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Independent research · Est. October 2026
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Stock X-Ray · Technology · S&P 500 Full Coverage — Phase 1

ON Semiconductor (ON)

X-Ray dated Oct 28, 2026 · Share price as of Oct 28, 2026 intraday, when the valuation snapshot was captured · Financials from SEC filings (EDGAR) · Valuation multiples from a labelled secondary source
The verdict — valuation label: OVERVALUED

Forward P/E 19.42x is 1.25x the peer median of 15.59x — a premium above the 1.15x level — while latest-quarter revenue grew only +9.2% year over year (PRIMARY/EDGAR), far behind its semiconductor cluster, so delivered growth does not pay for the premium. Trailing P/E 48.50x shows recent earnings were trough-level, and PEG 0.58 reflects an expected earnings recovery rather than current growth. Delivered demand check: the cluster median grew +36.5% year over year — demand rising across semiconductors, which makes ON's own +9.2% a company-specific lag, not a sector excuse.

19.4×
Forward P/E — price vs next year’s expected earnings (secondary source)
15.6×
Peer median forward P/E — closest comparable companies
48.5×
Trailing P/E — price vs the last twelve months of earnings
4.9×
Price / sales

What would change this label: Moves to FAIRLY PRICED if revenue growth accelerates to +20% or better year over year, closing the gap to the semiconductor cluster, or the price falls enough to bring forward P/E to about 17.9x (1.15x the peer median) or below. Moves toward UNDERVALUED only on evidence, not hope: two consecutive quarters of +20% growth at a forward P/E below about 14x (0.90x the peer median).

In simple words

ON Semiconductor makes chips for cars and factories. Its sales grew only about 9% while other chip companies grew much faster, yet its shares cost about 19 times next year's expected profit versus about 16 times for peers. You are paying extra for a recovery that has not yet appeared in its sales.

Words we use, in plain English: P/E ratio — the share price divided by earnings per share; how many dollars you pay for one dollar of yearly profit. Forward P/E — the same, using next year’s expected earnings. Free cash flow — cash a company has left after running the business and buying equipment. TTM — the last twelve months. Drawdown — the worst fall from a peak to the low after it.
Figure 1 — The share price vs the market — six years
ON Semiconductor (ON)S&P 500 (SPY)
542043545046532021202220232024202520262020-09-012026-10-27

Both lines start at 100 on 2020-09-01. Over the full window ON Semiconductor returned +261.70% and the S&P 500 +118.28% (price returns; dividends not reinvested). Worst peak-to-trough fall for ON Semiconductor: -70.4% (2023-08-01 to 2025-04-08). Source: Nasdaq official daily history.

What the label rests on

Forward P/E 19.42x is 1.25x the peer median of 15.59x — a premium above the 1.15x level — while latest-quarter revenue grew only +9.2% year over year (PRIMARY/EDGAR), far behind its semiconductor cluster, so delivered growth does not pay for the premium. Trailing P/E 48.50x shows recent earnings were trough-level, and PEG 0.58 reflects an expected earnings recovery rather than current growth. Delivered demand check: the cluster median grew +36.5% year over year — demand rising across semiconductors, which makes ON's own +9.2% a company-specific lag, not a sector excuse. The company’s forward P/E is 19.4× against a peer median of 15.6×. Its own history: UNVERIFIED — no sourced range available. Sector demand read: Delivered demand check: the Semiconductors group's median latest-quarter revenue growth was 36.5% year over year (SEC filings) — demand rising. Latest-quarter sales growth was +9.2% versus a year earlier (SEC filings).

Table 1
CompanyPrice (Oct 28, 2026)Forward P/ETrailing P/E
ON Semiconductor (ON)$75.7019.4×48.5×
FSLR$171.628.1×10.6×
MCHP$78.4820.1×115.7×
SWKS$86.3815.6×44.6×
MPWR$1,211.8937.5×73.9×
NXPI$253.5014.4×19.9×
Peer median15.6×

Multiples: stockanalysis.com (SECONDARY, S&P Global data), fetched Oct 28, 2026. Peer set chosen by sector; the median is the middle value of the set. The label and its numbers were recorded in the programme’s label registry on Oct 28, 2026 and will be scored at 6 and 12 months.

Sales, profit and cash

Figure 2 — Sales each quarter, and the gross margin
SalesGross margin (right axis)
$0B$1B$2B$2B0%30%60%Oct 2020Oct 2021Sep 2022Sep 2023Sep 2024Oct 2025Jul 2026

Gross margin = gross profit divided by sales, from SEC filings.

Figure 3 — Cash left over each quarter (free cash flow)
PositiveNegative
$-1B$0B$1BOct 2020Oct 2021Sep 2022Sep 2023Sep 2024Oct 2025Jul 2026

Free cash flow = cash from operations minus spending on plant and equipment, both from the company’s SEC cash-flow statement. Gaps are quarters where that spending line is not separately tagged in the filings — shown as gaps, never estimated.

