10 hottest ISA shares, funds and trusts: week ended 18 September 2026

We look at the investments ii customers have been buying within their ISAs during the previous week. The data includes only real-time trades, not regular investing instructions, and combines the use of both existing funds and new money.

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Top 10 shares in ISAs

There’s another new leader in this list of most-bought stocks in ISAs on the ii platform, and it’s a surprise that this FTSE 100 shares has never topped the table before.

Glencore (LSE:GLEN) gained three places to take pole position from Dunelm Group (LSE:DNLM) which disappears from the top 10 list. Bargain hunters were attracted by a sharp drop in the share price following a report in the Financial Times that the company had suspended head of steelmaking raw materials Peter Hill.

The move came as Glencore becomes caught in a fierce legal fight with iron ore trader Radiant World, which launched a $2 billion legal claim in Singapore against three Glencore entities. It alleges that Glencore had misrepresented the pair’s ties in its audited records.

Glencore shares fell to their lowest in a month and down 12% from a record high set the previous week.

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Barclays (LSE:BARC) is back in the list, this time in third place. It had found support earlier in the week when UBS reiterated its price target of 600p and said the shares were cheap given their modest valuation. But the share price quickly fell to a multi-month low when fintech firm Revolut said it is considering a dual stock market listing on both London and New York.

Despite its popularity, Marks & Spencer Group (LSE:MKS) rarely makes the top 10 most-bought list, missing here since May. It’s in at number five this time, though, as investors digested several developments. The week started badly when UK inflation data painted a gloomy outlook for industry margins.

Goldman Sachs then cut its price target for M&S by 20p, although it’s still at 470p, while the ‘buy’ rating is maintained. Then later in the week analysts at Berenberg explained why they had a 480p price target, mentioning stronger free cash flow which could mean bigger dividend increases. 

Taylor Wimpey (LSE:TW.) moves up one place from 11th a week ago. Shares had tested the 75-76p level again, near a 13-year low, before staging a modest recovery. Results from Barratt Redrow (LSE:BTRW) encouraged buying across the sector despite few signs of respite in the near term.

Greatland Resources Ltd (LSE:GGP) regained popularity as investors used it to play volatility in the gold price, while IQE (LSE:IQE) appears here for the first time since the end of June. The semiconductor wafers manufacturer remains the best performing share on the FTSE AIM All-Share, up 774%.

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Orosur Mining Inc (LSE:OMI) makes its debut here after the shares surged 77% over the week. The AIM listed miner announced it had identified gold mineralisation from surface at the El Cedro prospect on the Anzá project area in Colombia.

Chief executive Brad George said: “Real grassroots discoveries have become very rare in modern times - and we possibly have two……so far. This is testament to the geological potential of the Anza Project and Colombia as an exploration destination, but mostly to the talent and dedication of the local team."

Analysts at SP Angel, Orosur’s house broker, said: “The mineralisation described in [drill hole] CED001 sounds like the sort of alteration event that can host large scale and promising mineralisation.”

Top 10 funds and trusts in ISAs

The Polar Capital Technology Ord (LSE:PCT) trust has returned to our bestseller list as it holds on to a run of strong outperformance.

The fund, which has benefited from its exposure to Asia this year, has suffered from volatility in that space very recently but still outpaces the competition. PCT shares have returned around 53% so far in 2026, well ahead of 36% for Allianz Technology Trust Ord (LSE:ATT), 26% for the L&G Global Technology Index I Acc (B0CNH16) and around 20% for the punchy Manchester & London Ord (LSE:MNL).

Investors are otherwise sticking to their guns again when it comes to fund buys. The Royal London Short Term Money Mkt Y Acc (B8XYYQ8) fund stays on in top spot, with investors also taking passive exposure to markets via the Vanguard FTSE Global All Cp Idx £ Acc (BD3RZ58) fund, HSBC FTSE All-World Index C Acc (BMJJJF9), Fidelity Index World P Acc (BJS8SJ3) and Vanguard LifeStrategy 80% Equity A Acc (B4PQW15).

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Beyond that we see the same active funds pulling in the punters, from the outperforming, value-focused Artemis Global Income I Acc (B5ZX1M7) to future trends fund Scottish Mortgage Ord (LSE:SMT) and two very different yield plays, Greencoat UK Wind (LSE:UKW) and City of London Ord (LSE:CTY).

The latter just became the first trust to establish a 60-year record of dividend increases.

It’s also worth highlighting a name just outside our table, Schroder Real Estate Invest Ord (LSE:SREI), which sits in 11th place.

Not usually a fund to appear in our bestseller list, it completed a joint acquisition of Picton Property Income alongside LondonMetric Property earlier this month. The commencement of dealing for new SREI shares may well have pushed it up the rankings.

Funds and trusts section written by Dave Baxter, senior fund content specialist at ii.