BlackRock's Rosenberg Puts 20% Outside Stocks and Bonds

Jeff Rosenberg, portfolio manager of BlackRock's systematic alternative ETF, told Bloomberg's Scarlet Fu and Tom Keene on Sept. 25, 2026 that investors cannot declare the 60/40 portfolio back and should broaden to a 50/30/20 allocation that carves out a fifth of the portfolio outside stocks and bonds.

The 60/40 portfolio — 60% stocks, 40% bonds — is the default setting of retail and institutional investing alike. Jeff Rosenberg, portfolio manager of the systematic alternative ETF at BlackRock, is not ready to say it has been restored. Speaking with Scarlet Fu and Tom Keene on "Bloomberg Money" on Friday, Rosenberg argued that conditions in the bond market do not yet justify declaring the classic split healthy again, and that investors should broaden out to a 50/30/20 portfolio instead.

The arithmetic of that shift is simple, and it is worth stating plainly because the headline number hides the actual change. Moving from 60/40 to 50/30/20 takes ten percentage points out of equities and ten out of bonds, and puts the combined twenty into a third bucket — the alternatives sleeve. On an illustrative basis, a portfolio that was 100% stocks-and-bonds becomes 80% stocks-and-bonds, with the remaining fifth doing something else entirely.

Why the 60/40 debate keeps coming back

The case for 60/40 was never really about returns. It was about correlation. Bonds were supposed to rally when equities fell, so the fixed-income sleeve paid for itself in the drawdowns, not in the good years. When that relationship holds, 40% in bonds is cheap insurance. When it breaks — when stocks and bonds fall together — the investor is holding two versions of the same risk and paying for diversification they are not receiving.

That is the crux of Rosenberg's reluctance. Saying "60/40 is back" is a statement about the behavior of bonds relative to stocks, not about the yield on bonds in isolation. Higher yields make the coupon more attractive; they do not automatically restore the hedge. Rosenberg's point in the Bloomberg Markets interview, where he walked through what is happening in bond markets, is that the diversification job needs to be spread across more than one asset class.

What the 20% sleeve is actually for

The third bucket in a 50/30/20 framework is not a return-chasing allocation. It is a correlation allocation. Systematic alternative strategies — the category Rosenberg manages within at BlackRock — are built to produce returns that do not track the equity market cycle: trend-following, carry, relative-value and similar approaches that can be positioned long or short across asset classes rather than simply owning the market.

The pitch is that when stocks and bonds move together in the wrong direction, a sleeve with a structurally low correlation to both does the work that the bond allocation used to do on its own. The trade-off is real and should be named: those strategies are typically more expensive than an index bond fund, harder to explain, and capable of producing losses in periods when both stocks and bonds are doing fine. An investor adopting 50/30/20 is accepting tracking error against a conventional balanced benchmark in exchange for a smoother path when the conventional benchmark misbehaves.

Who this argument is aimed at

Broadly, anyone whose portfolio is on autopilot. That includes target-date funds, model portfolios built off a balanced benchmark, and individual investors who set an allocation years ago and have not revisited the assumption underneath it. The assumption is the negative stock-bond correlation. If that assumption is under review — and Rosenberg's refusal to declare 60/40 back is exactly that review — then the allocation built on top of it deserves a second look, whether or not the answer is 50/30/20 specifically.

The tape on the day the call was made

Rosenberg made the argument during a session in which risk assets were firm, which is the useful context: the case for broadening out is not being made in a panic. As of the last trade at 19:54 GMT on Friday, Sept. 25, 2026, the S&P 500 tracker SPY was at $772.03, up 0.63% on the day from a previous close of $767.18, with a day range of $766.29 to $772.28. The Nasdaq 100 fund QQQ stood at $745.27, up 0.56% against a prior close of $741.10. The Dow tracker DIA led at $517.72, a gain of 0.98% from $512.68, having traded between $512.59 and $517.92.

All three benchmarks were near the upper end of their intraday ranges. That matters to the framing. Allocation arguments made after a bad week tend to be dismissed as recency bias; this one arrived on a broadly green session, with the Dow doing slightly more work than the Nasdaq 100 — a modest rotation signal within a single day, and no more than that.

Turning the allocation into decisions

For an investor who takes the argument seriously, the practical questions are mechanical rather than philosophical.

• Where does the funding come from? A 50/30/20 split funds the alternatives sleeve evenly out of both existing buckets, rather than treating alternatives as a substitute for bonds alone. That distinction matters: funding entirely out of fixed income raises total portfolio risk, which is the opposite of the intent.
• What does the sleeve hold? "Alternatives" spans everything from managed futures to private credit to commodities. The correlation logic only works if the holdings genuinely do not track equities; a high-beta alternative is an equity allocation wearing a different label.
• What is the cost? Expense ratios in the systematic alternative space sit well above index bond funds. The hedge has to earn its fee over a full cycle, not a quarter.
• How long is the review period? These strategies are judged over cycles. Investors who bail after two bad quarters will capture the cost and miss the benefit.

What to watch next

The test of Rosenberg's thesis is not whether bond yields go up or down. It is whether bonds and equities move in the same direction during the next equity drawdown. If they diverge — bonds up, stocks down — the traditional 40% is doing its job and the case for a third bucket weakens considerably. If they fall together again, the argument for carving out a fifth of the portfolio gets made for him.

A second thing to track is flows. Systematic alternative ETFs have made these strategies accessible in a wrapper that ordinary brokerage accounts can buy, which is a change from the era when the same exposures sat behind hedge fund minimums. Whether retail money follows the allocation logic, or waits for a correlation shock to force the issue, will say more about portfolio construction in 2026 than any single strategist's framework.

Frequently asked questions

What did Jeff Rosenberg actually say?

Speaking to Scarlet Fu and Tom Keene on Bloomberg's "Bloomberg Money" on Sept. 25, 2026, Rosenberg said you cannot declare the 60/40 portfolio back, and that investors should broaden to a 50/30/20 allocation. He discussed conditions in bond markets as the reason the traditional balanced split needs supplementing rather than simply restoring.

What is a 50/30/20 portfolio?

It is an allocation holding 50% in equities, 30% in bonds and 20% in a third bucket of alternative strategies. Compared with a traditional 60/40 split, it takes ten percentage points from stocks and ten from bonds and redirects the combined twenty into assets designed to behave differently from both.

Why is the 60/40 portfolio considered under threat?

The 60/40 design depends on bonds rising when stocks fall. When both fall together, the bond allocation stops functioning as a hedge and the investor holds two expressions of similar risk. Higher bond yields improve income but do not by themselves restore the negative correlation that made the structure work.

What goes in the 20% alternatives sleeve?

Typically systematic strategies such as trend-following, carry and relative-value approaches that can take long or short positions across asset classes. The defining feature is low correlation to equities rather than high expected return. Holdings that closely track the stock market defeat the purpose, whatever label they carry.

How were markets trading when the comments aired?

As of the last trade at 19:54 GMT on Sept. 25, 2026, SPY was $772.03, up 0.63% from a $767.18 prior close. QQQ traded at $745.27, up 0.56% from $741.10. DIA stood at $517.72, up 0.98% from $512.68, with all three near the top of their intraday ranges.

What are the drawbacks of adding an alternatives sleeve?

Alternative strategies generally cost more than index bond funds, are harder for investors to evaluate, and can lose money in periods when stocks and bonds are both performing well. They also introduce tracking error against conventional balanced benchmarks, which tests an investor's patience over multi-year holding periods.

Sources

• Can't Say 60/40 Is Back: Rosenberg — Bloomberg Markets