引言为什么签约不等于成交
许多第一次参与美国大型交易的企业家和高管会有一个误解：以为买卖双方签了购买协议，交易就基本完成了。事实恰恰相反——在美国，签约（signing）和交割（closing）之间通常隔着数月甚至超过一年的监管审批流程。
一笔十亿美元级别的并购交易，可能需要同时面对联邦反垄断机构、国家安全审查委员会、证券监管机构以及多个州级监管部门的审查。任何一道审批受阻，都可能导致交易延迟、条件修改甚至彻底流产。
本文将系统梳理美国大型交易中最常见的五类审批关卡，帮助你在交易规划阶段就建立起完整的监管地图。
"在美国做大型交易，不怕对手出价高，就怕监管审批拖。时间本身就是最大的交易风险。"
一HSR反垄断审查——最常见的第一道关
几乎所有达到一定规模的并购交易都需要面对的第一道审批，就是哈特-斯科特-罗迪诺法案（Hart-Scott-Rodino Antitrust Improvements Act, HSR）规定的反垄断审查。
HSR申报义务由交易金额和当事方规模两个维度决定。2026年，基本门槛为1.19亿美元（每年根据GNP指数调整）。具体而言：如果交易金额超过1.19亿美元，且买卖双方满足一定的资产/营收规模测试，则双方必须在交割前向FTC和DOJ提交HSR申报表。
关键提示：如果交易金额超过4.782亿美元（2026年标准），无论当事方规模如何，都必须申报——这是"仅看交易金额"的绝对门槛。
审查流程分为两个阶段：
第一阶段：申报提交后，FTC和DOJ有30天的初步审查期（现金要约收购为15天）。大多数交易在这一阶段获得"早期终止"（Early Termination）或等待期自然届满，即获准交割。
第二阶段：如果监管机构认为交易可能存在反竞争问题，会发出"第二次请求"（Second Request），要求提交大量补充材料。第二次请求的合规成本极高——通常涉及数百万页文件审查和高管访谈，耗时6至18个月不等。
时间线
30天 → 6-18个月
第一阶段30天（快的话15天早期终止）。第二次请求后，审查时间可达6-18个月。
监管机构
FTC 或 DOJ
两个机构"分案"审查。科技和医药归FTC，电信和金融归DOJ。但分案规则并非完全固定。
后果
禁令或强制剥离
FTC/DOJ可以向联邦法院申请临时禁令阻止交割，或要求当事方剥离部分业务作为批准条件。
实操要点：许多买方在签约前就聘请反垄断律师进行市场份额分析，判断交易是否可能遭遇第二次请求。如果买卖双方在同一市场有高度重叠，提前准备剥离方案（fix-it-first或consent decree）可以显著缩短审查时间。
二CFIUS国家安全审查——跨境交易的核心关卡
如果交易涉及外国买方，尤其是来自中国、俄罗斯等"受关注国家"的买方，美国外国投资委员会（CFIUS）的国家安全审查几乎是绕不过的关卡。
CFIUS由财政部牵头，成员包括国防部、国务院、商务部等九个联邦机构。其审查权限在2018年《外国投资风险审查现代化法案》（FIRRMA）后大幅扩展，不仅覆盖控制权收购，还延伸到特定类型的非控制性投资和房地产交易。
如果目标公司属于"TID"类别——即涉及关键技术（Technology）、关键基础设施（Infrastructure）或敏感个人数据（Data）——且买方来自受关注国家或与此类国家有实质关联，则必须在交割前提交强制申报（mandatory declaration）。
关键提示：即使交易不属于强制申报范围，CFIUS仍有权在交割后5年内主动发起审查并强制要求剥离。因此，涉及敏感行业的交易通常会选择"自愿申报"以锁定确定性。
审查流程的三个阶段：
简短申报（Declaration）— 30天
适用于低风险交易。CFIUS可以在30天内批准、要求转入正式申报、或不做处理。
正式申报（Notice）第一阶段 — 45天
CFIUS进行全面审查。约半数交易在第一阶段获得批准（clearance）。
第二阶段调查（Investigation）— 额外45天
如果第一阶段未能得出结论，进入45天调查期。调查结束后可批准、附条件批准（签署NSA/mitigation agreement），或提交总统做最终决定。
2026年，涉及中国买方的交易平均审查时间已达到270天，远超法定最短时间框架。这是因为当事方与CFIUS之间的"预申报沟通"和NSA谈判通常在正式时钟之外进行。
三SEC证券监管审批——上市公司交易的必经之路
当交易涉及上市公司，或者交易对价中包含股票（stock-for-stock merger），美国证券交易委员会（SEC）的审查就不可避免。
SEC审查的几个核心触发点：
代理声明
Proxy Statement / 股东投票材料
如果交易需要目标公司股东投票批准（大多数上市公司并购都需要），公司必须向SEC提交代理声明（Schedule 14A），披露交易条款、财务顾问意见、管理层利益冲突等全部重大信息。
注册声明
Registration Statement (Form S-4)
如果买方以自身股票作为对价，需要在SEC注册新发行的股票。S-4文件的审查往往更加严格，尤其关注pro forma财务信息和风险因素披露。
