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ALTERITY THERAPEUTICS (PRNAF) Stock Price, News & Analysis

PRNAF OTC
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What Changed

Price Move History

Daily moves over 5%
14 17 sessions, September 23, 2025 to October 12, 2026
Largest daily move
+900.2% close of July 20, 2026
1-year change
-28.6% closing prices, September 23, 2025 to October 12, 2026
1-month change
-37.5% closing prices, August 26, 2026 to October 12, 2026

Company Description

Alterity Therapeutics Limited (PRNAF) is identified in its U.S. Securities and Exchange Commission (SEC) filings as a foreign private issuer and a development stage enterprise. The company files reports with the SEC under the Securities Exchange Act of 1934 using Form 20-F as its annual reporting framework and Form 6-K for current reports. According to these filings, Alterity Therapeutics Limited is incorporated outside the United States and maintains its principal executive office in Melbourne, Victoria, Australia.

The company describes itself in SEC documents as a development stage enterprise. This indicates, based on its own characterization, that it is focused on development activities rather than mature, large-scale commercial operations. Its status as a foreign private issuer means it follows specific SEC reporting requirements tailored to non-U.S. companies whose securities trade in U.S. markets.

Regulatory reporting and capital markets activity

Alterity Therapeutics Limited uses Form 6-K filings to provide updates that are incorporated by reference into several registration statements on Form S-8 and Form F-3. These registrations relate to securities that may be offered or issued under U.S. securities law frameworks. The company’s 6-K filings reference multiple active registration statements, reflecting an ongoing relationship with U.S. capital markets.

Recent 6-K reports submitted by Alterity Therapeutics Limited include exhibits covering topics such as an application for quotation of securities, notifications of cessation of securities, changes in substantial holdings, changes in director interests, and notices under Section 708A. These items show that the company reports on changes in its capital structure and significant security holder positions through its current reports.

Development and clinical reporting

In one of its Form 6-K submissions, Alterity Therapeutics Limited includes an exhibit titled "Alterity Presents Phase 2 Data at US Neurology Meeting." This title indicates that the company has reported Phase 2 data and has presented this information at a neurology-focused meeting in the United States. While the detailed scientific or commercial implications are not included in the summary text, the exhibit title suggests that the company’s development activities involve clinical-stage work that is of interest to the neurology field.

The combination of being described as a development stage enterprise and presenting Phase 2 data at a neurology meeting suggests that Alterity Therapeutics Limited is engaged in development programs that are sufficiently advanced to reach at least Phase 2 evaluation, as disclosed in its own regulatory filings.

Alterity Therapeutics Limited also uses its 6-K filings to communicate corporate governance and shareholder-related information. One filing references an exhibit titled "Date of AGM and Closing Date for Director Nominations," which indicates that the company discloses the timing of its annual general meeting and the deadline for nominating directors. Other filings reference multiple "Change of Director's Interest Notice" exhibits, as well as a "Change in substantial holding" exhibit, highlighting that the company reports changes in director holdings and substantial shareholdings through formal notices.

These disclosures provide transparency around ownership changes and governance events, as required in its home market and reported to the SEC via Form 6-K.

Use of Form 6-K and incorporation by reference

Each of the referenced Form 6-K filings explicitly states that it is being incorporated by reference into Alterity Therapeutics Limited’s registration statements on Form S-8 and Form F-3. This means that the information contained in those 6-K reports becomes part of the disclosure record for the securities registered under those forms. For investors reviewing PRNAF, these filings are a primary source of information about corporate actions, securities issuances or changes, and selected development updates.

The company’s reliance on Form 20-F and Form 6-K, as stated in the filings, also clarifies that it follows the foreign private issuer reporting regime rather than the domestic U.S. issuer framework.

Location and regulatory identity

According to its SEC filings, Alterity Therapeutics Limited’s principal executive office is located in Melbourne, in the state of Victoria, Australia. The filings repeatedly identify the registrant as "Alterity Therapeutics Limited" and confirm that it is a foreign private issuer under the Exchange Act. The documents also consistently classify the company as a development stage enterprise.

