請問stock, share, equity的分別.

Stock 是股票（證劵）的統稱。
I own stocks. （我擁有股票）
I have ten stocks in my portfolio. （我的投資組合內有十隻股票）
Microsoft's stock hits a recent high. （微軟的股票達到近來的高位）

Share 是一股股票，每一股有一個投票權
I own a share of Microsoft. （我擁有一股微軟）
I own two hundred shares of Microsoft. （我有二百股微軟）
I own two hundred shares of Microsoft's stock. （我有二百股微軟的股票）
Some stocks are divided into A, B, and C shares. （有些股票分為A/B/C股）

Equity 是資產
The president owns 50% of the shares. The president has a large equity in the company.

照字面解佢地都叫股票,
如果用英文寫: 我買了匯豐銀行的股票 I bought the stock of HSBC Bank

用法:
股票 Stock - Shares of stock (股份) ,Stock Market (股票市場)
股份 shares - per share (每股)
證券 Secuities - 證券是用來證明持有人享有的某種特定權益的憑證
權益 Equity - Shareholders equity: 股東在公司(資產凈值)權利

Stock 亦可解作存貨

請問stock, share, equity的分別.
You are right, but there are some minor difference between them:
1/ Stock - this is the right word for 股票
2/ Share - this is mainly indicates the quantity of your stock owned. 股份
3/ Equity - this is general named by some appointed company stock shares, and is not commonly used in stock exchange market. 公司股

Stock:(n)1.supply 2.finance 3.farm animals 4. family/ancestors 5.food 6. for punishment
7. respect 8. plant 9. theatre
(v) / (adj)
later tell u more