Registered direct offering: shelf shares sold straight to chosen investors

The structure in one sentence

A registered direct offering (RDO) is a sale of registered securities, usually taken down from an effective shelf registration statement, to a small group of investors lined up by a placement agent, without a broad public marketing process.

It is "registered" because the shares come off an effective registration statement and investors receive freely tradable shares at closing. It is "direct" because a placement agent introduces the buyers and the company sells to them directly, rather than an underwriter buying the whole deal and reselling it.

How it differs from its neighbors

The practical difference for share supply: RDO investors can generally sell soon after closing because the shares are already registered. PIPE investors usually wait for a resale registration to become effective.

Why the timing feels sudden

An RDO is usually negotiated privately while the market is closed. A placement agent contacts a small number of investors, they agree on a price, the purchase agreement is signed, and the company announces the deal, often before the next open or after the close. The 424B5 must be filed within two business days of pricing or first use (Lesson 10), and closing usually follows within one or two trading days.

For a reader, that means the first public evidence and the price arrive at the same moment. There is no marketing period like an underwritten deal and no gradual sale like an ATM. What you can measure from the documents:

• Discount to the last close before pricing, using the date the filing names.
• Fees: placement agents commonly charge a percentage of gross proceeds plus expenses; the exact figure is on the cover.
• Size relative to shares outstanding, using the filing's own base and date.
• Add-ons: pre-funded warrants for investors near ownership limits, and warrants sold privately on the side.

None of these predicts the next price move. They describe what was sold, to whom, at what price, and what potential shares came with it.

The usual paper trail

An RDO typically leaves three or four public footprints:

1. Securities purchase agreement, signed by the company and investors.
2. Rule 424(b)(5) prospectus supplement (Lesson 10) naming the number of shares, the price, the placement agent fee, and the expected closing date.
3. Form 8-K, often under Item 1.01, attaching the agreement and any warrant forms. If warrants are sold privately alongside the shares, the 8-K may also use Item 3.02.
4. A later resale registration if privately sold warrants came with the deal.

Walkthrough: Dyadic International, August 2026

Main source: Dyadic International, Inc. 424B5 prospectus supplement dated August 13, 2026, filed the same day. Figures are quoted or derived from that filing unless another filing is cited. Checked through October 5, 2026.

Step 1: what is being sold, and at what price

• 3,625,000 shares of common stock in a registered direct offering.
• Price: $0.795 per share.
• Last reported sale price on August 12, 2026: $0.88. Our arithmetic: $0.795 ÷ $0.88 ≈ 0.903, about 9.7% below that close.
• Gross proceeds: $2,881,875.00. Placement agent fee: $201,731.25 (7% of gross). Proceeds before expenses: $2,680,143.75. The company estimates other expenses at about $0.4 million and net proceeds at about $2.28 million.

Step 2: shares outstanding before and after

The supplement bases its numbers on 36,438,703 shares outstanding as of August 11, 2026, and states 40,063,703 after the offering:

3,625,000 ÷ 36,438,703 ≈ 9.9% increase in shares outstanding

Step 3: the concurrent private placement

Alongside the RDO, the same investors agreed to buy warrants for 3,625,000 shares at a $0.84 exercise price, paying $0.005 per warrant. The supplement states:

• the warrants are not registered in this offering;
• the private placement closes simultaneously with, and is a condition of, the RDO.

So at closing, outstanding rose by 3,625,000 shares, and a separate potential pool of 3,625,000 warrant shares appeared. Exercising every warrant for cash would bring in about 3,625,000 × $0.84 ≈ $3.05 million, a scenario, not a fact.

Step 4: the baby-shelf disclosure on the cover

Because Dyadic's public float was below $75 million, the cover includes a General Instruction I.B.6 calculation (Lesson 15):

• Public float $45.4 million: 30,888,304 non-affiliate shares as of August 7, 2026, at $1.47, the closing price on July 21, 2026, which the company identifies as the highest closing price within 60 days before the supplement.
• No I.B.6 sales in the prior 12 calendar months.
• Capacity under I.B.6 at that time: up to $15.1 million.

The RDO used about $2.9 million of that. The cover number is a legal ceiling at a date, not a plan to sell $15.1 million.

Step 5: what came after

The last row is not part of the RDO, but it belongs on the same timeline: a minimum bid price notice is often followed by a reverse-split discussion. Do not infer what the company will do; read the next proxy.

The 424B5 also describes 90-day lock-up agreements for executive officers, directors, employees and holders of at least 10% of the common stock. That limits selling by those insiders; it does not restrict the RDO investors.

A trader's RDO checklist

1. Shares, price, and discount to the prior close, with the date of that close.
2. Gross proceeds, fees, and net proceeds.
3. Shares outstanding before and after, with as-of dates.
4. Are any pre-funded warrants (Lesson 13) included? Count them as near-certain shares, not as remote options.
5. Is there a concurrent private placement of warrants? Note count, exercise price, and when they become exercisable.
6. The I.B.6 cover paragraph, if any: public float, price date, prior sales, remaining capacity.
7. Follow-up filings: closing 8-K, resale registration for warrant shares, any lock-ups.

Remember one line

A registered direct offering delivers tradable shares at closing; the warrants that often travel with it are a separate, usually unregistered, potential pool.

Read the primary sources

• Dyadic International, Inc. 424B5 filed August 13, 2026
• Dyadic International, Inc. resale prospectus (424B3) filed September 18, 2026
• Dyadic International, Inc. Form 8-K filed September 25, 2026
• SEC: Securities Act Rule 424, prospectus filing requirements