要约收购
Tender Offer (Schedule TO / 14D-9)
要约收购中，买方需提交Schedule TO，目标公司董事会需提交14D-9（推荐或反对意见）。SEC对要约收购文件的审查节奏通常更快，但对披露质量要求极高。
实操要点：SEC审查的核心不是"批准或否决"交易本身，而是确保信息披露的充分性和准确性。但如果SEC持续发出comment letter要求修改披露，会显著延迟股东投票时间表，间接影响交割进度。经验丰富的证券律师通常会在提交前进行"pre-filing"沟通以加速流程。
四行业特定审批——被忽视的"隐形关卡"
除了上述三大横向审批之外，许多行业还有自己的监管机构和审批要求。这些"隐形关卡"经常被交易方低估，却可能成为交割的最大障碍。
电信
FCC审批
涉及无线频谱许可证、广播电视牌照或国际通信线路的交易，需获得联邦通信委员会（FCC）批准。FCC有独立的国家安全审查程序（Team Telecom）。审查时间：6-18个月。
能源
FERC / NRC审批
电力公用事业和天然气管道交易需获得联邦能源监管委员会（FERC）批准。核电相关交易还需核管理委员会（NRC）许可。审查时间：6-12个月。
银行与保险
联邦和州级金融监管
银行并购需获得OCC、FDIC或美联储批准（取决于银行类型）。保险公司并购需获得每个运营州保险监管局的批准，50州的要求各不相同。审查时间：3-12个月。
国防
DDTC / 出口管制
目标公司如果持有国防合同或涉及ITAR管控物项，控制权变更需通知国防贸易管制局（DDTC）。涉及EAR管控技术的交易也可能需要商务部审批。
实操要点：行业审批的难度在于其"碎片化"——没有一个统一的清单告诉你需要哪些许可。最佳做法是在尽职调查阶段对目标公司持有的所有许可证、牌照和政府合同进行全面梳理，识别出哪些涉及控制权变更通知或审批义务。
五州级审批——不要忘记"最后一公里"
美国是联邦制国家，许多监管权力保留在州级层面。以下几类州级审批经常出现在大型交易中：
州反垄断
州检察长的反垄断审查
即使联邦层面HSR审查已经通过，州检察长仍有独立权力对交易进行反垄断审查。在医疗、零售和农业领域，州检察长的审查越来越活跃。近年来，多个州联合起诉阻止大型并购的案例屡见不鲜。
保险监管
州保险监管局审批
保险公司并购必须获得其注册州和主要运营州保险监管局的"控制权变更"批准。审查重点包括买方的财务实力、运营计划以及对保单持有人的影响。多州并行审批可能耗时6-12个月。
公用事业
州公共事业委员会审批
电力、天然气和水务公司的交易需获得相关州公共事业委员会（PUC）批准。PUC审查关注交易对费率的影响、服务质量保障和就业承诺。这是能源并购中最耗时的审批之一。
六全景图：一笔交易可能面对多少审批？
让我们以一个假设场景说明——一家中国科技公司以股票加现金方式收购一家美国上市电信公司：
HSR反垄断申报 — 交易金额超过门槛，必须申报。如果双方在美国电信市场有重叠业务，可能触发第二次请求。
CFIUS国家安全审查 — 中国买方+电信行业=几乎确定触发强制申报。审查时间可能超过一年。
SEC注册声明 — 对价包含股票，需提交S-4注册声明并获SEC审核通过。
FCC审批 — 目标公司持有无线频谱许可证，需FCC批准控制权变更。Team Telecom将进行独立国安审查。
州PUC审批 — 如果目标公司在多个州提供电信服务，可能需要多个州PUC批准。
总时间估计：18-24个月。这就是为什么大型跨境交易的购买协议中通常会设置18个月甚至更长的"长停日期"（outside date / long-stop date）。
七结语：监管地图是交易战略的一部分
在美国做大型交易，法律尽职调查的范围不能只看目标公司的合同和财务。监管审批的路线图——需要哪些审批、每个审批的风险等级、预计时间线——本身就是交易可行性分析的核心组成部分。
最成功的交易方，往往是在签约前就画好了完整的监管地图，预判了每一道关卡的通过概率和应对方案。在审批的世界里，早一步准备，可能就是早一年交割。
"大型交易的成败，三分靠商业谈判，七分靠监管策略。"
IntroductionWhy Signing Is Not Closing
Many first-time participants in major U.S. transactions share a common misconception: that once the purchase agreement is signed, the deal is essentially done. The reality is the opposite — in the United States, signing and closing are often separated by months, sometimes more than a year, of regulatory approvals.
