IBB Top Holdings & Constituents
IBB, offered by iShares, holds 254 reported positions across $9.2B in assets. Its largest holdings are BlackRock Funds III (13.18%), Vertex Pharmaceuticals, Inc. (VRTX) (7.66%), and Gilead Sciences, Inc. (GILD) (7.52%). The 5 biggest positions account for 41.57% of reported assets. The table below lists every reported holding with its portfolio weight and market value in US dollars — open any constituent to research its own performance.
| Position | Weight | Market Value |
|---|---|---|
— BlackRock Funds III | 13.18% | $783.12M |
VRTX Vertex Pharmaceuticals, Inc. | 7.66% | $455.33M |
GILD Gilead Sciences, Inc. | 7.52% | $446.54M |
AMGN Amgen, Inc. | 7.50% | $445.79M |
REGN Regeneron Pharmaceuticals, Inc. | 5.70% | $338.58M |
Holdings data comes from the latest SEC Form N-PORT-P filing for this fund, covering the reporting period ended Sep 30, 2025. Market values are reported in US dollars, and each weight represents the position's share of reported fund assets. Cash, derivatives, and rounding can mean displayed weights do not total 100%. Funds rebalance and file on a schedule, so this page may not reflect intraday or post-filing changes.