Comparable stake leader
BlackRock, Inc.
SEC ownership of Xencor Inc
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001326732.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- XNCR on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001326732
- Issuer location
- Pasadena, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Xencor Inc (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 16%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 16%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
16%
PRIMECAP MANAGEMENT CO/CA/
15%
BIOTECHNOLOGY VALUE FUND L P
10%
RTW INVESTMENTS, LP
8.7%
RA CAPITAL MANAGEMENT, L.P.
6.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
16%
from 13D/G
|
$157,213,171
13,035,918 shares
|
— | 31 Mar 2026 |
| PRIMECAP MANAGEMENT CO/CA/ |
13F
13D/G
Company
|
15%
from 13D/G
|
$124,676,546
10,338,022 shares
|
— | 31 Mar 2026 |
| BIOTECHNOLOGY VALUE FUND L P |
13D/G
BVF PARTNERS L P/IL
|
10%
|
$109,217,253
7,133,720 shares
|
+$38,495,142 | 31 Dec 2025 |
| RTW INVESTMENTS, LP |
13F
13D/G
Company
|
8.7%
from 13D/G
|
$81,736,180
6,777,461 shares
|
— | 31 Mar 2026 |
| RA CAPITAL MANAGEMENT, L.P. |
13F
13D/G
Company
|
6.5%
from 13D/G
|
$59,060,678
4,897,237 shares
|
— | 31 Mar 2026 |
| STATE STREET CORP |
13D/G
13F
STATE STREET CORPORATION · Company
|
6.3%
|
$69,006,059
4,507,254 shares
|
+$12,608,382 | 31 Dec 2025 |
| EcoR1 Capital, LLC |
13D/G
13F
Company
|
2.9%
|
$26,348,810
2,183,000 shares
|
-$29,655,990 | 31 Mar 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
T. Rowe Price Associates, Inc. · Company
|
2.4%
|
$19,862,315
1,693,292 shares
|
$0 | 30 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$3,900,282.
Buys
$0
Insiders: 0
Sells
$3,900,282
Insiders: 9
Net
-$3,900,282
Shares: -268,162
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 268,162
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 33,881 | $0 | $422,125 | -$422,125 |
| 3-6 | 0 | 46,537 | $0 | $527,965 | -$527,965 |
| 6-9 | 0 | 187,744 | $0 | $2,950,192 | -$2,950,192 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-17 of 17 reporting-owner rows connected to Xencor Inc. Open a relationship link for the CIK-to-CIK filing trail.
Rows
17
Largest Forms 3/4/5 holder
Bassil I. Dahiyat
Net 12M change
-$3,900,282
Latest report
18 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Bassil I. Dahiyat | PRESIDENT & CEO, Director | $6,020,238 | -$2,117,266 | -26% | Filing P/S | 05 Mar 2026 |
| John R. Desjarlais | Sr. Vice President & Cso | $2,907,338 | -$1,258,886 | -30% | Filing P/S | 05 Mar 2026 |
| John J. Kuch | Sr. Vice President & Cfo | $2,845,363 | Filing P/S | 11 Mar 2024 | ||
| Allen Yang | Sr. Vice President & Cmo | $1,921,403 | Mixed | 09 Mar 2023 | ||
| Bart Jan Cornelissen | Sr. Vice President & Cfo | $932,520 | -$71,295 | -7.1% | Filing P/S | 10 Apr 2026 |
| Celia Eckert | Svp, General Counsel | $847,613 | -$73,700 | -8% | Filing P/S | 05 Mar 2026 |
| Nancy Valente | EVP, Chief Development Officer | $542,334 | Filing P/S | 02 May 2025 | ||
| Barbara Klencke | Director | $206,752 | Mixed | 12 Jun 2025 | ||
| Alan Bruce Montgomery | Director | $191,383 | -$62,338 | -25% | Filing P/S | 15 Jun 2026 |
| Kurt A. Gustafson | Director | $181,067 | -$67,385 | -27% | Filing P/S | 15 Jun 2026 |
| Dagmar Rosa-Bjorkeson | Director | $175,573 | Filing P/S | 27 Sep 2024 | ||
| Richard J. Ranieri | Director | $168,757 | -$67,385 | -29% | Filing P/S | 15 Jun 2026 |
| Ellen Feigal | Director | $161,160 | -$89,370 | -36% | Filing P/S | 18 Jun 2026 |
| Todd E. Simpson | Director | $143,839 | Mixed | 12 Jun 2025 | ||
| Kevin Charles Gorman | Director | $140,063 | -$92,657 | -40% | Filing P/S | 15 Jun 2026 |
| Yujiro S. Hata | Director | Mixed | 23 Jun 2022 | |||
| Raymond Joseph Deshaies | Director | Mixed | 31 Jul 2025 |
Recent insider transactions for Xencor Inc
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Ellen Feigal | XNCR | Common Stock | Sale | -35.7% | $89,370 | $13.06 | -6,843 | 12,340 | 18 Jun 2026 | Direct |
| Kevin Charles Gorman | XNCR | Common Stock | Sale | -39.8% | $92,657 | $12.31 | -7,527 | 11,378 | 15 Jun 2026 | Direct |
