Reg M Trading Restrictions on Participants

Reg M is the heaviest concentration of compliance-trap questions in the entire Function 2 section. The mechanics are about preventing distribution participants from manipulating the price of the offered security while the offering is underway.

Reg M Definitions

The rule defines four central terms.

A securities offering is "magnitude + special selling efforts," and that combination is what separates a distribution from ordinary trading activity. The participant universe is broad (anyone agreed to participate), and the affiliated-purchaser sweep catches related parties that could otherwise be used to bypass the restrictions.

Exam Tip: Gotchas

• A distribution requires BOTH magnitude AND special selling efforts. A garden-variety secondary trade is not a distribution. A registered offering with a road show and prospectus delivery is.
• "Distribution participant" includes anyone agreed to participate. A prospective underwriter that has not yet signed the agreement is already a participant if there is an understanding to underwrite.

Restricted Period Length

The restricted-period length is calibrated to the security's liquidity. More liquid securities have shorter (or no) restricted periods because the distribution participants' activity is a smaller share of overall trading.

The restricted period ends at pricing for the participant rules. The restricted period for the issuer and selling stockholders (a parallel rule) operates on similar mechanics.

Think of it this way: the more liquid the security, the lighter the touch. A mega-cap actively traded stock has so much daily volume that an underwriter's trading desk is a rounding error in the price discovery. A thinly-traded micro-cap is the opposite: the underwriter's trading could move the price, so the restricted period is the longest.

Exam Tip: Gotchas

• Actively traded securities (worldwide ADTV ≥ $1M AND float ≥ $150M) are EXCEPTED from the restricted period. Both thresholds must be met.
• Mid-cap (ADTV ≥ $100K AND float ≥ $25M) = 1 business day; everything else = 5 business days. Memorize the three-tier ladder.
• The restricted period ends at pricing. Once the deal prices, the participant restriction lifts.

Nasdaq Passive Market Making

A distribution participant that is also a Nasdaq market maker is allowed to continue making markets passively during the restricted period. Without this carve-out, the participant would have to withdraw from market-making entirely.

• Permitted: Continue posting bids and effecting purchases during the restricted period
• Bid cap: Bids and purchases capped at the highest current independent bid (a bid from a non-distribution-participant market maker)
• No stand-alone leading: The distribution participant cannot post a stand-alone bid above the current independent best bid
• Purpose: Preserve liquidity in Nasdaq names without enabling distribution participants to support the price

The mechanic is passive because the distribution participant follows the independent market makers; it cannot lead the bid upward.

Exam Tip: Gotchas

• Nasdaq passive market making caps participant bids at the highest current independent bid, NOT the offering price. The distribution participant cannot lead the bid upward; it can only follow another non-participant maker upward.
• "Passive" means follower, not leader. The participant tracks independent bids; it does not initiate price moves.

Short Selling in Connection with a Public Offering

The short-sale restriction in connection with a public offering is one of the strictest rules in the offering regime. It is structured to prevent manipulative short selling ahead of pricing.

• Restricted period: The shorter of (a) 5 business days before pricing through pricing, or (b) initial registration statement filing through pricing
• Prohibition: Any person who sold short during the restricted period is prohibited from purchasing shares in the offering from an underwriter, broker, or dealer participating in the offering
• Intent is irrelevant: The rule is prophylactic; applies regardless of whether the short seller intended to manipulate
• Bona fide purchase exception: A restricted-period short seller may participate if it makes a bona fide purchase of the security before pricing that meets the rule's quantity and timing tests
• Coverage: Applies to firm-commitment offerings of equity securities (covered offerings)

The rule is strict liability. A hedge fund that routinely shorts stocks can be hit with an enforcement action even where the short was unrelated to the offering. The point of the rule is that the regulator does not have to prove manipulation; the restricted-period short alone is the violation.

Think of it this way: the restricted-period short prohibits a particular trade sequence: short the stock in the days before pricing, then buy the offering at the discount, then cover with the offered shares. That sequence locks in a profit equal to the difference between the higher market price (where the short was placed) and the lower offering price (where the cover comes from). The rule blocks the second leg (buying the offering) for anyone who took the first leg (shorting in the restricted period).

Exam Tip: Gotchas

• The short-sale prohibition is STRICT LIABILITY; no intent required. Hedge funds that routinely short stocks have been hit with enforcement actions even where the short was unrelated to the offering. The prophylactic design is what makes the rule different from manipulation cases.
• The restricted period is the SHORTER of (a) 5 business days before pricing OR (b) the filing-to-pricing window. For an early-priced deal, the filing date may control.
• The bona fide purchase exception is narrow. A restricted-period short seller can participate only by making a qualifying open-market purchase before pricing under specific timing and quantity tests.

Putting It Together

Reg M restrictions interact:

• During the restricted period, distribution participants can NOT trade in the offered security except via Nasdaq passive market making (Nasdaq names only)
• A short seller during the restricted period is barred from participating in the offering (strict liability)
• Stabilization is the carve-out that allows post-pricing price support, capped at the offering price, single bid, single principal market
• The restrictions lift at pricing for participants; stabilization runs from pricing forward

Exam Tip: Gotchas

• Reg M restrictions on participants RUN BEFORE pricing. Stabilization runs AFTER pricing. The two regimes are sequential, not simultaneous.
• The Reg M restrictions and the short-sale prohibition are separate rules with separate triggers. A trade that violates one may not violate the other; the exam can test either independently.