Minimum promoters' contribution rule: promoters must secure prescribed post-issue capital contribution, with escrow and conversion safeguards. Promoters must hold a prescribed minimum of post-issue capital, subject to limited exceptions allowing specified institutional or certain non-individual investors or promoter-group entities to cover shortfalls without being identified as promoters. Contribution may be by equity or subscription to convertible securities (with written undertaking where conversion price is undisclosed); contributions relating to convertible securities convertible on different dates must not be priced below the weighted average conversion price. Promoters must satisfy the requirement before issue opening, keep contribution amounts in escrow until issue proceeds are released, and disclose any prior use of such funds; post-issue calculations assume full conversion and exercise of vested options.