IONS
Ionis Pharmaceut (IONS)
NASDAQ
$43.93+$0.02 (+0.05%)
Price as of Oct 23, 2026 6:05 AM EDT
  • $7.3B
    Market Cap
  • -38.59%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
DLD ASSET MANAGEMENT, LP
15.04%
25.0M
+25.0M (+100.00%)
Sep 30, 2025
FMR LLC
14.82%
24.6M
+75,319 (+0.31%)
Jun 30, 2026
CAPITAL WORLD INVESTORS
13.04%
21.7M
+482,857 (+2.23%)
Jun 30, 2026
VANGUARD GROUP INC
9.89%
16.4M
-41,271 (-0.25%)
Dec 31, 2025
BLACKROCK FUNDING, INC. /DE
7.02%
11.7M
+852,525 (+7.31%)
Dec 31, 2024
BLACKROCK, INC.
6.44%
10.7M
+262,184 (+2.45%)
Jun 30, 2026
BLACKROCK INC.
6.21%
10.3M
+549,139 (+5.32%)
Jun 30, 2024

Current Ownership Distribution

  • Institutions2.9B (58.50%)
  • Mutual Funds2.0B (41.47%)
  • Insiders1.6M (0.03%)
  • Other0 (0.00%)

Insider Transactions

  • 0.03% (1.6M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 16
    Number of InsiderSelling (last 12 months)
  • $357.5M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Devers Shannon L.
EVP, Chief Human Resources Ofc
Sell
Oct 16, 2026
$59,081.88
1,357
$43.54
17,811
Swayze Eric
EVP Research
Sell
Oct 16, 2026
$2,307.56
53
$43.54
390
Devers Shannon L.
EVP, Chief Human Resources Ofc
Exempt
Oct 15, 2026
$0.00
2,820
$0.00
49,884
Swayze Eric
EVP Research
Exempt
Oct 15, 2026
$0.00
125
$0.00
486
Devers Shannon L.
EVP, Chief Human Resources Ofc
Exempt
Oct 15, 2026
$0.00
2,820
$0.00
19,168
Swayze Eric
EVP Research
Exempt
Oct 15, 2026
$0.00
125
$0.00
443
Monia Brett P
Chief Executive Officer
Other
Aug 31, 2026
$5,027.99
98
$51.31
242,760
BENNETT C FRANK
EVP, Chief Scientific Officer
Other
Aug 31, 2026
$5,643.66
110
$51.31
60,128
O'NEIL PATRICK R.
EVP CLO & General Counsel
Other
Aug 31, 2026
$3,232.28
63
$51.31
59,205
HANTSON LUDWIG
Award
Jul 15, 2026
$0.00
3,399
$0.00
3,399
BERTHELSEN SPENCER R
Exempt
Jul 15, 2026
$0.00
5,220
$0.00
2,301
Reikes Peter N
Award
Jul 15, 2026
$0.00
3,399
$0.00
3,399
HERMAN JOAN E
Exempt
Jul 15, 2026
$0.00
5,220
$0.00
2,301
BERTHELSEN SPENCER R
Exempt
Jul 15, 2026
$0.00
5,220
$0.00
161,233
HERMAN JOAN E
Exempt
Jul 15, 2026
$0.00
5,220
$0.00
51,306
Kordasiewicz Holly B.
EVP, Chief Development Officer
Sell
Jul 07, 2026
$30,516.60
362
$84.30
22,096
Hayden Michael R
Award
Jul 01, 2026
$0.00
5,369
$0.00
5,369
LOSCALZO JOSEPH
Award
Jul 01, 2026
$0.00
5,369
$0.00
5,369
Hayden Michael R
Award
Jul 01, 2026
$0.00
2,301
$0.00
12,198
YANG MICHAEL J.
Award
Jul 01, 2026
$0.00
5,369
$0.00
5,369
Diaz Allene M.
Award
Jul 01, 2026
$0.00
5,369
$0.00
5,369
YANG MICHAEL J.
Award
Jul 01, 2026
$0.00
2,301
$0.00
9,451
LOSCALZO JOSEPH
Award
Jul 01, 2026
$0.00
2,301
$0.00
7,521
Diaz Allene M.
Award
Jul 01, 2026
$0.00
2,301
$0.00
7,521
O'NEIL PATRICK R.
EVP CLO & General Counsel
Sell
Jun 26, 2026
$245,520.00
3,069
$80.00
61,470
Baroldi Joseph
EVP, Chief Business Officer
Exempt
Jun 26, 2026
$0.00
1,769
$0.00
0
Schneider Eugene
EVP, Chf Clinical Develop Ofcr
Exempt
Jun 26, 2026
$0.00
26,000
$0.00
26,000
Baroldi Joseph
EVP, Chief Business Officer
Exempt
Jun 26, 2026
$0.00
3,866
$0.00
0
Schneider Eugene
EVP, Chf Clinical Develop Ofcr
Exempt
Jun 26, 2026
$1.6M
26,000
$60.89
103,114
Baroldi Joseph
EVP, Chief Business Officer
Exempt
Jun 26, 2026
$219,511.48
3,866
$56.78
8,535