iShares Paris-Aligned Climate Optimized MSCI World ex USA ETF (PABD)

PABD holds a globally diversified portfolio of large and mid-cap companies from developed countries outside the US—Europe, Japan, Australia, Canada, and Singapore among them—but with a deliberate tilt toward businesses that score well on environmental metrics and have credible plans to cut carbon emissions.

The fund tracks an index called the MSCI World ex USA, a broad collection of roughly 1,800 stocks across all developed markets except America. But PABD does not hold all of them equally. Instead, the index methodology applies a climate screen: it removes companies that derive heavy revenue from thermal coal, fossil fuels without decarbonization plans, or other high-emission activities. It then overweights companies that have set science-backed net-zero targets and are demonstrably making progress toward them. The result is a narrower, differently-weighted portfolio than a simple market-cap index.

The fund is issued by BlackRock’s iShares division and trades on NASDAQ under the ticker PABD. It is a standard exchange-traded fund, not leveraged or inverse, and not an exchange-traded note. You own shares that hold the underlying stocks directly.

How it invests and rebalances. PABD follows the MSCI index mechanically; there is no active stock-picking. The fund rebalances quarterly as the index rules designate. Because the climate screen excludes and overweights companies based on their ESG and emissions metrics, PABD’s sector composition differs from a traditional world-ex-USA fund. You have lighter exposure to traditional energy and utilities, and different weights in industrials, financials, and health care depending on how well those companies score on climate metrics. You are also buying fewer total stocks—roughly 600 rather than the full 1,800.

What it costs. The expense ratio typically ranges from 0.25% to 0.35% per year. On a $10,000 position, that is $25 to $35 annually. This covers the cost of the index methodology, trading, and fund administration. It is competitive for an international climate-tilted [fund.

Liquidity](/fund-liquidity/) and trading. PABD trades with decent volume on NASDAQ. You can buy or sell thousands of dollars without moving the market much. Bid-ask spreads are tight—typically a few cents on a share—so you should not face significant slippage entering or exiting.

The style bias. Because PABD tilts toward climate-aligned companies, its returns will diverge from a simple world-ex-USA index. When investors favor sustainably-minded businesses, PABD tends to outperform. When they care less about ESG, PABD may lag. This is not tracking error in the traditional sense; it is intentional style bias, and it is material. Over different market cycles, the performance spread can be several percentage points per year.

Who it fits. PABD makes sense for someone who wants broad international diversification but is uncomfortable owning companies flagged as poor environmental performers. It is transparent and straightforward enough for passive investors building a core holding. You can see exactly which stocks you own and understand why they were included or excluded.

The fund is not ideal for someone seeking maximum diversification; by filtering out certain sectors and companies, it is narrower than a true total-world index. It is also not a trading vehicle; it is built for long-term holding as part of an international-equity allocation.

How to research it. Start with iShares’ factsheet, which lists top holdings, sector weights, and the current expense ratio. The underlying MSCI index methodology document explains exactly how the climate and ESG screens work. Because PABD is passive, most of your work is confirming whether you agree with the index rules and whether the fee is acceptable.

Compare PABD to other international climate or ESG ETFs—offerings from Vanguard or competitors—to judge whether the iShares methodology fits your values. Remember that any ESG index reflects specific assumptions about which companies are “climate-ready.” Reading the screening rules beats trusting the fund name alone.