BLAIR WILLIAM & CO/IL
Institutional investor · Portfolio as of Q3 2025
Top Holdings1,844 positions
Stock | Shares | Value | Weight | Avg Buy | Est. P&L | Held | Conviction |
|---|---|---|---|---|---|---|---|
MICROSOFT CORP | 3.6M | $1.9B | 5.0% | $123.66 | +315.36% | 28 qtrssince 2018-Q4 | Decreased 0 |
APPLE INC | 6M | $1.5B | 4.1% | $103.22 | +145.79% | 28 qtrssince 2018-Q4 | Decreased 0 |
AMAZON.COM INC | 6M | $1.3B | 3.5% | $113.46 | +95.82% | 28 qtrssince 2018-Q4 | Decreased 0 |
NVIDIA CORP | 5.6M | $1.1B | 2.8% | $118.12 | +53.95% | 28 qtrssince 2018-Q4 | Increased 55 |
ALPHABET INC-CL C | 3.1M | $766.2M | 2.0% | $95.36 | +156.08% | 28 qtrssince 2018-Q4 | Decreased 0 |
JPMORGAN CHASE & CO | 2.3M | $727.7M | 1.9% | $105.52 | +196.39% | 28 qtrssince 2018-Q4 | Decreased 0 |
VISA INC-CLASS A SHARES | 2M | $669.8M | 1.8% | $133.30 | +154.06% | 28 qtrssince 2018-Q4 | Decreased 0 |
IDEXX LABORATORIES INC | 1M | $659.2M | 1.8% | $189.63 | +232.51% | 28 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL A | 2.5M | $614.1M | 1.6% | $101.51 | +140.26% | 28 qtrssince 2018-Q4 | Increased 49 |
STATE STREET SPDR S&P 500 ETF TRUST CL USD INC | 859,344 | $572.5M | 1.5% | $325.26 | +103.44% | 28 qtrssince 2018-Q4 | Decreased 0 |
MASTERCARD INC - A | 976,597 | $555.5M | 1.5% | $200.68 | +182.31% | 28 qtrssince 2018-Q4 | Decreased 0 |
COSTCO WHOLESALE CORP | 551,558 | $510.5M | 1.4% | $313.56 | +193.48% | 28 qtrssince 2018-Q4 | Decreased 0 |
META PLATFORMS INC-CLASS A | 678,857 | $498.5M | 1.3% | $439.62 | +68.96% | 28 qtrssince 2018-Q4 | Increased 58 |
UBER TECHNOLOGIES INC | 4.2M | $416.1M | 1.1% | $51.69 | +92.63% | 26 qtrssince 2019-Q2 | Decreased 0 |
GE VERNOVA LLC | 628,121 | $386.2M | 1.0% | $389.31 | +54.57% | 6 qtrssince 2024-Q2 | Decreased 0 |
VEEVA SYSTEMS INC-CLASS A | 1.3M | $384.1M | 1.0% | $99.11 | +195.64% | 28 qtrssince 2018-Q4 | Increased 49 |
SERVICENOW INC | 399,081 | $367.3M | 1.0% | $106.24 | +77.11% | 28 qtrssince 2018-Q4 | Increased 53 |
PROGRESSIVE CORP | 1.4M | $355.4M | 0.9% | $90.99 | +152.45% | 28 qtrssince 2018-Q4 | Decreased 0 |
FASTENAL CO | 7M | $341.6M | 0.9% | $27.84 | +72.40% | 28 qtrssince 2018-Q4 | Increased 45 |
AMPHENOL CORP-CL A | 2.8M | $340.5M | 0.9% | $46.48 | +159.84% | 28 qtrssince 2018-Q4 | Decreased 0 |
BLAIR WILLIAM & CO/IL manages $37.6B across 1844 positions as of Q3 2025. Top holdings: MSFT (5.0%), AAPL (4.1%), AMZN (3.5%). Fund DNA: Balanced Allocator. HoldingsIntel Rating: 5/5.0.
Active quarter - 100 new positions, 80 exits, 695 increased. Top move: META (INCREASED, conviction 58). Portfolio: $37.6B across 1844 positions.
Top holdings by portfolio weight
Portfolio allocation by GICS sector
Behavioral investing profile
Position Outcomes
Best and worst performing positions by estimated return
Top Winners
Top Losers
Cost basis estimates based on full filing history using quarter-end prices. Actual transaction prices are not disclosed in 13F filings.
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Data sourced from SEC EDGAR 13F filings. Not financial advice. Full disclaimer