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Alnylam Pharmaceuticals, Inc. logo

Alnylam Pharmaceuticals, Inc. (ALNY) stock

ALNYNasdaqPharmaceutical PreparationsFiscal year ends December 31
Financials through Q3 FY2026, quarter ended Sep 30, 2026Last filing: 10-Q on Oct 29, 2026Score 7/30
$165.00−9.00 (-5.17%)

Close on Oct 30, 2026Market cap $22.08BP/E –Yield –

Price history

Alnylam Pharmaceuticals share prices for every week, newest first. Adjusted for stock splits, not for dividends.

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Close, Oct 30, 2026
$165.00
-5.17% on the day
52-week range
$163.30 – $479.79
-65.6% from the high
Change over 52 weeks
-63.3%
From $449.56 on Oct 30, 2025
Average volume
1.87M
Shares a day, last 90 sessions
Week ofOpenHighLowCloseChangeVolume
Oct 26, 2026$226.24$232.88$163.30$165.00-26.35%23,844,200
Oct 19, 2026$232.65$238.96$222.00$224.03-3.36%7,298,489
Oct 12, 2026$233.13$237.98$221.56$231.83-0.37%5,803,931
Oct 5, 2026$218.36$232.94$215.46$232.68+5.90%6,432,728
Sep 28, 2026$256.28$257.27$219.40$219.72-14.16%6,658,627
Sep 21, 2026$240.37$256.66$237.97$255.96+6.85%5,784,805
Sep 14, 2026$250.17$252.79$236.00$239.56-3.67%7,789,033
Sep 8, 2026$259.00$272.08$246.01$248.68-6.55%6,238,799
Aug 31, 2026$235.94$271.19$233.33$266.11+12.24%10,005,248
Aug 24, 2026$235.83$242.89$223.61$237.10+0.37%7,970,540
Aug 17, 2026$225.76$244.03$222.01$236.22+3.31%8,626,961
Aug 10, 2026$218.00$228.98$215.61$228.65+4.31%7,439,677
Aug 3, 2026$208.04$234.00$208.04$219.20+6.66%13,253,188
Jul 27, 2026$272.66$290.60$197.81$205.52-24.38%18,462,287
Jul 20, 2026$267.55$278.30$262.21$271.77+1.61%5,739,042
Jul 13, 2026$298.01$298.76$266.43$267.47-10.47%7,875,821
Jul 6, 2026$319.34$380.00$293.78$298.76-4.48%11,173,356
Jun 29, 2026$296.97$317.17$291.90$312.78+7.35%4,943,060
Jun 22, 2026$278.42$303.46$278.17$291.37+4.78%6,426,979
Jun 15, 2026$282.92$288.48$273.11$278.09-1.68%5,858,793
Jun 8, 2026$303.11$303.57$281.77$282.85-6.67%6,320,398
Jun 1, 2026$299.51$310.53$283.10$303.05+0.35%5,303,581
May 26, 2026$299.00$305.98$291.84$301.98+1.52%4,578,092
May 18, 2026$287.14$303.33$284.38$297.45+3.65%3,774,614
May 11, 2026$294.15$298.38$284.28$286.98-2.74%5,129,131
May 4, 2026$298.00$306.03$288.06$295.05-0.36%5,497,541
Apr 27, 2026$303.87$317.56$287.00$296.11-3.09%6,984,611
Apr 20, 2026$306.56$315.83$301.63$305.54-1.33%4,895,044
Apr 13, 2026$320.66$343.36$306.00$309.66-3.87%5,513,695
Apr 6, 2026$320.10$335.58$313.54$322.11+1.02%5,424,527
Mar 30, 2026$319.32$335.48$314.21$318.85+0.47%4,121,984
Mar 23, 2026$320.77$332.81$299.62$317.36+1.66%5,951,629
Mar 16, 2026$311.22$326.96$309.73$312.17-0.40%6,836,427
Mar 9, 2026$317.25$326.18$309.61$313.41-2.26%5,233,761
Mar 2, 2026$329.41$334.42$312.09$320.66-3.68%5,392,777
Feb 23, 2026$335.73$341.39$322.00$332.92-0.97%4,785,478
Feb 17, 2026$316.80$345.90$315.63$336.19+6.93%5,195,841
Feb 9, 2026$325.49$329.92$298.00$314.40-4.19%9,213,984
Feb 2, 2026$337.42$355.49$326.51$328.16-2.93%9,941,364
Jan 26, 2026$357.98$368.07$336.39$338.06-5.56%6,354,245
Jan 20, 2026$350.70$376.87$347.77$357.98-0.36%6,758,322
Jan 12, 2026$377.82$378.61$353.52$359.27-9.80%9,122,334
Jan 5, 2026$397.57$427.05$383.84$398.29-0.47%6,974,118
Dec 29, 2025$400.10$407.22$393.64$400.17-0.10%2,642,541
Dec 22, 2025$409.60$413.59$395.05$400.59+0.09%2,654,966
Dec 15, 2025$394.22$408.15$388.54$400.23+0.67%18,161,782
Dec 8, 2025$447.00$449.78$387.03$397.55-13.22%8,155,085
Dec 1, 2025$450.00$479.79$448.27$458.12+1.53%4,979,100
Nov 24, 2025$439.46$455.76$420.30$451.23+3.40%4,231,614
Nov 17, 2025$449.00$469.11$433.50$436.38-2.85%4,610,354
Nov 10, 2025$445.00$461.96$440.93$449.16+1.46%4,425,908
Nov 3, 2025$454.58$457.26$417.00$442.70-2.93%5,224,509

Seasonality

ALNY return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average0.6%0.0%1.2%-3.1%1.0%14.6%-0.2%12.9%0.7%-7.5%8.7%-2.5%
Months up5 of 104 of 104 of 102 of 106 of 108 of 105 of 109 of 105 of 104 of 107 of 93 of 9
2026-15.0%-1.5%-0.6%-6.5%-2.4%-0.3%-31.7%17.1%2.5%-33.1%
202515.3%-9.1%9.4%-2.5%15.7%7.1%20.3%13.8%2.1%0.0%-1.1%-11.9%
2024-9.7%-12.6%-1.1%-3.7%3.1%63.7%-2.3%10.6%4.7%-3.1%-5.1%-7.0%
2023-4.7%-15.4%4.6%-0.6%-7.1%2.7%2.9%1.2%-10.5%-14.3%10.8%13.8%
2022-18.9%14.7%3.4%-18.3%-5.7%15.9%-2.6%45.5%-3.1%3.5%6.4%7.7%
202115.8%-1.6%-4.7%-0.4%1.0%19.4%5.6%12.6%-6.3%-15.5%15.2%-7.7%
2020-0.3%2.5%-7.5%21.0%2.7%9.5%-1.6%-9.0%9.8%-15.5%5.6%0.0%
201914.6%1.8%9.9%-4.4%-24.4%7.5%6.9%4.0%-0.3%7.9%35.0%-1.7%
20182.3%-7.6%-0.9%-20.6%5.2%-1.0%-3.5%29.1%-28.7%-8.1%0.9%-10.2%
20176.8%29.1%-0.8%4.6%22.1%21.8%3.7%3.6%37.0%3.7%10.4%-5.6%