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AltaGas (ATGFF, Natural gas utilities) Stock Valuation & Fair Value

Weak on forward returns

AltaGas (ATGFF, Natural gas utilities) trades at a current P/E of 21.0, about 10% above its historical normal valuation, with a forward growth estimate of 4.6% and a PEG of 4.53. Analysts' one-year estimates have been hit 55% of the time. Priced at its historical normal P/E of 19.0 on the same blended earnings, the 2026-11-06 close of $37.64 corresponds to about $34.20 a share. This is a valuation reference, not a price target. The $37.64 close is the one the P/E is read at; the technical context below uses the 2026-11-06 close, $37.69.

How to read these numbers: the PEG ratio and current P/E versus normal P/E.

DATA AS OF 2026-11-07
Current P/E
21.0
Normal P/E
19.0
PEG
4.53
Fwd growth
4.6%
Div yield
2.3%
RSI (14)
37.5
Neutral
Technical context
  • Price $37.69 at the Nov 6 close, 4.4% below the 20-day average ($39.44) and 2.1% below the 50-day ($38.49).
  • RSI (14) at 37.5.
  • 52-week range $28.50 to $40.36: the price is 6.6% below the high and 32.2% above the low.

Valuation flags

Verdict history

tickerseer's rating moved from weak on forward returns (2026-09-19) to poor on forward returns (2026-11-02). New rating rules took effect in the week of 2026-11-02, and this rating moved across that change, so part of the move may come from the new rules rather than the company.

Current P/E and rating by weekCurrent P/E moved from 21.9 to 22.3 between 2026-09-18 and 2026-10-30, against a normal P/E of 19.0, with 1 rating change over 7 recorded weeks.2026-09-18: P/E 21.9, Weak on forward returns, recalculated for the week of 2026-09-192026-09-18: P/E 21.9, Weak on forward returns, recorded live 2026-09-212026-09-25: P/E 21.2, Weak on forward returns, recalculated for the week of 2026-09-262026-09-25: P/E 21.2, Weak on forward returns, recorded live 2026-09-282026-10-02: P/E 21.6, Weak on forward returns, recalculated for the week of 2026-10-032026-10-02: P/E 21.6, Weak on forward returns, recorded live 2026-10-052026-10-09: P/E 22.5, Weak on forward returns, recalculated for the week of 2026-10-102026-10-09: P/E 22.5, Weak on forward returns, recorded live 2026-10-122026-10-16: P/E 23.1, Trading above its usual valuation, recalculated for the week of 2026-10-172026-10-16: P/E 23.1, Trading above its usual valuation, recorded live 2026-10-192026-10-23: P/E 22.7, Weak on forward returns, recalculated for the week of 2026-10-242026-10-23: P/E 22.7, Weak on forward returns, recorded live 2026-10-262026-10-30: P/E 22.3, Poor on forward returns, recalculated for the week of 2026-10-312026-10-30: P/E 22.3, Poor on forward returns, recorded live 2026-11-0220.022.0Sep 18Sep 28Oct 9Oct 20Oct 30Normal P/E 19.0
Weak on forward returnsTrading above its usual valuationPoor on forward returnsLarger dot: a stronger reading

Not every point was recorded live. Points marked recalculated are worked out from the metrics tickerseer archived that week.

Selected weeks: the first, the latest, every week the rating moved, and the cheapest and dearest.

WeekCurrent P/EPremium to normal P/ERating
2026-09-19P/E 21.9+15%Weak on forward returns (recalculated)
2026-09-26P/E 21.2+12%Weak on forward returns (recalculated)
2026-10-17P/E 23.1+21%Trading above its usual valuation (recalculated)
2026-10-31P/E 22.3+17%Poor on forward returns (recalculated) (across a rating rules change)
2026-11-02P/E 22.3+17%Poor on forward returns ← now
Show all 14 readings
WeekCurrent P/EPremium to normal P/ERating
2026-09-19P/E 21.9+15%Weak on forward returns (recalculated)
2026-09-21P/E 21.9+15%Weak on forward returns
2026-09-26P/E 21.2+12%Weak on forward returns (recalculated)
2026-09-28P/E 21.2+12%Weak on forward returns
2026-10-03P/E 21.6+14%Weak on forward returns (recalculated)
2026-10-05P/E 21.6+14%Weak on forward returns
2026-10-10P/E 22.5+18%Weak on forward returns (recalculated)
2026-10-12P/E 22.5+18%Weak on forward returns
2026-10-17P/E 23.1+21%Trading above its usual valuation (recalculated)
2026-10-19P/E 23.1+21%Trading above its usual valuation
2026-10-24P/E 22.7+19%Weak on forward returns (recalculated)
2026-10-26P/E 22.7+19%Weak on forward returns
2026-10-31P/E 22.3+17%Poor on forward returns (recalculated) (across a rating rules change)
2026-11-02P/E 22.3+17%Poor on forward returns ← now

Frequently asked questions

Is AltaGas stock overvalued?

At a current P/E of 21.0 versus its historical normal P/E of 19.0, AltaGas trades about 10% above its typical valuation, with a PEG of 4.53 on 4.6% forward growth. tickerseer currently rates it weak on forward returns.

What is AltaGas's fair value and PEG?

AltaGas trades at a current P/E of 21.0 against a historical normal P/E of 19.0, a PEG of 4.53, and a forward growth estimate of 4.6%. Priced at its historical normal P/E of 19.0 on the same blended earnings, the 2026-11-06 close of $37.64 corresponds to about $34.20 a share. This is a valuation reference, not a price target.

Has tickerseer's rating of AltaGas changed?

tickerseer's rating moved from weak on forward returns (2026-09-19) to poor on forward returns (2026-11-02). New rating rules took effect in the week of 2026-11-02, and this rating moved across that change, so part of the move may come from the new rules rather than the company.

Industry: Natural gas utilities. Create a free account to see the full analysis: the SeerAI score, its five quality sub-scores, valuation history, and an AI research note where we have one. Options setups and metric history are part of the paid plans.

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