Who owns DFTX?
Institutional ownership of Definium Therapeutics Inc. from Form 13F, Q2 2026
360 institutional managers reported holding Definium Therapeutics Inc. (DFTX) in Form 13F filings for Q2 2026, with 114,811,682 shares worth $5.3B. The largest reported holder was BlackRock, Inc. Managers that filed both quarters added a net 34,292,761 shares (+45.8%). 143 opened new positions and 30 sold out.
- Funds holding
- 360
- Value held
- $5.3B
- New / sold out
- 143 / 30
- Net shares, same filers
- +45.8%
Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
Largest holders of DFTX
| Fund | Value | Share of 13F holdings | Shares | Move |
|---|---|---|---|---|
| BlackRock, Inc. | $528M | 9.8% | 11,232,834 | Added |
| Avoro Capital Advisors LLC | $338M | 6.3% | 7,188,888 | Added |
| Driehaus Capital Management LLC | $322M | 6.0% | 6,845,276 | Added |
| Jupiter Topco LLC | $264M | 4.9% | 5,615,645 | First report |
| Capital World Investors | $252M | 4.7% | 5,367,723 | New |
| FMR LLC | $224M | 4.1% | 4,752,921 | Added |
| Price T Rowe Associates Inc | $219M | 4.1% | 4,652,032 | Added |
| Geode Capital Management, LLC | $171M | 3.2% | 3,644,813 | Added |
| State Street Corp | $144M | 2.7% | 3,065,390 | Added |
| Capital International Investors | $139M | 2.6% | 2,963,410 | New |
| Octagon Capital Advisors LP | $139M | 2.6% | 2,950,000 | Added |
| Wellington Management Group LLP | $139M | 2.6% | 2,949,734 | Added |
| Deep Track Capital, LP | $129M | 2.4% | 2,750,000 | Trimmed |
| Commodore Capital LP | $94.1M | 1.7% | 2,000,000 | Unchanged |
| Goldman Sachs Group Inc | $84.7M | 1.6% | 1,800,852 | Added |
| Citadel Advisors LLC | $79.4M | 1.5% | 1,688,587 | Added |
| Vanguard Portfolio Management LLC | $77.5M | 1.4% | 1,648,426 | Added |
| Ra Capital Management, L.p. | $70.6M | 1.3% | 1,500,000 | New |
| Vanguard Capital Management LLC | $69.9M | 1.3% | 1,486,454 | Added |
| Siren, L.L.C. | $66.8M | 1.2% | 1,419,493 | Added |
| Marshall Wace, LLP | $61.1M | 1.1% | 1,298,946 | Added |
| Northern Trust Corp | $55.0M | 1.0% | 1,169,238 | Added |
| Ameriprise Financial Inc | $54.0M | 1.0% | 1,148,363 | Added |
| Nuveen, LLC | $52.0M | 1.0% | 1,105,314 | Added |
| Charles Schwab Investment Management Inc | $51.0M | 0.9% | 1,083,576 | Added |
Share of 13F holdings is each fund's shares as a share of the 114,811,682 DFTX shares all 13F filers reported, not of shares outstanding.
Biggest buyers in Q2 2026
- Capital World Investors New+$252M
- Price T Rowe Associates Inc Added+$216M
- Capital International Investors New+$139M
- FMR LLC Added+$138M
- BlackRock, Inc. Added+$129M
- Avoro Capital Advisors LLC Added+$103M
- Wellington Management Group LLP Added+$77.4M
- Ra Capital Management, L.p. New+$70.6M
- Geode Capital Management, LLC Added+$54.1M
- Driehaus Capital Management LLC Added+$43.9M
Biggest sellers in Q2 2026
- ArrowMark Colorado Holdings LLC Trimmed-$48.5M
- Trails Edge Capital Partners, LP Sold out-$32.9M
- Candriam S.C.A. Trimmed-$31.9M
- Millennium Management LLC Trimmed-$27.3M
- Stempoint Capital LP Trimmed-$24.2M
- Catalio Capital Management, LP Trimmed-$22.4M
- Orbimed Advisors LLC Trimmed-$20.6M
- Balyasny Asset Management L.P. Trimmed-$17.7M
- Holocene Advisors, LP Trimmed-$13.9M
- AWM Investment Company, Inc. Trimmed-$13.7M
The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $2.0B and sold $373M; 114 added and 64 trimmed.
Schedule 13D and 13G filings on DFTX
Owners of more than 5% must file within days, so these can be newer than the 13F data.
- 2026-11-05FMR LLC SCHEDULE 13G filed by Definium Therapeutics Inc.Schedule 13G
- 2026-02-17DRIEHAUS CAPITAL MANAGEMENT LLC SCHEDULE 13G filed by Definium Therapeutics Inc.Schedule 13G
- 2026-02-17Avoro Capital Advisors LLC SCHEDULE 13G filed by Definium Therapeutics Inc.Schedule 13G
Questions about DFTX ownership
- Who owns DFTX stock?
- 360 institutional investment managers reported DFTX positions in their Form 13F filings for Q2 2026, holding 114,811,682 shares worth $5.3B in total. BlackRock, Inc. reported the largest position.
- Are funds buying or selling DFTX?
- In Q2 2026, 143 managers opened new DFTX positions, 114 added, 64 trimmed and 30 sold out. Managers that filed in both quarters added a net 34,292,761 shares.
- How current is this DFTX institutional ownership data?
- It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.
From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to DFTX by CUSIP. Options are left out. DFTX news and filings · DFTX insider trades · Top funds