Managers of Life Partners Holdings Inc. are not sure why the price of the company’s common stock is going up and down so much this week.

Brian Pardo, chief executive of Life Partners, Waco, Texas, a publicly traded life settlement company, today issued a statement discussing the price swings.

The price of the stock has ranged between $4 and $13 throughout most of the year, then climbed to almost $19, from $12.35, in the past 30 days.

The price closed Friday at $18.86, but it plunged more than $2, to $16.50, Monday morning.

The price fell again Tuesday, then opened today at $16.21 and closed at $17.15.

Average daily volume has increased substantially over the past 3 months, and that’s a sign that the market recognizes that Life Partners has made substantial progress over the past year, Pardo says in his statement.

“While there may have been some profit-taking yesterday, we feel the increase in our market capitalization is due to the outstanding increases in our net income and other key financial results which we have previously announced,” Pardo says.

“In response to recent inquiries from shareholders, the company is unaware of any reason for yesterday’s decline in price and we expect our results of operations to remain in line with our previous announcement and analyst’s predictions,” Pardo says.

Members of the public participating in a Yahoo! Life Partners stock message board pointed out that the company has benefited from being the only public company specializing in the life settlement market but may have suffered this week from investor concerns about the fact that the company’s price-to-earnings ratio has climbed over 98.