Open Offer
An open offer is a mandatory or voluntary public announcement by an acquirer to purchase at least 26% of the total shares of a target listed company from its public shareholders at a specified price, triggered by SEBI's Takeover Code.
Under SEBI (Substantial Acquisition of Shares and Takeovers) Regulations 2011, any acquisition that results in the acquirer holding 25% or more of the voting rights in a listed company triggers a mandatory open offer. The open offer must be made to acquire a minimum of 26% of the total shares from public shareholders at a price not lower than the prescribed formula — typically the highest of the volume-weighted average price over preceding periods, the negotiated price paid in the triggering transaction, and other benchmarks.
Open offers are a critical investor protection mechanism in India. They ensure that when a controlling stake changes hands — through a block deal, preferential allotment, or other mode — minority shareholders get a fair exit opportunity at a price comparable to what the acquirer paid the existing promoter. Without this regulation, promoters could be bought out at a premium while small investors continued holding at lower market prices.
The Ambuja Cements–ACC–Adani takeover from Holcim in 2022 was one of India's largest takeover transactions in recent years, requiring substantial open offer obligations under SEBI regulations. As Adani Group acquired Holcim's stakes in both Ambuja Cements and ACC, it was obligated to make open offers to public shareholders of both companies. The open offer prices and subsequent share price movements were widely tracked by investors in both companies.
For retail investors, an open offer provides an attractive exit route, especially if the offer price is at a premium to the current market price. However, investors must carefully read the offer documents — the Letter of Offer filed with SEBI and stock exchanges — to understand any conditions to completion (regulatory approvals, minimum acceptance conditions) and the timeline for payment. Shares tendered into an open offer are blocked in the investor's demat account during the tendering window.
Voluntary open offers — where an acquirer proactively increases its stake beyond what regulatory thresholds require — are less common but can signal acquirer confidence in the target. The price and strategy behind voluntary open offers warrant scrutiny to understand the acquirer's long-term intentions toward the company and its minority shareholders.