US equity ETFs set record with $191B monthly inflows: Why is global capital still flooding into US markets?

In the first full trading week of August 2026, global capital again cast a vote of confidence in US stocks with real money. According to State Street Global Advisors, ETFs listed in the United States saw net inflows of roughly $189 billion to $193 billion in July, one of the strongest monthly performances in industry history; by end-July, year-to-date net inflows had approached $1.3 trillion, surpassing the full-year 2025 record several months ahead of schedule. Meanwhile, Vanguard's VOO, which tracks the S&P 500, became the world's first ETF to exceed $1 trillion in assets, and Invesco QQQ alone raked in $4.95 billion in a single trading day. Behind these striking numbers lies the most direct answer in 2026 to the question “Why buy US stocks?”

Monthly inflows of $191B: US equity ETFs deliver the “strongest July ever”

According to industry data, US-listed ETFs saw net inflows of about $191.3 billion in July, with more than 70% going to equity products; large-cap index funds, international equity ETFs, and thematic strategies such as semiconductors and artificial intelligence were the main magnets. Fixed-income ETFs attracted more than $51 billion in the same period. At this pace, State Street forecasts total US ETF inflows could exceed $2.3 trillion in 2026, leaving the 2025 record far behind.

Concentration was also striking. In July alone, Vanguard S&P 500 ETF (VOO) saw net inflows of nearly $20 billion, followed by State Street SPDR S&P 500 ETF (SPY) at about $14 billion, and SPDR Portfolio S&P 500 ETF (SPYM) at over $8 billion. The indexing wave is reshaping global asset allocation at an unprecedented pace—when investors cannot tell which single stock will outperform, “buying the whole market” becomes the most rational choice.

Trillion-Dollar Milestone: The Indexing Wave Behind VOO

In early June, VOO officially surpassed $1 trillion in assets, becoming the first trillion-dollar ETF in history. The milestone was no accident: VOO charges an expense ratio of just 0.03%, has posted positive inflows every year since its 2010 launch, and recorded annual net inflows above $100 billion in both 2024 and 2025. By early June, it had absorbed more than $69 billion year to date, while the S&P 500 rose more than 10% during the same period. Low fees, high liquidity, transparent holdings, and the long-term compounding effect of “passive is active” have made VOO a “ballast” allocation tool chosen by retail and institutional investors worldwide.

Notably, the birth of the trillion-dollar ETF coincided with sustained inflows of “buy-the-dip” capital. In July, the market went through a tech deleveraging adjustment, but the pullback became a window for adding positions, highlighting the powerful appeal of “dips as buying opportunities” to global capital amid the long US bull market.

$4.95B in One Day: QQQ and “Big Tech Faith”

The latest flow details further confirm investor preferences. In a trading session in early August, Invesco QQQ saw net inflows of $4.95 billion, far exceeding other ETFs; iShares Core S&P 500 ETF (IVV) followed with $1.39 billion, while the small-cap Russell 2000 ETF saw net outflows of about $1.4 billion. The pattern clearly shows that even amid earnings season and macro uncertainty, global capital remains firmly betting on US large-cap growth stocks led by the “Magnificent Seven.”

Korea echoes this trend. After local regulators tightened single-stock leveraged ETF rules, Korean retail investors flocked to US leveraged ETFs and US cash equities, buying about $4.67 billion of US stocks in July—the second-highest monthly level of the year—with the semiconductor 3x leveraged ETF (SOXL) topping buy lists. In Southeast Asia, online brokers in Thailand and Indonesia are sharply lowering barriers to US stock investing through localized payments and commission-free trading, making cross-border allocation to dollar assets ever easier.

Earnings Season Rekindles “AI Faith”: Earnings Are the Underlying Magnet

Behind the frenzy is far more than speculative sentiment. FactSet data show analysts expect S&P 500 second-quarter earnings to grow about 47.4% year over year, the strongest pace in nearly five years; despite high expectations, roughly 90% of tech companies beat earnings estimates, and analysts keep raising forecasts. Hyperscalers' cloud backlog orders surged more than 150% year over year to about $1.7 trillion, far outpacing the roughly 80% rise in capital expenditures—meaning massive AI investment is moving from “investment phase” to “payoff phase” and beginning to convert into real revenue and cash flow.

Strong earnings ignited the early-August rally. Over the past four trading days, the Nasdaq 100 climbed 9.3%, adding $3.5 trillion in market value—the largest four-day gain since April 2025; SanDisk rose 41%, Palantir 32%, Microsoft 26%, and Google and Nvidia each gained 11%. Goldman Sachs data show single-day volume in SPX call options topped 4 million contracts, an all-time high, while put/call skew posted its biggest drop in nearly a decade—the market has entered a positive-feedback phase of “buying more as it rises.” Meanwhile, the Fed held rates steady in early August, and the Atlanta Fed's GDPNow model raised its Q3 US GDP growth estimate to near 6%. The combination of accelerating growth, improving earnings, and easing policy risk provides solid support for risk assets.

Valuations also deserve attention. After the July pullback, the S&P 500 information technology sector's forward P/E fell to about 20x—the 1st percentile of its historical valuation range—below the roughly 23x average of the past decade. JPMorgan estimates that if large-cap tech valuations revert to historical averages, potential upside could reach 30% to 56%. Earnings growth outpacing valuation expansion means this rally is more fundamentally driven than a pure liquidity bubble.

A Southeast Asian Investor Lens: Why US Stocks Remain the “Ballast” of Global Allocation

For investors in Thailand and Southeast Asia, the appeal of US stocks can be understood along these dimensions:

• Market depth and breadth: US markets host the world's largest universe of listed companies, spanning nearly every frontier industry from AI chips and cloud computing to innovative drugs and aerospace—enabling global tech allocation within a single market.
• Liquidity and trading mechanics: US daily turnover leads the world, with pre/post-market trading and fractional shares, plus mature derivatives like options and leveraged ETFs, offering vast strategic flexibility.
• Investment tool diversity: From 0.03% fee index ETFs to sector-thematic and active ETFs, products like VOO and QQQ let ordinary investors share in US corporate earnings growth at very low cost.
• Institutions and transparency: Strict financial disclosure, mature investor protection, and the dollar's global reserve status make US assets a natural choice for diversifying local-currency risk and hedging regional volatility.
• Verifiable earnings drive: This earnings season again shows that US stock gains are fueled by corporate profit growth, not just multiple expansion; AI commercialization provides a trackable fundamental anchor for long-term returns.

Risk Warnings and Outlook

Of course, the flip side of the capital frenzy is rising risk. Clear divergence has emerged within tech giants, with the market rewarding companies that prove real AI revenue and punishing those with unclear return paths; the performance gap between stocks in the index once widened to 61 percentage points. The Strait of Hormuz situation, resurgent inflation, and the Fed's policy path remain overhanging variables. Goldman Sachs also warns that despite rapid capital replenishment in August, institutional positioning remains below historical norms, and volatility could rise sharply in chasing strength.

Over the medium to long term, as long as the US earnings growth trend remains intact, the status of US stocks as the world's core risk asset will be hard to challenge. For Southeast Asian investors, instead of chasing highs and selling lows at emotional peaks, it is wiser to build positions gradually through ETFs and hold long-term, participating in this US bull market driven by earnings and the AI revolution with an “allocation mindset” rather than a “gaming mindset.”