Formosa Optical Technology Co (ROCO:5312) FCF Margin %: 19.83% (As of Dec. 2025) — 41% Above Median


ROCO:5312 Formosa Optical Technology Co Ltd ROCO:5312
81 GF Score
Price NT$89.70
GF Value NT$108.45
Valuation Modestly Undervalued
! 4 Warning Signs
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What is Formosa Optical Technology Co FCF Margin %?

Formosa Optical Technology Co ROCO:5312 -0.66% 81 FCF Margin % is 19.83% as of Dec. 2025, which is 41% above its 10-year median of 14.09. GuruFocus rates ROCO:5312 with a GF Score™ of 81/100 and a GF Value™ of NT$108.45 (Modestly Undervalued). The stock has 4 warning signs investors should review. Among 816 Medical Devices & Instruments companies, Formosa Optical Technology Co ranks better than 80.15% on this metric.

FCF Margin % is calculated as Free Cash Flow divided by its Revenue. Formosa Optical Technology Co's Free Cash Flow for the three months ended in Dec. 2025 was NT$223 Mil. Formosa Optical Technology Co's Revenue for the three months ended in Dec. 2025 was NT$1,127 Mil. Therefore, Formosa Optical Technology Co's FCF Margin % for the quarter that ended in Dec. 2025 was 19.83%.

As of today, Formosa Optical Technology Co's current FCF Yield % is 9.86%.

The historical rank and industry rank for Formosa Optical Technology Co's FCF Margin % or its related term are showing as below:

ROCO:5312' s FCF Margin % Range Over the Past 10 Years
Min: 9.52   Med: 14.09   Max: 18.72
Current: 12.87


During the past 13 years, the highest FCF Margin % of Formosa Optical Technology Co was 18.72%. The lowest was 9.52%. And the median was 14.09%.

ROCO:5312's FCF Margin % is ranked better than
80.15% of 816 companies
in the Medical Devices & Instruments industry
Industry Median: -0.22 vs ROCO:5312: 12.87


Formosa Optical Technology Co FCF Margin % Related Terms


Formosa Optical Technology Co FCF Margin % Historical Data

* Premium members only.

The historical data trend for Formosa Optical Technology Co's FCF 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.

Formosa Optical Technology Co FCF Margin % Chart

Formosa Optical Technology Co Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
FCF Margin %
Get a 7-Day Free Trial Premium Member Only Premium Member Only 18.72 16.84 17.29 14.68 12.87

Formosa Optical Technology Co Quarterly Data
Mar21 Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25
FCF Margin % Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only 21.82 20.92 2.14 7.47 19.83

ROCO:5312 vs ISRG, BDX, MDLN: FCF Margin % Comparison

For the Medical Instruments & Supplies subindustry, Formosa Optical Technology Co's FCF Margin %, along with its competitors' market caps and FCF 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.


Formosa Optical Technology Co FCF Margin % vs Medical Devices & Instruments Industry

For the Medical Devices & Instruments industry and Healthcare sector, Formosa Optical Technology Co's FCF Margin % distribution charts can be found below:

* The bar in red indicates where Formosa Optical Technology Co's FCF Margin % falls into.


ROCO:5312
81GF Score
Formosa Optical Technology Co Ltd ROCO:5312
FCF Margin % is just one metric. See GF Score™, valuation, warning signs, and more.
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Formosa Optical Technology Co FCF Margin % Calculation

FCF margin is the ratio of Free Cash Flow divided by net sales or Revenue, usually presented in percent.

Formosa Optical Technology Co's FCF Margin for the fiscal year that ended in Dec. 2025 is calculated as

FCF Margin=Free Cash Flow (A: Dec. 2025 )/Revenue (A: Dec. 2025 )
=531.151/4128.599
=12.87 %

Formosa Optical Technology Co's FCF Margin for the quarter that ended in Dec. 2025 is calculated as

FCF Margin=Free Cash Flow (Q: Dec. 2025 )/Revenue (Q: Dec. 2025 )
=223.451/1126.859
=19.83 %

* 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.

