Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 09, 2021



Caribou Biosciences, Inc.

(Exact name of Registrant as Specified in Its Charter)






(State or Other Jurisdiction
of Incorporation)

(Commission File Number)

(IRS Employer
Identification No.)






2929 7th Street, Suite 105


Berkeley, California



(Address of Principal Executive Offices)


(Zip Code)


Registrant’s Telephone Number, Including Area Code: (510)) 982-6030



(Former Name or Former Address, if Changed Since Last Report)


Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class




Name of each exchange on which registered

Common Stock, $0.0001 par value per share




NASDAQ Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.






Item 2.02 Results of Operations and Financial Condition.

On November 9, 2021, Caribou Biosciences, Inc., a Delaware corporation (the “Company”), issued a press release announcing the Company’s financial results for the quarter ended September 30, 2021. A copy of this press release is furnished as Exhibit 99.1 and is incorporated herein by reference.


The information in this Current Report on Form 8-K (including Exhibit 99.1 attached hereto) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing by the Company, under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934 as amended, except as expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.





Press Release Issued by Caribou Biosciences, Inc. on November 9, 2021



Cover Page Interactive Data File (embedded within the Inline XBRL document)







Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.




Caribou Biosciences, Inc.






November 9, 2021


 /s/ Rachel E. Haurwitz




Rachel E. Haurwitz
President and Chief Executive Officer





Exhibit 99.1


Caribou Biosciences Provides Business Update and Reports Third Quarter 2021 Financial Results


On track to achieve key milestones, including plan to disclose initial clinical data in 2022 for lead product candidate CB-010


Expanded leadership with appointments of Ran Zheng and

Dara Richardson-Heron, M.D., to board of directors and

Ruhi Khan as chief business officer


Ended third quarter with strong cash position of $435.3 million


BERKELEY, CA, November 9, 2021 (GLOBE NEWSWIRE) – Caribou Biosciences, Inc. (Nasdaq: CRBU), a leading clinical-stage CRISPR genome-editing biopharmaceutical company, today reported business highlights and financial results for the third quarter of 2021.


“Our important progress during 2021 continues as we advanced our lead therapeutic product candidate into the clinic, completed a successful IPO, and expanded our leadership team with highly experienced and regarded professionals,” said Rachel Haurwitz, Ph.D., Caribou’s president and chief executive officer. “Caribou’s differentiated chRDNA genome-editing technology and proprietary delivery approach enable high specificity multiplex editing, which we believe is key to the creation of sophisticated allogeneic CAR-T and CAR-NK therapies that have the potential to provide persistent antitumor activity. We are developing our four wholly-owned allogeneic cell therapy product candidates for the treatment of hematologic and solid tumors, including our lead product candidate, CB-010, which is being evaluated in the ANTLER Phase 1 clinical trial in patients with relapsed or refractory B cell non-Hodgkin lymphoma. We look forward to achieving key milestones in 2022, including our plans to disclose initial data from the ANTLER trial as well as to file an IND for our next product candidate, CB-011.”


Recent Business Highlights


Published data demonstrating the significantly improved specificity of Caribou’s proprietary CRISPR hybrid RNA-DNA (chRDNA) guide technology compared to all-RNA guides. In September 2021, Caribou and its collaborators published studies demonstrating that its CRISPR hybrid RNA-DNA (chRDNA) guide technology provides significantly improved specificity compared to all-RNA guides, thereby enabling high levels of intended genomic edits in cells while eliminating or minimizing inadvertent off-target events. Higher specificity is a key advantage of Caribou’s cell therapies and of critical importance in therapies that contain multiple genome edits. The data were described in a peer-reviewed article entitled, “Conformational control of Cas9 by CRISPR hybrid RNA-DNA guides mitigates off-target activity in T cells,” in the journal Molecular Cell.




Expanded Caribou’s board of directors. Ran Zheng and Dara Richardson-Heron, M.D., were appointed to Caribou’s board of directors in September 2021 and November 2021, respectively. Ms. Zheng brings over 25 years of biotechnology industry leadership experience in biologics drug development with broad expertise in technical operations and the manufacture of gene and cell therapies and currently serves as chief executive officer of Landmark Bio. Dr. Richardson-Heron has over 25 years of leadership experience in the healthcare, corporate, nonprofit, and government sectors. She previously served as chief patient officer for Pfizer and chief executive officer for the YWCA of the USA and for the Greater NYC Affiliate of Susan G. Komen for the Cure. They join existing directors: Andrew Guggenhime (board chair), Scott Braunstein, M.D., Rachel Haurwitz, Ph.D., Natalie Sacks, M.D., and Nancy Whiting, Pharm.D.


Added to Caribou’s leadership team. In November 2021, Caribou appointed Ruhi Khan as chief business officer. Ms. Khan brings over 20 years of business development and investment management experience focused on the biotechnology and pharmaceutical industries.


Completed upsized IPO raising $321.0 million in net proceeds. In July and August 2021, Caribou completed its IPO, selling a total of 21,850,000 shares for aggregate net proceeds of $321.0 million, after deducting underwriting discounts and commissions and other offering expenses.


