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Side-by-side financial comparison of PTC THERAPEUTICS, INC. (PTCT) and WILLIS LEASE FINANCE CORP (WLFC). Click either name above to swap in a different company.

WILLIS LEASE FINANCE CORP is the larger business by last-quarter revenue ($193.6M vs $164.7M, roughly 1.2× PTC THERAPEUTICS, INC.). On growth, WILLIS LEASE FINANCE CORP posted the faster year-over-year revenue change (26.7% vs -22.7%). WILLIS LEASE FINANCE CORP produced more free cash flow last quarter ($66.2M vs $-36.6M). Over the past eight quarters, WILLIS LEASE FINANCE CORP's revenue compounded faster (27.5% CAGR vs -11.5%).

PTC Therapeutics, Inc. is a US pharmaceutical company focused on the development of orally administered small molecule drugs and gene therapy which regulate gene expression by targeting post-transcriptional control (PTC) mechanisms in orphan diseases.

Willis Lease Finance Corp is a leading global independent provider of commercial aviation asset solutions. It primarily leases and sells commercial aircraft engines, auxiliary power units and other aviation spare parts, serving airline operators, MRO providers and other aviation industry participants across major global markets.

PTCT vs WLFC — Head-to-Head

Bigger by revenue
WLFC
WLFC
1.2× larger
WLFC
$193.6M
$164.7M
PTCT
Growing faster (revenue YoY)
WLFC
WLFC
+49.5% gap
WLFC
26.7%
-22.7%
PTCT
More free cash flow
WLFC
WLFC
$102.9M more FCF
WLFC
$66.2M
$-36.6M
PTCT
Faster 2-yr revenue CAGR
WLFC
WLFC
Annualised
WLFC
27.5%
-11.5%
PTCT

Income Statement — Q4 FY2025 vs Q4 FY2025

Metric
PTCT
PTCT
WLFC
WLFC
Revenue
$164.7M
$193.6M
Net Profit
$-135.0M
Gross Margin
Operating Margin
-43.3%
7.3%
Net Margin
-82.0%
Revenue YoY
-22.7%
26.7%
Net Profit YoY
-104.8%
EPS (diluted)
$-1.63
$1.50

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
PTCT
PTCT
WLFC
WLFC
Q4 25
$164.7M
$193.6M
Q3 25
$211.0M
$183.4M
Q2 25
$178.9M
$195.5M
Q1 25
$1.2B
$157.7M
Q4 24
$213.2M
$152.8M
Q3 24
$196.8M
$146.2M
Q2 24
$186.7M
$151.1M
Q1 24
$210.1M
$119.1M
Net Profit
PTCT
PTCT
WLFC
WLFC
Q4 25
$-135.0M
Q3 25
$15.9M
$24.3M
Q2 25
$-64.8M
$60.4M
Q1 25
$866.6M
$16.9M
Q4 24
$-65.9M
Q3 24
$-106.7M
$24.1M
Q2 24
$-99.2M
$42.6M
Q1 24
$-91.6M
$20.9M
Operating Margin
PTCT
PTCT
WLFC
WLFC
Q4 25
-43.3%
7.3%
Q3 25
1.4%
20.7%
Q2 25
-19.5%
14.5%
Q1 25
82.5%
15.2%
Q4 24
-76.2%
19.2%
Q3 24
-27.7%
23.0%
Q2 24
-21.5%
35.8%
Q1 24
-21.6%
22.9%
Net Margin
PTCT
PTCT
WLFC
WLFC
Q4 25
-82.0%
Q3 25
7.5%
13.3%
Q2 25
-36.3%
30.9%
Q1 25
73.7%
10.7%
Q4 24
-30.9%
Q3 24
-54.2%
16.5%
Q2 24
-53.1%
28.2%
Q1 24
-43.6%
17.5%
EPS (diluted)
PTCT
PTCT
WLFC
WLFC
Q4 25
$-1.63
$1.50
Q3 25
$0.20
$3.25
Q2 25
$-0.83
$8.43
Q1 25
$10.04
$2.21
Q4 24
$-0.85
$2.76
Q3 24
$-1.39
$3.37
Q2 24
$-1.29
$6.21
Q1 24
$-1.20
$3.00

Balance Sheet & Financial Strength

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

Metric
PTCT
PTCT
WLFC
WLFC
Cash + ST InvestmentsLiquidity on hand
$1.9B
$16.4M
Total DebtLower is stronger
$2.7B
Stockholders' EquityBook value
$-205.3M
$662.1M
Total Assets
$2.9B
$3.9B
Debt / EquityLower = less leverage
4.08×

8-quarter trend — quarters aligned by calendar period.

