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Side-by-side financial comparison of Biogen (BIIB) and First Solar (FSLR). Click either name above to swap in a different company.

Biogen is the larger business by last-quarter revenue ($2.5B vs $1.0B, roughly 2.4× First Solar). First Solar runs the higher net margin — 33.2% vs 12.9%, a 20.3% gap on every dollar of revenue. On growth, First Solar posted the faster year-over-year revenue change (23.6% vs 2.0%). Over the past eight quarters, First Solar's revenue compounded faster (1.7% CAGR vs 0.3%).

Biogen Inc. is an American multinational biotechnology company based in Cambridge, Massachusetts, United States specializing in the treatment of neurological diseases. The company's primary products are dimethyl fumarate (Tecfidera), diroximel fumarate (Vumerity), interferon beta-1a (AVONEX), peginterferon beta-1a (Plegridy), and natalizumab (Tysabri), all for the treatment of multiple sclerosis ; nusinersen (Spinraza) for the treatment of spinal muscular atrophy ; omaveloxolone (Skyclarys) for ...

First Solar, Inc. is a publicly traded American manufacturer of solar panels. First Solar uses rigid thin-film modules for its solar panels, and produces CdTe panels using cadmium telluride (CdTe) as a semiconductor. The company was founded in 1990 by inventor Harold McMaster as Solar Cells, Inc. In 1999 it was purchased by True North Partners, LLC, which rebranded it as First Solar, Inc. It provides end-of-life panel recycling at each of its manufacturing facilities.

BIIB vs FSLR — Head-to-Head

Bigger by revenue
BIIB
BIIB
2.4× larger
BIIB
$2.5B
$1.0B
FSLR
Growing faster (revenue YoY)
FSLR
FSLR
+21.6% gap
FSLR
23.6%
2.0%
BIIB
Higher net margin
FSLR
FSLR
20.3% more per $
FSLR
33.2%
12.9%
BIIB
Faster 2-yr revenue CAGR
FSLR
FSLR
Annualised
FSLR
1.7%
0.3%
BIIB

Income Statement — Q1 FY2026 vs Q1 FY2026

Metric
BIIB
BIIB
FSLR
FSLR
Revenue
$2.5B
$1.0B
Net Profit
$319.5M
$346.6M
Gross Margin
46.6%
Operating Margin
33.1%
Net Margin
12.9%
33.2%
Revenue YoY
2.0%
23.6%
Net Profit YoY
32.8%
65.4%
EPS (diluted)
$2.15
$3.22

Green = leading value per metric. Periods may differ when fiscal calendars don't align.

8-Quarter Revenue & Profit Trend

Side-by-side quarterly history. Quarters aligned by calendar period so offset fiscal years line up.

Revenue
BIIB
BIIB
FSLR
FSLR
Q1 26
$2.5B
$1.0B
Q4 25
$2.3B
$1.7B
Q3 25
$2.5B
$1.6B
Q2 25
$2.6B
$1.1B
Q1 25
$2.4B
$844.6M
Q4 24
$2.5B
$1.5B
Q3 24
$2.5B
$887.7M
Q2 24
$2.5B
$1.0B
Net Profit
BIIB
BIIB
FSLR
FSLR
Q1 26
$319.5M
$346.6M
Q4 25
$-48.9M
$520.9M
Q3 25
$466.5M
$455.9M
Q2 25
$634.8M
$341.9M
Q1 25
$240.5M
$209.5M
Q4 24
$266.7M
$393.1M
Q3 24
$388.5M
$313.0M
Q2 24
$583.6M
$349.4M
Gross Margin
BIIB
BIIB
FSLR
FSLR
Q1 26
46.6%
Q4 25
78.3%
39.5%
Q3 25
73.4%
38.3%
Q2 25
77.1%
45.6%
Q1 25
74.1%
40.8%
Q4 24
76.2%
37.5%
Q3 24
74.1%
50.2%
Q2 24
77.8%
49.4%
Operating Margin
BIIB
BIIB
FSLR
FSLR
Q1 26
33.1%
Q4 25
-2.5%
32.6%
Q3 25
22.0%
29.2%
Q2 25
28.1%
33.0%
Q1 25
12.8%
26.2%
Q4 24
11.9%
30.2%
Q3 24
18.3%
36.3%
Q2 24
28.3%
36.9%
Net Margin
BIIB
BIIB
FSLR
FSLR
Q1 26
12.9%
33.2%
Q4 25
-2.1%
31.0%
Q3 25
18.4%
28.6%
Q2 25
24.0%
31.2%
Q1 25
9.9%
24.8%
Q4 24
10.9%
26.0%
Q3 24
15.8%
35.3%
Q2 24
23.7%
34.6%
EPS (diluted)
BIIB
BIIB
FSLR
FSLR
Q1 26
$2.15
$3.22
Q4 25
$-0.35
$4.84
Q3 25
$3.17
$4.24
Q2 25
$4.33
$3.18
Q1 25
$1.64
$1.95
Q4 24
$1.82
$3.66
Q3 24
$2.66
$2.91
Q2 24
$4.00
$3.25

Balance Sheet & Financial Strength

Snapshot of each company's liquidity, leverage and book value from the latest quarter.

