KAILERA THERAPEUTICS INC KLRA
COMMON STOCK · Common Stock · CUSIP 482931102
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersWaltham, MA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Shares outstanding: 129.6m as of 2026-08-06, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $22.03.
Biggest buyers
| Bain Capital Investors LLC | New | +26.3m |
| Bain Capital Life Sciences Investors, LLC | New | +22.6m |
| RTW INVESTMENTS, LP | New | +10.8m |
| CANADA PENSION PLAN INVESTMENT BOARD | New | +7.3m |
| Atlas Venture Life Science Advisors, LLC | New | +5.2m |
| FMR LLC | New | +4.0m |
| BlackRock, Inc. | New | +3.9m |
| PRICE T ROWE ASSOCIATES INC /MD/ | New | +3.5m |
| CITADEL ADVISORS LLC | New | +3.2m |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | New | +3.2m |
Biggest sellers
| None |
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
BCPE Perseus Investor, LP
13D · may seek influence
new · filed 2026-04-23
Stated purposeThe information set forth in Item 3 of this Schedule 13D is incorporated by reference in its entirety into this Item 4. Andrew Kaplan, a Partner of BCI, is a member of the Issuer's board of directors (the "Board"). The Reporting Person acquired the securities reported herein for investment purposes. In its capacity as a significant stockholder of the Issuer, the Reporting Person intends to take an active role in working with the Issuer's management and the Board on operational, financial and strategic initiatives. The Reporting Person reviews and intends to continue to review, on an ongoing and continuing basis, their investment in the Issuer. Depending upon the factors discussed below and subject to applicable law, the Reporting Person may from time to time acquire additional securities… Full filing |
20.3% |
BCLS Fund IV Investments, L.P.
13D · may seek influence
new · filed 2026-04-23
Stated purposeThe information set forth in Item 3 of this Schedule 13D is incorporated by reference in its entirety into this Item 4. Adam Koppel, a Partner of BCLSI, is a member of the Issuer's board of directors (the "Board"). The Reporting Person acquired the securities reported herein for investment purposes. In its capacity as a significant stockholder of the Issuer, the Reporting Person intends to take an active role in working with the Issuer's management and the Board on operational, financial and strategic initiatives. The Reporting Person reviews and intends to continue to review, on an ongoing and continuing basis, their investment in the Issuer. Depending upon the factors discussed below and subject to applicable law, the Reporting Person may from time to time acquire additional securities… Full filing |
17.4% |
| Jiangsu Hengrui Pharmaceuticals Co., Ltd. 13G · exempt (held before listing) new · filed 2026-08-05 | 8.9% |
| RTW INVESTMENTS, LP 13G · institution new · filed 2026-08-14 | 8.3% |
| CANADA PENSION PLAN INVESTMENT BOARD 13G · exempt (held before listing) new · filed 2026-08-14 | 5.6% |
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 2 | $159.4m | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-04-20 | Kaplan Andrew T. Director · See footnotes | Bought | $134.4m8.4m shares |
| 2026-04-20 | BAIN CAPITAL INVESTORS LLC +4 10% owner · See footnotes | Bought | $134.4m8.4m shares |
| 2026-04-20 | Bain Capital Life Sciences Investors, LLC +4 10% owner · See footnotes | Bought | $25.0m1.6m shares |
| 2026-04-20 | Koppel Adam Director · See footnotes | Bought | $25.0m1.6m shares |
| 2026-04-20 | RTW INVESTMENTS, LP +1 10% owner · See footnote | Bought | $8.0m500.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| Bain Capital Investors LLC 12.01% of their portfolio | 26.3m $578.4m | New |
| Bain Capital Life Sciences Investors, LLC 29.58% of their portfolio | 22.6m $497.5m | New |
| RTW INVESTMENTS, LP 2.03% of their portfolio | 10.8m $237.4m | New |
| CANADA PENSION PLAN INVESTMENT BOARD 0.09% of their portfolio | 7.3m $160.9m | New |
| Atlas Venture Life Science Advisors, LLC 12.93% of their portfolio | 5.2m $113.9m | New |
| FMR LLC 0.00% of their portfolio | 4.0m $87.5m | New |
| BlackRock, Inc. 0.00% of their portfolio | 3.9m $86.5m | New |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 3.5m $77.9m | New |
| CITADEL ADVISORS LLC 0.04% of their portfolio | 3.2m $71.4m | New |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.10% of their portfolio | 3.2m $70.7m | New |
| WELLINGTON MANAGEMENT GROUP LLP 0.01% of their portfolio | 2.9m $64.3m | New |
| Royalty Pharma Sub-Manager, LLC 22.36% of their portfolio | 2.5m $54.1m | New |
| Siren, L.L.C. 0.99% of their portfolio | 2.2m $48.8m | New |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.7m $37.3m | New |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 1.7m $36.4m | New |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 1.1m $25.0m | New |
| FARALLON CAPITAL MANAGEMENT, L.L.C. 0.14% of their portfolio | 1.1m $24.2m | Not comparable |
| Frazier Life Sciences Management, L.P. 0.53% of their portfolio | 1.1m $24.2m | New |
| Trails Edge Capital Partners, LP 3.44% of their portfolio | 984.8k $21.7m | New |
| UBS Group AG 0.00% of their portfolio | 972.7k $21.4m | New |
| Jupiter Topco LLC 0.01% of their portfolio | 970.9k $21.3m | First filing |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 821.3k $18.1m | New |
| Deep Track Capital, LP 0.23% of their portfolio | 700.0k $15.4m | New |
| EVENTIDE ASSET MANAGEMENT, LLC 0.18% of their portfolio | 616.7k $13.6m | New |
| Vestal Point Capital, LP 0.30% of their portfolio | 575.0k $12.7m | New |
