Centrica gained 5.75p to close at 156.20p on Budget day, outpacing a FTSE 100 that edged up just 0.1%.

Centrica (LSE:CNA) was one of the brighter spots in a subdued FTSE 100 on Wednesday 28 October. The shares advanced 5.75p, or 3.82%, to finish at 156.20p, comfortably ahead of a benchmark index that closed only 7.96 points higher at 10,694.50.

What the day did offer was a crowded policy and market backdrop, much of it centred on energy, and that is where any understanding of the move has to begin.

The numbers behind the move

A 5.75p gain to 156.20p implies that Centrica closed at 150.45p on Tuesday. Dividing 5.75p by 150.45p gives a rise of about 3.82%, which rounds to the 3.8% in the headline.

On the day's leaderboard, Centrica sat among a group of top performers. Whitbread (LSE:WTB) rose 5.59% and Halma (LSE:HLMA) gained 2.07%. Market reports said that the energy sector as a whole rose 0.8%, while banks climbed 1.1% after the Budget's change to the bank surcharge proved smaller than many had feared.

An energy-heavy Budget

Chancellor John Healey's first Budget leaned heavily on energy. Market reports said that the package contained a £100 energy payment, an extension of VAT relief on electricity and fuel-duty support. According to press reports, higher taxes on banks and betting companies are helping to fund that support with bills.

The pressures behind those measures were spelt out by one market commentator who highlighted forecasts that energy bills could climb by about £666 by April. Brent crude, meanwhile, was quoted at $116.37 a barrel around the London close, up from $114.13 on Tuesday.

It would be easy to connect these strands with Centrica's share price, but that link was not made in the coverage. Policy that affects household bills can matter to energy suppliers in general terms, for instance through its effect on customer affordability and demand, yet the precise impact on any one company depends on details that were not reported on the day.

Broadly, investors saw the Budget as a non-event for markets, and that in itself may have been welcome. One market commentator called it "a reassuringly dull budget from a market perspective". The 10-year gilt yield was around 5.33%, slightly lower than Tuesday's 5.34%, and sterling was barely changed at about $1.3310.

The fiscal numbers were in line with expectations. The OBR put the government's headroom at £15bn for 2029-30, down from £23.6bn in March, which matched a poll of economists. Growth for 2026 was nudged up to 1.2%, while the 2027 forecast was cut to 1% from 1.5%. Inflation is expected to average 3.1% in 2026 and 3.4% in 2027 before returning to the 2% target in 2028, roughly a year later than previously expected.

Not every sector shared Centrica's good fortune. Housebuilders suffered their biggest one-day fall since January 2025, with Barratt Redrow (LSE:BTRW) down 6.57% after the "Your First Home" scheme disappointed analysts on funding and timing. GSK (LSE:GSK) fell 4.78% and Unilever (LSE:ULVR) 2.05% following their quarterly updates, and market reports said personal care, drug and grocery stocks fell nearly 1.4% as a group.

What could shape the next leg

Several events in the days ahead may influence sentiment towards energy-related shares. Shell (LSE:SHEL) reports third-quarter results on Thursday, and the company had guided to a refining margin of $42 a barrel, up from $24 in the second quarter. BP (LSE:BP.) follows on Friday, with net debt guided at $13.5bn to $14.5bn at the end of September.

Interest rates are another strand. The US Federal Reserve held its target range at 3.75% to 4.00% after London closed on Wednesday, with two dissenters preferring a rise and the statement noting that inflation remains elevated. The ECB decides on Thursday, and the Bank of England announces its decision, together with a new Monetary Policy Report, on 5 November. Given the OBR's inflation outlook, the direction of UK borrowing costs is likely to stay in focus for the whole market.

Key dates to watch

  • Thursday 29 October 2026: Shell's third-quarter results and the ECB's rate decision, both relevant to sentiment across the energy sector.
  • Friday 30 October 2026: BP, NatWest (LSE:NWG) and AstraZeneca (LSE:AZN) report, with BP's figures offering further read-across for energy names.
  • Thursday 5 November 2026: The Bank of England's MPC decision and Monetary Policy Report, which will shape expectations for UK rates.
  • Thursday 12 November 2026: The ONS first estimate of UK GDP for July to September, a check on the health of the domestic economy.
  • Monday 21 December 2026: Changes from FTSE Russell's December index review take effect at the open.

The bottom line

Centrica's 3.8% rise to 156.2p made it one of the FTSE 100's standout performers on a Budget day that was otherwise quiet for the index. The session was heavily coloured by energy policy, with the Chancellor offering a £100 payment, extended electricity VAT relief and fuel-duty support, and with Brent crude trading above $116 a barrel. The more useful approach is to watch how the coming results from Shell and BP, and the central bank decisions in the days ahead, shape the backdrop for the energy sector as a whole.