Prior approval from the Central Bank is required for the repatriation of sales proceeds of non-residents equity investment in public and private limited companies that are not listed with the stock exchange companies, when the amount of proceeds to be remitted exceeds Tk. 100 million or equivalent in foreign currency (about USD 1 million as of June 2023) based on fair value determined in accordance with the relevant regulation. Repatriation of sale proceeds below Tk.10 million or equivalent in foerign currency do not require prior approval by the Bangladesh Bank nor a valuation report from independent valuer as is the case for repatriation of higher amounts. Prior approval applies only to the liquidation of direct investment. Post-tax dividends and capital gains from sale proceeds of listed shares are credited to their 'nonresident investor taka accounts' (NITA) and the balance lying in NITA are freely remittable abroad.
"Chapter 9, Section I. FOREIGN INVESTMENT IN BANGLADESH [...]
Article 3. Remittance of sales proceeds of non-residents' investment (direct/portfolio) in Bangladesh
Guidelines for effecting remittance of sales proceeds of non-residents' investment in Bangladesh are as under: [...]
(B). Shares of the public limited companies not listed with stock exchange and private limited companies Prior approval of Bangladesh bank is required for repatriation of sales proceeds of non-residents equity investment in the: 
(1) public limited companies that are not listed with the stock exchange companies; and (2) private limited companies. There being no established market price for such investment, Bangladesh Bank will accept fair value of the shares as on the date of sale based on appropriate combination of three valuation approaches (viz. net asset value approach, market value approach and discounted cash flow approach) depending on the nature of the company. Application for repatriation of sale proceeds of shares shall be submitted to FEID at head office of Bangladesh Bank with a Valuation Certificate of shares issued by a Merchant banker licensed by BSEC or a Chartered Accountant experienced in company valuation. Appendix-6/3 of this Guidelines provides indicative guidelines for arriving at fair value. The valuation certificates by eligible valuers will have to be supported by full explanation justifying the fair value arrived at. Full set of audited financial statements of the company will have to be submitted to Bangladesh Bank along with application for remittance approval. If not fully satisfied about appropriateness of the valuation arrived at, Bangladesh Bank reserves the right to obtain second opinion from another qualified valuer of its choice.
If calculated fair value (accepted by Bangladesh Bank) exceeds the face value of the share of the company concerned, capital gain derived therefrom may also be repatriated. However, only accepted fair value shall be considered as repatriable/or for re-investment in Bangladesh.[...]" (GUIDELINES on Bangladesh Bank Foreign Exchange (Volume I) of 2018)
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"Please refer to Paragraph 3(B), Chapter 9 of the Guidelines for Foreign Exchange
Transactions- 2018 (GFET) Volume 1 on the captioned subject.
02. Paragraph 3(B), Chapter 9 of GFET stated that the sale proceeds of nonresident equity investment in public limited companies not listed with the stock exchanges and private limited companies are repatriable abroad with prior Bangladesh Bank approval as on the date of share sales, based on latest audited financial statements. 
[...]
03. To bring rationalization and simplicity in valuation process, it has been decided that-
(a) In case of transfer of shares from non-resident to resident in public limited companies not listed with the stock exchanges and private limited companies, the Memorandum of Understanding (MoU) for share sale-purchase agreement between buyer and seller needs to be concluded on receipt of approval from Bangladesh Bank regarding determination of the fair value of shares. Bangladesh Bank will accept the fair value of the shares as repatriable abroad /or for re-investment in Bangladesh determined as on the date of MoU for share sale-purchase agreement based on the latest audited financial statements of the target company. The fair value of the shares shall be determined by weighted average calculation of all the 3 (three) valuation approaches (viz. net asset value approach, market value approach and discounted cash flow approach) or on any of the suitable approaches depending on the nature of the company, having justified ground.
The MoU shall be executed at the fair value approved by Bangladesh Bank, subject to observance of the following instructions-
(i) Permission requests for transfer of shares and repatriation of sale proceeds of shares shall be submitted to the Foreign Exchange Investment Department, Bangladesh Bank, Head Office, Dhaka with a Valuation report issued by a Merchant Banker licensed by Bangladesh Securities and Exchange Commission (BSEC) or a Chartered Accountant experienced in company valuation and listed by Bangladesh Bank and/or BSEC for auditing banks, financial institutions and listed companies; 
(ii) Professional valuation report is not mandatory if the applied value for the repatriation does not exceed BDT 1.00 (One) million. Also such report is not mandatory in case the net asset value is higher than the deal value. In such cases Bangladesh Bank will work out the fair value of share based on the audited financial statements and the documents enclosed in Annexure-B of the target company;
(iii) The valuation certificates by eligible valuer will have to be supported by full explanation justifying the fair value arrived at. If not fully satisfied about appropriateness of the valuation arrived at, Bangladesh Bank reserves the right to reassess the value, based on financial statements submitted along with the application;
(iv) Authorized Dealer (AD) shall forward the permission request for repatriation of sale proceeds of shares in favor of non-resident only after being satisfied that the target company has complied with the provision of Paragraph 2(A) and 2(B), Chapter 9 of GFET regarding issue and transfer of shares in favor of or by non-resident. 
b) Sale of shares owned by resident shareholder to non-resident is subject to fair value determined by Merchant Banker licensed by BSEC or a Chartered Accountant, for sales/transfer value of shares exceeding BDT 1.00 (One) million. Resident shareholder receiving payment against sales of shares shall submit valuation report to the AD and MoU for share sale-purchase agreement together with Form-C for encashment of  inward remittances on account of sales proceeds of shares. AD shall report the share transactions to the Foreign Exchange Investment Department, Bangladesh Bank, Head Office, Dhaka giving details of documents within 14 days of transfer of shares as per Paragraph 2(B), Chapter 9 of GFET.[...]" (Bangladesh Bank FEID Circular No.- 1, 6 May 2018)
GUIDELINES on Bangladesh Bank Foreign Exchange (Volume I) of 2018
Bangladesh Bank FEID Circular No.- 1, 6 May 2018
[<a href="https://www.bb.org.bd/aboutus/regulationguideline/foreignexchange/fegvol1.php">Guidelines</a>],[<a href="https://www.bb.org.bd/mediaroom/circulars/feid/may062018feid01e.pdf">Circular</a>]