Largest BlackRock fixed income funds worldwide in June 2026, by net assets

Leading fixed income funds owned by BlackRock worldwide as of June 17, 2026, by net assets under management

BlackRock is the worlds largest asset manager and the largest manager of bond funds, dominated by its iShares fixed income ETFs. This report ranks the largest BlackRock fixed income funds worldwide in June 2026 by net assets, led by a single broad market bond fund. BlackRock runs the largest fixed income ETF business in the world, with its iShares bond funds together holding well over a trillion dollars, so the ten funds ranked here are only the biggest names in a much wider lineup of bond products.

At the top sits the iShares Core U.S. Aggregate Bond ETF, with around 136 billion dollars in net assets, far ahead of Treasury, municipal and corporate bond funds. This completes the picture alongside our largest BlackRock alternative funds ranking and our largest BlackRock equity mutual funds analysis.

One fund on top: the iShares Core U.S. Aggregate Bond ETF, at around 136 billion dollars, towers over every other BlackRock bond fund. Treasury, municipal and corporate funds follow, each far smaller.

Most of these funds are low-cost index ETFs that track bond benchmarks, with one large actively managed bond fund in the mix. The firm wider ETF range is set out in our largest BlackRock equity ETFs and iShares ETF overviews.

A note on the data. The figures cover BlackRock bond ETFs and mutual funds, ranked by net assets and combining all share classes. They are approximate, drawn from iShares and industry data, and move with markets and interest rates, so the exact ranking shifts over time. Bond fund values move with interest rates as well as inflows: when yields rise, the prices of existing bonds fall, and when yields fall, they rise, so the net assets of these funds shift constantly even before any new money arrives.

BlackRock, the Worlds Largest Bond Fund Manager

Fixed income is one of the largest parts of the BlackRock business. The firm runs the worlds biggest bond ETF franchise, and its largest bond fund alone holds around 136 billion dollars, more than the entire top ten of its alternative funds combined. The U.S. bond market is enormous, worth well over 28 trillion dollars, and the Aggregate Bond ETF aims to capture the broad investment-grade portion of it, giving a single fund exposure to thousands of Treasury, mortgage and corporate bonds at once.

Unlike its small, high-fee alternative funds, BlackRock bond funds are large and cheap, charging as little as 0.03 percent. This scale reflects the firm dominance of index investing, as our BlackRock assets under management overview shows.

The contrast captures two sides of the same firm. In bonds, as in stocks, BlackRock built enormous scale through low-cost index funds, giving ordinary investors cheap access to the entire bond market in a single trade. This is the same playbook BlackRock used in equities through iShares: build huge, cheap index funds that become default holdings for millions of investors, then earn steady fees on enormous pools of assets rather than high fees on small ones.

Largest BlackRock Fixed Income Funds by Net Assets

The table lists the largest BlackRock fixed income funds by net assets in 2026, with each fund as a share of the top ten total. It shows how the Aggregate Bond ETF alone makes up nearly a third of the assets, well ahead of the Treasury and municipal funds. Sorting any column reveals the full order. The Aggregate Bond ETF holds the top spot by a wide margin, with Treasury funds of different maturities, a large municipal fund and one sizable active fund filling out the rest of the list, each serving a distinct role in investor portfolios.

Largest BlackRock Fixed Income Funds by Category

By category, the largest BlackRock fixed income funds split into a few clear groups: broad aggregate funds, Treasury and inflation-linked funds, municipal funds, corporate funds, mortgage-backed funds and one large active multi-sector fund. The broad aggregate fund leads by far. Treasury funds are split by maturity, from the 1-to-3 year fund used as a near-cash holding to the 20-year-plus fund that swings sharply with interest rates, letting investors dial their exposure to rate moves up or down as they choose.

The Aggregate Bond ETF anchors the broad group, while Treasury funds of different maturities make up the next largest block. Municipal, corporate and mortgage funds round out the list, a spread explored in our BlackRock AUM by asset class analysis.

Broad market leads: aggregate funds hold the most assets, led by the Aggregate Bond ETF, followed by Treasury and inflation-linked funds, the large active fund, corporate, municipal and mortgage-backed funds.

