Permissible Communications: External (Clients)

The client relationship is where most banker work originates. Pitches turn into engagements, engagements turn into modeling, and modeling depends on inputs only the client has. The rules cover what bankers can collect, what they have to coordinate, and what they cannot do with what they learn.

Information Gathering and Verification

Bankers collect inputs from clients across the full life of an engagement:

• Projections: Management forecasts of revenue, margin, capital expenditure, and free cash flow used in DCF models and lender presentations
• Customer concentration: Top-customer revenue percentages and dependency risk used in pitch decks and offering documents
• Segment splits: Revenue, EBITDA, and asset breakdowns by business line used for sum-of-the-parts (SOTP) analyses
• Working-capital assumptions: Days sales outstanding (DSO), days payable outstanding (DPO), and inventory turnover used in cash-flow modeling and lender models

The verification step is part of the workflow. Bankers cross-check client-supplied numbers against the company's filed 10-K, 10-Q, and audited statements, and against industry benchmarks pulled from commercial databases. A projection that does not tie to the historical financial trend is a red flag for diligence.

Material Nonpublic Information and the Information Barrier

The client almost always shares material nonpublic information (MNPI) during an engagement: the deal itself, the projections, the negotiating dynamics, the names of bidders, the structure of a financing. MNPI triggers the firm's information barrier (also called the "wall" or "Chinese wall"), which separates the private side of the firm (investment banking, private credit, principal investing) from the public side (sales and trading, research, asset management).

• Investment bankers sit on the private side
• The information barrier prevents MNPI from migrating to traders, analysts, or salespeople who would otherwise be tempted to trade on it
• The barrier is policy, supervisory procedure, physical and technical segregation, surveillance, and training, layered together

Coordination requirement: When MNPI is in play, bankers must coordinate with legal and compliance before:

• Sharing client information across desks
• Adding the issuer to the firm's restricted or watch list
• Engaging in any communication that could be perceived as touting or recommending the issuer

Exam Tip: Gotchas

• Bankers are on the PRIVATE side of the wall, not the public side. Sales, trading, and research sit on the public side. Routine cross-side chatter on a deal name without legal and compliance clearance is a wall violation.
• Adding a name to the restricted or watch list is a compliance event, not a banker decision. Bankers flag the name; compliance manages the list.

Confidentiality Agreements and Insider-Trading Exposure

Client information flows under contract. Two documents govern the relationship:

• Engagement letter: Defines the scope of services, fees, indemnification, and confidentiality between the firm and the client. Signed at the start of every formal mandate.
• Nondisclosure agreement (NDA): Signed between the client and any third party (potential buyer, lender, advisor) before confidential information is shared. The banker often runs the NDA process.

Misuse exposure: Information shared by clients is governed by the engagement letter and NDA. Misuse, including trading the issuer's securities on the basis of MNPI received from the client, can implicate federal insider-trading prohibitions under the Exchange Act anti-fraud regime.

The exposure is not limited to the banker who saw the MNPI directly. Tipping liability extends to anyone the banker shares the information with for personal benefit, and the tippee can face liability even without a direct fiduciary duty to the issuer.

Think of it this way: the client hands the banker a sealed envelope. The engagement letter says the banker has to keep it sealed. The NDA covers anyone the banker shows the envelope to. The insider-trading rules say nobody on the chain can trade the issuer's stock until the envelope's contents become public. Three documents, one rule: keep the information where it belongs.

Exam Tip: Gotchas

• MNPI received from a client triggers BOTH the engagement letter / NDA AND federal insider-trading law. Contract breach and securities-law violation are separate exposures from the same act.
• Tipping a friend who then trades creates exposure for the banker, the tippee, and any sub-tippee in the chain. The chain does not have to be long for liability to attach.