Does Baker Bros. Advisors own ALKS stock?

Yes. As of its Q2 2026 13F, Baker Bros. Advisors holds 10,012,267 shares of ALKS (Alkermes), worth $524.6M.

How many shares of ALKS does Baker Bros. Advisors own?

As of its Q2 2026 13F, Baker Bros. Advisors holds 10,012,267 shares of ALKS (Alkermes).

As of its Q2 2026 13F, Baker Bros. Advisors' ALKS position is worth $524.6M.

Baker Bros. Advisors already held ALKS in its Q1 2019 13F, the earliest on record, and has listed it in 24 quarterly 13F filings.

Position history for BAKER BROS. ADVISORS LP's holdings in ALKERMES PLC

Current Value

$524.6M

Current Shares

10M

Total Value Change

+$522.1M

Total Shares Change

+9.9M

Quarter-by-Quarter History

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Unchanged	10M	0.0%	$524.6M	2.6%	$52.40	0
2026-Q1	Unchanged	10M	0.0%	$354M	2.0%	$29.20	0
2025-Q4	Increased	10M	+23.7%	$280.1M	1.6%	$27.98	59
2025-Q3	Increased	8.1M	+26.2%	$242.7M	1.8%	$30.00	60
2025-Q2	Increased	6.4M	+43.0%	$183.4M	1.8%	$28.81	65
2025-Q1	Increased	4.5M	+7.2%	$148M	1.6%	$33.21	51
2024-Q4	Unchanged	4.2M	0.0%	$120.3M	1.3%	$28.78	0
2024-Q3	Unchanged	4.2M	0.0%	$117M	1.2%	$27.99	0
2024-Q2	New	4.2M	-	$100.8M	1.3%	$24.10	68
2022-Q4	Exited	0	-100.0%	$0	0.0%	$26.13	0
2022-Q3	Decreased	815,016	-45.7%	$18.2M	0.1%	$22.33	0
2022-Q2	Unchanged	1.5M	0.0%	$44.7M	0.3%	$29.79	0
2022-Q1	Unchanged	1.5M	0.0%	$39.5M	0.2%	$26.31	0
2021-Q4	Increased	1.5M	+22.1%	$34.9M	0.2%	$23.26	42
2021-Q3	Unchanged	1.2M	0.0%	$37.9M	0.2%	$30.84	0
2021-Q2	Unchanged	1.2M	0.0%	$30.1M	0.1%	$24.52	0
2021-Q1	Decreased	1.2M	-20.0%	$22.9M	0.1%	$18.68	0
2020-Q4	Increased	1.5M	+13.0%	$30.6M	0.1%	$19.95	39
2020-Q3	Increased	1.4M	+9.2%	$22.5M	0.1%	$16.57	31
2020-Q2	Unchanged	1.2M	0.0%	$24.2M	0.1%	$19.41	0
2020-Q1	Increased	1.2M	+56.9%	$17.9M	0.1%	$14.42	48
2019-Q4	Increased	793,130	+26.9%	$16.2M	0.1%	$20.40	35
2019-Q3	Increased	625,030	+56.3%	$12.2M	0.1%	$19.51	40
2019-Q2	Increased	400,000	+497.0%	$9M	0.1%	$22.54	44
2019-Q1	First report	67,000	-	$2.4M	0.0%	$36.49	0