Is ON stock overvalued?

"Overvalued" is partly a matter of opinion, but the yardsticks investors use are standard. Whether a stock is overvalued depends on what you expect next; these are the numbers investors usually compare.

Below, we lay out ON's valuation and growth numbers, compare them with similar companies and show how analysts see the stock.

The chart below tracks ON's daily closing price from May 7, 2026 to Nov. 2, 2026. Over that stretch it is down 30.3%, from $100.61 to $70.11, with a high of $133.93 on June 3, 2026 and a low of $66.60 on Sept. 16, 2026. Each red circle marks a week in which company insiders sold shares on the open market (1 week in this period; bigger circles mean more money). There are no green diamonds: no insider bought on the open market in this window.

ON valuation and growth numbers

The table below shows ON valuation and growth numbers. EPS growth (yoy) has the highest value (+122.1%) and PEG the lowest (+0.34%).

Also worth knowing about ON

Live ON data, updated every 30 minutes: ON insider trades, ownership and filings →

In ON Semiconductor Corp's own words

“Increasing power requirements are driving accelerated demand in our AI data center and industrial end markets, as customers adopt and ramp our differentiated products”

— Hassane El-Khoury, President and CEO of onsemi · SEC filing

From the company's earnings release filed with the SEC on 2026-11-02 (Form 8-K).

What would change the picture for ON

These are the specific events and levels to watch. None of them is a prediction.

• Insider buying: none on the open market in 90 days. A purchase by an executive or director would be the first in at least three months, and it would show up on SEC Form 4 within two business days.
• Price levels: a close above $133.93 would be a new 52-week high, 91.0% above the latest close of $70.11; a close below $44.9 would be a new 52-week low, 36.0% below it.
• Growth: revenue rose 2.9% year over year in the quarter ending Oct 2026 (trend: accelerating). At a P/E of 41.0, a slowdown would matter more than at a lower multiple.
• New shares: dilution risk is moderate now. A new shelf registration (S-3) or a prospectus supplement (424B) for an offering would raise it.

ON history: what happened after similar moves

Since 2023, ON fell 17.4% or more in a month 9 times (separate episodes, not counting the current one). Three months later it was higher in 6 of 8 cases; the median change was +15.6%.

Past moves don't predict the next one; they show how volatile the stock has been.

Questions people also ask

What is ON's 52-week high and low?

Over the past year ON closed as high as $133.93 and as low as $44.9. At $70.11 (Nov. 2, 2026) it is down 47.7% from the high and 56.1% above the low. More →

Are ON insiders buying or selling?

Insiders sold $1.2 million of ON on the open market in 90 days and bought none. Sales are often routine (taxes, diversification, pre-planned plans); purchases with their own money are the stronger signal.

Who is the largest shareholder of ON?

Among investment managers that file Form 13F, FMR LLC reported the largest ON position ($5.4 billion). 997 institutions reported holding ON for Q2 2026.

Is ON Semiconductor Corp issuing new shares?

Dilution risk reads moderate (25/100); the share count fell 3.3% in a year. That is based on 2 offering-related filing(s) in 12 months.

Does ON pay a dividend?

ON Semiconductor Corp reported no dividend payments over the last 12 months in its SEC filings.

Dates to watch for ON

Insider trades can come any day: they must be filed on Form 4 within two business days.

Key terms on this page

P/E ratio

Price divided by the last 12 months of earnings per share. A P/E of 20 means investors pay $20 for each $1 of yearly profit. It is only defined when the company is profitable.

Price-to-sales

Market value divided by the last 12 months of revenue. Useful for companies with little or no profit, but it ignores margins.

Form 4

The SEC form a company's officers, directors and 10% owners must file within two business days of buying or selling its stock.

Open-market trade

A purchase or sale on the exchange at the market price, paid with the insider's own money (code P or S on Form 4), as opposed to option exercises, grants or gifts.

Form 13F

A quarterly SEC report listing the U.S. stock holdings of every investment manager with more than $100 million. It is due 45 days after each quarter ends, so it shows positions with a delay.

Dilution

When a company issues new shares, each existing share owns a smaller piece of the company. Common sources: stock offerings, convertible debt and large stock-based pay.

Form 8-K

The SEC form for material events between quarterly reports: earnings releases, deals, executive changes, stock offerings and similar news.

Where these numbers come from

Every number on this page is computed from the data when the page is refreshed (usually daily); nothing is typed in by hand. This is information, not investment advice.

• Price: daily closing prices through Nov. 2, 2026; changes use 5, 21 and 63 trading days; the 52-week range uses the last 252 closes.
• Insider trades: SEC Form 4 filings for the last 90 days, counting only open-market purchases (code P) and sales (code S); option exercises, grants, gifts and filings with data errors are left out.
• Earnings dates and estimates: a market-data calendar; reported vs expected EPS for the last 4 quarters.
• Valuation and growth: revenue, earnings, margins and share counts from the company's SEC filings (XBRL data, latest quarter Oct 2026); P/E and price/sales use the latest close.
• Fund ownership: SEC Form 13F filings for Q2 2026.
• Dilution: share-count changes and offering-related SEC filings (shelf registrations, prospectus supplements, convertible notes) over two years, scored 0-100.
• History: 21-trading-day moves over about three years of daily closes, counted once per episode.