We analyse controlling owners incentive to provide non-controlling owners with better protection against self-dealing through offering new shares with tag-along rights, - the private contracting alternative to equal price provision in takeover legislation. Our model identifies two counteracting effects: The benefit of offering tag-along rights is the anti-expropriation effect which makes it harder for new owners to finance a takeover through expropriation of minority owners. The cost is the rent transfer effect which implies that there is a wealth transfer from controlling owners to existing minority owners. Empirically we test the implications of the model using data on equity offerings in Brazil. Consistent with the theoretical predictions we find that offering tag-along rights increases market value of a firm and that companies offering shares with tag-along rights offer larger claims, have less disproportional ownership structure, have a smaller group of existing minority shareholders and are more likely to issue new shares. The paper, thus, find strong support for private contracting being an important alternative governance mechanism to legal protection of investors.