A billion-dollar acquisition may simultaneously face scrutiny from federal antitrust enforcers, the national security review committee, securities regulators, and multiple state-level agencies. Any single gatekeeper can delay, modify, or kill a deal.
This article systematically maps the five most common categories of regulatory approvals in major U.S. transactions, helping you build a complete regulatory roadmap at the deal planning stage.
"In major U.S. deals, the biggest risk isn't a higher competing bid — it's regulatory delay. Time itself is the deal's greatest enemy."
IHSR Antitrust Review — The Most Common First Gate
The first regulatory hurdle for virtually any transaction above a certain size is the antitrust review mandated by the Hart-Scott-Rodino Antitrust Improvements Act (HSR).
HSR filing obligations are determined by two dimensions: transaction value and party size. In 2026, the base threshold is $119 million (adjusted annually by GNP index). Specifically: if the transaction value exceeds $119 million and both parties meet certain asset/revenue size tests, both must file an HSR notification with the FTC and DOJ before closing.
Key point: If the transaction value exceeds $478.2 million (2026 standard), filing is mandatory regardless of party size — this is the absolute "transaction size only" threshold.
The review process has two phases:
Phase I: After filing, the FTC and DOJ have a 30-day initial review period (15 days for cash tender offers). Most transactions receive "Early Termination" or the waiting period expires naturally in this phase, clearing the way to close.
Phase II: If the agencies believe the transaction may raise competitive concerns, they issue a "Second Request" demanding extensive supplemental materials. Second Request compliance is extraordinarily expensive — typically involving millions of pages of document review and executive depositions, taking 6 to 18 months.
Timeline
30 Days → 6-18 Months
Phase I: 30 days (Early Termination possible in 15 days). After a Second Request, review can take 6-18 months.
Agencies
FTC or DOJ
The two agencies "clear" deals between themselves. Tech and pharma typically go to FTC; telecom and financial services to DOJ. But allocation rules aren't rigid.
