Maintaining its bullish trend for the second week in a row, the Qatar Stock Exchange (QSE) index gained 412.93 points, or 3.25 percent, during the week to close at 13,122.05 points. The bull run saw QSE investors gain almost QR17 billion this week as market capitalisation increased by 2.4 percent to QR722.1 billion compared with QR705.3 at the end of the previous trading week.Gains were mainly led by foreign institutions that remained bullish to close the week with net buying of QR93.6 million against net buying of QR117.8 million in the previous week. Foreign retail investors, however, closed the week with a net selling of QR26 million against net selling of QR20.7 million in the previous week. According to an estimate by QNB Financial Services (QNBFS), foreign institutions were net buyers of Qatari stocks worth $3.58 billion since the start of this financial year.Qatari institutions, which remained bullish with a net buying of QR93.4 million against a net buying of QR5 million in the week before, also played a vital role in lifting the QSE index higher for the week.Qatari retail investors, however, remained bearish with a net selling of QR161.1 million against net selling of QR102.1 million the week before. The traded value during the week rose 15.3 percent to QR2,618.4 million from QR2,271.6 million in the previous trading week. Baladna was the top value traded stock during the week with a total traded value of QR310.4 million.Traded volume climbed 22.4 percent to 901.7 million shares against 736.7 million shares in the previous trading week. Baladna was the top volume traded stock during the week with a total traded volume of 178.3 million shares.The number of transactions also increased 18.2 percent to 87,659 against 74,179 in the previous week. Masraf Al Rayan, Industries Qatar (IQ) and Qatar Islamic Bank (QIB) were the primary contributors to the weekly index gain. Masraf Al Rayan and IQ added 126.66 points and 103.78 points to the index, respectively. QIB added another 58.25 points to the index.Mannai Corporation was the best performing stock for the week rising 17 percent. On the other hand, QNB lost 1.5 percent to decline the most during the week.The week saw all the seven sector indices close in the positive territory. The telecom sector, which gained 4.93 percent, was the best performing sector index for the week.The industrial sector, which gained 4.29 percent, was the second best performing stock for the week. The banking and financial services sector, which gained more than 2 percent, was instrumental in lifting the main index higher for the second week in a row.Of the 46 traded companies traded during the week, as many as 34 closed the week higher, while the rest of the eight stocks closed lower.