Comparable stake leader
BlackRock, Inc.
SEC ownership of Alkermes plc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001520262.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
31 Mar 2026
- Public ticker
- ALKS on Nasdaq
- Parsed ownership sources
-
13F and 13D/G
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
- 0001520262
- Issuer location
- Dublin 4, Ireland
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 Alkermes plc. (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
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%
BAKER BROS. ADVISORS LP
6.1%
VANGUARD PORTFOLIO MANAGEMENT LLC
5.8%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
STATE STREET CORP
5.2%
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
|
$1,001,197,538
28,314,410 shares
|
— | 31 Mar 2026 |
| BAKER BROS. ADVISORS LP |
13F
13D/G
Company
|
6.1%
from 13D/G
|
$354,033,761
10,012,267 shares
|
— | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
5.8%
|
$341,119,900
9,647,056 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.2%
|
$306,814,760
8,676,888 shares
|
$0 | 31 Mar 2026 |
| STATE STREET CORP |
13F
13D/G
Company · STATE STREET CORPORATION
|
5.2%
from 13D/G
|
$334,692,513
9,465,286 shares
|
— | 31 Mar 2026 |
| WELLINGTON MANAGEMENT GROUP LLP |
13D/G
13F
Company
|
4.3%
|
$201,749,136
7,012,483 shares
|
$0 | 31 Dec 2024 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
13D/G
Company · T. Rowe Price Associates, Inc.
|
2.8%
from 13D/G
|
$164,940,000
4,664,576 shares
|
— | 31 Mar 2026 |
| RENAISSANCE TECHNOLOGIES LLC |
13F
Company
|
3.7%
|
$217,832,734
6,160,428 shares
|
— | 31 Mar 2026 |
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: -$6,237,151.
Buys
$0
Insiders: 0
Sells
$6,237,151
Insiders: 6
Net
-$6,237,151
Shares: -182,225
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 182,225
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 51,319 | $0 | $1,997,823 | -$1,997,823 |
| 3-6 | 0 | 105,158 | $0 | $3,452,463 | -$3,452,463 |
| 6-9 | 0 | 25,748 | $0 | $786,865 | -$786,865 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 24 reporting-owner rows connected to Alkermes plc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
24
Largest Forms 3/4/5 holder
Richard F. Pops
Net 12M change
-$6,237,151
Latest report
12 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Richard F. Pops | Director and CEO, Alkermes plc, Director | $46,223,176 | Mixed | 02 Mar 2026 | ||
| Michael J. Landine | SVP, Corp Dev., Alkermes, Inc. | $10,080,520 | Mixed | 23 Feb 2024 | ||
| David Joseph Gaffin | EVP, CLO, Alkermes, Inc. | $9,881,008 | -$345,516 | -3.4% | Filing P/S | 04 Jun 2026 |
| Blair C. Jackson | EVP, Chief Operating Officer | $7,415,394 | Mixed | 02 Mar 2026 | ||
| Iain M. Brown | SVP, Chief Financial Officer | $5,156,480 | Mixed | 26 Feb 2025 | ||
| Shane Cooke | Director | $3,772,169 | -$2,115,673 | -36% | Median | 20 May 2026 |
| Christian Todd Nichols | SVP, Chief Commercial Officer | $3,293,070 | -$180,000 | -5.2% | Filing P/S | 02 Mar 2026 |
| Craig C. Hopkinson | EVP R&D, Chief Medical Officer | $3,224,915 | -$2,616,947 | -45% | Filing P/S | 01 Jun 2026 |
| David Angelo Daglio Jr. | Director | $3,134,852 | Mixed | 29 Jun 2024 | ||
| Brian P. McKeon | Director | $2,253,586 | Mixed | 20 May 2026 | ||
| David W. Anstice | Director | $2,195,643 | Mixed | 14 Jun 2022 | ||
| Nancy Lynn Snyderman MD | Director | $1,816,607 | Mixed | 20 May 2026 | ||
| Frank Anders Wilson | Director | $1,801,509 | Mixed | 20 May 2026 | ||
| Richard Gaynor | Director | $1,801,509 | Mixed | 20 May 2026 | ||
| Cato T. Laurencin | Director | $1,731,425 | Mixed | 20 May 2026 | ||
| Wendy L. Dixon | Director | $1,373,787 | Mixed | 14 Jun 2022 | ||
| Nancy Wysenski | Director | $1,208,200 | Mixed | 07 Jul 2023 | ||
| Emily Peterson Alva | Director | $1,195,332 | Mixed | 29 Jun 2024 | ||
| Nancy Lurker | Director | $1,181,683 | Mixed | 20 May 2026 | ||
| Christopher I. Wright | Director | $1,158,168 | -$90,200 | -7.2% | Filing P/S | 12 Jun 2026 |
Recent insider transactions for Alkermes plc.
