Co-Tech Development (ROCO:8358) Change In Inventory: NT$-460 Mil (TTM As of Jun. 2026)

Author: Vera Yuan Vera Yuan
Vera Yuan
Vera Yuan
Director of Data and Quant Analytics at GuruFocus
Focused on building reliable datasets, financial models, and research tools for value-minded investors. Committed to turning complex data into practical guidance for value-investing and long-term wealth.
Reviewed by: Charlie Tian Charlie Tian
Charlie Tian
Charlie Tian
Founder & CEO of GuruFocus
Dr. Charlie Tian is the founder and CEO of GuruFocus.com, a leading global investment research platform established in 2004. With a Ph.D. in physics, Dr. Tian transitioned from science to finance, applying a data-driven, disciplined approach to value investing.

ROCO:8358 Co-Tech Development Corp ROCO:8358
77 GF Score
Price NT$500.00
GF Value NT$107.56
Valuation Significantly Overvalued
! 2 Warning Signs
View Full Analysis

What is Co-Tech Development Change In Inventory?

Co-Tech Development ROCO:8358 +6.38% 77 Change In Inventory is NT$-460 Mil as of Jun. 2026. GuruFocus rates ROCO:8358 with a GF Score™ of 77/100 and a GF Value™ of NT$107.56 (Significantly Overvalued). The stock has 2 warning signs investors should review.

Co-Tech Development's change in inventory for the quarter that ended in Jun. 2026 was NT$-32 Mil. It means Co-Tech Development's inventory increased by NT$32 Mil from Mar. 2026 to Jun. 2026 .

Co-Tech Development's change in inventory for the fiscal year that ended in Dec. 2025 was NT$-227 Mil. It means Co-Tech Development's inventory increased by NT$227 Mil from Dec. 2024 to Dec. 2025 .

Co-Tech Development's Total Inventories for the quarter that ended in Jun. 2026 was NT$1,323 Mil.

Days Inventory indicates the number of days of goods in sales that a company has in the inventory. Co-Tech Development's Days Inventory for the quarter that ended in Jun. 2026 was 58.63.

Inventory Turnover measures how fast the company turns over its inventory within a year. Co-Tech Development's Inventory Turnover for the quarter that ended in Jun. 2026 was 1.56.

Inventory-to-Revenue determines the ability of a company to manage their inventory levels. It measures the percentage of Inventories the company currently has on hand to support the current amount of Revenue. Co-Tech Development's Inventory-to-Revenue for the quarter that ended in Jun. 2026 was 0.47.

Co-Tech Development  (ROCO:8358) Change In Inventory Explanation

1. Days Inventory indicates the number of days of goods in sales that a company has in the inventory.

Co-Tech Development's Days Inventory for the quarter that ended in is calculated as:

Days Inventory=Average Total Inventories/Cost of Goods Sold*Days in Period
=1308.5855/2036.63*365 / 4
=58.63

2. Inventory Turnover measures how fast the company turns over its inventory within a year.

Co-Tech Development's Inventory Turnover for the quarter that ended in Jun. 2026 is calculated as

Inventory Turnover=Cost of Goods Sold / Average Total Inventories
=2036.63 / 1308.5855
=1.56

3. Inventory-to-Revenue determines the ability of a company to manage their inventory levels. It measures the percentage of Inventories the company currently has on hand to support the current amount of Revenue.

Co-Tech Development's Inventory to Revenue for the quarter that ended in Jun. 2026 is calculated as

Inventory-to-Revenue=Average Total Inventories / Revenue
=1308.5855 / 2804.743
=0.47

* 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.

Co-Tech Development Change In Inventory Related Terms

Co-Tech Development Change In Inventory Historical Data

* Premium members only.

The historical data trend for Co-Tech Development's Change In Inventory 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.

