Xencor Inc. (XNCR) beneficial ownership amendment reports that PRIMECAP Management Co. beneficially owned 9,879,855 common shares, or 13.29%, as of September 30, 2026.
Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.
Xencor Inc. (XNCR) beneficial ownership amendment reports that PRIMECAP Management Co. beneficially owned 9,879,855 common shares, or 13.29%, as of September 30, 2026. It reported sole voting and dispositive power over 9,879,855 shares and shared voting and dispositive power over 0 shares. PRIMECAP Odyssey Aggressive Growth Fund was identified as having an interest in more than 5% of Xencor’s outstanding common stock. Chief Compliance Officer Jennifer A. Ottosen signed the amendment.
Key Figures
Beneficially owned:9,879,855 sharesPercent of class:13.29%Sole voting power:9,879,855 shares+3 more
6 metrics
Beneficially owned9,879,855 sharesAs of September 30, 2026
Percent of class13.29%Xencor common stock
Sole voting power9,879,855 sharesPRIMECAP Management Co.’s reported power
Sole dispositive power9,879,855 sharesPRIMECAP Management Co.’s reported power
Shared voting power0 sharesPRIMECAP Management Co.’s reported power
Shared dispositive power0 sharesPRIMECAP Management Co.’s reported power
Key Terms
Amount beneficially owned, Sole power to vote or to direct the vote, Sole power to dispose or to direct the disposition
3 terms
Amount beneficially ownedregulatory
"Amount beneficially owned: 9,879,855"
Sole power to vote or to direct the voteregulatory
"Sole power to vote or to direct the vote: 9,879,855"
Sole power to dispose or to direct the dispositionregulatory
"Sole power to dispose or to direct the disposition: 9,879,855"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many XNCR shares did PRIMECAP Management Co. report beneficially owning?
PRIMECAP Management Co. reported beneficial ownership of 9,879,855 XNCR common shares as of September 30, 2026.
What percentage of XNCR did PRIMECAP Management Co. report?
PRIMECAP Management Co. reported beneficial ownership of 13.29% of Xencor’s common stock as of September 30, 2026.
Which fund was identified with an interest of more than 5% in XNCR?
PRIMECAP Odyssey Aggressive Growth Fund was identified as having an interest of more than 5% of Xencor’s outstanding common stock.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 18)
Xencor Inc
(Name of Issuer)
COM
(Title of Class of Securities)
98401F105
(CUSIP Number)
09/30/2026
(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):
98401F105
1
Names of Reporting Persons
PRIMECAP MANAGEMENT CO/CA/
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
9,879,855.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
9,879,855.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
9,879,855.00
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)
13.29 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Xencor Inc
(b)
Address of issuer's principal executive offices:
465 N. HALSTEAD ST., SUITE 200, PASADENA, CALIFORNIA
91107
Item 2.
(a)
Name of person filing:
PRIMECAP MANAGEMENT CO/CA/
(b)
Address or principal business office or, if none, residence:
177 EAST COLORADO BLVD.
11TH FLOOR
PASADENA, California
91105
(c)
Citizenship:
PRIMECAP MANAGEMENT CO/CA/ - UNITED STATES
(d)
Title of class of securities:
COM
(e)
CUSIP No.:
98401F105
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:
9,879,855
(b)
Percent of class:
13.29 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
PRIMECAP MANAGEMENT CO/CA/ - 9,879,855
(ii) Shared power to vote or to direct the vote:
PRIMECAP MANAGEMENT CO/CA/ - 0
(iii) Sole power to dispose or to direct the disposition of:
PRIMECAP MANAGEMENT CO/CA/ - 9,879,855
(iv) Shared power to dispose or to direct the disposition of:
PRIMECAP MANAGEMENT CO/CA/ - 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.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
Various Persons have the right to receive, or the power to direct the receipt of, dividends from, or proceeds from the sale of, with respect to the securities as to which this Schedule is filed. No one Person here has an interest more than five percent of this class of securities except as follows: PRIMECAP Odyssey Aggressive Growth Fund has an interest of more than five percent of the total outstanding common stock of Xencor, Inc.
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.
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.
