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Spark New ZealandASX:SPK -0.57%70 3-Year Book Growth Rate is -6.10% as of Jun. 2026. GuruFocus rates ASX:SPK with a GF Score™ of 70/100 and a GF Value™ of A$2.17 (Modestly Undervalued). The stock has 8 warning signs investors should review. Among 345 Telecommunication Services companies, Spark New Zealand ranks worse than 79.13% on this metric.
During the past 12 months, Spark New Zealand's average Book Value per Share Growth Rate was 8.20% per year.
During the past 3 years, the average Book Value per Share Growth Rate was -6.10% per year.
During the past 5 years, the average Book Value per Share Growth Rate was 0.80% per year.
During the past 10 years, the average Book Value per Share Growth Rate was -0.10% per year.
Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the average Book Value per Share growth rate.
During the past 13 years, the highest 3-Year average Book Value per Share Growth Rate of Spark New Zealand was 34.00% per year. The lowest was -16.60% per year. And the median was -1.10% per year.
Spark New Zealand (ASX:SPK) 3-Year Book Growth Rate Explanation
Book Value per Share is the ratio of equity available to common shareholders divided by the shares outstanding. Book value per share effectively indicates a firm's net asset value on a per-share basis. It can be used by investors to gauge whether a stock price is undervalued by comparing it to the firm's market value per share. Theoretically, it is what the shareholders will receive if the company is liquidated.
Spark New Zealand 3-Year Book Growth Rate Related Terms
ASX:SPK vs VZ, TMUS, T: 3-Year Book Growth Rate Comparison
For the Telecom Services subindustry, Spark New Zealand's 3-Year Book Growth Rate, along with its competitors' market caps and 3-Year Book Growth Rate 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.
Spark New Zealand 3-Year Book Growth Rate vs Telecommunication Services Industry
For the Telecommunication Services industry and Communication Services sector, Spark New Zealand's 3-Year Book Growth Rate distribution charts can be found below:
* The bar in red indicates where Spark New Zealand's 3-Year Book Growth Rate falls into.
Spark New Zealand 3-Year Book Growth Rate Calculation
This is the 3-year average growth rate of Book Value per Share. The growth rate is calculated using exponential compounding based on the latest four year annual data.
Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the average Book Value per Share growth rate.
What does a 3-Year Book Growth Rate of -6.10% mean?
Spark New Zealand (ASX:SPK) has a 3-Year Book Growth Rate of -6.10% as of Jun. 2026. 3-Year Book Growth Rate is the 3-year average growth rate of Book Value per Share. View historical data for Spark New Zealand and its competitors. According to the industry distribution chart, Spark New Zealand ranks #273 out of 345 companies in the Telecommunication Services industry, placing it in the top 79.1%.
Is Spark New Zealand's 3-Year Book Growth Rate too high?
Spark New Zealand's current 3-Year Book Growth Rate is -6.10%. Based on the distribution chart, Spark New Zealand ranks #273 out of 345 companies in the Telecommunication Services industry, which is in the bottom quartile relative to peers. Overall, Spark New Zealand has a GF Score™ of 70/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Spark New Zealand's 3-Year Book Growth Rate compare to VZ and TMUS?
According to the Telecommunication Services industry distribution chart, Spark New Zealand ranks #273 out of 345 companies for 3-Year Book Growth Rate. This places Spark New Zealand in the lower half of its industry. The industry median 3-Year Book Growth Rate is 3.10. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good 3-Year Book Growth Rate for a Telecommunication Services company?
The median 3-Year Book Growth Rate among Telecommunication Services companies is 3.10, based on 345 companies in the industry. Companies in the top quartile (top 25%) have a 3-Year Book Growth Rate significantly above this median, while those in the bottom quartile fall well below. However, 3-Year Book Growth Rate 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 3-Year Book Growth Rate mean?
A high 3-Year Book Growth Rate can signal that a stock is expensive relative to its fundamentals. 3-Year Book Growth Rate is the 3-year average growth rate of Book Value per Share. View historical data for Spark New Zealand and its competitors. For the Telecommunication Services industry, the median 3-Year Book Growth Rate is 3.10 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Spark New Zealand's current 3-Year Book Growth Rate is -6.10%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Spark New Zealand stock overvalued right now?
Based on GuruFocus' analysis, Spark New Zealand (ASX:SPK) is currently considered Modestly Undervalued. The stock's GF Value™ is A$2.17, compared to a current price of A$1.76 — trading 19.1% below its estimated fair value. The current 3-Year Book Growth Rate is -6.10%. Spark New Zealand's overall GF Score™ is 70/100 with 8 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is 3-Year Book Growth Rate calculated?
3-Year Book Growth Rate is calculated from a company's financial statements. For Spark New Zealand (ASX:SPK), the current 3-Year Book Growth Rate is -6.10% 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 Spark New Zealand (ASX:SPK) Overvalued in 2026?
Based on GuruFocus' analysis, Spark New Zealand stock appears to be undervalued.
The current stock price of A$1.76 is trading 19.1% below its estimated GF Value™ of A$2.17.
GuruFocus considers Spark New Zealand to be Modestly Undervalued.
Key valuation signals for ASX:SPK:
3-Year Book Growth Rate: -6.10%
GF Value™: A$2.17 vs. price of A$1.76 (19.1% below fair value)
No single metric tells the full story. See the ASX:SPK stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Spark is one of only three integrated telecommunications companies in New Zealand. It is the leading mobile network operator with low- to mid-40% subscriber and revenue share, and the dominant provider of fixed-line broadband services with a mid-30% subscriber share. It has a big position in the New Zealand corporate and wholesale telecommunications services provision space. Spark supplements its core telecommunications operations and related infrastructure with IT products and services across cloud, managed data and networks, procurement, data centers, and Internet of Things. Its operations are all based in New Zealand, except for its 41% interest in Southern Cross Submarine Cables, which has zero book value and to which Spark has no funding obligations.
70GF Score
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