{"index": {"name": "Oil & Gas E&P", "level": "industry", "country_code": "HK", "sector": "Energy", "industry": "Oil & Gas E&P", "constituent_count": 6, "latest": {"week_ending": "2026-05-29", "index_value": 262.32017736, "weekly_return": -4.7223101, "constituents": 6, "advancing": 1, "declining": 5, "unchanged": 0, "trend_line": 296.776207, "activity_lines": {"activity_5": 270.224546, "activity_10": 280.86936, "activity_20": 300.214678, "activity_30": 299.688986}, "fair_value": 346.744114, "trend_signal": 0}, "summary": "For the week ending 29 May 2026, Oil & Gas E&P declined 4.72% with 1 advancing, 5 declining, and 0 unchanged constituents.", "links": {"chart": "https://sharemaestro.com/structure/hk/energy/oil-gas-ep/", "api": "https://sharemaestro.com/api/structure/hk/energy/oil-gas-ep/", "share_image": "https://sharemaestro.com/structure/hk/energy/oil-gas-ep/share-image.svg"}}, "available": true, "methodology": {"country_code": "HK", "asset_type": "equity", "exchange_scope": 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