Monitoring Positions and Revisiting a Thesis

Why this matters

A thesis written once and never checked slowly becomes a story you tell yourself. Businesses change, and the reasons you bought something can quietly stop being true. At the other extreme, watching prices all day tends to produce anxiety and impulsive trades. The aim is a middle path: regular, deliberate check-ins focused on the things that actually matter.

What to watch: the business, not the price

A price tells you what other investors are willing to pay today. It doesn't tell you why. The information that matters for your thesis arrives through the company's own reports, which Part 4's SEC Filings: 10-K, 10-Q, and 8-K covered:

• Quarterly reports (10-Q) and the earnings releases that come with them: are revenue, margins, and cash flow tracking your expectations?¹
• Current reports (8-K), which announce major events such as a change in leadership, generally within four business days.²
• The annual report (10-K), the fullest picture of the year, including updated risk factors.³

Each time one arrives, the question is simple: does anything here touch my thesis or my thesis breakers?

A review schedule

When	What to check
As major news arrives	8-Ks and announcements that could affect a thesis breaker
Each quarter, for individual stocks	The 10-Q and earnings release against your expectations
Once a year, for each stock	The 10-K: rewrite the thesis briefly and decide whether you'd buy it today
Once a year, for each fund	Fees, what it now holds, and whether it still does the job you chose it for
Once a year, for the whole portfolio	Goals, time horizons, allocation, position sizes, and whether to rebalance

A portfolio of broad funds needs only the last two rows. The more individual companies you own, the more time monitoring takes, which is a real cost to weigh when choosing between funds and individual stocks.

A thesis scorecard

The simplest monitoring tool is your list of thesis breakers, with a status next to each one.

Thesis breaker	What the latest filings show	Status
The largest retailer cuts orders by a third or more	Orders from the retailer rose slightly	Not triggered
Cartridge sales in stores fall more than 20% in the year after the patent expires	The patent expires in two years; no change yet	Not yet testable
Subscriber growth below 10% for two years running	Subscribers grew 12% this year, down from 25%	Watch closely

This takes ten minutes a quarter, and it turns a vague feeling ("is it still okay?") into a specific answer. The filings described here are fictional; STU Corp is the made-up company from Parts 3 and 4.

Key takeaways

• Monitor the business through its filings, not the price through a screen.
• A workable rhythm: major news as it comes, each quarter's report, an annual rewrite of each thesis, and a yearly portfolio review.
• A thesis scorecard turns each review into specific checks against your thesis breakers.
• Fund portfolios need far less monitoring than portfolios of individual stocks.

Check your understanding

A stock you own falls 8% in a day with no news from the company. What's the most useful first step?

1. Sell right away, since a fall that large must mean investors know something you don't.
2. Buy more right away, since a fall without any news must mean the stock is now cheaper.
3. Check for filings or news that touch a thesis breaker; if there are none, note it and wait.

Someone's portfolio is three broad index funds. How much monitoring does it most likely need?

1. A yearly check of goals, allocation, fund fees, and whether to rebalance.
2. Reading the 10-Q of every company in the funds as soon as each one is filed.
3. A daily check of all three fund prices to catch any fall as early as possible.

What's next

Even if every holding is doing fine, the portfolio's mix will change on its own over time. Portfolio Drift and Rebalancing explains how and what to do about it.