BlackRock explained: what the world's largest asset manager actually does

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This article is for informational and educational purposes only. It is not financial advice, investment advice, tax advice, pension advice, a recommendation, or a personal financial promotion. Investments can rise and fall in value and you may get back less than you invest. Speak to a financial adviser authorised by the FCA (Financial Conduct Authority) before making investment decisions.

BlackRock manages nearly $14 trillion for clients around the world. It is one of the most important providers of ESG (environmental, social and governance) investment products, one of the largest forces in passive investing, and one of the clearest examples of how climate finance changed between 2020 and 2026.

For readers in the United Kingdom (UK), related guides include our explainers on Norway's sovereign wealth fund, green pension funds, the world's largest pension funds, sustainable ETFs, FCA SDR labels, sustainable fund greenwashing and climate risk in investment portfolios.

The short answer

BlackRock is the world's largest asset manager. It manages investment assets for clients such as pension funds, sovereign wealth funds, insurers, governments, charities, financial advisers and individual investors. It is not mainly investing its own money. In most cases, it manages money that belongs to clients.

That distinction matters. When BlackRock-managed funds hold shares in Apple, Microsoft, Shell, BP, HSBC or thousands of other listed companies, the beneficial owners are usually the investors in those funds. BlackRock may vote the shares at annual general meetings on behalf of clients, unless voting choice or another arrangement applies, but the economic exposure belongs to the fund investors.

Why BlackRock matters

If you have a workplace pension, a stocks and shares ISA (individual savings account), a global tracker fund, a model portfolio or a sustainable ETF (exchange-traded fund), there is a reasonable chance that BlackRock appears somewhere in the background. That does not mean every investor directly chooses BlackRock. It means BlackRock products and BlackRock-managed index strategies are widely used across pensions, platforms and adviser portfolios.

The firm's scale is difficult to visualise. At 31 March 2026, BlackRock reported $13.9 trillion of AUM. Its Q1 2026 earnings supplement also reported a record first quarter for iShares ETFs (exchange-traded funds) and continued growth in Aladdin, its institutional technology platform. The number is larger than the annual gross domestic product (GDP) of almost every country except the United States (US) and China.

That comparison needs a caveat. GDP is annual economic output. AUM is the value of assets managed at a point in time. They measure different things. But the comparison is still useful because it shows the practical scale of the institution. BlackRock is not a normal fund shop. It is a central piece of the global investment system.

What BlackRock actually does

BlackRock was founded in 1988 by eight partners, including Larry Fink. It grew from a specialist fixed-income risk manager into the world's largest asset manager, helped by the acquisition of Barclays Global Investors in 2009, which brought the iShares ETF business into BlackRock.

The business can be understood in four parts.

Index funds and ETFs

A large part of BlackRock's business is passive investing. Passive funds do not try to pick individual winners. They track an index. A global equity tracker, for example, may hold hundreds or thousands of companies because the index contains those companies. BlackRock's job is to replicate the index efficiently, keep costs controlled and manage fund operations.

This is why BlackRock appears so often in shareholder registers. If a company is large enough to be in a major index, many index funds will hold it. BlackRock-managed funds may be large shareholders because clients have invested in those index funds, not because BlackRock's own corporate balance sheet is making a direct stock-picking decision.

Active funds

BlackRock also runs active strategies, where portfolio managers make investment decisions using research, valuation work and portfolio judgement. Active funds can apply more deliberate sustainability screens, climate-transition views, sector exclusions or stewardship priorities than a pure index product, but they also rely more heavily on manager skill and can charge higher fees.

Aladdin and technology

Aladdin is BlackRock's risk and portfolio management technology platform. It is used by institutional investors to analyse portfolios, risk, exposures and operational data. This matters because BlackRock's influence extends beyond the assets it directly manages. Some institutions use BlackRock technology to understand and manage assets that BlackRock itself does not manage.