Co-Tech Development Change In Inventory Chart

Co-Tech Development Annual Data
Trend Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24 Dec25
Change In Inventory
Get a 7-Day Free Trial Premium Member Only Premium Member Only -287.69 91.56 -24.35 -15.77 -227.43

Co-Tech Development Quarterly Data
Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25 Sep25 Dec25 Mar26 Jun26
Change In Inventory 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 -63.21 29.73 -107.77 -350.22 -31.91
ROCO:8358
77GF Score
Co-Tech Development Corp ROCO:8358
Change In Inventory is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Co-Tech Development Change In Inventory Calculation

Change In Inventory is the difference between last period's ending inventory and the current period's ending inventory.

Change In Inventory for the trailing twelve months (TTM) ended in Jun. 2026 adds up the quarterly data reported by the company within the most recent 12 months, which was NT$-460 Mil.

* 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 Change In Inventory →
What does a Change In Inventory of NT$-460 Mil mean?
Co-Tech Development (ROCO:8358) has a Change In Inventory of NT$-460 Mil as of Jun. 2026. Change in Inventory is the difference between current-period inventory and past-period inventory. View historical data for Co-Tech Development and its competitors.
Is Co-Tech Development's Change In Inventory too high?
Co-Tech Development's current Change In Inventory is NT$-460 Mil. Overall, Co-Tech Development has a GF Score™ of 77/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does Co-Tech Development's Change In Inventory compare to APH and GLW?
Co-Tech Development's Change In Inventory of NT$-460 Mil can be compared against companies in the Hardware industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Change In Inventory for a Hardware company?
A good Change In Inventory depends on the Hardware industry context. However, Change In Inventory 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 Change In Inventory mean?
A high Change In Inventory can signal that a stock is expensive relative to its fundamentals. Change in Inventory is the difference between current-period inventory and past-period inventory. View historical data for Co-Tech Development and its competitors. Co-Tech Development's current Change In Inventory is NT$-460 Mil. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Co-Tech Development stock overvalued right now?
Based on GuruFocus' analysis, Co-Tech Development (ROCO:8358) is currently considered Significantly Overvalued. The stock's GF Value™ is NT$107.56, compared to a current price of NT$500.00 — trading 364.9% above its estimated fair value. The current Change In Inventory is NT$-460 Mil. Co-Tech Development's overall GF Score™ is 77/100 with 2 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Change In Inventory calculated?
Change In Inventory is calculated from a company's financial statements. For Co-Tech Development (ROCO:8358), the current Change In Inventory is NT$-460 Mil as of Jun. 2026. 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 Co-Tech Development (ROCO:8358) Overvalued in 2026?

Based on GuruFocus' analysis, Co-Tech Development stock appears to be overvalued. The current stock price of NT$500.00 is trading 364.9% above its estimated GF Value™ of NT$107.56. GuruFocus considers Co-Tech Development to be Significantly Overvalued.

Key valuation signals for ROCO:8358:

  • Change In Inventory: NT$-460 Mil
  • GF Value™: NT$107.56 vs. price of NT$500.00 (364.9% above fair value)
  • GF Score™: 77/100 with 2 warning signs

No single metric tells the full story. See the ROCO:8358 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.

Co-Tech Development Business Description

Address No. 392, Ruiguang Road, 18th Floor, Neihu District, Taipei, TWN, 114
Co-Tech Development Corp manufactures and sells standard, low profile and high-performance series of copper foil products to supply the printed circuit board industry. Its products include IT, 3C Products HDI, LED car lighting module, Server, Switch, Storage, Rigid-Flex PCB, Touch module, 3D face recognition, Automotive market, 5G Antenna Radar, ADAS, HDI / Rigid-Flex Board, Touch module, Wearable devices / VR, Augmented Reality, Mobile terminal, 3D face recognition, Communication module. The group has only copper foil segment operating in two principal geographical areas - Taiwan and China.
77GF Score

Get the complete analysis for ROCO:8358

Change In Inventory is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

NT$500.00
Price
NT$107.56
GF Value