NEW YORK (Reuters) — Tyco International Ltd. is about to get a whole lot smaller.With its planned breakup into three publicly-traded companies a few weeks away, investors are trying to figure out how to value the conglomerate.

Some large shareholders are buying Tyco ahead of the breakup, but their view contrasts with that of Wall Street analysts, some of whom think the stock is already overvalued.

Among 13 analysts who cover Tyco shares, eight rate it a “hold”, while four have a “buy” or “outperform” rating, according to Reuters Estimates. One — Prudential Equity Group’s Nicholas Heymann — has an ‘underperform’ rating.

Heymann’s sum-of-the-parts analysis values Tyco at about $27, below its Monday price of $31.70. The stock has been trading between $30 and $33 for nearly four months.

The need for new spending and higher tax rates will depress earnings and free cash flow, Heymann said in a February research note.

Tyco expects the tax-free spinoff to be completed early in the second quarter.

Shareholders will receive shares in Tyco Electronics and Tyco Healthcare, with the number of shares determined by Tyco’s board when it declares the dividend.