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Side-by-side financial comparison of Amphastar Pharmaceuticals, Inc. (AMPH) and CSG SYSTEMS INTERNATIONAL INC (CSGS). Click either name above to swap in a different company.

CSG SYSTEMS INTERNATIONAL INC is the larger business by last-quarter revenue ($323.1M vs $183.1M, roughly 1.8× Amphastar Pharmaceuticals, Inc.). Amphastar Pharmaceuticals, Inc. runs the higher net margin — 13.3% vs 2.2%, a 11.2% gap on every dollar of revenue. On growth, CSG SYSTEMS INTERNATIONAL INC posted the faster year-over-year revenue change (2.0% vs -1.8%). CSG SYSTEMS INTERNATIONAL INC produced more free cash flow last quarter ($55.8M vs $24.6M). Over the past eight quarters, CSG SYSTEMS INTERNATIONAL INC's revenue compounded faster (4.6% CAGR vs 3.2%).

Amphastar Pharmaceuticals is a publicly traded American speciality pharmaceutical company. It was incorporated in May 2004 and primarily develops, manufactures, and sells inhalation and intranasal products.

CSG Holding Limited, formerly China Southern Glass Holding Limited, is the largest architectural glass manufacturer in China. It is involved in manufacturing and selling glass products, such as float glass, architectural glass, display glass, automotive glass, coated glass, mirrors, color filter glass, solar glass and conservation glass.

AMPH vs CSGS — Head-to-Head

Bigger by revenue
CSGS
CSGS
1.8× larger
CSGS
$323.1M
$183.1M
AMPH
Growing faster (revenue YoY)
CSGS
CSGS
+3.9% gap
CSGS
2.0%
-1.8%
AMPH
Higher net margin
AMPH
AMPH
11.2% more per $
AMPH
13.3%
2.2%
CSGS
More free cash flow
CSGS
CSGS
$31.2M more FCF
CSGS
$55.8M
$24.6M
AMPH
Faster 2-yr revenue CAGR
CSGS
CSGS
Annualised
CSGS
4.6%
3.2%
AMPH

Income Statement — Q4 FY2025 vs Q4 FY2025

Metric
AMPH
AMPH
CSGS
CSGS
Revenue
$183.1M
$323.1M
Net Profit
$24.4M
$7.0M
Gross Margin
46.8%
50.0%
Operating Margin
19.4%
9.0%
Net Margin
13.3%
2.2%
Revenue YoY
-1.8%
2.0%
Net Profit YoY
-35.7%
-79.7%
EPS (diluted)
$0.51
$0.24

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
AMPH
AMPH
CSGS
CSGS
Q4 25
$183.1M
$323.1M
Q3 25
$191.8M
$303.6M
Q2 25
$174.4M
$297.1M
Q1 25
$170.5M
$299.5M
Q4 24
$186.5M
$316.7M
Q3 24
$191.2M
$295.1M
Q2 24
$182.4M
$290.3M
Q1 24
$171.8M
$295.1M
Net Profit
AMPH
AMPH
CSGS
CSGS
Q4 25
$24.4M
$7.0M
Q3 25
$17.4M
$20.5M
Q2 25
$31.0M
$12.3M
Q1 25
$25.3M
$16.1M
Q4 24
$38.0M
$34.5M
Q3 24
$40.4M
$19.1M
Q2 24
$37.9M
$13.8M
Q1 24
$43.2M
$19.5M
Gross Margin
AMPH
AMPH
CSGS
CSGS
Q4 25
46.8%
50.0%
Q3 25
51.4%
48.1%
Q2 25
49.6%
49.5%
Q1 25
50.0%
48.4%
Q4 24
46.5%
51.3%
Q3 24
53.3%
49.4%
Q2 24
52.2%
47.3%
Q1 24
52.4%
46.5%
Operating Margin
AMPH
AMPH
CSGS
CSGS
Q4 25
19.4%
9.0%
Q3 25
13.2%
10.0%
Q2 25
24.2%
10.0%
Q1 25
21.9%
9.8%
Q4 24
24.2%
13.4%
Q3 24
29.8%
10.8%
Q2 24
30.3%
8.8%
Q1 24
27.9%
10.8%
Net Margin
AMPH
AMPH
CSGS
CSGS
Q4 25
13.3%
2.2%
Q3 25
9.0%
6.7%
Q2 25
17.8%
4.1%
Q1 25
14.8%
5.4%
Q4 24
20.4%
10.9%
Q3 24
21.1%
6.5%
Q2 24
20.8%
4.8%
Q1 24
25.1%
6.6%
EPS (diluted)
AMPH
AMPH
CSGS
CSGS
Q4 25
$0.51
$0.24
Q3 25
$0.37
$0.73
Q2 25
$0.64
$0.44
Q1 25
$0.51
$0.57
Q4 24
$0.74
$1.20
Q3 24
$0.78
$0.67
Q2 24
$0.73
$0.48
Q1 24
$0.81
$0.68

Balance Sheet & Financial Strength

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

Metric
AMPH
AMPH
CSGS
CSGS
Cash + ST InvestmentsLiquidity on hand
$282.8M
$180.0M
Total DebtLower is stronger
$608.7M
$539.5M
Stockholders' EquityBook value
$788.8M
$283.7M
Total Assets
$1.6B
$1.5B
Debt / EquityLower = less leverage
0.77×
1.90×

8-quarter trend — quarters aligned by calendar period.

