Rocket Lab Corporation (NASDAQ:RKLB) experienced a sharp decline of 11.2% in midday trading on Thursday, with shares falling to $67.63. This price action pushed the stock below the lower collar of its merger agreement with Iridium Communications Inc. (NASDAQ:IRDM), a critical threshold that alters the deal's financial mechanics. The move occurred despite positive news from the company's space operations, including a successful full-duration test of the Neutron upper-stage engine.
The lower collar at $67.50 is not merely a technical marker but a pivotal point in the acquisition structure. If the 10-day volume-weighted average price (VWAP) before closing falls at or below this level, Iridium shareholders will receive 0.4 Rocket Lab shares plus $27 in cash. For every dollar the stock drops below the floor, the stock portion of the payout decreases by 40 cents, shifting incremental risk to Iridium holders. Above the collar, a lower price actually increases the exchange ratio to preserve $27 of stock value, but below it, that protection disappears.
Thursday's brief intraday breach, with shares touching a low of $67.20, does not automatically set the final consideration, as the calculation uses a 10-day VWAP. However, the significance of the level is immediate. Based on live market values, Rocket Lab's equity loss for the day was estimated at approximately $5.2 billion. The preliminary gross deal spread for Iridium stood at 14.4%, with Iridium shares trading around $47.08.
Positive Engine News Overshadowed
On the operational front, Rocket Lab achieved a key milestone by completing a full-duration burn of its AVac engine at NASA's Stennis Space Center, lasting just under 5.5 minutes. The company described the test as "critical preparation for Neutron's first flight," which remains targeted for later in 2026. However, the company's latest quarterly filing acknowledges that development complexity could cause further delays, and first-quarter research spending rose 46% to $80.5 million.
Piper Sandler analyst Alexander Potter initiated coverage on Rocket Lab with a Neutral rating and an $83 price target. In his note, Potter expressed a preference for AST SpaceMobile (NASDAQ:ASTS), citing its "more palatable valuation" and clearer path to EBITDA.
Broader Market and Financing Context
The broader market was also weak, with the Invesco QQQ Trust (NASDAQ:QQQ) falling 1.0% as chip stocks led losses. Rocket Lab underperformed the tech-heavy ETF by approximately 10.3 percentage points. Additionally, Rocket Lab has commitments for a $3.6 billion bridge facility, which is 2.4 times its March cash and marketable securities, highlighting the financing needs tied to the Iridium acquisition.
Iridium provides the financial offset to support the deal. The company reported $871.7 million in 2025 revenue and $495 million in company-defined OEBITDA. These recurring cash flows underpin the acquisition case, but risks remain. Neutron's debut could slip, regulatory approvals may delay the transaction, and a qualifying VWAP below $67.50 would reduce Iridium's stock consideration. New equity financing could also dilute Rocket Lab shareholders.
The price action suggests that investors are treating Rocket Lab primarily as merger currency, with financing terms outweighing the positive engine test. For now, the market is focused on the deal's mechanics rather than operational milestones.