| Cormorant Asset Management, LP 0.62% of their portfolio | 550.0k $12.1m | New |
| Catalio Capital Management, LP 1.94% of their portfolio | 468.8k $10.3m | New |
| FEDERATED HERMES, INC. 0.01% of their portfolio | 434.1k $9.6m | New |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 421.0k $9.3m | New |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 400.0k $8.8m | New |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 362.9k $8.0m | New |
| NORTHERN TRUST CORP 0.00% of their portfolio | 354.4k $7.8m | New |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 290.1k $6.4m | New |
| Nantahala Capital Management, LLC 0.19% of their portfolio | 280.0k $6.2m | New |
| SEVEN GRAND MANAGERS, LLC 0.16% of their portfolio | 175.0k $3.9m | New |
| Balyasny Asset Management L.P. 0.01% of their portfolio | 154.8k $3.4m | New |
| EXCHANGE TRADED CONCEPTS, LLC 0.02% of their portfolio | 152.5k $3.4m | New |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 149.8k $3.3m | New |
| TD Asset Management Inc 0.00% of their portfolio | 147.7k $3.3m | New |
| a16z Capital Management, L.L.C. 0.02% of their portfolio | 140.0k $3.1m | New |
| Aberdeen Group plc 0.00% of their portfolio | 140.0k $3.1m | New |
| Bank of New York Mellon Corp 0.00% of their portfolio | 138.4k $3.0m | New |
| ALPS ADVISORS INC 0.01% of their portfolio | 131.0k $2.9m | New |
| Nuveen, LLC 0.00% of their portfolio | 88.8k $2.0m | New |
| Avidity Partners Management LP 0.28% of their portfolio | 80.0k $1.8m | New |
| Ghisallo Capital Management LLC 0.03% of their portfolio | 75.0k $1.7m | New |
| Rock Springs Capital Management LP 0.07% of their portfolio | 65.0k $1.4m | New |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 61.1k $1.3m | New |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 58.4k $1.3m | New |
| MORGAN STANLEY 0.00% of their portfolio | 57.8k $1.3m | New |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 56.5k $1.2m | New |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 53.3k $1.2m | New |
| XTX Topco Ltd 0.01% of their portfolio | 49.2k $1.1m | New |
| LAZARD ASSET MANAGEMENT LLC 0.00% of their portfolio | 48.4k $1.1m | New |
| TUDOR INVESTMENT CORP ET AL 0.00% of their portfolio | 48.0k $1.1m | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 45.6k $1.0m | New |
| Squarepoint Ops LLC 0.00% of their portfolio | 45.1k $992.7k | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 43.1k $949.9k | New |
| Foresite Capital Management VI LLC 0.13% of their portfolio | 37.5k $826.1k | New |
| CIBC WORLD MARKET INC. 0.00% of their portfolio | 35.5k $781.5k | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 32.6k $718.4k | New |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 31.3k $723.9k | New |
| Invesco Ltd. 0.00% of their portfolio | 28.4k $625.4k | New |
| MetLife Investment Management, LLC 0.00% of their portfolio | 27.3k $602.0k | New |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.00% of their portfolio | 23.0k $505.6k | New |
| CITIGROUP INC 0.00% of their portfolio | 21.5k $474.7k | New |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 21.2k $466.4k | New |
| SOROS FUND MANAGEMENT LLC 0.01% of their portfolio | 20.0k $440.6k | New |
| Quadrature Capital Ltd 0.00% of their portfolio | 19.2k $423.0k | New |
| D. E. Shaw & Co., Inc. 0.00% of their portfolio | 17.5k $385.5k | New |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 17.4k $383.9k | New |
| Harbour Capital Advisors, LLC 0.06% of their portfolio | 16.6k $342.7k | New |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 16.2k $356.9k | New |
| Tidal Investments LLC 0.00% of their portfolio | 14.0k $309.3k | New |
| Tema ETFs LLC 0.01% of their portfolio | 14.0k $309.3k | First filing |
| Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio | 13.6k $300.0k | New |
| BARCLAYS PLC 0.00% of their portfolio | 10.3k $227.6k | New |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 10.3k $227.0k | New |
| Hudson Bay Capital Management LP 0.00% of their portfolio | 10.1k $221.4k | New |
| GABELLI FUNDS LLC 0.00% of their portfolio | 10.0k $220.3k | New |
| Legal & General Group Plc 0.00% of their portfolio | 9.0k $199.2k | New |
| STRS OHIO 0.00% of their portfolio | 9.0k $198.3k | New |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 7.0k $154.2k | New |
| US BANCORP \DE\ 0.00% of their portfolio | 5.0k $110.4k | New |
| Penserra Capital Management LLC 0.00% of their portfolio | 4.9k $107.0k | New |
| Ameritas Investment Partners, Inc. 0.00% of their portfolio | 4.2k $92.3k | New |
| DIADEMA PARTNERS LP 0.03% of their portfolio | 3.6k $79.8k | New |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 3.3k $72.5k | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 2.9k $65.0k | New |
| PNC Financial Services Group, Inc. 0.00% of their portfolio | 2.6k $58.2k | New |
| Persistent Asset Partners Ltd 0.01% of their portfolio | 1.8k $38.9k | New |
| Federation des caisses Desjardins du Quebec 0.00% of their portfolio | 1.1k $25.3k | New |
| NISA INVESTMENT ADVISORS, LLC 0.00% of their portfolio | 871 $19.2k | New |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 636 $14.0k | New |
| Sterling Capital Management LLC 0.00% of their portfolio | 402 $8.9k | New |
| Fortitude Family Office, LLC 0.00% of their portfolio | 32 $705 | New |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 20 $441 | New |
| JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio | 15 $312 | New |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 1 $22 | New |