Portfolio diversification is easy to talk about and hard to measure.

Most portfolios look diversified on the surface. A few ETFs, maybe some stocks, maybe a bond fund. But once you look at how the positions actually move together, the picture often changes. Five holdings can behave like two bets. A "defensive" position can stop hedging when rates move. Two ETFs with different names can be almost the same exposure.

We built Diversification Analysis to make that visible.

What we added

The new tool analyzes your whole portfolio, not just one symbol at a time. It looks at correlations between positions, effective asset count, diversification ratio, portfolio clusters, and low-correlation candidates you can add.

The first thing you see is a plain-English summary of the portfolio. It names the specific positions that are helping or hurting diversification, and explains the trade-off in normal language. Metrics are useful, but sometimes you need the tool to say: these three holdings are mostly doing the same job.

Below that, the tool groups positions into correlation clusters. This is where redundant holdings become obvious. If a portfolio has several large-cap growth ETFs, they may sit in the same cluster even if their issuer, name, and category labels are different.

We also added diversification metrics across multiple periods. Effective asset count shows how many independent bets your portfolio really has. Diversification ratio shows how much volatility reduction you get from combining the assets. Seeing those numbers over 1Y, 3Y, 5Y, 10Y, and all-time helps catch drift. A portfolio can become less diversified without any transaction, simply because correlations changed.

New candidates, not generic lists

The tool now surfaces ETF and stock candidates that historically moved differently from your current holdings.

This is not a generic "top ETFs" list. Candidates are filtered by correlation to the actual portfolio, then by quality. For ETFs we avoid inverse and leveraged products and require meaningful assets under management. For stocks we focus on larger companies and include risk / return rank, so the list is not just "lowest correlation at any cost."

You can add a candidate directly into the portfolio input, rerun the analysis, and see what changed. That makes the workflow much more practical. Instead of guessing whether a commodity ETF, short-duration bond ETF, or defensive stock helps, you can test it against the current portfolio structure.

Why this matters for optimization

Portfolio Optimization works better when the input universe is sane.

If you feed an optimizer five highly correlated ETFs, it can still produce nice-looking weights. But the result may be mostly a reshuffle of the same exposure. The optimizer is not magic. It can only choose from the assets you give it.

Diversification Analysis helps before optimization. Use it to remove duplicates, spot clusters, and find candidates with genuinely different return drivers. Then run optimization on a cleaner universe.

This creates a better workflow:

1. Start with Diversification Analysis.
2. Remove obvious overlap.
3. Add a few low-correlation candidates.
4. Run Portfolio Optimization.
5. Validate the optimized result with walk-forward backtesting.

That sequence is more useful than optimizing first and trying to explain the result afterward.

A few ways to use it

You have a 3-5 ETF portfolio and want to know what is missing. Run Diversification Analysis, look at the clusters, then check ETF candidates. If all holdings behave like equity beta, the tool will usually make that obvious.

You are preparing a portfolio for optimization. Before running HRP, Risk Parity, or Mean-Variance Optimization, use the clusters to remove duplicates and add assets with different behavior. The optimization result should be more stable because the input set is better.

You are reviewing an existing allocation after market conditions changed. Correlations are not fixed. The 1Y view may show that a hedge is no longer doing what you expected, while the longer windows show whether this is temporary or structural.

Try Diversification Analysis with your portfolio

You know you should diversify. But finding what actually moves differently from what you already own has always been surprisingly hard. We added Diversifiers to help with that.

What we added

Every ETF and mutual fund on PortfoliosLab now has a Diversifiers page. Open a fund (for example, SMH) and you can see ETFs, mutual funds, and individual stocks that historically moved differently from it.

The page focuses on correlation across 1-year, 3-year, and 5-year windows. That matters because correlation is not fixed. Two assets can look independent over one period and start moving together later. Seeing several time windows helps you spot whether a diversifier is stable, improving, or becoming less useful.

