Which funds own IONS
Ionis Pharmaceuticals Inc in the Q2 2026 filings. At least 8 of the 91 current managers on file reported a position, worth $5.1bn between them. It is among the largest positions of fewer than a fifth of the current managers on file. The quarter went one way: 7 managers opened or added against 3 cutting.
- Managers holding
- 8
- at least, of 91 current
- Combined value
- $5.1bn
- as reported
- Opened
- 1
- new this quarter
- Added to
- 6
- already held
- Trimmed or sold out
- 3
- 2 sold out entirely
Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.
Managers reporting a position
Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.
| Manager | Value | Weight | Shares | Change on the quarter | Action |
|---|---|---|---|---|---|
| Fidelity (FMR LLC) Long-only · $2304bn book | $2.0bn | 0.1% | 24,631,956 | +$109m+75,319 | Added |
| Capital World Investors Long-only · $846bn book | $1.7bn | 0.2% | 21,669,226 | +$127m+482,857 | Added |
| Wellington Management Group LLP Long-only · $580bn book | $607m | 0.1% | 7,651,415 | +$127m+1,259,599 | Added |
| Two Sigma Investments LP Quantitative · $138bn book | $496m | 0.4% | 6,252,342 | +$56m+394,713 | Added |
| Artisan Partners LP Long-only · $63.1bn book | $209m | 0.3% | 2,640,024 | +$55m+581,716 | Added |
| Voloridge Investment Management LLC Quantitative · $23.5bn book | $52m | 0.2% | 655,454 | +$1.4m-17,404 | Trimmed |
| Freestone Grove Partners LP Multi-strategy · $15.6bn book | $27m | 0.2% | 339,967 | opened339,967 | New |
| ARK Investment Management LLC Long-only · $15.4bn book | $24m | 0.2% | 300,770 | +$2.2m+12,054 | Added |
Sold out of this quarter
Valued at what the position was worth in the previous filing, because by this one it is gone.
- Winton Group Ltd · Quantitative$8.0m held before
- Farallon Capital Management LLC · Long/short equity$400k held before
Ownership through time
At least 14 of the 95 managers whose filings are on file listed IONS in Q2 2026, against 14 in Q4 2015. 2 managers fewer than in Q1 2026: 1 started a position; 2 listed it again; 2 sold out, by their own filings; 3 no longer listed it among the positions read, which can mean a holding below the listed range, a filing that reported no holdings, or a filing not yet made.
Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.
- Q4 2015: 14
- Q1 2016: 7
- Q2 2016: 3
- Q3 2016: 4
- Q4 2016: 7
- Q1 2017: 5
- Q2 2017: 6
- Q3 2017: 6
- Q4 2017: 7
- Q1 2018: 7
- Q2 2018: 6
- Q3 2018: 8
- Q4 2018: 11
- Q1 2019: 14
- Q2 2019: 11
- Q3 2019: 10
- Q4 2019: 10
- Q1 2020: 14
- Q2 2020: 12
- Q3 2020: 15
- Q4 2020: 14
- Q1 2021: 9
- Q2 2021: 10
- Q3 2021: 8
- Q4 2021: 9
- Q1 2022: 9
- Q2 2022: 12
- Q3 2022: 11
- Q4 2022: 9
- Q1 2023: 7
- Q2 2023: 10
- Q3 2023: 12
- Q4 2023: 14
- Q1 2024: 15
- Q2 2024: 17
- Q3 2024: 16
- Q4 2024: 11
- Q1 2025: 10
- Q2 2025: 13
- Q3 2025: 18
- Q4 2025: 15
- Q1 2026: 16
- Q2 2026: 14
- Q4 2015: $1.8bn
- Q1 2016: $1.1bn
- Q2 2016: $667m
- Q3 2016: $1.1bn
- Q4 2016: $1.6bn
- Q1 2017: $1.4bn
- Q2 2017: $1.9bn
- Q3 2017: $1.9bn
- Q4 2017: $1.9bn
- Q1 2018: $1.6bn
- Q2 2018: $1.6bn
- Q3 2018: $2.1bn
- Q4 2018: $2.1bn
- Q1 2019: $3.5bn
- Q2 2019: $2.8bn
- Q3 2019: $2.6bn
- Q4 2019: $2.5bn
- Q1 2020: $2.1bn
- Q2 2020: $2.6bn
- Q3 2020: $2.1bn
- Q4 2020: $2.5bn
- Q1 2021: $1.9bn
- Q2 2021: $1.8bn
- Q3 2021: $1.4bn
- Q4 2021: $1.3bn
- Q1 2022: $1.6bn
- Q2 2022: $1.6bn
- Q3 2022: $1.5bn
- Q4 2022: $1.2bn
- Q1 2023: $1.0bn
- Q2 2023: $1.3bn
- Q3 2023: $1.4bn
- Q4 2023: $1.9bn
- Q1 2024: $1.7bn
- Q2 2024: $2.1bn
- Q3 2024: $2.1bn
- Q4 2024: $1.7bn
- Q1 2025: $1.5bn
- Q2 2025: $2.1bn
- Q3 2025: $3.6bn
- Q4 2025: $4.9bn
- Q1 2026: $5.0bn
- Q2 2026: $5.5bn
Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.
Started in Q2 2026
Largest increases, by shares
- Wellington Management Group LLP6,391,816 to 7,651,415 shares+$100m
- Artisan Partners LP2,058,308 to 2,640,024 shares+$46m
- Capital World Investors21,186,369 to 21,669,226 shares+$38m
- Two Sigma Investments LP5,857,629 to 6,252,342 shares+$31m
- Freestone Grove Partners LPnew: 339,967 shares+$27m
Largest decreases, by shares
- Hudson Bay Capital Management LP295,100 to 145,000 shares-$12m
- Voloridge Investment Management LLC672,858 to 655,454 shares-$1.4m
- MFS Investment Management666,116 to 651,816 shares-$1.1m
Left it
- Winton Group Ltdwas $8.0m
- Farallon Capital Management LLCwas $360k
What IONS is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around IONS →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
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