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Operating

Inventory write-downs

Biogen Inventory write-downs decreased by 68.6% to $4.8M in Q1 2026 compared to the prior quarter. Year-over-year, this metric declined by 34.2%, from $7.3M to $4.8M. Over 4 years (FY 2021 to FY 2025), Inventory write-downs shows a downward trend with a -35.5% CAGR.

Analysis

StatementCash Flow Statement
SectionOperating
First reportedQ1 2019
Last reportedQ1 2026Apr 29, 2026
Metric ID: operating_inventory_write_down

Historical Data

20 periods
 Q2 '21Q3 '21Q4 '21Q1 '22Q2 '22Q3 '22Q4 '22Q1 '23Q2 '23Q3 '23Q4 '23Q1 '24Q2 '24Q3 '24Q4 '24Q1 '25Q2 '25Q3 '25Q4 '25Q1 '26
Value$0$28.2M$131.1M$281.5M$24.1M$16M$14.6M$17.4M$19.4M$25.3M$62.3M$27.5M$16.9M$24.3M$33.2M$7.3M$7M$0$15.3M$4.8M
QoQ Change+364.9%+114.7%-91.4%-33.6%-8.8%+19.2%+11.5%+30.4%+146.2%-55.9%-38.5%+43.8%+36.6%-78.0%-4.1%-100.0%-68.6%
YoY Change-43.3%-88.9%-93.8%-19.5%+58.1%+326.7%+58.0%-12.9%-4.0%-46.7%-73.5%-58.6%-100.0%-53.9%-34.2%
Range$0$281.5M
Avg YoY Growth-12.4%
Median YoY Growth-43.3%
Current Streak5 quarters decline

Product Breakdown

View all
SegmentQ2 '22
ADUHELM$275M
Total$24.1M

Frequently Asked Questions

What is Biogen's inventory write-downs?
Biogen (BIIB) reported inventory write-downs of $4.8M in Q1 2026.
How has Biogen's inventory write-downs changed year-over-year?
Biogen's inventory write-downs decreased by 34.2% year-over-year, from $7.3M to $4.8M.
What is the long-term trend for Biogen's inventory write-downs?
Over 4 years (2021 to 2025), Biogen's inventory write-downs has grown at a -35.5% compound annual growth rate (CAGR), from $171.2M to $29.6M.