Lesson 5 of 9
The guardrails you cannot set
The most important things about a business cannot be monitored from its filings. What each needs instead, and why a proxy is worse than no guardrail.
By Javier Sanz
Founder of ValueScreener. Built Ninety Nine, a securities services provider, and sold it to a tier-one global bank; ran operations and internationalization at Alpaca, the brokerage API.
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In one minute
- The most important things about a business are mostly not measured in money, so no filing tracks them.
- A monitorable proxy for an unmeasurable reason is worse than no guardrail: it reports holding about something it never measured.
- The fix is short: write the reason down, mark it unmonitorable, and date it when last checked by hand.
The most important things about a business cannot be monitored from its filings. That is not a complaint about disclosure. A filing is a periodic report of what has already been measured in money. Much of what decides whether a business is still the one you bought has not been measured at all.
What a condition can actually test
RowsWhat it testsColumnsFiled in a statement
The reason itself, No
Mark it unmonitorable
The reason itself, Yes
A real guardrail
A stand-in for the reason, No
Nothing to condition on
A stand-in for the reason, Yes
The trap
Six that come up often
A change of management. Disclosed on Form 8-K, but whether the successor allocates capital the way the last one did needs years of evidence, not a filing date.
A competitor entering. Nothing announces somebody else's decision. The first trace is a price concession or a share loss, reaching revenue and gross margin only after customers already know.
A regulatory change. Item 1A of Form 10-K describes it as a risk before it happens and Item 7 after. Neither is a series.
Customer concentration. Disclosed as a percentage for a period, not as something that moves. A relationship that sours mid-year is invisible until the next annual report.
A material contract's terms changing. The contract sits as an exhibit under Item 15. An amendment is disclosed on an 8-K under Item 1.01, but it moves no line while the old terms are still being performed.
Product quality slipping. It reaches the accounts through returns and warranty provisions, after the customers already know.
Why a proxy is worse than nothing
A reader with no figure behind a reason often reaches for a nearby one instead. The result holds while the reason fails, and keeps reporting that it holds. No condition at all leaves you knowing you are not watching. A proxy leaves you believing you are.
What to do instead
Write the unmonitorable reasons into the thesis anyway. Mark them unmonitorable. Put the date last checked by hand beside each one, and a few words on how. An unmonitorable reason that is written down gets reviewed on the schedule; one that is not gets forgotten.
One exception is close to monitorable: a disclosed material weakness in internal control. It is defined under Sections 302 and 404 of the Sarbanes-Oxley Act of 2002, and it is close to binary, a strong accounting-quality signal. The auditor attests to it only at accelerated and large accelerated filers. It is still a disclosure, not a series.
ValueScreener checks conditions on filed figures every night, flags an auditor change or non-reliance notice on an 8-K, and reminds you to review a written reason on the date you set. It does not measure the six items above: no filing does.
Check yourself
Why is a monitorable proxy worse than having no guardrail at all?
- Proxies are always computed incorrectly
- A proxy can hold while the real reason fails, and it keeps reporting that it holds
- Proxies take longer to compute than real guardrails
Show the answer
Answer: B.
No guardrail leaves you knowing you are not watching. A proxy leaves you believing you are, which is the more dangerous state.What should you do with a reason that is correct but has no filed figure behind it?
- Drop it from the thesis so the document stays clean
- Write it down, mark it unmonitorable, and date when it was last checked by hand
- Set a guardrail on the nearest available figure regardless
Show the answer
Answer: B.
A written, dated, unmonitorable reason gets reviewed on schedule. An unwritten one gets forgotten.What single question exposes a bad proxy before you adopt it?
- Is the figure filed every quarter
- Name the circumstance in which the figure holds and the reason fails
- Does the figure move a lot
Show the answer
Answer: B.
If that circumstance is easy to name, as it was for gross margin masking a mix shift, the proxy is not a safe stand-in.Sources
- Fisher, Common Stocks and Uncommon Profits, 1958, chapter 2, on scuttlebutt as evidence a filing does not carry.
- Sections 302 and 404 of the Sarbanes-Oxley Act of 2002, on certifications and management's assessment of internal control.
What this leaves out
- The six categories are common ones, not a complete list. What a filing does not measure is not enumerable.
- Nothing here says a qualitative reason matters less than a quantitative one. It is only less watchable on a schedule.
- The worked example is round invented arithmetic, not a real company's history.
- Nothing here is advice about any security.