Biogen Inc (BIIB) stock chart and technical analysis

Indicator summary: Leaning bullish (3 bullish, 1 bearish, 1 neutral). As of 2026-09-18, the close was $215.50: 2.3% above the 50-day average and 11.7% above the 200-day average, which is rising. RSI (14) is 50, in its neutral range. MACD is bearish after a cross in the last 10 days. The stock sits 89% of the way up its 52-week range of $135.39 to $225.80, on 3.7x its 20-day average volume.

Indicator	Reading	Read
50-day average	$210.56	Price 2.3% above
200-day average	$192.84	Price 11.7% above, average rising
50 vs 200-day	50 above 200	Golden-cross alignment
RSI (14)	50	Neutral range
MACD (12, 26, 9)	+1.41 vs +2.05	Bearish cross in the last 10 days
52-week range	$135.39 to $225.80	89% of the way up the range
Volume vs 20-day average	3.7x	Heavy

What followed this setup for BIIB

When it closed above its 200-day average (3,738 days), it was higher 63 trading days later 54% of the time, median +1.7%.
When it closed above its 50-day average (3,685 days), it was higher 63 trading days later 54% of the time, median +1.7%.
When it had MACD below its signal line (3,310 days), it was higher 63 trading days later 57% of the time, median +2.7%.
All days since 1999 (6,698 days): higher 63 trading days later 56% of the time, median +2.4%.

Base rates use BIIB's own daily history since 1999; they describe the past, not a forecast.

ŷRobot chart signal: Bearish, from the chart signal model.

BIIB analysis: AI score, fair value and forecast · Is it a bull or a bear market today? · All covered stocks

ŷRobot analysis is AI-generated and quality-gated; nothing here is investment advice.