap
Over the past 5 years, ALNY has had 20 qualifying gap events (gaps of 5% or more at the open) — 8 gap-ups and 12 gap-downs. Gap-ups averaged +15.6%, 63% have fully filled, median time to fill 1 trading day. Gap-downs averaged -8.2%, 50% have fully filled, median time to fill 7 trading days. Most recent: a -5.1% gap down on Aug 28, 2026, which filled in 1 trading day. Average 20-trading-day return after a ALNY gap up: -1.75%. After a gap down: -0.19%.
Gap Ups8 events
Fill Rate
62.5%
Avg Gap
15.6%
Avg 50% Fill
1d
Avg Fill
1d
Gap Downs12 events
Fill Rate
50.0%
Avg Gap
8.2%
Avg 50% Fill
1.5d
Avg Fill
7d
Avg Gap Fill by Timeframes
Gap Ups
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 75% | 88% | 88% | 88% |
| fills 50% | 50% | 63% | 63% | 63% |
| fills 75% | 38% | 63% | 63% | 63% |
| fills 100% | 38% | 63% | 63% | 63% |
Gap Downs
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 58% | 75% | 75% | 83% |
| fills 50% | 42% | 67% | 67% | 75% |
| fills 75% | 25% | 50% | 50% | 50% |
| fills 100% | 17% | 25% | 33% | 42% |
Complete Gap History — 20 events
| Date | Gap From | Gap % | Status | Days to 50% | Days to Fill | % of Gap Filled After | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 day | 1 week | 2 week | 4 week | ||||||
| 2026-08-28 | $236.56 | -5.11% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2026-07-30 | $286.62 | -21.49% | Open | 25d | — | 8% | 15% | 15% | 31% |
| 2026-07-09 | $323.50 | +17.00% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2026-01-12 | $398.29 | -5.14% | Open | — | — | 4% | 4% | 4% | 4% |
| 2025-10-30 | $481.59 | -6.56% | Open | 1d | — | 71% | 71% | 71% | 71% |
| 2025-04-08 | $232.95 | +5.67% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2024-08-30 | $287.01 | -7.32% | Filled | 13d | 32d | 34% | 34% | 34% | 66% |
| 2024-08-05 | $272.05 | -5.90% | Filled | 1d | 6d | 62% | 100% | 100% | 100% |
| 2024-08-01 | $237.46 | +5.28% | Open | — | — | 39% | 39% | 39% | 39% |
| 2024-06-24 | $165.70 | +32.39% | Open | — | — | 19% | 19% | 19% | 19% |
| 2024-02-15 | $164.15 | -8.62% | Open | 5d | — | 23% | 99% | 99% | 99% |
| 2023-09-14 | $211.65 | -5.50% | Open | — | — | 21% | 21% | 21% | 21% |
| 2023-07-17 | $197.10 | +5.53% | Filled | 1d | 6d | 56% | 100% | 100% | 100% |
| 2022-08-04 | $212.01 | -10.65% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2022-08-03 | $141.97 | +47.92% | Open | — | — | 18% | 31% | 31% | 31% |
| 2022-01-21 | $138.31 | -5.86% | Filled | 1d | 8d | 95% | 95% | 100% | 100% |
| 2022-01-20 | $138.62 | +5.44% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2021-12-22 | $199.59 | -5.24% | Open | 2d | — | 44% | 69% | 69% | 69% |
| 2021-11-18 | $172.73 | +5.53% | Filled | 2d | 2d | 40% | 100% | 100% | 100% |
| 2021-10-28 | $191.16 | -11.56% | Filled | 6d | 18d | 15% | 75% | 94% | 100% |
Frequently Asked Questions
What is ALNY's after-hours price?
Alnylam Pharmaceuticals (ALNY) is trading at $220.98 after hours, up $1.26 (0.57%) from its regular-session close of $219.72.
Why is ALNY moving after hours?
ALNY is up 0.57% in after-hours trading. Moves in this session almost always follow something released after the 4:00 PM ET close — an earnings report, guidance, a filing, or news — and trade on far thinner volume than the regular session, so the size of the move can overstate what the market will settle on at the next open.
When does ALNY after-hours trading start and end?
After-hours trading in ALNY on the NASDAQ runs from 4:00 PM to 8:00 PM ET on trading days, immediately after the regular session closes. Not every broker offers the full window, and liquidity thins sharply after about 6:30 PM ET.
Will ALNY's after-hours move hold at the open?
An after-hours move that carries into the next session becomes an opening gap, and ALNY's gap history is the best guide to what happens next: 63% of ALNY gap-ups have fully filled, and 50% of gap-downs have filled over the past 5 years. Fill rates this high mean a large after-hours move is more often faded than extended.
When does ALNY report earnings?
ALNY is expected to report earnings around Oct 29, 2026 before the open (estimated), with an estimated EPS of $1.77. Earnings are the most common cause of a large after-hours move, since most companies report after the close.