# EDGAR Filing Document

**Accession Number:** 0001854270
**File Stem:** 0001854270-23-000008
**Filing Date:** 2023-1
**Character Count:** 54867
**Document Hash:** 998782232c11a26eb695a339a50bea62
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001854270-23-000008.hdr.sgml**: 20230127

**ACCESSION NUMBER**: 0001854270-23-000008

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 54

**CONFORMED PERIOD OF REPORT**: 20230127

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Other Events

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20230127

**DATE AS OF CHANGE**: 20230127

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Senti Biosciences, Inc.
- **CENTRAL INDEX KEY:** 0001854270
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **IRS NUMBER:** 862437900
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-40440
- **FILM NUMBER:** 23559646

**BUSINESS ADDRESS:**
- **STREET 1:** 2 CORPORATE DRIVE, FIRST FLOOR
- **CITY:** SOUTH SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94080
- **BUSINESS PHONE:** (650) 382-3281

**MAIL ADDRESS:**
- **STREET 1:** 2 CORPORATE DRIVE, FIRST FLOOR
- **CITY:** SOUTH SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94080

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Senti Biosciences, Inc.\
- **DATE OF NAME CHANGE:** 20220615

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Dynamics Special Purpose Corp.
- **DATE OF NAME CHANGE:** 20210331

?xml version="1.0" ? snti-20230127

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

___________________________________

**FORM 8-K**

___________________________________

**CURRENT REPORT**

**Pursuant to Section 13 or 15(d)**

**of the Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported): January 27, 2023**

___________________________________

**SENTI BIOSCIENCES, INC.**

**(Exact name of registrant as specified in its charter)**

___________________________________

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| | | |
|:---|:---|:---|
| **Delaware** | **001-40440** | **86-2437900** |
| **(State or other jurisdiction**<br>**of incorporation)** | **(Commission**<br>**File Number)** | **(IRS Employer**<br>**Identification No.)** |

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**2 Corporate Drive, First Floor**

**South San Francisco, California 94080**

**(Address of principal executive offices including zip code)**

**Registrant's telephone number, including area code: (650) 382-3281**

**(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:

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| | | |
|:---|:---|:---|
| **Title of each class** | **Trading**<br>**Symbol** | **Name of each exchange**<br>**on which registered** |
| **Common Stock, par value $0.0001 per share** | **SNTI** | **The Nasdaq Global 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. ☒

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**Item 7.01.&nbsp;&nbsp;&nbsp;&nbsp;Regulation FD Disclosure.**

Reference is made to the disclosure set forth below in Item 8.01 of this Current Report on Form 8-K which is incorporated herein by reference.

On January 27, 2023, Senti Biosciences, Inc., (the "<u>Company</u>") issued a press release (the "<u>Press Release</u>") titled, "Senti Bio Announces Pipeline Prioritization to Focus on Logic Gated Cell Therapies; Updates Cash Runway Guidance," a copy of which is furnished herewith as Exhibit 99.1. The information in this Item 7.01 of Form 8-K and Exhibit 99.1 attached hereto is furnished and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "<u>Exchange Act</u>"), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 (the "<u>Securities Act"</u>), as amended or the Exchange Act. The information in this Item 7.01 of this Current Report on Form 8-K will not be deemed an admission as to the materiality of any information that is required to be disclosed solely by Regulation FD.

**Item 8.01.&nbsp;&nbsp;&nbsp;&nbsp;Other Events.** 

On January 27, 2023, the Company announced a strategic plan to focus internal resources on SENTI-202, SENTI-401 and, with potential partners, to develop Gene Circuits for other programs. The Company also announced that it does not intend to devote its own resources to the development of SENTI-301A for the treatment of hepatocellular carcinoma at this time, and is actively pursuing strategic geographic partnerships for further clinical development of SENTI-301A. This business realignment will streamline internal efforts and is expected to extend the Company's cash runway through at least the first quarter of 2024. In connection with this announcement, the Company has also updated certain corporate information in a presentation slide deck. A copy of this corporate presentation is filed herewith as Exhibit 99.2 to this Current Report on Form 8-K and incorporated by reference herein.

*Cautionary Statement*

This filing and the exhibits include "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act and Section 21E of the Exchange Act, and are making this statement for purposes of complying with those safe harbor provisions. These forward-looking statements reflect our current views about our plans, intentions, expectations, strategies, and prospects, which are based on the information currently available to us and on assumptions we have made. Important factors that may cause actual results to differ materially from those described in the forward-looking statements are disclosed in the respective exhibits and in the "Risk Factors" contained in the Company's Form 10-Q filed with the Securities and Exchange Commission (the "Commission") on November 10, 2022, and other filings we make with the Commission. All forward-looking statements are expressly qualified in their entirety by such factors. We do not undertake any duty to update any forward-looking statement except as required by law.

