13D·WATCH Activist + Insider Intelligence Live feed Blog About Pricing
SCHEDULE 13D Filed 2026-11-06 Event 2026-10-30 SEC 0001346824-26-000253 →

RA CAPITAL MANAGEMENT, L.P. → Bambusa Therapeutics, Inc. BBTX

Stake: 14.60% Shares: 7,429,758 CUSIP: 058937103 Class: Common Stock, par value $0.001 per share
Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 14/100 · Filer 90d Win Rate: 0% · Hist. 90d Edge: +0.0%
  • Filer track record (20 filings): 0% 90d win rate, +0.0% 90d edge
  • High conviction ownership stake (14.6%)

Item 4 — Purpose of Transaction

The Reporting Persons acquired the common stock reported herein for investment purposes and not with an intent, purpose or effect of changing control of the Issuer. The Reporting Persons may, from time to time, acquire additional equity securities or debt securities of the Issuer, which debt securities may be convertible or non-convertible, secured or unsecured, and could involve the monetization of potential revenue streams deriving from development-stage or commercial programs of the Issuer, or dispose of Issuer securities they beneficially own, on the open market or in private transactions or otherwise (including by means of 10b5-1 programs), consistent with their investment purposes and in amounts, on such terms and at such times as to be determined by the Reporting Persons based upon a number of factors, including, without limitation, their ongoing assessment of the Issuer's business prospects, the availability of Issuer securities at prices that would make the purchase or sale of such securities desirable, prevailing market conditions, the availability of other investment opportunities, and/or other considerations. In addition, consistent with their investment purpose, the Reporting Persons may engage in communications with persons associated with the Issuer, including stockholders of the Issuer, officers of the Issuer, members of the board of directors of the Issuer, and/or or other third parties, to discuss matters regarding the Issuer, including but not limited to its operations, strategic direction, governance or capitalization, and potential business combinations or dispositions involving the Issuer or certain of its businesses. Dr. Derek DiRocco, a Partner of RA Capital, currently serves as a director of the Issuer and therefore will engage in regular discussions with the Issuer's board of directors and management as part of his duties as a director. Neither Dr. DiRocco (other than in his capacity as a director) nor the Reporting Persons have any present plans or proposals that relate to, or could result in, any of the matters referred to in paragraphs (a) through (j), inclusive, of the instructions to Item 4 of Schedule 13D. Depending on various factors including, without limitation, the Issuer's financial position, results and strategic direction, actions taken by the Issuer's management and Board, other investment opportunities available to RA Capital, the price levels of the Issuer securities, conditions in the securities markets and general economic and industry conditions, the Reporting Persons may change their purpose and formulate and implement plans or proposals with respect to the Issuer at any time and from time to time. Any such action may be made by the Reporting Persons alone or in conjunction with other stockholders, potential acquirers, financing sources and/or other third parties and could include one or more purposes, plans or proposals that relate to or would result in actions required to be reported herein in accordance with Item 4 of Schedule 13D.

Cross-References

Insider Activity (last 365d)
0 transactions
0 buys · 0 sales · 0 awards/exercises
Issuer Cluster
2 13D/G filings on this issuer
1 other filing besides this one
Filer Track Record
91 filings by this filer
90 other filings in the data moat
Short Interest
—
Not in latest FINRA snapshot

Other 13D/G Filings on Bambusa Therapeutics, Inc.

FiledFormFilerStakeShares
2026-11-05 SCHEDULE 13G ATHOS KG — — view →

Other Filings by RA CAPITAL MANAGEMENT, L.P.

FiledFormIssuerStakeShares
2026-11-06 SCHEDULE 13D/A SOLID BIOSCIENCES INC. — 12,036,126 view →
2026-11-02 SCHEDULE 13D/A LENZ THERAPEUTICS, INC. — 70,533 view →
2026-10-26 SCHEDULE 13G Alector, Inc. — — view →
2026-10-22 SCHEDULE 13G Frazier Life Sciences Acquisition Corp. II — — view →
2026-09-22 SCHEDULE 13G BetterLife Pharma Inc. — — view →
2026-09-21 SCHEDULE 13D/A SIONNA THERAPEUTICS, INC. 14.30% 6,476,193 view →
2026-09-17 SCHEDULE 13D/A TYRA BIOSCIENCES, INC. — 14,130,492 view →
2026-09-03 SCHEDULE 13G JATT III Acquisition Corp — — view →
2026-08-17 SCHEDULE 13G Latigo Biotherapeutics, Inc. — — view →
2026-08-14 SCHEDULE 13D/A SEPTERNA, INC. — 5,525,324 view →
2026-08-11 SCHEDULE 13D/A Wave Life Sciences, Inc. — 34,314,406 view →
2026-08-10 SCHEDULE 13D/A SAB Biotherapeutics, Inc. — 9,609,852 view →
2026-07-23 SCHEDULE 13D/A ARTIVA BIOTHERAPEUTICS, INC. — 18,415,956 view →
2026-07-22 SCHEDULE 13D/A Freenome, Inc. — 15,367,270 view →
2026-07-21 SCHEDULE 13D/A VOR BIOPHARMA INC. — 12,937,855 view →
2026-07-20 SCHEDULE 13G Agenus Inc. — — view →
2026-07-07 SCHEDULE 13D/A Climb Bio, Inc. CLYM 33.00% 23,249,186 view →
2026-07-02 SCHEDULE 13D/A WEREWOLF THERAPEUTICS, INC. HOWL 4.10% 1,985,541 view →
2026-06-26 SCHEDULE 13D/A WEREWOLF THERAPEUTICS, INC. HOWL 6.00% 2,915,742 view →
2026-06-24 SCHEDULE 13D/A SOLID BIOSCIENCES INC. SLDB — 12,036,126 view →
Showing 20 of 90

Want this depth on every filing the moment it hits SEC EDGAR?

Free $0 (48h-delayed alerts) · Individual $49/mo (real-time) · Team & API $199/mo · Enterprise.

See pricing →