Cash + ST Investments
PTCT
PTCT
WLFC
WLFC
Q4 25
$1.9B
$16.4M
Q3 25
$1.7B
$12.9M
Q2 25
$2.0B
$37.3M
Q1 25
$2.0B
$32.4M
Q4 24
$1.1B
$9.1M
Q3 24
$1.0B
$5.8M
Q2 24
$1.1B
$5.0M
Q1 24
$884.8M
$7.6M
Total Debt
PTCT
PTCT
WLFC
WLFC
Q4 25
$2.7B
Q3 25
$2.2B
Q2 25
$2.8B
Q1 25
$2.2B
Q4 24
$2.3B
Q3 24
$2.0B
Q2 24
$1.9B
Q1 24
$1.7B
Stockholders' Equity
PTCT
PTCT
WLFC
WLFC
Q4 25
$-205.3M
$662.1M
Q3 25
$-155.8M
$650.2M
Q2 25
$-206.5M
$617.9M
Q1 25
$-185.8M
$565.5M
Q4 24
$-1.1B
$549.3M
Q3 24
$-1.1B
$517.8M
Q2 24
$-980.2M
$492.4M
Q1 24
$-893.9M
$461.8M
Total Assets
PTCT
PTCT
WLFC
WLFC
Q4 25
$2.9B
$3.9B
Q3 25
$2.6B
$3.4B
Q2 25
$2.6B
$3.9B
Q1 25
$2.7B
$3.3B
Q4 24
$1.7B
$3.3B
Q3 24
$1.8B
$3.0B
Q2 24
$1.9B
$2.9B
Q1 24
$1.8B
$2.7B
Debt / Equity
PTCT
PTCT
WLFC
WLFC
Q4 25
4.08×
Q3 25
3.44×
Q2 25
4.53×
Q1 25
3.95×
Q4 24
4.12×
Q3 24
3.84×
Q2 24
3.95×
Q1 24
3.76×

Cash Flow & Capital Efficiency

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

Metric
PTCT
PTCT
WLFC
WLFC
Operating Cash FlowLast quarter
$-34.3M
$74.2M
Free Cash FlowOCF − Capex
$-36.6M
$66.2M
FCF MarginFCF / Revenue
-22.3%
34.2%
Capex IntensityCapex / Revenue
1.4%
4.1%
Cash ConversionOCF / Net Profit
TTM Free Cash FlowTrailing 4 quarters
$702.3M
$252.2M

8-quarter trend — quarters aligned by calendar period.

Operating Cash Flow
PTCT
PTCT
WLFC
WLFC
Q4 25
$-34.3M
$74.2M
Q3 25
$-66.3M
$63.9M
Q2 25
$-58.3M
$104.2M
Q1 25
$870.1M
$41.0M
Q4 24
$-30.0M
$68.0M
Q3 24
$-77.0M
$86.8M
Q2 24
$-71.5M
$69.8M
Q1 24
$70.8M
$59.8M
Free Cash Flow
PTCT
PTCT
WLFC
WLFC
Q4 25
$-36.6M
$66.2M
Q3 25
$-69.7M
$57.8M
Q2 25
$-59.6M
$94.5M
Q1 25
$868.4M
$33.5M
Q4 24
$-33.8M
$55.1M
Q3 24
$-77.5M
$85.7M
Q2 24
$-78.8M
$68.5M
Q1 24
$61.2M
$59.4M
FCF Margin
PTCT
PTCT
WLFC
WLFC
Q4 25
-22.3%
34.2%
Q3 25
-33.1%
31.5%
Q2 25
-33.3%
48.4%
Q1 25
73.8%
21.3%
Q4 24
-15.8%
36.1%
Q3 24
-39.4%
58.6%
Q2 24
-42.2%
45.3%
Q1 24
29.1%
49.9%
Capex Intensity
PTCT
PTCT
WLFC
WLFC
Q4 25
1.4%
4.1%
Q3 25
1.6%
3.3%
Q2 25
0.7%
4.9%
Q1 25
0.1%
4.7%
Q4 24
1.8%
8.4%
Q3 24
0.3%
0.7%
Q2 24
4.0%
0.9%
Q1 24
4.6%
0.3%
Cash Conversion
PTCT
PTCT
WLFC
WLFC
Q4 25
Q3 25
-4.17×
2.63×
Q2 25
1.73×
Q1 25
1.00×
2.43×
Q4 24
Q3 24
3.60×
Q2 24
1.64×
Q1 24
2.87×

Financial Flow Comparison

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

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