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Which report opened my stock lower?

Two reports can come out at the same minute, before the stock market opens. The stock still opens once. One price cannot be cut into a piece for each report after the fact.

Beginner guide · 8-minute read · Updated 2026-11-09

The short answer

Count the open once. If two reports landed at 8:30 a.m. Eastern, both of them are already in that open. You can see that the stock is lower. You cannot see how many dollars belonged to the first report and how many belonged to the second. There was one auction, not two.

One hundred shares, and an open you cannot split

Here is one position (hypothetical). You hold 100 shares of Northwind, a made-up company. It closes the day before at $50. That is $5,000. Overnight, nothing about the company changes. At 8:30 a.m. Eastern, two government reports come out together. The stock market is still closed. At 9:30 the stock opens at $44. The 100 shares are worth $4,400.

The bottom row is this account. The −$600 is the open. Selling at $44 locks it in. Holding does not put the $50 back. The price fell. The shares did not.

These prices are made-up. They are not a reading of either report, and they are not a forecast. The page does not invent the government numbers. Both reports are inside the same open, so naming one of them as "the" cause would be a guess. How to read a brokerage statement shows the shares at the open's price, or at the last price it has. It does not label that price with a report.

The mornings with two names

PCE inflation is inside a report called Personal Income and Outlays. It comes out at 8:30 a.m. Eastern. The dates for 2027 are the same list as the PCE release dates:

Source: bea.gov. On the BEA schedule, two of those dates also carry the first estimate of GDP: July 29 and October 28, 2027. Two reports, one minute, one open. If the table above moves, trust the table. A sentence that names July and October is only right while the schedule still says so.

A jobs morning is the other shape. One report, at 8:30, and the stock open an hour later. The jobs dates already price a stop that meets that single gap. This page is the morning when you cannot even point at one report.

CPI is usually alone at 8:30 as well. The CPI dates are that list. Do not paste a CPI story onto a morning that also has GDP. The clock is the same. The pile of news is not.

Why the open will not split

The opening auction picks one price, the price where the most shares can trade. Every order waiting for the open is in that auction. The auction does not run once for the inflation report and again for GDP. It runs once.

So a note that says "the stock fell $6 on the inflation number" has spent the whole $6. There is nothing left to attribute to GDP, and no second open to measure it with. The honest line is shorter. The stock fell $6 from the prior close to the open, and two reports were out before that open.

Futures can move at 8:31, and again at 8:32, while stocks are still closed. Those are two wiggles in a market that is open overnight. They are not two stock opens. By 9:30 they have been mixed into one print. A chart of the stock will show a gap, not two gaps.

The account does not sort the cause

A TFSA or an RRSP changes the tax treatment of what is inside. It does not label a gap with a report. One hundred shares inside a TFSA open at the same $44 as in a taxable account, in this hypothetical. The shelter did not pay the $600 back. A lower open does not hand contribution room back. Room follows the contribution rules, not which agency published at 8:30.

If you hold the same company as a Canadian-dollar receipt, the receipt has its own price and its own currency hedge. That is a third number. Do not subtract it from the US open and call the difference GDP. Read the receipt's own price.

What to write down

Write four things before you name the report that "did it."

1. The prior close, and the open. The difference is the whole gap.
2. How many reports hit at 8:30 that morning. One, or two.
3. That the stock auction ran once.
4. Whether you sold at the open, or you still hold the shares.

If two reports hit, stop at the gap. The dollars are real. The split is not. If you need a story for a journal, write "two reports, one open," and the $600. Leave the cause blank.

Questions

Which report cost me the $600? You cannot tell from the open. Both reports were out. There was one opening price.

Did the shares disappear? No. You hold the same 100 shares. They are worth less at $44 than they were at $50. The price fell.

Is this the same as a jobs Friday? The clock is the same, 8:30 and then a 9:30 open. A jobs Friday is usually one report. This page is the morning with two.

Does a TFSA sort it out? No. The shelter does not label the gap, and it does not fill the $600 back.

Are $50 and $44 the real prices? No. They are hypothetical, so the −$600 stays checkable. The dates in the table are the BEA list.