Private markets and alternatives

BlackRock has also expanded into private markets, infrastructure, private credit and alternatives, including through major acquisitions. This part of the business is relevant to climate and sustainable finance because infrastructure, energy networks, data centres, renewable power, transmission grids and transition-related assets increasingly sit in private markets rather than ordinary public equity funds.

Why the ownership distinction matters

BlackRock is often described as if it "owns" large parts of the market. That wording is usually too loose. A BlackRock-managed fund may own shares. The people, pension schemes or institutions invested in that fund usually own the economic interest. BlackRock is the manager and, in many cases, the voting agent.

This distinction is not just technical. It changes how investors should think about responsibility.

• Investment exposure: the investor in the fund bears the market gain or loss.
• Fund design: BlackRock or the index provider decides the methodology the fund follows.
• Voting: BlackRock may vote shares unless clients can use voting choice or a separate voting policy.
• Stewardship: BlackRock can engage with companies, but it says stewardship decisions are made in clients' financial interests.

For UK investors, the useful question is not simply "is BlackRock good or bad?" The useful question is: what product do you hold, what does it track, what does it exclude, how does it vote and does that match what you thought you were buying?

The 2020 climate moment

In January 2020, Larry Fink published a letter called "A Fundamental Reshaping of Finance." It became one of the most discussed documents in sustainable finance because it argued that climate risk was investment risk and that capital markets would begin repricing assets as climate risk became more visible.

BlackRock's 2020 client letter said sustainability would become central to portfolio construction and risk management. It also said BlackRock would exit certain investments that presented high sustainability-related risk, including thermal coal producers, and would strengthen sustainability and transparency in investment stewardship.

That was a turning point because it moved climate risk from a niche sustainability topic into mainstream institutional finance. If the world's largest asset manager says climate risk affects investment risk, pension trustees, corporate boards, regulators and fund selectors pay attention.

BlackRock joined the Net Zero Asset Managers initiative (NZAM) in March 2021. NZAM was a voluntary climate-finance alliance whose members committed to supporting investing aligned with net zero greenhouse gas emissions by 2050, subject to their fiduciary duties and client mandates. At its peak, the initiative had more than 325 signatories managing more than $57 trillion.

The retreat from public climate leadership

Between 2022 and 2025, the politics around ESG changed sharply in the US. Republican-led states and officials increasingly argued that asset managers with climate commitments could be putting political or social goals ahead of fiduciary duties. Several states restricted or reviewed relationships with asset managers they viewed as hostile to fossil fuels.

In November 2024, the Texas Attorney General, joined by ten other Republican-led states, sued BlackRock, State Street and Vanguard. The lawsuit alleged anticompetitive conduct in coal markets linked to climate-related engagement. The defendants deny the allegations, and the litigation remains a legal claim rather than a settled finding.

BlackRock's voting record also changed. Its support for environmental and social shareholder proposals fell from the high levels seen around 2021. BlackRock argued that it was applying a more demanding test: proposals had to be financially material, practical and likely to support long-term shareholder value. Critics argued that the shift reflected political pressure. The practical result was clear either way: BlackRock became less likely to support broad or prescriptive climate proposals than it had been during the peak of its public climate push.

Why BlackRock left NZAM

On 9 January 2025, BlackRock published an excerpt from a client letter announcing its formal withdrawal from NZAM. The letter said that many of its largest clients around the world, including all of its largest client relationships in Europe, had made net zero commitments for their own organisations. It then said that memberships in some climate organisations had caused confusion about BlackRock's practices and subjected the firm to legal inquiries from public officials.

That wording is important. BlackRock did not say it would stop managing sustainable funds, stop serving clients with net zero commitments, or stop considering material climate risk. It withdrew from a public alliance that had become politically and legally costly.

Four days later, NZAM announced a review and suspended activity on tracking signatory implementation and reporting while that review took place. NZAM referred to recent developments in the US and different regulatory and client expectations across jurisdictions. In late 2025, NZAM announced a revised model and said signatories would continue to set individual targets, implement stewardship strategies and report annually.