Cash + ST Investments
AMPH
AMPH
CSGS
CSGS
Q4 25
$282.8M
$180.0M
Q3 25
$276.2M
$158.4M
Q2 25
$231.8M
$145.9M
Q1 25
$236.9M
$136.0M
Q4 24
$221.6M
$161.8M
Q3 24
$250.5M
$118.4M
Q2 24
$217.8M
$110.4M
Q1 24
$289.6M
$120.8M
Total Debt
AMPH
AMPH
CSGS
CSGS
Q4 25
$608.7M
$539.5M
Q3 25
$608.6M
$538.6M
Q2 25
$607.7M
$537.8M
Q1 25
$603.9M
$537.6M
Q4 24
$601.6M
$538.5M
Q3 24
$596.4M
$539.5M
Q2 24
$586.9M
$540.5M
Q1 24
$594.0M
$541.5M
Stockholders' Equity
AMPH
AMPH
CSGS
CSGS
Q4 25
$788.8M
$283.7M
Q3 25
$776.7M
$289.5M
Q2 25
$757.5M
$290.7M
Q1 25
$751.3M
$283.1M
Q4 24
$732.3M
$282.6M
Q3 24
$727.7M
$288.4M
Q2 24
$713.3M
$273.3M
Q1 24
$672.4M
$269.3M
Total Assets
AMPH
AMPH
CSGS
CSGS
Q4 25
$1.6B
$1.5B
Q3 25
$1.7B
$1.5B
Q2 25
$1.6B
$1.4B
Q1 25
$1.6B
$1.4B
Q4 24
$1.6B
$1.5B
Q3 24
$1.5B
$1.4B
Q2 24
$1.5B
$1.4B
Q1 24
$1.6B
$1.3B
Debt / Equity
AMPH
AMPH
CSGS
CSGS
Q4 25
0.77×
1.90×
Q3 25
0.78×
1.86×
Q2 25
0.80×
1.85×
Q1 25
0.80×
1.90×
Q4 24
0.82×
1.91×
Q3 24
0.82×
1.87×
Q2 24
0.82×
1.98×
Q1 24
0.88×
2.01×

Cash Flow & Capital Efficiency

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

Metric
AMPH
AMPH
CSGS
CSGS
Operating Cash FlowLast quarter
$32.9M
$59.2M
Free Cash FlowOCF − Capex
$24.6M
$55.8M
FCF MarginFCF / Revenue
13.4%
17.3%
Capex IntensityCapex / Revenue
4.5%
1.1%
Cash ConversionOCF / Net Profit
1.35×
8.46×
TTM Free Cash FlowTrailing 4 quarters
$121.2M
$141.4M

8-quarter trend — quarters aligned by calendar period.

Operating Cash Flow
AMPH
AMPH
CSGS
CSGS
Q4 25
$32.9M
$59.2M
Q3 25
$52.6M
$47.9M
Q2 25
$35.6M
$37.3M
Q1 25
$35.1M
$11.5M
Q4 24
$29.0M
$82.5M
Q3 24
$60.0M
$39.5M
Q2 24
$69.1M
$43.1M
Q1 24
$55.3M
$-29.4M
Free Cash Flow
AMPH
AMPH
CSGS
CSGS
Q4 25
$24.6M
$55.8M
Q3 25
$47.2M
$43.9M
Q2 25
$25.0M
$34.6M
Q1 25
$24.4M
$7.1M
Q4 24
$16.6M
$76.6M
Q3 24
$46.2M
$32.0M
Q2 24
$63.1M
$38.8M
Q1 24
$46.5M
$-34.1M
FCF Margin
AMPH
AMPH
CSGS
CSGS
Q4 25
13.4%
17.3%
Q3 25
24.6%
14.5%
Q2 25
14.3%
11.6%
Q1 25
14.3%
2.4%
Q4 24
8.9%
24.2%
Q3 24
24.1%
10.8%
Q2 24
34.6%
13.4%
Q1 24
27.1%
-11.6%
Capex Intensity
AMPH
AMPH
CSGS
CSGS
Q4 25
4.5%
1.1%
Q3 25
2.8%
1.3%
Q2 25
6.1%
0.9%
Q1 25
6.3%
1.5%
Q4 24
6.7%
1.9%
Q3 24
7.2%
2.5%
Q2 24
3.3%
1.5%
Q1 24
5.1%
1.6%
Cash Conversion
AMPH
AMPH
CSGS
CSGS
Q4 25
1.35×
8.46×
Q3 25
3.03×
2.34×
Q2 25
1.15×
3.04×
Q1 25
1.39×
0.71×
Q4 24
0.76×
2.39×
Q3 24
1.48×
2.07×
Q2 24
1.82×
3.12×
Q1 24
1.28×
-1.51×

Financial Flow Comparison

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

Revenue Breakdown by Segment

AMPH
AMPH

Other Products$62.4M34%
Baqsimi$46.7M26%
Primatenemist$27.9M15%
Epinephrine$17.1M9%
Lidocaine$14.9M8%
Glucagon$14.1M8%

CSGS
CSGS

Software As A Service And Related Solutions$287.2M89%
License And Service$22.6M7%
Maintenance$13.3M4%

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