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IONSIONS
8 quarters

Position history for BAKER BROS. ADVISORS LPBAKER BROS. ADVISORS LP's holdings in IONIS PHARMACEUTICALS INC

Yes. Baker Bros. Advisors holds 2,047,727 shares of IONS (Ionis Pharmaceuticals), worth $162.4M, as of its Q2 2026 13F filing. The share count is unchanged from Q1 2026. Baker Bros. Advisors has held IONS since Q3 2025, across 4 quarterly 13F filings. IONS is 0.8% of Baker Bros. Advisors' reported 13F portfolio.

Current Value

$162.4M

Current Shares

2M

Total Value Change

+$153.4M

Total Shares Change

+1.8M

Quarter-by-Quarter History
QuarterActionSharesChangeValueWeightPriceConviction
2026-Q2
Latest
Unchanged
2M
0.0%
$162.4M0.8%$79.29
0
2026-Q1
Increased
2M
+14.3%
$153.8M0.9%$75.09
49
2025-Q4
Increased
1.8M
+216.1%
$141.8M0.8%$79.11
69
2025-Q3
New
566,798
-
$37.1M0.3%$65.42
48
2025-Q2
Exited
0
-100.0%
$00.0%$39.51
0
2025-Q1
Unchanged
357,915
0.0%
$10.8M0.1%$30.17
0
2024-Q4
Increased
357,915
+60.2%
$12.5M0.1%$34.96
48
2024-Q3
New
223,470
-
$9M0.1%$40.06
38

Other major holders of IONS: FMR LLC, Capital World Investors

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