The next morning, the story was much the same: margin calls were made for about $2.1 billion more.
The first margin call had come on November 14, 1969.
A person close to the family said they were prepared to cover a margin call if it happened.
Many more have had to sell stocks to meet margin calls.
Some other shares have been sold to meet margin calls.
When the stock market started to contract, many individuals received margin calls.
Late in the afternoon, a third margin call went out - for $669.5 million from 15 firms.
They have to sell other things to meet margin calls.
A trader, of course, can set it above that, if he does not want to be subject to margin calls.
To meet the margin call, he pledged 25 million shares of his own company's stock.