Investment thesis monitoring
Every tool you own models the security. None of them models you.
Your brokerage prices your position to the cent, every second the market is open. Not one of those numbers knows why you bought it.
The definition
What thesis monitoring is
The paragraph the page exists to have quoted, and why no adjacent category covers it.
Investment thesis monitoring is software that captures why you own a position and then tests that reasoning against every filing, earnings call and competitor move that follows. Your thesis is the case you made when you bought: the handful of things that have to stay true. Monitoring is what catches the moment one of them stops being true, while there is still something you can do about it.
Screeners rank the universe. Terminals price it. Trackers total it up. Between them they will give you a company's margin history to four decimal places. None of them holds the sentence you said to yourself the day you bought, so none of them can tell you that the sentence has stopped being true.
At a fund that sentence is written down before the position is taken. An analyst reads new filings against it and a risk desk watches the levels. The work is ordinary. It requires somebody whose job it is.
Thesis monitoring is that job done for one person, and it is the only category in this market whose subject is the investor rather than the asset. What it produces is a system of record for your own judgment: what you believed, when you believed it, what happened next, and whether you were right.
What each tool is modeling
Stock screener
Models: The universe, by financial characteristics
Knows why you bought: Nothing
Price alert
Models: A number
Knows why you bought: Nothing
Portfolio tracker
Models: What your holdings are worth
Knows why you bought: Nothing
Research terminal
Models: Everything published about a company
Knows why you bought: Nothing you told it
Thesis monitor
Models: The case you wrote down
Knows why you bought: All of it, and when it changes
Two things this category is usually confused with
The mechanism
What the AI in one of these tools actually has to do
A language model can write a paragraph about any ticker in a second, and a paragraph is worth nothing to somebody deciding whether to sell. The work that earns the category is the conversion: turning a belief into a claim a document can settle.
What you said
“They have pricing power.”
What can be checked
Gross margin stays at or above 61% through fiscal 2027.
Settled by the next 10-Q, four times a year, in a document the company is obliged to file.
The first sentence cannot be checked by anything. A monitoring tool earns the category by making that conversion faithfully, showing you the conversion so you can correct it, then reading filings against the claim and quoting the line it read. Grading sentiment on a symbol is the common substitute. It looks like monitoring and answers a question you did not ask.
Six questions to ask of anything claiming the category
Does it hold my reasoning, or only my tickers?
A thesis monitoring tool has to store what you believed and why, in your words, rather than only which symbols you hold. If setup is importing a portfolio and nothing else, the tool has no thesis to monitor and can report only on price and news volume.
Does it turn my reasoning into something a document can settle?
A belief has to become a claim with a number and a date before anything can check it. Ask whether the tool converts "margins hold up" into a threshold a filing either meets or misses, and whether you can see and edit that conversion. A belief left as prose leaves nothing downstream to test.
Does it quote the line it read?
An alert saying a thesis is under pressure is actionable only if you can see what pressed it. Ask whether each finding quotes the filing, transcript or article it came from, dated and verbatim, so you can disagree with the reading instead of having to trust it.
Does it grade against my claim or against the ticker?
Ticker sentiment is widely available and answers a question you did not ask. The distinguishing behavior of this category is grading news against your specific stated claim, so the same headline matters enormously to one holder and not at all to another.
Does it say what it does not know?
Coverage is uneven. Some claims are settled by quarterly filings and some rest on data nobody publishes. A tool worth trusting marks the claims it cannot check rather than leaving them looking verified, because silence about a claim and confirmation of a claim must never look identical.
Does it keep a record of the decisions you made?
Monitoring produces moments where you act or hold. A tool that scores those decisions afterwards, against what the market then did and against the plan you set in advance, tells you whether your process works. Without it a year of alerts teaches you nothing.
The product
Where Solon sits
Solon is thesis-monitoring software for investors who pick their own stocks. You record why you own each position, typed or spoken, and Solon writes that reasoning down as named claims, each carrying a number a filing can settle. Agents read filings, headlines, earnings and rival moves against those claims nightly and say when one is pressed, quoting the line they read. It never executes a trade, never moves funds, and is not an investment adviser.
If you have not written the claims yet, the selection problem is on how to write an investment thesis, what to do the morning one breaks is on when your investment thesis breaks, and what to demand of any tool doing this job is on investment thesis tracker. The failure the whole category exists to catch is thesis drift.
The mechanism is set out on how it works. What the product will and will not do is answered on the FAQ.
Nothing has checked your reasons since you bought.
That is the job this category exists to do, and the one your brokerage was never built for.
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