That sequence is better understood as a restructuring of the climate-finance coalition model than as a simple end of asset-manager climate work. BlackRock stepped away from the alliance. NZAM paused and redesigned itself. Client demand, product regulation and sustainable investment mandates did not disappear.

What BlackRock still does on climate and ESG

The mistake is to treat BlackRock's NZAM exit as if it automatically means BlackRock abandoned ESG. It did not. The firm still manages sustainable, ESG, screened, climate-aware and Paris-aligned products for clients. It still offers iShares ETFs with sustainability methodologies. Its stewardship teams still vote and engage where they believe issues are financially material. Its European business still serves institutions with net zero commitments.

The better description is a change in visibility. BlackRock has moved from loud public climate leadership toward quieter, client-led implementation. That is less satisfying as a slogan, but more accurate as an investment reality.

European client demand still matters

Europe remains a very different market from the US. European pension funds, insurers, sovereign investors and retail platforms operate in a regulatory environment where climate risk, transition plans, sustainability labels and product disclosures are often expected. The Sustainable Finance Disclosure Regulation (SFDR), the Corporate Sustainability Reporting Directive (CSRD), the UK Sustainability Disclosure Requirements (SDR) and other frameworks all push investors and companies toward clearer sustainability information.

That means BlackRock cannot simply walk away from climate-related investment services without ignoring what many clients in Europe are asking for. The NZAM departure reduced BlackRock's exposure to a public alliance. It did not remove the commercial need to serve clients with climate policies and sustainability mandates.

Product labels still need scrutiny

For retail investors, the iShares label is not enough. A sustainable ETF might use a broad ESG score, a fossil-fuel screen, a Paris-aligned benchmark, a best-in-class sector method or a thematic environmental index. Those approaches can produce very different portfolios.

Before buying any fund, check the methodology, benchmark, top holdings, exclusions, fees and stewardship disclosures. A low-cost ETF can still hold companies that surprise you. A climate-themed fund can still be concentrated and volatile. An ESG label can mean risk management, values screening, impact, transition exposure or a mixture of all four.

Our guide to spotting greenwashing in sustainable funds explains the practical checks, and our fund factsheet checklist shows what to read before relying on a fund name.

Examples of iShares ESG funds investors might encounter

The table below is not a recommendation. It is a practical way to show how different iShares sustainability products can mean different things. In fund names, Undertakings for Collective Investment in Transferable Securities (UCITS) refers to a common European fund structure, while socially responsible investment (SRI) usually refers to a fund methodology with screens or selection rules. Figures were checked against BlackRock's UK individual investor product pages on 3 June 2026, but fund costs, classifications, benchmarks, holdings and share classes can change. Always read the current factsheet, Key Investor Information Document (KIID), prospectus and platform information before making any investment decision.

The practical lesson is that "iShares ESG" is not one thing. Some funds are broad market trackers with sustainability tilts. Some are stricter SRI screens. Some are thematic funds. Some are bond funds. Investors should compare the actual benchmark, holdings, exclusions, stewardship information and fees rather than relying on the BlackRock or iShares brand alone.

What BlackRock's voting record tells investors

Investment stewardship is one of the main ways passive asset managers exercise influence. A passive index fund cannot easily sell every company that faces climate, governance or social controversy without leaving the index. Voting and engagement therefore matter.

BlackRock Investment Stewardship reported more than 2,300 engagements with companies and votes at more than 16,500 shareholder meetings during 2025. The stewardship report also makes clear that BlackRock's stewardship role is focused on clients' investment objectives and long-term financial value, not on acting as a general climate campaigner.

That does not make stewardship irrelevant. It makes it more specific. Investors should ask whether the stewardship policy attached to their fund matches the sustainability claim they assumed. A fund that says it focuses on climate transition should have a credible voting, engagement and escalation approach. A fund that simply tracks a broad index with an ESG screen may have a much narrower stewardship role.

