Since 1980s, the ongoing increase in global capital movements has led to the rise of emerging markets (EMs). Large external financing needs and risk premiums of EMs took the attention of international investors. EMs with high growth rates compared to the world average, are also attracting these markets in terms of international investors. Global capital movements are in the form of foreign direct investment and portfolio investments. Turkey stock market is one of the mostly affected EMs from the liquidity in international capital markets. Numerous variables affecting the global economy, such as monetary policy decisions made by the Federal Reserve (FED) and the European Central Bank (ECB), and country-specific variables such as exchange rate, interest rate, economic growth simultaneously affect capital flows as portfolio investments to the stock markets. Tax legislation, trust in law and justice, political stability of the country are some other important factors as the variety of financial instruments, transaction volume and market depth. There is a wide literature investigating the factors effecting international portfolio investments tend towards EMs. In particular, exchange rate, interest rate and asset turnover are the primary factors for portfolio investments which aim to gain high returns. Credit default swap’s (CDS) premiums, are major country risk indicators for those investing in different capital markets and are followed by the international portfolio investor. In the study which analyzes the international net portfolio investments to Turkey stock market in the context of the relationship with USD/TRY exchange rate, equity market index and Turkey’s 5 years credit default swap’s (CDS) premiums’, the weekly observations used beginning from 2013 to 2016. Because the data of the weekly net portfolio investments to the stock market have negative values in the sample period, all other time series used in the study are weekly changes too. By Multivariate Markov Switching Vector Autoregressive Models (MMS-VAR), the relationships analyzed in a nonlinear perspective. Use of MMS-VAR models presents the relationship according to the different regimes of the markets in the study. In the Markov Regime Switching (MRS) model, the regime of the economy is described by a state variable with probabilities and durations. Switching between different regimes of the economy is in a Markov chain process. The model that best describes the relationship between variables in this study is the three regimes (recession, moderate growth and expansion) Markov switching intercept and heteroscedasticity model (MSIH(3)-VAR(2)) model. The MSIH model has proven to be strong in explaining financial time series. The recession and expansion regimes in the model may also be expressed as bear (recession) market and bullish (expansion) market in financial markets. Firstly, MSIH(3)-VAR(2) model indicate that the variables used in the study governed by a long run relationship, and volatility is important in modelling this relationship. Secondly, the coefficients in the model presents negative relationships between net portfolio flows and two variables (exchange rate and CDS premiums) in long term. While exchange rate or CDS premiums increase (decrease), net portfolio flows decrease (increase). Conversely, net portfolio flows and stock index move in the same direction. While the transition probabilities examined, the maximum probabilities are seen from switching any regime to regime 2 (moderate growth). Another attracting result is that the transition from regime 1 (recession regime) to regime 3 (expansion regime) has the lowest probability of 0,1%. Moreover, the highest number of observations and the longest duration are in regime 2 in the sample period. In the MMS-VAR model, the response of the variables to a standard deviation shock made to other variables can be monitored separately for each regime. One of the important empirical findings of the study seen by impulse-response analyzes. In the short term, the relationship between net portfolio investments and exchange rate vary whether it is in the recession regime or in the growth regime. The strongest effect is shown in the third regime in the negative direction. Lastly, the direction of responds of net portfolio flows do not vary according to the regimes for the changes in stock index or CDS premium. If one standard deviation’s shock is applied to the index, the respond of net portfolio flows is positive in all three regimes as increase in three weeks and becoming permanent at the end of the third week. The responses of net portfolio flows to CDS premiums are seen as decrease in three weeks and become permanent at the end of the third week. Owing to the results are obtained in accordance with anticipated expectations of the study and the market dynamics, t