Metric
BIIB
BIIB
FSLR
FSLR
Cash + ST InvestmentsLiquidity on hand
$3.4B
$2.4B
Total DebtLower is stronger
$425.8M
Stockholders' EquityBook value
$18.7B
$9.9B
Total Assets
$29.5B
$13.4B
Debt / EquityLower = less leverage
0.04×

8-quarter trend — quarters aligned by calendar period.

Cash + ST Investments
BIIB
BIIB
FSLR
FSLR
Q1 26
$3.4B
$2.4B
Q4 25
$2.8B
Q3 25
$2.0B
Q2 25
$1.1B
Q1 25
$837.6M
Q4 24
$1.6B
Q3 24
$1.0B
Q2 24
$1.7B
Total Debt
BIIB
BIIB
FSLR
FSLR
Q1 26
$425.8M
Q4 25
$6.3B
Q3 25
$6.3B
Q2 25
$6.3B
Q1 25
$4.5B
Q4 24
$6.3B
Q3 24
$4.5B
Q2 24
$6.3B
Stockholders' Equity
BIIB
BIIB
FSLR
FSLR
Q1 26
$18.7B
$9.9B
Q4 25
$18.3B
$9.5B
Q3 25
$18.2B
$9.0B
Q2 25
$17.6B
$8.5B
Q1 25
$17.0B
$8.2B
Q4 24
$16.7B
$8.0B
Q3 24
$16.4B
$7.6B
Q2 24
$15.9B
$7.3B
Total Assets
BIIB
BIIB
FSLR
FSLR
Q1 26
$29.5B
$13.4B
Q4 25
$29.4B
$13.3B
Q3 25
$29.2B
$13.5B
Q2 25
$28.3B
$12.9B
Q1 25
$28.0B
$12.1B
Q4 24
$28.0B
$12.1B
Q3 24
$28.3B
$11.4B
Q2 24
$26.8B
$11.0B
Debt / Equity
BIIB
BIIB
FSLR
FSLR
Q1 26
0.04×
Q4 25
0.34×
Q3 25
0.35×
Q2 25
0.36×
Q1 25
0.27×
Q4 24
0.38×
Q3 24
0.28×
Q2 24
0.40×

Cash Flow & Capital Efficiency

How much cash each business actually produces after reinvestment. Cash flow is harder to manipulate than net income.

Metric
BIIB
BIIB
FSLR
FSLR
Operating Cash FlowLast quarter
$-214.9M
Free Cash FlowOCF − Capex
$594.3M
FCF MarginFCF / Revenue
24.0%
Capex IntensityCapex / Revenue
Cash ConversionOCF / Net Profit
-0.62×
TTM Free Cash FlowTrailing 4 quarters
$2.4B

8-quarter trend — quarters aligned by calendar period.

Operating Cash Flow
BIIB
BIIB
FSLR
FSLR
Q1 26
$-214.9M
Q4 25
$511.9M
$1.2B
Q3 25
$1.3B
$1.3B
Q2 25
$160.9M
$149.6M
Q1 25
$259.3M
$-608.0M
Q4 24
$760.9M
$811.0M
Q3 24
$935.6M
$-53.7M
Q2 24
$625.8M
$193.0M
Free Cash Flow
BIIB
BIIB
FSLR
FSLR
Q1 26
$594.3M
Q4 25
$468.0M
$1.1B
Q3 25
$1.2B
$1.1B
Q2 25
$134.3M
$-138.6M
Q1 25
$222.2M
$-813.9M
Q4 24
$721.6M
$497.5M
Q3 24
$900.6M
$-487.7M
Q2 24
$592.3M
$-172.1M
FCF Margin
BIIB
BIIB
FSLR
FSLR
Q1 26
24.0%
Q4 25
20.5%
63.6%
Q3 25
48.4%
67.1%
Q2 25
5.1%
-12.6%
Q1 25
9.1%
-96.4%
Q4 24
29.4%
32.9%
Q3 24
36.5%
-54.9%
Q2 24
24.0%
-17.0%
Capex Intensity
BIIB
BIIB
FSLR
FSLR
Q1 26
Q4 25
1.9%
10.2%
Q3 25
1.8%
12.8%
Q2 25
1.0%
26.3%
Q1 25
1.5%
24.4%
Q4 24
1.6%
20.7%
Q3 24
1.4%
48.9%
Q2 24
1.4%
36.1%
Cash Conversion
BIIB
BIIB
FSLR
FSLR
Q1 26
-0.62×
Q4 25
2.38×
Q3 25
2.73×
2.79×
Q2 25
0.25×
0.44×
Q1 25
1.08×
-2.90×
Q4 24
2.85×
2.06×
Q3 24
2.41×
-0.17×
Q2 24
1.07×
0.55×

Financial Flow Comparison

Revenue → gross profit → operating profit → net profit for each company.

Revenue Breakdown by Segment

BIIB
BIIB

Product revenue, net$1.8B71%
Royalty revenue on sales of OCREVUS$317.2M13%
Contract manufacturing, royalty and other revenue$246.9M10%
Biogen's share of pre-tax profits in the U.S. for RITUXAN, GAZYVA and LUNSUMIO$94.7M4%
Alzheimer's collaboration Revenue$59.5M2%
Other revenue from anti-CD20 therapeutic programs$7.2M0%

FSLR
FSLR

Segment breakdown not available.

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