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Nama : MahmudahProgram Studi : Magister ManajemenJudul : Manipulasi Harga Penutupan di Bursa Efek IndonesiaPenelitian ini bertujuan untuk mengetahui manipulasi harga penutupan di Bursa Efek Indonesia dengan data sampel periode September 2016 hingga Februari 2017. Dari dua puluh saham dengan kapitalisasi pasar terbesar, ditemukan delapan saham yang terindikasi mengalami manipulasi harga penutupan. Penelitian ini dilengkapi dengan wawancara dealer, fundamental perusahaan, peristiwa internal dan eksternal yang mempengaruhi imbal hasil dan price reversal. Ditemukan 31 keterbukaan informasi yang dilaporkan setelah jam perdagangan memiliki efek price reversal pada keesokan pagi. Terdapat pergeseran volume transaksi yang signifikan ke sesi pre-closing, mengindikasikan pentingnya nilai ekonomi pada sesi penutupan, dan peningkatan volatilitas yang menunjukkan bahwa harga penutupan bersifat sementara.Kata kunci:Manipulasi harga penutupan, keterbukaan informasi, pre-closing, price reversal, volatilitas, volume transaksi.

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ABSTRACT
Name MahmudahStudy Program Master of ManagementTittle Closing Price Manipulation in Indonesia Stock ExchangeThis study examined closing price manipulation in Indonesia Stock Exchange. We use the data sample during September 2016 to February 2017. From twenty biggest market capitalizations, there are eight stocks that were indicated having closing price manipulation. This study also featured deep interview with equity dealers, fundamental, internal external events and found that 31 of information disclosures reported to IDX after market close has effect on price reversal. There is significant proportion of volume shifts to pre closing indicates the economic importance of the last minutes of trading, and the heightened volatility suggests that closing price contains transitory component.Keywords Closing price manipulation, information disclosure, pre closing, price reversal, transaction volume, volatility.

Abstrak :
The Indonesia Stock Exchange has really concerned about improving stock market quality these days. One of its effort is implementing pre-closing trading session. It refers to Decision of the Board of Directors of The Indonesia Stock Exchange Number Kep-00399/BEI/11-2012, regarding Amendment to Rule Number II-A concerning Equity-Type Securities Trading. The rule is effective on 2nd January 2013 and Indonesia Stock Exchange has implemented it since that date. The purposes of pre-closing implementation are to mitigate marking the close, which is the practice of buying security at the very end of the trading day at a significantly higher price than the current price of the security, and to improve market quality. This paper attempts to veryfy whether the impact of pre-closing implementation to price efficiency is positive or not. The result shows that the pre-closing implementation has positive impact to price efficiency. It reduces the return volatility and market manipulation at the closing time which also means that the pre-closing implementation has effectively improved market quality in the Indonesia Stock Exchange.

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ABSTRAK
Penelitian ini bertujuan untuk menganalisis pengaruh sentimen investor terhadap return saham, pembentukan harga saham, dan required rate of return. Penelitian ini menggunakan analisis kuantitatif dengan pemilihan sampel seluruh perusahaan non-finansial yang terdaftar di Bursa Efek Indonesia dalam periode 2011 ndash; 2015. Hasil penelitian membuktikan bahwa sentimen investor berpengaruh negatif terhadap return saham bulan Januari dan berpengaruh positif terhadap return saham rata-rata bulanan 6 bulan. Hasil penelitian juga membuktikan terdapat moderasi sentimen yang bersifat pure moderator sebagai tambahan dari pengaruh informasi akuntansi pada pembentukan harga saham. Terdapat moderasi pada high sentiment terhadap required rate of return dengan hubungan negatif terhadap required rate of return.

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This study aims to analyze the effect of investor rsquo s sentiment on the stock return, stock price, and required rate of return. This study uses quantitative analysis to the whole sample selection of non financial companies listed on the Indonesia Stock Exchange in the period of 2011 2015. This research finds that investor rsquo s sentiment has negative effect on January stock returns and positive effect on stock returns monthly average of 6 month. The result also finds that there is moderation on sentiment as an additional effect of accounting information to stock prices, and there is moderation in the high sentiment against the required rate of return with negative correlation to the required rate of return.

Abstrak :
Penelitian bertujuan untuk membentuk portofolio optimal dari dua buah model pembentukan portofolio optimal, yakni Markowitz Model (1952) dan Single Index Model (1959) dari saham-saham yang tergabung di dalam Indeks Kompas 100 periode 2008-2013. Lebih lanjut, hasil kedua portofolio yang telah dibentuk disandingkan untuk dilihat lebih jauh portofolio mana yang lebih baik. Hasil penelitian menunjukkan bahwa portofolio optimal yang dibentuk berdasarkan Single Index Model mampu memberikan tingkat pengembalian yang lebih baik disertai dengan kinerja portofolio yang juga lebih baik daripada portofolio yang dibentuk berdasarkan Markowitz Model.

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The study aimed to construct optimal portfolios using two different methods, Markowitz Model (1952) and Single Index Model (1959) from Indeks Kompas 100 stock in Indonesia Stock Exchange. This study took data from January 2008 - October 2013. Further, this study put both portfolio together to be analyzed which portfolio construction model is better. The results showed that both portfolio give a higher return than risk-free rate does. The results also showed that return and performance of Single Index Model is outperform Markowitz Model's.