| Kurt A. Gustafson | XNCR | Common Stock | Sale | -27.1% | $67,385 | $12.31 | -5,474 | 14,709 | 15 Jun 2026 | Direct |
| Richard J. Ranieri | XNCR | Common Stock | Sale | -28.5% | $67,385 | $12.31 | -5,474 | 13,709 | 15 Jun 2026 | Direct |
| Alan Bruce Montgomery | XNCR | Common Stock | Sale | -24.6% | $62,338 | $12.31 | -5,064 | 15,547 | 15 Jun 2026 | Direct |
| Bart Jan Cornelissen | XNCR | Common Stock | Sale | -4.41% | $42,990 | $12.29 | -3,499 | 75,898 | 10 Apr 2026 | Direct |
| John R. Desjarlais | XNCR | Common Stock | Sale | -0.94% | $27,571 | $11.02 | -2,502 | 263,831 | 06 Mar 2026 | Direct |
| Celia Eckert | XNCR | Common Stock | Sale | -2.25% | $19,472 | $11.02 | -1,767 | 76,918 | 06 Mar 2026 | Direct |
| Bassil I. Dahiyat | XNCR | Common Stock | Sale | -1.19% | $72,796 | $11.02 | -6,606 | 546,316 | 06 Mar 2026 | Direct |
| John R. Desjarlais | XNCR | Common Stock | Sale | -1.52% | $46,309 | $11.25 | -4,118 | 266,333 | 05 Mar 2026 | Direct |
| Celia Eckert | XNCR | Common Stock | Sale | -3.96% | $36,480 | $11.25 | -3,244 | 78,685 | 05 Mar 2026 | Direct |
| Bart Jan Cornelissen | XNCR | Common Stock | Sale | -3.07% | $28,305 | $11.25 | -2,517 | 79,397 | 05 Mar 2026 | Direct |
| Bassil I. Dahiyat | XNCR | Common Stock | Sale | -2.62% | $167,221 | $11.25 | -14,870 | 552,922 | 05 Mar 2026 | Direct |
| John R. Desjarlais | XNCR | Common Stock | Sale | -0.98% | $31,677 | $11.90 | -2,663 | 270,451 | 03 Mar 2026 | Direct |
| Celia Eckert | XNCR | Common Stock | Sale | -1.79% | $17,747 | $11.90 | -1,492 | 81,929 | 03 Mar 2026 | Direct |
| Bassil I. Dahiyat | XNCR | Common Stock | Sale | -1.18% | $80,387 | $11.90 | -6,758 | 567,792 | 03 Mar 2026 | Direct |
| John R. Desjarlais | XNCR | Common Stock | Award | 10% | 24,907 | 273,114 | 02 Mar 2026 | Direct | ||
| John R. Desjarlais | XNCR | Stock Option (Right to Buy) | Award | 149,440 | 149,440 | 02 Mar 2026 | Direct | |||
| Bart Jan Cornelissen | XNCR | Common Stock | Award | 31.2% | 19,458 | 81,914 | 02 Mar 2026 | Direct | ||
| Bart Jan Cornelissen | XNCR | Stock Option (Right to Buy) | Award | 116,750 | 116,750 | 02 Mar 2026 | Direct | |||
| Celia Eckert | XNCR | Common Stock | Award | 28.8% | 18,680 | 83,421 | 02 Mar 2026 | Direct | ||
| Celia Eckert | XNCR | Stock Option (Right to Buy) | Award | 112,080 | 112,080 | 02 Mar 2026 | Direct | |||
| Bassil I. Dahiyat | XNCR | Common Stock | Award | 20.4% | 97,291 | 574,550 | 02 Mar 2026 | Direct | ||
| Bassil I. Dahiyat | XNCR | Stock Option (Right to Buy) | Award | 583,748 | 583,748 | 02 Mar 2026 | Direct | |||
| John R. Desjarlais | XNCR | Common Stock | Options Exercise | 2.19% | 5,322 | 248,207 | 23 Jan 2026 | Direct | ||
| John R. Desjarlais | XNCR | Stock Option (Right to Buy) | Options Exercise | -100% | -5,322 | 0 | 23 Jan 2026 | Direct | ||
| John R. Desjarlais | XNCR | Common Stock | Options Exercise | 2.67% | 6,311 | 242,885 | 22 Dec 2025 | Direct | ||
| John R. Desjarlais | XNCR | Stock Option (Right to Buy) | Options Exercise | -54.2% | -6,311 | 5,322 | 22 Dec 2025 | Direct | ||
| Bassil I. Dahiyat | XNCR | Common Stock | Options Exercise | 2.28% | 10,624 | 477,259 | 22 Dec 2025 | Direct | ||
| Bassil I. Dahiyat | XNCR | Stock Option (Right to Buy) | Options Exercise | -100% | -10,624 | 0 | 22 Dec 2025 | Direct | ||
| John R. Desjarlais | XNCR | Common Stock | Sale | -23.7% | $1,153,329 | $15.72 | -73,367 | 236,574 | 19 Dec 2025 | Direct |
| John R. Desjarlais | XNCR | Common Stock | Options Exercise | 31% | 73,367 | 309,941 | 19 Dec 2025 | Direct | ||
| John R. Desjarlais | XNCR | Stock Option (Right to Buy) | Options Exercise | -86.3% | -73,367 | 11,633 | 19 Dec 2025 | Direct | ||
| Bassil I. Dahiyat | XNCR | Common Stock | Sale | -19.7% | $1,796,863 | $15.71 | -114,377 | 466,635 | 19 Dec 2025 | Direct |
| Bassil I. Dahiyat | XNCR | Common Stock | Options Exercise | 24.5% | 114,377 | 581,012 | 19 Dec 2025 | Direct | ||
| Bassil I. Dahiyat | XNCR | Stock Option (Right to Buy) | Options Exercise | -91.5% | -114,377 | 10,624 | 19 Dec 2025 | Direct | ||
| Raymond Joseph Deshaies | XNCR | Stock Option (Right to Buy) | Award | 110,422 | 110,422 | 31 Jul 2025 | Direct |
* marks a reported price that did not pass the local price check.