For investors and researchers, the SEC filings for PRNAF offer insight into Alterity Therapeutics Limited’s regulatory status, ongoing capital markets activity, and selected development milestones, particularly those highlighted through its 6-K exhibits.

Stock Performance

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Last updated:
-28.6%
Performance 1 year
$54.6M

ALTERITY THERAPEUTICS (PRNAF) closed at $0.2500 on October 12, 2026. Over the past 12 months, the price has lost 28.6%.

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PRNAF Metrics & Rankings

Price returns through October 12, 2026. Month-to-date and YTD include the first trading day. Ranking links may use different dates.

Latest News

No recent news available for PRNAF.

Short Interest History

Last 12 Months

Short interest in ALTERITY THERAPEUTICS (PRNAF) currently stands at 1.7 thousand shares, down 37.3% from the previous reporting period, representing 0.0% of the float. Since October 2025, short interest has decreased by 99.2%.

Days to Cover History

Last 12 Months

Days to cover for ALTERITY THERAPEUTICS (PRNAF) currently stands at 1000.0 days. The ratio is the reported short interest divided by the average daily trading volume. Across the settlements charted above, it has ranged from 1.0 to 1000.0 days.

PRNAF Company Profile & Sector Positioning

ALTERITY THERAPEUTICS (PRNAF) operates in the Biotechnology industry within the broader Healthcare sector and is listed on the OTC.

Frequently Asked Questions

What is the current stock price of ALTERITY THERAPEUTICS (PRNAF)?

The current stock price of ALTERITY THERAPEUTICS (PRNAF) is $0.25 as of October 12, 2026.

What is the market cap of ALTERITY THERAPEUTICS (PRNAF)?

The market cap of ALTERITY THERAPEUTICS (PRNAF) is approximately $54.6M. Learn more about what market capitalization means .

What is Alterity Therapeutics Limited (PRNAF)?

According to its SEC filings, Alterity Therapeutics Limited is a foreign private issuer and a development stage enterprise that reports under the Securities Exchange Act of 1934 and has securities associated with the symbol PRNAF.

How does Alterity Therapeutics Limited describe its stage of development?

In multiple Form 6-K filings, Alterity Therapeutics Limited is explicitly described as a "development stage enterprise," indicating that it focuses on development activities rather than mature commercial operations.

Where is Alterity Therapeutics Limited based?

SEC filings for Alterity Therapeutics Limited list its principal executive office in Melbourne, in the state of Victoria, Australia.

What SEC forms does Alterity Therapeutics Limited use for reporting?

Alterity Therapeutics Limited reports as a foreign private issuer using Form 20-F for annual reporting and Form 6-K for current reports, as stated in its SEC filings.

What types of information does Alterity Therapeutics Limited disclose on Form 6-K?

Recent Form 6-K filings include exhibits such as an application for quotation of securities, notifications of cessation of securities, changes in substantial holdings, changes in director interests, notices under Section 708A, and a presentation of Phase 2 data at a U.S. neurology meeting.

What does the Phase 2 data disclosure indicate about Alterity Therapeutics Limited?

One Form 6-K includes an exhibit titled "Alterity Presents Phase 2 Data at US Neurology Meeting," indicating that the company has reached at least Phase 2 in a development program and has presented related data in a neurology-focused setting.

How are Alterity Therapeutics Limited’s 6-K filings used in relation to its registration statements?

Each referenced Form 6-K states that it is incorporated by reference into Alterity Therapeutics Limited’s registration statements on Form S-8 and Form F-3, meaning the information in those 6-Ks becomes part of the disclosure record for those registered securities.

What governance and shareholder information does Alterity Therapeutics Limited report?

Through its Form 6-K filings, Alterity Therapeutics Limited reports items such as the date of its annual general meeting and closing date for director nominations, change of director’s interest notices, and changes in substantial holdings.