Frequently Asked Questions Learn more about FCF Margin % →
What does a FCF Margin % of 19.83% mean?
Formosa Optical Technology Co (ROCO:5312) has a FCF Margin % of 19.83% as of Dec. 2025. Free cash flow margin is the ratio of total free cash flow to net sales. View historical data on Formosa Optical Technology Co and its competitors. This is 41% above median its historical median of 14.09. Over the past decade, Formosa Optical Technology Co's FCF Margin % has ranged from 9.52 to 18.72. According to the industry distribution chart, Formosa Optical Technology Co ranks #162 out of 816 companies in the Medical Devices & Instruments industry, placing it in the top 19.9%.
Is Formosa Optical Technology Co's FCF Margin % too high?
Formosa Optical Technology Co's current FCF Margin % of 19.83% is 41% above median its 10-year median of 14.09. Over the past 10 years, this metric has ranged from a low of 9.52 to a high of 18.72. Based on the distribution chart, Formosa Optical Technology Co ranks #162 out of 816 companies in the Medical Devices & Instruments industry, which is in the top quartile — a strong position relative to peers. Overall, Formosa Optical Technology Co has a GF Score™ of 81/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Formosa Optical Technology Co's FCF Margin % compare to ISRG and BDX?
According to the Medical Devices & Instruments industry distribution chart, Formosa Optical Technology Co ranks #162 out of 816 companies for FCF Margin %. This places Formosa Optical Technology Co in the top 20% of its industry — outperforming the majority of peers. Historically, Formosa Optical Technology Co's own FCF Margin % has ranged from 9.52 to 18.72 over the past decade. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good FCF Margin % for a Medical Devices & Instruments company?
A good FCF Margin % depends on the Medical Devices & Instruments industry context. However, FCF Margin % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high FCF Margin % mean?
A high FCF Margin % can signal that a stock is expensive relative to its fundamentals. Free cash flow margin is the ratio of total free cash flow to net sales. View historical data on Formosa Optical Technology Co and its competitors. Formosa Optical Technology Co's current FCF Margin % is 19.83%, which is 41% above median its own 10-year median of 14.09. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Formosa Optical Technology Co stock overvalued right now?
Based on GuruFocus' analysis, Formosa Optical Technology Co (ROCO:5312) is currently considered Modestly Undervalued. The stock's GF Value™ is NT$108.45, compared to a current price of NT$89.70 — trading 17.3% below its estimated fair value. The current FCF Margin % is 19.83%, which is 41% above median its 10-year median of 14.09. Formosa Optical Technology Co's overall GF Score™ is 81/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is FCF Margin % calculated?
FCF Margin % is calculated from a company's financial statements. For Formosa Optical Technology Co (ROCO:5312), the current FCF Margin % is 19.83% as of Dec. 2025. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Formosa Optical Technology Co (ROCO:5312) Overvalued in 2026?

Based on GuruFocus' analysis, Formosa Optical Technology Co stock appears to be undervalued. The current stock price of NT$89.70 is trading 17.3% below its estimated GF Value™ of NT$108.45. GuruFocus considers Formosa Optical Technology Co to be Modestly Undervalued.

Key valuation signals for ROCO:5312:

  • FCF Margin %: 19.83% (41% above median its 10-year median of 14.09)
  • GF Value™: NT$108.45 vs. price of NT$89.70 (17.3% below fair value)
  • GF Score™: 81/100 with 4 warning signs

No single metric tells the full story. See the ROCO:5312 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Formosa Optical Technology Co Business Description

Address No. 97, Xintai 5th Road, 16th Floor, Section 1, Xizhi District, New Taipei City, TWN
Formosa Optical Technology Co Ltd is mainly engaged in the eyewear business, including optometry services and the retail business selling contact lenses and eye drops. The Group mainly derives revenue from the business divisions of Formosa Optical Technology and Bo Wei Optical, with Formosa Optical Technology generating maximum revenue. The majority of revenue is derived from the sale of glasses. The Group generates the majority of its revenue from Taiwan.
81GF Score

Get the complete analysis for ROCO:5312

FCF Margin % is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

NT$89.70
Price
NT$108.45
GF Value