{"index": {"name": "Building Materials", "level": "industry", "country_code": "CN", "sector": "Basic Materials", "industry": "Building Materials", "constituent_count": 39, "latest": {"week_ending": "2026-05-29", "index_value": 1172.18871586, "weekly_return": -3.28068969, "constituents": 39, "advancing": 8, "declining": 31, "unchanged": 0, "trend_line": 1212.742479, "activity_lines": {"activity_5": 1202.425312, "activity_10": 1203.57193, "activity_20": 1215.432421, "activity_30": 1216.036886}, "fair_value": 1009.667929, "trend_signal": 0}, "summary": "For the week ending 29 May 2026, Building Materials declined 3.28% with 8 advancing, 31 declining, and 0 unchanged constituents.", "links": {"chart": "https://sharemaestro.com/structure/cn/basic-materials/building-materials/", "api": "https://sharemaestro.com/api/structure/cn/basic-materials/building-materials/", "share_image": "https://sharemaestro.com/structure/cn/basic-materials/building-materials/share-image.svg"}}, "available": true, 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