Each page includes a data summary highlighting how many low-correlation funds exist for a given symbol, which asset categories dominate the list, and whether correlations are strengthening or weakening over time. For example, SMH currently has 73 ETFs with low correlation, 13 of which are negatively correlated — and the results go well beyond the obvious bond funds. Scroll past the treasuries and you will find oil, commodities, shipping, energy equities, and dividend funds that all move independently from semiconductors.

Low correlation alone is not enough. A fund can appear uncorrelated simply because it is poorly managed or drifting from its benchmark. Every result on the Diversifiers page includes PortfoliosLab's Risk / Return Rank, which scores funds on risk-adjusted performance. That way you are looking at assets that move differently and are still worth owning on their own.

For stocks, we show U.S. companies with at least $1B market cap that move independently from the fund you are researching, together with sector context and the same Risk / Return score.

Behind the scenes, we recalculate millions of correlation pairs daily across 3,000+ ETFs, mutual funds, and large-cap stocks. Every page reflects the latest available data, not a static snapshot.

Why this matters

Having many positions is not the same as being diversified.

You can hold five large-cap growth ETFs and still have one big bet. You can add another fund that looks different by name, but behaves almost exactly like what you already own. Your broker will show another line in the account. It will not tell you whether the new position actually reduces portfolio risk.

Diversifiers starts from the asset you already know and answers the next question: what can I pair with this that brings a different return driver?

That is useful when you are building a long-term portfolio and want fewer assumptions. Not "I think this should diversify me", but "this has historically moved differently, and I can see how stable that relationship has been."

A few ways to use it

Complement a core holding. You hold a broad U.S. equity ETF and want to add something that is not just another version of the S&P 500. Open its Diversifiers page and look for funds with consistently low correlation across multiple periods.

Find independent stock ideas. You want stocks that behave differently from a fund you own. Use the low-correlation stocks table as a starting point, then compare anything interesting before adding it to your portfolio.

Already checked a fund's Alternatives? Diversifiers answer the opposite question — not what to swap, but what to pair.

Availability

Diversifier pages are live for every ETF and mutual fund on PortfoliosLab. Free users can preview the top results. Pro users get full ranked lists with correlation trends across 1Y, 3Y, and 5Y.

Try it now: SMH Diversifiers →

We just made it easier to find better ETFs and mutual funds in the same category. Instead of opening a dozen tabs and running screeners, you can now see all the relevant alternatives ranked by the things that actually matter — like expense ratio, risk-adjusted returns, and drawdown — right on the fund's page.

What we added

Every ETF and mutual fund on PortfoliosLab now has an Alternatives page. Open any fund — say, VOO — and you'll see a breakdown of similar funds from the same category, ranked by the things that actually matter when choosing between them.

The page is split into five sections, each answering a different question:

Cheapest alternatives — same category, sorted by expense ratio. If you're paying 0.50% and there's a nearly identical fund at 0.03%, you should know about it.

Best risk-adjusted alternatives — ranked by PortfoliosLab's combined score that accounts for volatility, drawdown, and return consistency over one year. Not just "what went up the most" but "what went up without falling off a cliff."

Top performing (YTD) — straightforward year-to-date returns. Useful for spotting momentum, less useful on its own.

Lowest volatility and lowest drawdown — for when your goal is sleeping through a correction, not chasing returns.

Below the ranked tables, you'll also see funds from the same issuer and a list of what other investors commonly compare with the fund you're looking at — based on real usage data, not editorial picks.

The alternatives page starts from the fund you're already researching and surfaces what you'd find if you spent an hour digging through screeners — ranked, filtered to the same category, and ready to compare side by side. Each row links directly to a full head-to-head comparison if you want to go deeper.

A few ways to use it

You hold a broad-market ETF and want to check whether a cheaper option exists in the same category. Open its alternatives page and look at the expense ratio table.

You're evaluating a fund someone recommended and want to see how it stacks up on risk. Check the risk-adjusted and drawdown tables to see where it falls relative to peers.

You want to understand what else is out there before committing to a position. Scan the full page, then compare directly with anything that catches your eye.