BXP is down about 3.25% as the market prices in renewed equity-supply risk following the company’s March 6, 2026 capital-markets update. In an SEC filing, BXP replaced its prior at-the-market program with a new $1.0 billion ATM framework, which can be used to sell common shares directly into the market over time, creating a potential supply/dilution overhang.

The March 6 filing set up a new $1.0 billion ATM equity offering program and also refreshed prospectus supplements tied to other potential share flows. Those include up to 13,252,000 shares that may be resold by certain holders in connection with the partnership’s 2.00% exchangeable senior notes due 2030, plus a smaller amount of shares that could be issued from time to time through partnership-unit redemptions—together adding to perceived incremental share supply even if no immediate issuance is announced.

Office REIT valuations are highly sensitive to balance-sheet flexibility and the cost of capital, so the market often reacts quickly to any structure that increases the probability of equity issuance. With BXP trading in the low-$50s, the existence of a large ATM capacity can weigh on the stock price because investors anticipate the company could opportunistically sell shares to fund development, repay debt, or manage maturities—actions that may strengthen liquidity but can dilute existing holders if executed at depressed prices.

Investors will be watching for any follow-on SEC updates or quarterly disclosures that show whether BXP has begun tapping the ATM and at what pace. Traders will also focus on signs of incremental share issuance pressure from the exchangeable-notes ecosystem (including exchanges that could lead to share delivery) and any management commentary about how equity financing fits into the company’s near-term capital plan.