U.S. President Barack Obama, a fierce advocate for gun regulation, is an unlikely investor in the firearms industry ¡ª yet he has money in a pension fund that holds stock in gun and ammunition companies.

Although Obama¡¯s stake is minuscule, worth no more than $30, it reflects a much larger surge of investment.

The president is among millions of Americans investing in gun companies ¡ª often unwittingly ¡ª as mutual funds have increased such holdings to record levels, according to a Reuters analysis of institutional investment in firearms companies.