The Company funds pension liabilities by payments to insurance companies and a managed fund.
The Post's pension liabilities may be about $20 million.
The government said it would put the rest of the shares into a fund to cover pension liabilities.
The possible increase in unfunded pension liability was disclosed after the stock market closed today.
The agency earlier this week gave the $2 billion pension liability back to the big steelmaker.
As a result, a number of these companies will need to increase the pension liabilities on their books.
Invensys also has a £931 million ($1.5 billion) pension liability.
Verizon also has enough money to cover its $4 billion pension liability.
It is also shedding nearly $18 billion in health care and pension liabilities.
Many companies will undoubtedly decide to allow a pension liability to grow and deal with it later.