This mix reflects how investors use bond funds. Many want a single broad fund covering the whole market, while others choose specific slices such as Treasuries for safety, municipals for tax-free income or high yield for extra return. Municipal funds appeal mainly to higher-income investors because their interest is often free of federal tax, while high yield funds take on more credit risk in exchange for higher income, showing how different bond funds suit very different needs.

Big Funds, Low Fees

BlackRock bond funds are mostly very cheap. The Aggregate Bond ETF charges just 0.03 percent, and most of the index funds charge under 0.20 percent, while the single large active fund charges around 0.62 percent for hands-on management. The Aggregate Bond ETF carries a Morningstar Gold rating and is measured against more than four hundred intermediate core bond funds, a sign of how dominant and well-regarded this single low-cost fund has become in its category.

Plotting each fund net assets against its expense ratio shows the largest funds are also the cheapest, the opposite of the alternatives business. Low fees and large size go together in index investing, a pattern drawn out in our leading fund managers ranking.

Big and cheap: each bubble is a fund, placed by its expense ratio and net assets. Unlike alternatives, the largest bond funds are also the cheapest, with the broad index fund charging just 0.03 percent.

This is the core appeal of bond index funds. Investors get broad, diversified exposure to the bond market at very low cost, which has made these funds some of the most popular ways to own bonds and a major source of inflows in recent years. The handful of pricier funds on the list, such as the high yield fund and the active Strategic Income fund, charge more because they require active credit research or trading, but even those fees remain modest next to private market funds.

Net Assets and Fees of the Largest Funds

Pairing net assets with fees shows that BlackRock largest bond funds are both big and inexpensive. The index funds charge between 0.03 and 0.19 percent, a tiny fraction of the cost of active management or alternative funds. Over a long holding period, the gap between a 0.03 percent index fund and a pricier active fund can add up to a meaningful sum, which is one reason cheap bond ETFs have steadily drawn money away from costlier active bond funds.

The Aggregate Bond ETF charges 0.03 percent on around 136 billion dollars, while the active Strategic Income fund charges far more on a smaller base. These low fees are central to the appeal, a cost structure examined in our BlackRock AUM by asset class overview.

Low-cost scale: the bars show net assets while the line shows the expense ratio. The index funds charge 0.03 to 0.19 percent, a tiny fraction of the cost of active or alternative funds.

This is why index bond funds have grown so fast. Low fees compound into better long-term returns, and investors have steadily moved money from pricier active bond funds into cheap index ETFs that simply track the market. The active Strategic Income Opportunities fund, run with a flexible, go-anywhere approach, is the main exception, attracting investors who want a manager to navigate shifting bond markets rather than simply track a fixed benchmark.

How the Largest Funds Have Grown

The largest BlackRock bond funds have grown strongly over the past several years, helped by rising bond markets and heavy inflows. Comparing net assets in 2020 with 2026 shows the biggest funds expanding sharply as investors poured money into fixed income. The growth was helped by a historic shift: as interest rates climbed from near zero in 2022, bonds finally offered real yields again, pulling money back into fixed income after years when low rates made bonds far less appealing to savers.

The Aggregate Bond ETF grew from around 80 billion dollars in 2020 to around 136 billion by 2026, while Treasury and municipal funds also climbed. This steady growth contrasts with the firm equity mutual funds, as our leading BlackRock multi-asset funds coverage shows.

Steady growth: comparing 2020 with 2026, the largest bond funds grew strongly, led by the Aggregate Bond ETF from around 80 to 136 billion dollars, helped by higher yields and heavy inflows.

The pattern shows how higher interest rates have revived bond funds. With yields back at attractive levels, investors have rediscovered bonds for income and safety, driving large inflows into the biggest, cheapest bond ETFs. Bond ETFs in particular saw record inflows in 2024 and 2025, as investors used them to lock in higher yields quickly and cheaply, a trend that pushed the largest funds to new size records across the industry.

