Core Viewpoint - The China Oil and Gas Resource Index has shown mixed performance, with a recent decline despite a monthly increase, indicating volatility in the oil and gas sector [2]. Group 1: Index Performance - The China Oil and Gas Resource Index decreased by 0.52% to 736.04 points, with a trading volume of 11.226 billion yuan [1]. - Over the past month, the index has increased by 6.59%, but it has decreased by 3.91% over the last three months and by 6.98% year-to-date [2]. Group 2: Index Composition - The index includes companies involved in oil and gas exploration, services, equipment manufacturing, refining, processing, transportation, and sales [2]. - The top ten weighted companies in the index are: China National Petroleum (10.47%), China National Offshore Oil (10.06%), Sinopec (9.64%), Guanghui Energy (6.62%), and others [2]. - The sector composition of the index shows that energy accounts for 75.48%, industrials for 18.72%, financials for 2.34%, materials for 1.59%, consumer discretionary for 1.06%, and utilities for 0.81% [2]. Group 3: Index Adjustment and Management - The index samples are adjusted biannually, with adjustments occurring on the next trading day after the second Friday of June and December [3]. - Weight factors are generally fixed until the next scheduled adjustment, with special circumstances allowing for temporary adjustments [3]. - Public funds tracking the oil and gas resources include Huatai-PineBridge China Oil and Gas Resource ETF, Bosera China Oil and Gas Resource ETF, and Yinhua China Oil and Gas Resource ETF [3].