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Christopher I. Wright | ALKS | Ordinary Shares | Sale | -7.23% | $90,200 | $45.10 | -2,000 | 25,680 | 12 Jun 2026 | Direct |
| David Joseph Gaffin | ALKS | Ordinary Shares | Sale | -0.88% | $87,564 | $43.05 | -2,034 | 229,524 | 04 Jun 2026 | Direct |
| Craig C. Hopkinson | ALKS | Ordinary Shares | Sale | -10.4% | $375,044 | $41.67 | -9,000 | 77,389 | 01 Jun 2026 | Direct |
| Craig C. Hopkinson | ALKS | Ordinary Shares | Options Exercise | 6.14% | 5,000 | 86,389 | 01 Jun 2026 | Direct | ||
| Craig C. Hopkinson | ALKS | Employee Stock Option (Right to Buy) | Options Exercise | -44% | -5,000 | 6,356 | 01 Jun 2026 | Direct | ||
| Samuel Joseph Parisi | ALKS | Ordinary Shares | Sale | -67.8% | $687,007 | $42.36 | -16,217 | 7,717 | 29 May 2026 | Direct |
| Samuel Joseph Parisi | ALKS | Ordinary Shares | Options Exercise | 210.2% | 16,217 | 23,934 | 29 May 2026 | Direct | ||
| Samuel Joseph Parisi | ALKS | Employee Stock Option (Right to Buy) | Options Exercise | -82.7% | -16,217 | 3,394 | 29 May 2026 | Direct | ||
| Christopher I. Wright | ALKS | Ordinary Shares | Tax liability | -5.06% | -1,475 | 27,680 | 21 May 2026 | Direct | ||
| Christopher I. Wright | ALKS | Ordinary Shares | Options Exercise | 26.7% | 6,142 | 29,155 | 21 May 2026 | Direct | ||
| Christopher I. Wright | ALKS | Restricted Stock Unit Award | Options Exercise | -100% | -6,142 | 0 | 21 May 2026 | Direct | ||
| Frank Anders Wilson | ALKS | Ordinary Shares | Tax liability | -3.96% | -1,475 | 35,751 | 21 May 2026 | Direct | ||
| Frank Anders Wilson | ALKS | Ordinary Shares | Options Exercise | 19.8% | 6,142 | 37,226 | 21 May 2026 | Direct | ||
| Frank Anders Wilson | ALKS | Restricted Stock Unit Award | Options Exercise | -100% | -6,142 | 0 | 21 May 2026 | Direct | ||
| Nancy Lynn Snyderman MD | ALKS | Ordinary Shares | Tax liability | -8.74% | -1,475 | 15,395 | 21 May 2026 | Direct | ||
| Nancy Lynn Snyderman MD | ALKS | Ordinary Shares | Options Exercise | 57.2% | 6,142 | 16,870 | 21 May 2026 | Direct | ||
| Nancy Lynn Snyderman MD | ALKS | Restricted Stock Unit Award | Options Exercise | -100% | -6,142 | 0 | 21 May 2026 | Direct | ||
| Brian P. McKeon | ALKS | Ordinary Shares | Tax liability | -3.69% | -1,475 | 38,536 | 21 May 2026 | Direct | ||
| Brian P. McKeon | ALKS | Ordinary Shares | Options Exercise | 18.1% | 6,142 | 40,011 | 21 May 2026 | Direct | ||
| Brian P. McKeon | ALKS | Restricted Stock Unit Award | Options Exercise | -100% | -6,142 | 0 | 21 May 2026 | Direct | ||
| Nancy Lurker | ALKS | Ordinary Shares | Tax liability | -7.49% | -1,475 | 18,222 | 21 May 2026 | Direct | ||
| Nancy Lurker | ALKS | Ordinary Shares | Options Exercise | 45.3% | 6,142 | 19,697 | 21 May 2026 | Direct | ||
| Nancy Lurker | ALKS | Restricted Stock Unit Award | Options Exercise | -100% | -6,142 | 0 | 21 May 2026 | Direct | ||
| Cato T. Laurencin | ALKS | Ordinary Shares | Tax liability | -4.19% | -1,475 | 33,769 | 21 May 2026 | Direct | ||
| Cato T. Laurencin | ALKS | Ordinary Shares | Options Exercise | 21.1% | 6,142 | 35,244 | 21 May 2026 | Direct | ||
| Cato T. Laurencin | ALKS | Restricted Stock Unit Award | Options Exercise | -100% | -6,142 | 0 | 21 May 2026 | Direct | ||
| Christopher I. Wright | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Christopher I. Wright | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| Frank Anders Wilson | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Frank Anders Wilson | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| Nancy Lynn Snyderman MD | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Nancy Lynn Snyderman MD | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| Brian P. McKeon | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Brian P. McKeon | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| Nancy Lurker | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Nancy Lurker | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| Cato T. Laurencin | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Cato T. Laurencin | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| Richard Gaynor | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Richard Gaynor | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| Shane Cooke | ALKS | Restricted Stock Unit Award | Award | 5,409 | 5,409 | 20 May 2026 | Direct | |||
| Shane Cooke | ALKS | Non Qualified Stock Option (Right to Buy) | Award | 11,538 | 11,538 | 20 May 2026 | Direct | |||
| David Joseph Gaffin | ALKS | Ordinary Shares | Sale | -0.87% | $67,529 | $33.20 | -2,034 | 231,558 | 04 May 2026 | Direct |
| Craig C. Hopkinson | ALKS | Ordinary Shares | Sale | -9.96% | $300,560 | $33.40 | -9,000 | 81,389 | 01 May 2026 | Direct |
| Craig C. Hopkinson | ALKS | Ordinary Shares | Options Exercise | 5.86% | 5,000 | 90,389 | 01 May 2026 | Direct | ||
| Craig C. Hopkinson | ALKS | Employee Stock Option (Right to Buy) | Options Exercise | -30.6% | -5,000 | 11,356 | 01 May 2026 | Direct | ||
| Nancy Lurker | ALKS | Ordinary Shares | Tax liability | -6.23% | -901 | 13,555 | 11 Apr 2026 | Direct | ||
| Nancy Lurker | ALKS | Ordinary Shares | Options Exercise | 35% | 3,751 | 14,456 | 11 Apr 2026 | Direct | ||
| Nancy Lurker | ALKS | Restricted Stock Unit Award | Options Exercise | -50% | -3,751 | 3,752 | 11 Apr 2026 | Direct | ||
| David Joseph Gaffin | ALKS | Ordinary Shares | Sale | -0.86% | $70,315 | $34.57 | -2,034 | 233,592 | 06 Apr 2026 | Direct |
* marks a reported price that did not pass the local price check.