How Concentrated the Assets Are

BlackRock bond fund assets are concentrated at the top. The Aggregate Bond ETF alone holds nearly a third of the assets in the top ten, and the top three funds together hold more than half. The dominance of the broad aggregate fund reflects a simple investor preference: many people want one fund that owns the whole bond market, rather than the work of choosing among Treasury, corporate, municipal and mortgage funds themselves.

This concentration shows how a few flagship funds dominate, led by the broad aggregate fund. The Aggregate Bond ETF and the large Treasury and municipal funds carry most of the weight, a pattern our number of BlackRock funds overview notes.

Top-heavy: the Aggregate Bond ETF alone holds nearly a third of the assets in the top ten, and the top three funds together hold more than half. A single broad fund anchors the lineup.

The result is that BlackRock bond business rests heavily on its broad market fund. Outside the top few, the funds cover narrower slices of the market, underlining how much investors favour simple, all-in-one bond exposure. The narrower funds, covering high yield, inflation-linked bonds or specific maturities, are smaller because they serve more specialised needs, used by investors who want to fine-tune their exposure rather than hold the whole market.

The Bond Lineup by Category

Grouping the funds by category shows where the money sits. Broad aggregate funds hold the most, followed by Treasury and inflation-linked funds, then the active fund, corporate, municipal and mortgage-backed funds. The 20-year-plus Treasury fund is among the most actively traded, used by investors to bet on falling interest rates, while the short Treasury fund acts almost like cash, showing how the same Treasury category spans very different uses.

The strength of the aggregate group reflects demand for simple, diversified bond exposure, while the large Treasury block shows investors using government bonds for safety and yield. The breadth echoes our asset manager statistics overview.

A clear profile: across the categories, broad aggregate and Treasury funds dominate, with the active fund, corporate, municipal and mortgage-backed funds making up the smaller, more specialised remainder.

This segment view captures both the concentration and the variety of the range. One broad fund holds most of the money, but BlackRock runs large funds across Treasuries, corporates, municipals and mortgages, giving it a complete bond lineup. The mortgage-backed fund gives exposure to home loan bonds, a large and distinct part of the U.S. market, while the corporate funds lend to companies, together rounding out a lineup that covers every major slice of the bond universe.

The Rise of the Aggregate Bond ETF

The iShares Core U.S. Aggregate Bond ETF has grown steadily over the years. From around 40 billion dollars in the mid-2010s, its net assets climbed to around 136 billion by 2026, more than tripling over the decade. The fund tracks the Bloomberg U.S. Aggregate Bond Index, holding thousands of individual bonds across Treasuries, mortgage-backed securities and investment-grade corporates, which gives it the broad, diversified profile that long-term investors prize.

Heavy inflows and higher bond yields drove the climb, especially as interest rates rose from 2022 onward and bonds became attractive again. The fund growth tracks the path of interest rates, set out in our federal funds rate overview.

A steady climb: the Aggregate Bond ETF grew from around 40 billion dollars in the mid-2010s to around 136 billion by 2026, more than tripling as investors used it as a core, all-in-one bond holding.

The fund long rise shows how a broad, cheap bond ETF grows: through steady inflows from investors seeking simple, low-cost exposure to the entire bond market, in good times and bad. Its growth has been remarkably steady because it is treated as a core building block: investors add to it through good markets and bad, using it as the bond anchor of a balanced portfolio rather than a tactical, in-and-out trade.

How the Funds Performed in 2026

Bond fund returns in 2026 varied widely by type. With interest rates still high, short-dated and credit funds delivered solid total returns, while long-dated Treasury funds lagged as their prices fell when yields rose. The 20-year-plus Treasury fund is the most rate-sensitive, with a duration of around 17 years, meaning a one percent rise in long-term yields can knock roughly seventeen percent off its price, which is why it swings so much from year to year.

High yield and corporate funds led, helped by strong income, while the long Treasury fund posted a small loss as rising yields hurt long bond prices. These swings reflect interest rate moves, a theme in our leading BlackRock funds by NAV return analysis.

Duration decides: in 2026 high yield and credit funds led on total return, while the 20-year-plus Treasury fund posted a loss as rising long-term yields pushed long bond prices down.