What UK pension and ISA investors should check

BlackRock's scale only matters to an individual investor if it affects the products they actually hold. Start with your pension portal, platform or fund factsheet. Look for the fund manager, the underlying funds, the index provider and the top holdings.

If you find BlackRock or iShares in your pension or ISA, that is not automatically a problem. BlackRock products can be low-cost, diversified and useful. The point is to know what role they play, what sustainability claim is being made, and whether that claim is backed by evidence.

How BlackRock compares with Norway's sovereign wealth fund

BlackRock and Norway's Government Pension Fund Global are often discussed in the same breath because both are enormous global investors. They are very different institutions.

Norway's fund is a sovereign wealth fund with a public mandate, ethical exclusions, published holdings and a national fiscal role. BlackRock is a commercial asset manager serving thousands of clients with different objectives. Norway's fund can apply one public ethical framework across its portfolio. BlackRock must manage products for clients whose preferences, legal duties and jurisdictions differ.

That distinction is useful for investors. Norway shows what centralised public investment governance can look like. BlackRock shows what happens when a global commercial manager must serve clients in Europe, the US and other markets at the same time, while political and regulatory expectations diverge.

For a deeper comparison point, read our guide to Norway's sovereign wealth fund.

Is BlackRock good or bad for sustainable investing?

The honest answer is that BlackRock is too large and too internally varied for a simple label. It can be useful, disappointing, disciplined, cautious, influential and conflicted at the same time, depending on the product and the question.

There are three reasonable ways to look at it.

The third view is probably the most useful. BlackRock matters because it sits inside the plumbing of modern investing: index products, ETFs, institutional mandates, risk technology, model portfolios and stewardship. Its public statements are important, but its products, votes and methodologies are more important.

FAQ

Is BlackRock the same as iShares?

No. BlackRock is the asset manager. iShares is BlackRock's ETF platform. Many retail investors encounter BlackRock through iShares funds.

Does BlackRock own the companies in its funds?

Usually no in the ordinary economic sense. BlackRock-managed funds hold shares for clients. The fund investors are generally the beneficial owners. BlackRock may vote those shares where clients have authorised it or where the fund structure gives it that role.

Did BlackRock abandon ESG?

No. BlackRock left NZAM and reduced the visibility of its own climate-alliance commitments, but it still manages ESG, sustainable and climate-aware products for clients. The better description is a shift from public climate leadership to quieter, client-led implementation.

Why does BlackRock's voting record matter?

Because passive funds often hold companies for as long as those companies remain in the index. If selling is not the main tool, voting and engagement become more important.

Should UK investors avoid BlackRock?

That depends on the investor, product, cost, holdings, sustainability objective and personal circumstances. This article is not a recommendation. The useful step is to check which BlackRock or iShares product you hold, what it tracks, what it excludes and how stewardship works.

Useful source links

• BlackRock Q1 2026 results
• BlackRock Q1 2026 earnings supplement
• BlackRock NZAM withdrawal letter excerpt
• NZAM January 2025 review update
• NZAM next chapter update
• Larry Fink 2020 letter: A Fundamental Reshaping of Finance
• BlackRock Investment Stewardship reports
• Texas Attorney General lawsuit announcement

Bottom line

BlackRock is not the simple ESG hero suggested by some early climate-finance coverage, and it is not the simple ESG villain described by some critics. It is the world's largest asset manager, operating across conflicting client demands, regulatory systems and political pressures.

The shift since 2022 is real. BlackRock has moved away from visible public climate leadership and toward quieter client-led implementation. For UK investors, the practical question is not whether BlackRock has a perfect ESG position. It is whether the BlackRock or iShares products inside a pension, ISA or portfolio do what the investor thought they did, at a cost and risk level the investor understands.