Table 2
QuarterSalesGross marginNet incomeEPS (GAAP, diluted)Free cash flow
Q/E Jul 2026
2026-07-03
$1.6B38.4%$227M0.56$425M
Q/E Apr 2026
2026-04-03
$1.5B38.5%$-33M-0.08$217M
Q/E Dec 2025
2025-12-31
$1.5B36.0%$182M—$485M
Q/E Oct 2025
2025-10-03
$1.6B37.9%$255M0.63$372M
Q/E Jul 2025
2025-07-04
$1.5B37.6%$170M0.41$106M
Q/E Apr 2025
2025-04-04
$1.4B20.3%$-486M-1.15$455M
Q/E Dec 2024
2024-12-31
$1.7B45.2%$380M—$435M
Q/E Sep 2024
2024-09-27
$1.8B45.4%$402M0.93$294M
Q/E Jun 2024
2024-06-28
$1.7B45.2%$338M0.78$208M
Q/E Mar 2024
2024-03-29
$1.9B45.8%$453M1.04$276M
Q/E Dec 2023
2023-12-31
$2.0B46.7%$563M—$221M
Q/E Sep 2023
2023-09-29
$2.2B47.3%$583M1.29$134M

The last twelve reported quarters. Full 24-quarter history sits in the data pack behind this page. A dash means the figure is not tagged as a standalone quarter in the company’s SEC facts (the usual case is the fourth quarter, which many companies only report inside the full-year filing) — it is missing, not zero.

Earnings: getting better or worse?

Each box is one quarter’s earnings per share (EPS). Green means EPS was higher than the same quarter a year earlier; red means lower; a dash means the figure is not tagged in the filings.

Sep 2022
0.70
Dec 2022
—
Mar 2023
1.03
Jun 2023
1.29
Sep 2023
1.29
Dec 2023
—
Mar 2024
1.04
Jun 2024
0.78
Sep 2024
0.93
Dec 2024
—
Apr 2025
-1.15
Jul 2025
0.41
Oct 2025
0.63
Dec 2025
—
Apr 2026
-0.08
Jul 2026
0.56

Basis: GAAP diluted EPS from SEC company facts, compared with the same quarter a year earlier.

Key facts

Table 3
ItemValue
Company (legal name in filings)ON SEMICONDUCTOR CORP
Chief executiveHassane El-Khoury (source: https://www.reuters.com/technology/chipmaker-onsemi-forecasts-quarterly-revenue-above-estimates-resilient-auto-2026-05-04/)
SectorTechnology — Semiconductors — sells power and sensing semiconductors for cars and industrial equipment
Share price (Oct 28, 2026)$75.70
Market value (market cap)$30.6B — share price times shares outstanding of 389,311,721 (SEC filings; SEC EDGAR dei EntityCommonStockSharesOutstanding (latest))
Sales, last twelve months$6.2B
Net income, last twelve months$630M
Free cash flow, last twelve months$1.5B
Latest reported quarterQ/E Jul 2026 (of 24 quarters in the data pack)
Six-year price return vs S&P 500+261.70% vs +118.28%
Worst peak-to-trough fall-70.4% (2023-08-01 to 2025-04-08)

What we could not verify

  • TTM GAAP diluted EPS could not be summed from company facts because at least one of the last four quarters (typically Q4) has no standalone tagged EPS; trailing P/E is therefore taken from the labelled secondary source in valuation_label.md.
  • Own-history P/E range not yet compiled for this company in the Phase 1 batch run; the label rests on peer-median, growth and PEG evidence.
  • Valuation multiples were captured on Oct 28 at $75.70 while the price series closes Oct 27 at $78.67 — the shares moved between the two; multiples correspond to the captured price.
  • Guidance record (each quarter scored against the guidance the company gave the quarter before) is not yet compiled for this company — it is a Phase 2 layer. The earnings strip below therefore uses reported EPS versus a year earlier, which is fully sourced from filings.

The IT factor — the most exciting thing the market is overlooking — is not assessed on an X-Ray page. It belongs to the Deep Dive (Phase 2), where it gets the evidence standard it needs. Leadership-era scoring (the six years split by chief executive) is likewise a Phase 2 layer; this page names the current chief executive only, from a sourced profile.

Sources

  • SEC EDGAR submissions — Filing index; company legal name. https://data.sec.gov/submissions/CIK0001097864.json
  • SEC EDGAR company facts — Quarterly financial spine: revenue, gross profit, net income, GAAP diluted EPS, operating cash flow, PP&E capex, buybacks, dividends, diluted shares. https://data.sec.gov/api/xbrl/companyfacts/CIK0001097864.json
  • Nasdaq official daily history — Daily closes for the company; SPY (assetclass=etf) saved as raw/nasdaq_spy_raw.json over identical dates. https://api.nasdaq.com/api/quote/ON/historical?assetclass=stocks
  • Valuation multiples and peer figures — stockanalysis.com (SECONDARY, S&P Global data), fetched Oct 28, 2026; see valuation_label.md in the data pack.

Conventions: earliest-filed value per period, as first reported; cash-flow years-to-date differenced quarter by quarter; EPS never differenced; free cash flow = operating cash flow minus plant-and-equipment spending. This page is a dated snapshot — updates are new versions, never silent edits.

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