Consequences
Injunction or Forced Divestiture
The FTC/DOJ can seek a federal court injunction to block closing, or require divestitures as a condition of approval.
Practical tip: Many acquirers retain antitrust counsel before signing to perform market share overlap analysis and assess whether a Second Request is likely. If the parties have significant overlap, preparing a divestiture package (fix-it-first or consent decree) in advance can meaningfully shorten review time.
IICFIUS National Security Review — The Core Cross-Border Gate
When a deal involves a foreign acquirer — especially one from a "country of concern" such as China or Russia — the Committee on Foreign Investment in the United States (CFIUS) national security review is virtually unavoidable.
CFIUS is chaired by the Treasury Department and includes nine federal agencies: Defense, State, Commerce, and others. Its authority expanded dramatically under the Foreign Investment Risk Review Modernization Act (FIRRMA) of 2018, reaching beyond controlling acquisitions to cover certain non-controlling investments and real estate transactions.
If the target company falls within the "TID" categories — critical Technology, critical Infrastructure, or sensitive personal Data — and the acquirer is from or has substantial ties to a country of concern, a mandatory declaration must be filed before closing.
Key point: Even if a transaction doesn't trigger mandatory filing, CFIUS retains authority to initiate review up to 5 years post-closing and can mandate divestiture. Transactions involving sensitive sectors typically opt for voluntary filing to lock in certainty.
The three-stage review process:
Short-Form Declaration — 30 Days
For lower-risk transactions. CFIUS can approve, request a full notice, or take no action within 30 days.
Full Notice — Phase I: 45 Days
CFIUS conducts a comprehensive review. Roughly half of all transactions are cleared at the Phase I stage.
Phase II Investigation — Additional 45 Days
If Phase I is inconclusive, a 45-day investigation period follows. The investigation may result in approval, conditional approval (NSA/mitigation agreement), or referral to the President for a final decision.
In 2026, transactions involving Chinese acquirers have averaged 270 days under review — far exceeding the statutory minimum timeline. This is because pre-filing consultations and NSA negotiations between parties and CFIUS typically occur "off the clock."
IIISEC Review — The Mandatory Path for Public Company Deals
When a transaction involves a public company, or when the deal consideration includes stock (stock-for-stock merger), review by the Securities and Exchange Commission (SEC) is unavoidable.
Key SEC review triggers:
Proxy Statement
Schedule 14A — Shareholder Voting Materials
If the transaction requires shareholder approval (most public M&A does), the company must file a proxy statement (Schedule 14A) disclosing all material information: deal terms, financial advisor opinions, management conflicts of interest, and more.
Registration Statement
Form S-4 — Stock-for-Stock Deals
If the acquirer uses its own stock as consideration, the newly issued shares must be registered with the SEC. S-4 review is often more rigorous, with particular focus on pro forma financials and risk factor disclosure.
Tender Offer
Schedule TO / Schedule 14D-9
In tender offers, the acquirer files Schedule TO and the target board files a 14D-9 recommendation statement. SEC review of tender offer documents is typically faster, but disclosure quality standards are extremely high.
Practical tip: SEC review is fundamentally about disclosure adequacy, not approving or blocking the deal itself. However, ongoing comment letters requiring disclosure amendments can significantly delay the shareholder vote timeline, indirectly impacting closing. Experienced securities counsel typically engage in "pre-filing" consultations to accelerate the process.
IVIndustry-Specific Approvals — The Overlooked "Hidden Gates"
Beyond the three major horizontal reviews, many industries have their own regulators and approval requirements. These "hidden gates" are frequently underestimated by deal parties, yet can become the biggest obstacles to closing.
Telecom
FCC Approval
Deals involving wireless spectrum licenses, broadcast licenses, or international communication lines require Federal Communications Commission (FCC) approval. The FCC has its own national security review process (Team Telecom). Timeline: 6-18 months.
