The escalating Russia-Ukraine crisis and the weakened oil prices had their cascading effect on the Qatar Stock Exchange, whose key barometer tanked 344 points and capitalisation eroded QR13bn this week.The telecom, banking and industrials counters witnessed higher than average selling pressure as the 20-stock Qatar Index knocked off 2.74% from its 20-stock Qatar Index this week which saw Commercial Bank and Ooredoo migrate to large cap in the MSCI Qatar Index.More than 72% of the traded constituents in the main market were in the red this week which saw the rating agencies Standard and Poor’s as well as Moody’s upgrade Industries Qatar’s rating outlook to “positive” from “stable”.The foreign institutions’ net buying was seen weakening considerably this week which saw Lesha Bank co-invest in Ekaterra, the world-renowned tea business.The domestic institutions continued to be net sellers but with lesser intensity this week which saw Qatar’s food inflation was seen ebbing month-on-month this October.The Gulf institutions’ net profit booking also declined in the market this week which saw Al Faleh Educational Holding seeking further accreditation for its Doha Academy and plan to introduce new degree programmes at AFG College as part of cementing its position in Qatar's academic trajectory and strengthen its topline.The Islamic index was seen declining slower than the other indices this week which saw Qatar, like other host countries for the previous versions of the World Cup, expected to give attractive double-digit returns to investors during the three-year window leading to the august soccer tournament.The local retail investors were seen bullish this week which saw a total of 0.53mn Masraf Al Rayan-sponsored exchange traded fund QATR worth QR1.45mn trade across 35 deals.Trade turnover and volumes were on the decline in the main and venture markets this week, which saw as many as 0.08mn Doha Bank-sponsored QETF valued at QR1mn change hands across 66 transactions.Market capitalisation was seen weakening QR12.58bn or 1.8% to QR678.6bn on the back of large and midcap segments this week which saw the industrials and banking sectors together constitute more than 62% of the total trade volume in the main market.The Total Return Index plummeted 2.74%, All Share Index by 2.83% and All Islamic Index by 2.29% this week, which saw no trading of sovereign bonds.The telecom sector plunged 4.56%, banks and financial services (3.3%), industrials (3.15%), real estate (2.58%), consumer goods and services (1.14%) and insurance (0.42%); while transport gained 0.11% this week, which saw no trading of treasury bills.Major losers in the main market included Qatar Electricity and Water, Qatari German Medical Devices, Qatar Cinema and Film Distribution, Dlala, Al Khaleej Takaful, QNB, QIIB, Alijarah Holding, Salam International Investment, Mannai Corporation, Industries Qatar, Aamal Company, Gulf International Services, Mazaya Qatar, Ezdan and Ooredoo. In the venture market, Mekdam Holding saw its shares depreciate in value this week.Nevertheless, Qatar General Insurance and Reinsurance, QLM, Doha Bank, Estithmar Holding, Gulf Warehousing and Qatar Industrial Manufacturing were among the gainers in the main market. In the junior bourse, Al Faleh Educational Holding saw its shares appreciate in value this week.The foreign funds’ net buying decreased considerably to QR4.84mn compared to QR390.6mn the week ended November 11.However, the Qatari individuals turned net buyers to the tune of QR21.82mn against net sellers of QR87.02mn the previous week.The Arab individuals’ net buying strengthened substantially to QR18.33mn compared to QR7.86mn a week ago.The foreign individuals were net buyers to the extent of QR15.38mn against net sellers of QR33.33mn the week ended November 11.The Gulf retail investors turned net buyers to the tune of QR2.44mn compared with net sellers of QR8.45mn the previous week.The Arab institutions were net buyers to the extent of QR0.78mn against net profit takers of QR0.27mn a week ago.The domestic funds’ net selling shrank significantly to QR12.12mn compared to QR210.21mn the week ended November 11.The Gulf institutions’ net profit booking eased perceptibly to QR51.46mn against QR59.2mn the previous week.Total trade volume in the main market was down 8% to 523.47mn shares, value by 7% to QR2.08bn and deals by 11% to 72,079.The venture market saw a 33% contraction in trade volumes to 0.79mn equities, 33% in value to QR6.09mn and 25% in transactions to 371.