The spread shows why investors hold a mix of bond funds. Short and credit funds cushion against rising rates, while long Treasury funds can surge when rates fall, so the right blend depends on the outlook for interest rates. This is why duration matters so much in bond investing: longer-dated funds offer bigger gains when rates fall but bigger losses when rates rise, while short-dated funds stay steady, a trade-off every bond fund investor has to weigh.

The Income Bond Funds Pay

Yields are the main reason investors buy bond funds, and in 2026 they were attractive. High yield and corporate funds offered the richest yields, while the broad aggregate fund yielded around 4 percent and Treasury funds a little less. In June 2026 the ten-year Treasury yield sat at around 4.46 percent, well above the near-zero levels of a few years earlier, which is what made bond funds attractive again and pulled large inflows back into fixed income across the market.

After years of near-zero rates, bond funds once again pay meaningful income, which has drawn large inflows. Higher yields have made fixed income competitive with cash and stocks, a shift that benefits the largest managers, as our largest asset managers coverage notes.

Income is back: after years of near-zero rates, bond funds again pay meaningful yields, with high yield and corporate funds offering the most and the broad aggregate fund yielding around 4 percent.

These yields are the heart of the appeal. For income-focused investors, a diversified bond fund yielding around 4 to 6 percent offers steady cash flow with far less risk than stocks, which is why bond funds have attracted so much money. Higher yields also give bonds more room to cushion a portfolio: if the economy weakens and rates fall, today higher-yielding bonds can deliver solid gains, restoring the traditional role of bonds as a counterweight to riskier stocks.

Bonds Within a Bigger Firm

Even the largest BlackRock bond funds sit within a far bigger firm. The Aggregate Bond ETF, at around 136 billion dollars, is large but still smaller than the firm biggest equity ETF, which holds around 800 billion. Fixed income sits alongside equities, multi-asset and alternatives as one of the four main pillars of the BlackRock business, and while equities are larger, the bond franchise is among the fastest to attract new money when interest rates are high.

This matters because it shows the balance of the business. Equities remain the largest single block, but fixed income is a huge and growing part of the firm, as our asset management overview coverage underlines.

Size and strategy go together here. Bond funds are large because investors want cheap, broad fixed income exposure, and BlackRock built the biggest bond ETF franchise in the world to meet that demand. The firm fixed income reach also extends beyond funds into its Aladdin risk platform, used across the industry to manage bond portfolios, and into cash and money market products, making BlackRock a central player in nearly every corner of the fixed income world.

Largest BlackRock Fixed Income Funds: The Big Picture

Taken together, the largest BlackRock fixed income funds show a clear pattern: one broad aggregate fund dominates, followed by Treasury, municipal and corporate funds, almost all cheap index ETFs. The ranking underlines how completely index funds have reshaped bond investing, with cheap, broad ETFs now the default way most people own bonds, just as they have become the default way to own stocks over the past two decades.

These funds are central to how millions of people own bonds, offering broad exposure at very low cost. The contrast with the firm small, high-fee alternative funds could hardly be sharper, a divide also seen across our largest ETFs by market cap coverage.

For BlackRock, fixed income is a vast, low-margin but high-volume business. It serves investors who want simple, cheap, diversified bond exposure, and it cements the firm position as the largest bond fund manager in the world. The scale brings influence too: as a major holder of many bonds through its funds, BlackRock plays a quiet but important role in how the bond market works day to day, from pricing and trading to the design of new fixed income products.

Taken together, the data shows that BlackRock fixed income assets are concentrated in a few broad funds, led overwhelmingly by the Aggregate Bond ETF at around 136 billion dollars. Treasury, municipal and corporate funds fill out the rest of the top ten, set against the wider market leaders in our biggest companies by market value overview.

Whether measured by size, cost or yield, the largest BlackRock fixed income funds tell the same story: cheap, broad index funds have become the default way to own bonds. From one 136 billion dollar aggregate fund to a full range of Treasury, corporate and municipal funds, the lineup makes BlackRock the largest bond fund manager in the world.

Frequently Asked Questions: Largest BlackRock Fixed Income Funds