Alta Partners LLC (NASDAQ: QTI) reports 540,842 shares, 4.3% stake

Rhea-AI Filing Summary

QT Imaging Holdings, Inc. Schedule 13G/A shows Alta Partners LLC reports beneficial ownership of 540,842 shares of Common Stock, representing 4.3% of the class; these shares are described as issuable upon exercise of warrants. The filing is signed by Steven Cohen as Managing Member on 05/08/2026.

Insights

Institutional Ownership Analyst

Alta Partners discloses a 4.3% stake via warrants-linked shares.

The filing lists 540,842 shares beneficially owned and states these represent shares issuable upon exercise of warrants. The holding is recorded with sole voting and dispositive power and a 4.3% ownership percentage.

Cash‑flow treatment and exercise timing are not stated in the excerpt; subsequent filings or company disclosures would show whether these warrants are exercisable and when any shares may be issued.

Corporate Governance Specialist

Holder asserts passive intent and limited control influence.

The signature block includes a certification that the securities "were not acquired and are not held for the purpose of or with the effect of changing or influencing the control" of the issuer. Ownership is presented as sole voting and dispositive power for the reported shares.

Investors may watch for amendments or Form 4s if exercises or other transactions occur; timing and mechanics are not provided here.

Key Figures

Beneficially owned shares: 540,842 shares Percent of class: 4.3% CUSIP: 746962109 +1 more

4 metrics

Beneficially owned shares 540,842 shares Amount beneficially owned (shares issuable upon exercise of warrants)

Percent of class 4.3% Percent of Common Stock class reported by Alta Partners

CUSIP 746962109 CUSIP for QT IMAGING HOLDINGS, INC. common stock

Signature date 05/08/2026 Filing signed by Steven Cohen, Managing Member

Key Terms

issuable upon exercise of warrants, beneficially owned, sole dispositive power

3 terms

issuable upon exercise of warrants financial

"representing shares issuable upon exercise of warrants"

beneficially owned regulatory

"Amount beneficially owned: 540,842 shares of Common Stock"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power corporate

"Sole power to dispose or to direct the disposition of: 540,842 shares"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/08/2026 - 04:43 PM Learn about SEC filing dates

FAQ

What stake did Alta Partners LLC report in QTI?

Alta Partners reported 540,842 shares, representing 4.3% of QTI's common stock. The filing states these shares are described as issuable upon exercise of warrants and records sole voting and dispositive power.

Are the reported QTI shares held outright or linked to warrants?

The filing describes the 540,842 shares as "shares issuable upon exercise of warrants." It indicates beneficial ownership tied to warrant exercise rather than plain‑vanilla outstanding shares.

Who signed the Schedule 13G/A for QTI on behalf of Alta Partners?

The Schedule 13G/A is signed by Steven Cohen, Managing Member, with the signature date shown as 05/08/2026. The filing certifies the purpose of the holdings as non‑control related.

What voting and dispositive powers does Alta Partners report for QTI?

Alta Partners reports 540,842 shares as both its sole voting power and sole dispositive power. The filing shows 0 shared voting or dispositive power for these shares.

Does the filing state Alta Partners seeks to influence QTI control?

No. The filing includes a certification stating the securities "were not acquired and are not held for the purpose of or with the effect of changing or influencing the control" of the issuer, per the signature block.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

QT IMAGING HOLDINGS, INC.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

746962109

(CUSIP Number)

05/05/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 746962109

1

Names of Reporting Persons

Alta Partners LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

NEW YORK

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 540,842.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 540,842.00
8	Shared Dispositive Power 540,842.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

540,842.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.3 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: QT IMAGING HOLDINGS, INC.
(b)	Address of issuer's principal executive offices: 3 HAMILTON LANDING, SUITE 160, NOVATO, CALIFORNIA, 94949.
Item 2.
(a)	Name of person filing: Alta Partners LLC
(b)	Address or principal business office or, if none, residence: 1205 Franklin Avenue Garden City, New York 11530
(c)	Citizenship: New York Limited Liability Company
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP No.: 746962109
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 540,842 shares of Common Stock, representing shares issuable upon exercise of warrants.
(b)	Percent of class: 4.3%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 540,842 shares of Common Stock
	(ii) Shared power to vote or to direct the vote: 0 Shares of Common Stock
	(iii) Sole power to dispose or to direct the disposition of: 540,842 shares of Common Stock
	(iv) Shared power to dispose or to direct the disposition of: 0 Shares of Common Stock
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Alta Partners LLC

Signature:	/s/ Steven Cohen
Name/Title:	Steven Cohen, Managing Member
Date:	05/08/2026