CSL (HAM:CSJ) Operating Margin %: 23.53% (As of Dec. 2025) — 13% Above Median

CSL  (HAM:CSJ) Operating Margin % Explanation

Just like Gross Margin %, it is important to see a company maintains its operating margin over time. Among the same industry, a company with higher operating margin is more efficient in its operation. It is also more stable during industry slowdown or recessions. Peter Lynch prefers those with higher margins than those with lower margins.

Be Aware

Operating Margin % can be manipulated by adjusting the rate of depreciation, depletion and amortization (DDA).

If a company is facing competition, its Operating Margin % may decline. Often the Operating Margin % declines well before the company's Revenue or even profit decline. Therefore, Operating Margin % is a very important indicator of whether the company is facing problems.

For instance, by 2012, Nokia (NOK)'s problems were well known and its stock had lost more than 90% of its market value since 2007. But Nokia’s Operating Margin % had already been in decline since 2002, although its Earnings per Share (Diluted) were still rising. Investors who paid attention to Operating Margin % would have avoided this huge loss. The same can be said for Research-in-Motion (RIMM).

Therefore, Operating Margin % is a very important screening filter for GuruFocus. GuruFocus's Buffett-Munger screener requires that the profit margin is either consistent or expanding. The Model Portfolio of the Buffett-Munger screener has outperformed the market every year since inception in 2009.

CSL Operating Margin % Related Terms

The historical data trend for CSL's Operating Margin % can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

CSL Operating Margin % Chart

CSL Annual Data
	Trend	Jun16	Jun17	Jun18	Jun19	Jun20	Jun21	Jun22	Jun23	Jun24	Jun25
Operating Margin %		Get a 7-Day Free Trial					25.23	22.07	15.96	18.82	19.18

CSL Semi-Annual Data
	Dec15	Jun16	Dec16	Jun17	Dec17	Jun18	Dec18	Jun19	Dec19	Jun20	Dec20	Jun21	Dec21	Jun22	Dec22	Jun23	Dec23	Jun24	Jun25	Dec25
Operating Margin %	Get a 7-Day Free Trial															9.47	24.79	12.04	0.00	23.53

HAM:CSJ vs VRTX, REGN, ALNY: Operating Margin % Comparison

For the Biotechnology subindustry, CSL's Operating Margin %, along with its competitors' market caps and Operating Margin % data, can be viewed below:

* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.

CSL Operating Margin % vs Biotechnology Industry

For the Biotechnology industry and Healthcare sector, CSL's Operating Margin % distribution charts can be found below:

* The bar in red indicates where CSL's Operating Margin % falls into.

CSL Operating Margin % Calculation

Operating Margin % - also known as operating income margin, operating profit margin and return on sales (ROS) - is the ratio of Operating Income divided by net sales or Revenue, usually presented in percent.

CSL's Operating Margin % for the fiscal year that ended in Jun. 2025 is calculated as

CSL's Operating Margin % for the quarter that ended in Dec. 2025 is calculated as

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

CSL Business Description