A company's PE over long period provide good understanding on its share price valuation range. This is because company earnings, over extended period, largely follow economic cycle. A time period that includes a complete cycle of industry downturn and boom time would provide a good indication of its top and bottom valuation range. And from here we would know whether share price is cheap or expensive historically.
We can also compare a company's PE against the industry's average PE. This stems from fact that an industry has its specific characteristics and dynamics, such that as a whole, companies within the sector should trade at roughly similar valuation. This also entails that it is only meaningful to compare a company's PE ratio against those in the same sector. We can't really place a property share alongside a technology share for comparison. Doesn't make much sense.
At a very broad level, the company can also be inspected against a diversified market's PE, usually the STI or industry index. This is more pertinent if the company is a constituent of a particular index.
Let's look at an example: Singtel.
 |
Singtel's PE and trailing PE compared to industry's and broad market's.
Extracted from Shareinvestor.com on 8 Jan 2018. |
Singtel's PE ratio on 8 Jan, based on its full year earnings, is 15.3. However, its trailing PE is 10.3. This means that recent quarter's earnings have improved and it is valued more cheaply based on its trailing PE.
Against the Telecommunication industry, and the broad market of STI, or Large/Mid Cap Index, Singtel's PE appears to be in line. However, on trailing PE basis, Singtel is cheaper than STI and Large/Mid Cap Index.
PE Has to Be Used with Other Analysis and Indicators
PE is derived
from past earnings using rear-view mirror, while investing involves a heavy dose of dealing with future that is essentially unknown and uncertain.
You can't use PE as the be-all-end-all yardstick to evaluate shares. Apart from necessary comparisons with PE in other contexts as shared above, one
needs further homework on quantitative factors such as cash flow, debt level, revenue growth, and qualitative factors like industry analysis.
Risks of Investing in High PE Sector or Shares
When a company (or industry) trades at a much higher PE than its same-sector peers (or broad market), it usually means that the company/sector has shown good growth and promising prospects such that investors are willing to pay a higher price for its share.
However such optimism can sometimes gets out of hand when investors bid the share price up to an extremely rich PE level that is exorbitant and makes no sense, we can be sure that investment in these shares are quite speculative. For example, some technology stocks during the dot.com boom traded at PE of 250. Surely you would not buy a business that would return your capital in 250 years.
Ok let's leave the insane PE category aside and just talk about an expensive company with a still-plausible PE of 50 - Superb Tech Co. Investing in such a share will expose you to what I call a
'double whammy of earnings disappointment' that would have disastrous effect on the share price.
As seen from above, a single quarter of bad results could wreck the share price and cause a fall of almost 50% from $50 to $25.50. This is the potential impact of 'double whammy of earnings disappointment' - reduced earnings and PE downgrade.
Of course the above scenario is fictitious and exaggerated to illustrate my point. But for a more realistic example, refer to this
post.
Low PE Sector or Shares are Less Risky
While high PE can be detrimental if the company growth does not match expectation, conversely, a low enough PE can do wonder to share price if its so bad that market does not harbour any hope of earnings growth on the company due to prolonged industry downturn or sustained bad results.
The concept and principles remain, just inversed: high PE to low PE, high expectation to low expectation, promising sector to boring sector. Scenarios such as:
- cyclical industry on the cusp of multi-year recovery
- company that has prolonged bad business and suddenly receives a huge order
Then your reward can be huge, in form of exponential jump in share price.
Extremely Low PE Shares Have Their Pitfalls Too
Some
industries are cyclical with clear boom and bust cycle. Examples of such industries include commodity, property, oil and gas. At the peak of market cycle, industry is expanding and companies enjoy high earnings. Correspondingly, PE would seem very low due to a large denominator.
But what follows could be an industry downturn where business activities shrink and earnings would drop. Share price would follow. So a very
low PE in this case is deceptive because it indicates that market cycle is near its top. So an investor needs to be discerning enough to recognise such cycle, and
avoid investing at cyclical top.
One example. Wilmar, the world's largest palm oil producer. Back in Jan 2017, its share price was around $3.80, with PE of around 15 based on Dec 16 full year results. Crude Palm Oil (CPO) price, according to BusinessInsider, was RM 3,250 back then.
However, due to the cyclical nature of commodity, CPO price has since been on a downward slide and dropped to around RM 2,300 Dec 2017. An investor attracted by its reasonable PE of 15 would see its share price drop from $3.80 to $3.20 now.
 |
Top: CPO price chart Jan 17 to Jan 18. Bottom: Wilmar price chart Jan 17 to Jan 18.
Source: Businessinsider.com and Yahoo Finance |
Another scenario of a
deceptively low PE ratio could arise
from really lousy companies that have no possibility of turnaround. Its
earnings would continue to deteriorate and will turn into losses. When that happens, all is lost as there is no point investing in a loss making company.
How I Make Use of PE Ratio
Up till now, I have talked about the theory of PE. While they are not rocket science and the concepts are simple, understanding its relevance and appreciating its usefulness in real-life investment decisions still took me years.
PE is
my first criteria in stock screener. Anything above 30 will be filtered out, for fear of the 'double whammy of earnings disappointment'.
As much as I try to form an informed opinion about company's prospect, industry outlook, the future is still, inherently, unpredictable. I acknowledge this fact, and take a balanced approach of not investing in high PE shares to reduce risks. Even if next earnings fall short, the not-extremely-high PE should cushion the fall to a certain extent.
Companies with
borderline PE from 26 - 30, I will take a deeper look. They would need to have strong cashflow, low debts, comfortable dividend yield, and stable industry outlook, to compensate for my investment risks. And other usual due diligence applies: compare against historical figure, industry PE figure etc.
I also
do not consider shares with
extremely low PE such as below 5, for reasons illustrated earlier.
And I also calculate my
portfolio's average PE - sum of each counter's PE apportioned by its portfolio weightage. This is then compared to that of market's and relevant sector indices, to gauge roughly how expensive or cheap my shares are.
I formulate these PE usage guidelines based on my investment experience, philosophy and belief. By nature, I am a more conservative investor so I would always ensure my downside is covered before pursuing higher returns. While this has prevented me from getting into high growth stock with exponential returns, it also shielded me from price plunge when earnings disappoint. I am willing to give up outsize returns for lower possibility of share price falling off the cliff.
You should form your own opinions about comfortable PE level for your investments, and regularly refine/enhance these rules to suit your investment style.
Conclusion