Upcoming Milestones


CB-010: Caribou expects to disclose initial data from the ongoing ANTLER Phase 1 trial in patients with relapsed or refractory B-NHL in 2022. CB-010 is an allogeneic anti-CD19 CAR-T cell therapy derived from healthy donor T cells engineered using Cas9 chRDNA technology to introduce a CD19-specific CAR into the TRAC gene locus, thus eliminating expression of the T cell receptor to reduce the risk of graft versus host disease. The T cells are further modified to knock out the PDCD1 gene, preventing the expression of the PD-1 protein, and with the intent of boosting the persistence of CAR-T cell antitumor activity.


CB-011: Caribou expects to file an Investigational New Drug (IND) application for its CB-011 program in 2022. CB-011 is an allogeneic anti-BCMA CAR-T cell therapy derived from healthy donor T cells that is being developed as a potential treatment for relapsed or refractory multiple myeloma. Caribou is engineering healthy donor T cells using its proprietary Cas12a chRDNA technology to introduce a humanized BCMA-specific CAR into the TRAC gene locus. In addition, Caribou utilizes an immune cloaking strategy designed to prevent rapid immune rejection of CB-011. This strategy comprises two edits: knockout of the endogenous B2M gene and site-specific insertion of a B2M–HLA-E fusion gene into the T cell genome.


CB-012: Caribou expects to file an IND application for its CB-012 program in 2023. CB-012 is an allogeneic anti-CD371 CAR-T cell therapy derived from healthy donor T cells for the potential treatment of relapsed or refractory acute myeloid leukemia. CB-012 cells are engineered using



Caribou’s proprietary Cas12a chRDNA technology to introduce a fully-human CD371-specific CAR into the TRAC locus and to armor the cells to promote their persistence.


CB-020: Caribou expects to announce target selection for its CB-020 program in 2022. CB-020, a CAR-NK product candidate, is the lead program in Caribou’s proprietary genome-edited iPSC-derived natural killer (iNK) cell therapy platform. Multiplex-edited CAR-NKs hold significant potential for treating a variety of solid tumor types.


Third Quarter 2021 Financial Results


Cash and cash equivalents: Caribou ended the third quarter of 2021 with cash and cash equivalents of $435.3 million, which includes $321.0 million in aggregate net proceeds from the company’s IPO completed in July and August 2021.


Licensing and collaboration revenue: Revenue generated from Caribou’s licensing and collaboration agreements was $4.0 million for the third quarter of 2021, compared to $1.2 million for the third quarter of 2020. The increase was primarily due to revenue recognized pursuant to the AbbVie collaboration agreement.


R&D expenses: Research and development expenses were $15.8 million in the third quarter of 2021, compared to $6.2 million in the third quarter of 2020. The increase was primarily due to costs associated with clinical trial and pre-clinical study activities, payroll-related expenses for increased headcount, and facilities expenses.


G&A expenses: General and administrative expenses were $6.8 million in the third quarter of 2021, compared to $3.2 million in the third quarter of 2020. The increase was primarily due to payroll-related expenses for increased headcount, legal and accounting services associated with operating as a public company, and facilities and other expenses.


Other income (expense): The company recorded a non-cash expense of $2.4 million related to the change in fair value of the success payments liability under its license agreement with Memorial Sloan Kettering Cancer Center (MSKCC) in the third quarter of 2021, primarily related to the increase in the fair value of Caribou’s common stock following the IPO.


Net loss: Net loss was $21.0 million for the third quarter of 2021, compared to $7.9 million for the third quarter of 2020.


About Caribou Biosciences, Inc.


Caribou is a clinical-stage CRISPR genome-editing biopharmaceutical company dedicated to transforming the lives of patients with devastating diseases by applying the company’s proprietary chRDNA technology toward the development of next-generation, genome-edited



allogeneic immune cell therapies. The company is developing a pipeline of genome-edited, off-the-shelf CAR-T and CAR-NK cell therapies for the treatment of both hematologic malignancies and solid tumors. The therapies target cell surface antigens for which autologous CAR-T cell therapeutics have previously demonstrated clinical proof-of-concept as well as additional emerging targets.


For more information about Caribou, visit www.cariboubio.com and follow the company @CaribouBio.


“Caribou Biosciences” and the Caribou logo are registered trademarks of Caribou Biosciences, Inc.


Forward-Looking Statements


This press release contains forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, without limitation, statements related to Caribou’s strategy, plans and objectives, and expectations regarding its clinical and preclinical development programs, including its timing expectations. Management believes that these forward-looking statements are reasonable as and when made. However, such forward-looking statements are subject to risks and uncertainties, and actual results may differ materially from any future results expressed or implied by the forward-looking statements. Risks and uncertainties include without limitation the risks inherent in drug development such as those associated with the initiation, cost, timing, progress, and results of current and future research and development programs, preclinical studies, and clinical trials, as well as other risk factors described from time to time in Caribou’s filings with the Securities and Exchange Commission, including its final prospectus filed on July 23, 2021. In light of the significant uncertainties in these forward-looking statements, you should not rely upon forward-looking statements as predictions of future events. Except as required by law, Caribou undertakes no obligation to update publicly any forward-looking statements for any reason.


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Caribou Biosciences, Inc.

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Caribou Biosciences, Inc.

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Caribou Biosciences, Inc.


Amy Figueroa, CFA

Investor Relations and Corporate




Elizabeth Wolffe, Ph.D., and Sylvia Wheeler

Wheelhouse LSA






Greg Kelley