Brown Advisory Q1 2026: $71.68B Active Book

TL;DR: Brown Advisory's Q1 2026 13F filing shows a $71.68B active manager book with Microsoft at $5.20B, five mega-cap or platform names above $2.10B, and enough breadth that the top 10 still account for only 32.02% of reported value. The filing was Form 13F-HR filed 2026-02-13, accession 0001345929-26-000018, for reportDate 2025-12-31.

That mix matters because Brown Advisory is not an index complex or market-maker inventory book. It is a Baltimore-based active investment management and strategic advisory firm; in February 2026 the firm also announced a new Global Value Select capability and said it oversaw approximately $173.5 billion in client assets across affiliated entities as of December 2025. The 13F slice analyzed here is the U.S.-listed equity disclosure: $71.68B in canonical 13F AUM and $70.51B in summed disclosed holdings.

The central read is disciplined scale rather than single-stock dependence. Microsoft alone is the largest disclosed position, but at 7.37% it does not dominate the book. Visa, Alphabet, Amazon, Nvidia, Taiwan Semiconductor, Mastercard and Intuit fill out a quality-growth core, while the concentration chart shows a deep long tail below the top positions.

What the Q1 2026 filing says first

Brown Advisory reported 500 consolidated current positions in the article data set, with a $71.68B canonical AUM figure and a 60.25 WhaleScore. The SEC time anchor is important: this is the Q1 2026 filing event, filed 2026-02-13, using the 2025Q4 report date. In plain English, investors are looking at Brown Advisory's year-end 2025 holdings as disclosed to the market during Q1 2026.

The top of the portfolio reads like an active quality-growth ledger. Microsoft (MSFT) is the largest position at $5.20B and 7.37%; Visa (V) follows at $2.59B and 3.68%; Alphabet's GOOG line is $2.38B and 3.37%. Amazon, Nvidia, Taiwan Semiconductor, Mastercard and Intuit extend that same durable-growth theme.

Concentration: big platform bets without a one-stock portfolio

The most useful number is not only the $5.20B Microsoft stake. It is the spread around it. The first five positions together account for 20.44% of the disclosed holdings value, and the top 10 account for 32.02%. That is concentrated enough for position selection to matter, but not so concentrated that the filing is simply a Microsoft or Nvidia proxy.

The portfolio's payment-network exposure is especially visible: Visa at $2.59B and Mastercard at $1.80B both sit inside the top 10. Combined with Microsoft, Alphabet, Amazon, Nvidia and Taiwan Semiconductor, Brown Advisory's disclosed book is tilted toward scalable platforms with high operating leverage rather than a broad market replica.

The AUM path shows a reset from the 2024 peak

The history line adds context to the current snapshot. Brown Advisory's reported 13F value moved from $74.80B in 2024Q1 to a $79.64B high in 2024Q3, then slipped to $78.84B in 2024Q4, $69.97B in 2025Q1, recovered to $76.82B in 2025Q3, and ended the shown sequence at $71.68B in 2025Q4. The final sequential move in the brief is -6.7%.

For readers using 13F AUM drops as a signal, this is the distinction that matters: a lower reported total does not automatically mean the manager abandoned equities. The filing still shows large positions in Microsoft, Visa, Alphabet, Amazon and Nvidia, while the portfolio remains diversified across hundreds of disclosed lines.

How to read the active-manager signal

Brown Advisory's filerType is currently null in the platform data, which means unclassified rather than passive. The business profile, ownership model and disclosed active strategies support treating it as an active manager for research purposes, not as a passive index sponsor. That matters for language: the positions can be interpreted as portfolio construction choices, though 13F timing still limits real-time conclusions.

The strongest signal is quality-growth persistence. Microsoft, Visa, Alphabet, Amazon and Nvidia are not obscure discoveries, but Brown Advisory's allocation sizes show where the manager was willing to let established compounders remain meaningful in a large, diversified public-equity book. The rest of the article data set shows 500 current consolidated positions, so the top-heavy names sit inside a broader wealth and institutional portfolio architecture.

Investor takeaway

Brown Advisory's Q1 2026 filing is best read as a large active manager leaning on platform quality while keeping the overall 13F book diversified. The $71.68B headline figure is not the whole story; the more actionable point is the balance between a $5.20B Microsoft anchor, payments exposure through Visa and Mastercard, and a long tail that keeps the top 10 at 32.02% of reported value.

Use the Brown Advisory filer page to monitor the next filing, compare the AUM path, and check whether Microsoft, Visa, Alphabet, Amazon and Nvidia remain the portfolio's core disclosed signals.

FAQ

What does Brown Advisory hold in Q1 2026?

Brown Advisory's Q1 2026 13F filing shows Microsoft as the largest disclosed position at $5.20B, followed by Visa at $2.59B, GOOG at $2.38B, Amazon at $2.15B and Nvidia at $2.10B.

How large is Brown Advisory's 13F portfolio?

Brown Advisory's canonical 13F AUM in the research brief is $71.68B, with summed disclosed holdings of $70.51B and 500 consolidated current positions in the article data set.

Is Brown Advisory a passive index filer?

Brown Advisory should not be described as a passive index filer. Its platform profile is an active investment management and strategic advisory firm, and the platform data has filerType null rather than a passive classification.

Why does the article say Q1 2026 if the report date is 2025Q4?

The SEC filing event occurred in Q1 2026, with Form 13F-HR filed 2026-02-13 under accession 0001345929-26-000018. The disclosed holdings use the 2025Q4 report date of 2025-12-31.