{"index": {"name": "Building Materials", "level": "industry", "country_code": "HK", "sector": "Basic Materials", "industry": "Building Materials", "constituent_count": 27, "latest": {"week_ending": "2026-05-29", "index_value": 900.8094293, "weekly_return": -2.51085996, "constituents": 27, "advancing": 8, "declining": 16, "unchanged": 3, "trend_line": 970.867125, "activity_lines": {"activity_5": 923.267804, "activity_10": 933.069251, "activity_20": 957.368257, "activity_30": 966.561168}, "fair_value": 767.409653, "trend_signal": 0}, "summary": "For the week ending 29 May 2026, Building Materials declined 2.51% with 8 advancing, 16 declining, and 3 unchanged constituents.", "links": {"chart": "https://sharemaestro.com/structure/hk/basic-materials/building-materials/", "api": "https://sharemaestro.com/api/structure/hk/basic-materials/building-materials/", "share_image": "https://sharemaestro.com/structure/hk/basic-materials/building-materials/share-image.svg"}}, "available": true, 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