[SCHEDULE 13G/A] SITIME Corp Amended Passive Investment Disclosure

Rhea-AI Filing Summary

MegaChips Corporation, a Japan-based company traded on the Tokyo Stock Exchange, reported beneficial ownership of SiTime Corp common stock in an amended Schedule 13G. MegaChips holds 3,420,000 shares, representing 13.1% of SiTime’s outstanding common stock as of the event date.

MegaChips has sole voting and sole dispositive power over all 3,420,000 shares, with no shared voting or dispositive power. The percentage is calculated against 26,100,630 shares outstanding as of November 1, 2025, as reported by SiTime in a recent quarterly report.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 5)

SITIME CORP

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

82982T106

(CUSIP Number)

12/31/2025

(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)

SCHEDULE 13G

CUSIP No. 82982T106

1

Names of Reporting Persons

MEGACHIPS CORP /FI

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

JAPAN

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,420,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,420,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,420,000.00

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)

13.1 %

12

Type of Reporting Person (See Instructions)

CO

Comment for Type of Reporting Person: Percentage ownership is based on 26,100,630 shares outstanding as of November 1, 2025, as reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 6, 2025.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: SITIME CORP
(b)	Address of issuer's principal executive offices: SITIME CORPORATION, 5451 PATRICK HENRY DRIVE, SANTA CLARA, CA, 95054.
Item 2.
(a)	Name of person filing: MegaChips Corporation
(b)	Address or principal business office or, if none, residence: 1-1-1 Miyahara, Yodogawa-ku Osaka 532-0003 Japan
(c)	Citizenship: MegaChips Corporation is based in Japan and traded on the Tokyo Stock Exchange.
(d)	Title of class of securities: Common Stock, par value $0.0001 per share
(e)	CUSIP No.: 82982T106
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: 3420000
(b)	Percent of class: 13.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 3420000
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 3420000
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
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:
	Not Applicable

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.

MEGACHIPS CORP /FI

Signature:	/s/ Tetsuo Hikawa
Name/Title:	Tetsuo Hikawa/President and CEO
Date:	01/30/2026