Energy
FERC / NRC Approval
Electric utility and natural gas pipeline deals require Federal Energy Regulatory Commission (FERC) approval. Nuclear-related transactions also need Nuclear Regulatory Commission (NRC) licensing. Timeline: 6-12 months.
Banking & Insurance
Federal and State Financial Regulators
Bank mergers require OCC, FDIC, or Federal Reserve approval (depending on charter type). Insurance company acquisitions require approval from every state where the insurer operates — requirements vary across all 50 states. Timeline: 3-12 months.
Defense
DDTC / Export Controls
If the target holds defense contracts or handles ITAR-controlled items, change of control requires notification to the Directorate of Defense Trade Controls (DDTC). Deals involving EAR-controlled technology may also need Commerce Department approval.
Practical tip: The difficulty with industry-specific approvals is their fragmentation — there is no unified checklist. Best practice is to conduct a comprehensive inventory during due diligence of all licenses, permits, and government contracts held by the target, identifying which ones carry change-of-control notification or approval obligations.
VState-Level Approvals — Don't Forget the "Last Mile"
The United States is a federal system, and significant regulatory authority resides at the state level. Several categories of state-level approvals frequently appear in major transactions:
State Antitrust
State Attorney General Antitrust Review
Even after federal HSR clearance, state attorneys general retain independent authority to challenge transactions on antitrust grounds. In healthcare, retail, and agriculture, state AG enforcement has become increasingly aggressive. Multi-state coalition lawsuits to block major mergers have become common.
Insurance Regulation
State Insurance Commissioner Approval
Insurance company acquisitions must obtain "change of control" approval from the state of domicile and major operating states. Review focuses on the acquirer's financial strength, operating plans, and impact on policyholders. Multi-state parallel review can take 6-12 months.
Utilities
State Public Utility Commission Approval
Electric, gas, and water utility transactions require approval from relevant state public utility commissions (PUCs). PUC review focuses on rate impact, service quality assurances, and employment commitments. This is often the most time-consuming approval in energy M&A.
VIThe Big Picture: How Many Approvals Can One Deal Face?
Consider a hypothetical scenario — a Chinese technology company acquiring a U.S. publicly traded telecom company using a stock-and-cash mix:
HSR Antitrust Filing — Transaction exceeds the threshold; filing required. Second Request possible if the parties have overlapping U.S. telecom operations.
CFIUS National Security Review — Chinese acquirer + telecom industry = near-certain mandatory filing. Review may exceed one year.
SEC Registration Statement — Stock consideration requires an S-4 registration statement reviewed and declared effective by the SEC.
FCC Approval — Target holds wireless spectrum licenses; FCC must approve the change of control. Team Telecom will conduct an independent national security review.
State PUC Approvals — If the target provides telecom services in multiple states, several state PUC approvals may be required.
Total estimated timeline: 18-24 months. This is why purchase agreements for major cross-border deals typically include an 18-month or longer "outside date" (long-stop date).
VIIConclusion: The Regulatory Map Is Part of Deal Strategy
In major U.S. transactions, legal due diligence cannot be limited to the target's contracts and financials. The regulatory approval roadmap — which approvals are needed, the risk level of each, estimated timelines — is itself a core component of deal feasibility analysis.
The most successful dealmakers are those who draw the complete regulatory map before signing, predict the probability of clearance at each gate, and prepare contingency plans. In the world of regulatory approvals, preparing one step earlier may mean closing one year sooner.
"In major deals, 30% is commercial negotiation; 70% is regulatory strategy."
关于作者About the Author
Evonne Xu — 并购律师 · AI法律工程师
Evonne Xu — M&A Lawyer · AI Legal Engineer
专注于中美跨境并购与AI法律合规，同时也是法律科技工具的构建者。如果你正在规划一笔赴美交易，欢迎联系。
Specializing in U.S.-China cross-border M&A and AI legal compliance, and a builder of legal tech tools. If you're planning a U.S.-bound transaction, get in touch.