Berkshire's Apple stake has plunged in value from $161 billion to $129 billion, reflecting a wider market slump and worries about iPhone demand.
### Instruction: What is the sentiment of this news? Please choose an answer from {negative/neutral/positive}
### Input: Berkshire's Apple stake has plunged in value from $161 billion to $129 billion, reflecting a wider market slump and worries about iPhone demand.
### Response: moderately negative