The bitcoin network is not a dependent of stock market but whenever there's bullrun like this, other stock market tends to increases as well but not a must, while other cryptocurrencies also increases as well during this period and at the same time, it's such a period that needs total attention and carefulness because the bitcoin use to be very high in volatility which means within a couple of times anything can change that it goes dip or high.
In my opinion, that's the reality but, if there is negative sentiment related to world financial issues it seems that market price movements also have an effect, for example on the stock market and BTC as well. the reason i am an investor is not only to invest in BTC, they also spread it in stocks and more because it is a world of finance and it is intertwined even though the percentages vary.