**Item 9.01 Financial Statements and Exhibits.**

(d) Exhibits

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| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 99.1 | <u>[Press Release, dated as of January](a20230127ex991pressrelease.htm)[27,](a20230127ex991pressrelease.htm)[2023](a20230127ex991pressrelease.htm)</u> |
| 99.2 | <u>[Corporate presentation](corporatepresentation_1-.htm)</u> |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

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**SIGNATURE**

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

---

| | | | |
|:---|:---|:---|:---|
| | | **SENTI BIOSCIENCES, INC.** | **SENTI BIOSCIENCES, INC.** |
| Date: | January 27, 2023 | By: | /s/ Timothy Lu |
|  |  | Name: | Timothy Lu, M.D., Ph.D. |
|  |  | Title: | Chief Executive Officer & President |

---

## Exhibit 99.1

![senti_logoxpr.jpg](senti_logoxpr.jpg)

**Senti Bio Announces Pipeline Prioritization to Focus on Logic Gated Cell Therapies; Updates Cash Runway Guidance** 

*– R&D focus is on lead oncology candidate SENTI-202 for the treatment of AML and other CD33 and/or FLT3 expressing hematologic malignancies, and SENTI-401 to target colorectal cancer and other CEA-positive solid tumors –*

*– SENTI-202 on track for IND filing in 2H 2023 –*

*– Cash runway guidance extended through at least Q1 2024 –*

**SOUTH SAN FRANCISCO, Calif., January 27, 2023** — Senti Biosciences, Inc. (Nasdaq: SNTI) ("Senti Bio"), a biotechnology company innovating next-generation cell and gene therapies using its proprietary Gene Circuit technology platform, today announced a strategic plan to focus internal resources on SENTI-202, SENTI-401 and, with potential partners, to continue to pursue the development of Gene Circuits for other programs, including solid tumors. The Company does not intend to invest in the clinical development of SENTI-301A, for the treatment of hepatocellular carcinoma (HCC), on its own at this time; however, the Company believes there is significant market opportunity for SENTI-301A, especially in territories within Asia where HCC is more prevalent than in the United States. Accordingly, the Company is actively pursuing strategic geographic partnerships for clinical development of SENTI 301A. This business realignment will streamline internal efforts and is expected to extend the Company's cash runway through at least the first quarter of 2024.

With SENTI-202, a Logic Gated (OR+NOT) off-the-shelf CAR-NK cell product candidate that is designed to target and eliminate acute myeloid leukemia (AML) cells while sparing the healthy bone marrow, the Company has commenced IND-enabling studies and remains on track to file an IND application in the second half of 2023. In addition, the Company has initiated the technology transfer to its cGMP manufacturing facility as part of its goal to provide clinical-scale manufacturing for its off-the-shelf CAR NK cell product candidates, including SENTI-202.

"We are laser focused on developing cell therapies engineered with Gene Circuits to enable selective killing of tumor cells while protecting healthy cells. Our Gene Circuits, especially our NOT gate, are designed to enable advanced cell and gene therapies to potentially have enhanced precision, activity and control, across therapeutic areas and delivery modalities, including NK cells and T cells," said Timothy Lu, MD, PhD, Chief Executive Officer and Co-Founder of Senti Bio. "By focusing on SENTI-202 and SENTI-401, both of which incorporate NOT gates, we believe that we are well positioned to maximize opportunities across these two oncology programs while advancing Gene Circuits in a variety of other disease areas with potential partners."

Dr. Lu added, "The team's accomplishments with SENTI-202 have generated very promising data over the past year that was presented at the American Society of Hematology (ASH) Annual Meeting last month. The data included human cell models and *in vivo* models that showcase the ability of our OR gate to broadly kill CD33 and/or FLT3 expressing leukemic blasts and leukemic stem cells, and our NOT gate to protect healthy cells expressing the EMCN protective antigen, including human hematopoietic stem cells. The team has completed pre-IND interactions with the FDA and believes that our planned IND-enabling studies and manufacturing and analytical processes will support a Phase 1 trial for SENTI-202, with the ultimate goal of targeting patients with CD33 and/or FLT3 expressing hematologic malignancies including AML and myelodysplastic syndrome (MDS). Initiating process and analytical technology transfer to our Alameda cGMP facility is another milestone that puts us one step closer to providing clinical-scale manufacturing for our CAR-NK cell development candidates."

The SENTI-401 program incorporates multiple Gene Circuit technologies to target solid tumors expressing the CEA tumor antigen, including colorectal cancer. Senti Bio has recently demonstrated, including data presented at the Society for Immunotherapy of Cancer (SITC) conference in November 2022, that CAR-NK cells expressing a potent CEA-targeting activating CAR along with two multifunctional cytokines (calibrated-release IL-15 and IL-21) exhibited significant activity in killing CEA-expressing tumors *in vitro*, even in the presence of inhibitory TGF-beta, and in mice. Furthermore, Senti Bio's optimized NOT gate technology was shown to achieve up to 98% protection of model healthy cells that express CEA along with a protective antigen, VSIG2. The Company believes the

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combination of Logic Gating and Multi Arming Gene Circuits within a single CAR-NK development candidate demonstrates the potential for Senti Bio's Gene Circuit technologies to be expanded to a wide range of solid tumor indications beyond SENTI-202 and SENTI-401.

Beyond oncology, the Company is continuing its strategic research collaborations with Spark Therapeutics on next-generation AAV gene therapy, and BlueRock Therapeutics on iPSC-derived cell therapies.

**About Senti Bio**

Our mission is to create a new generation of smarter medicines that outmaneuver complex diseases using novel and unprecedented approaches. To accomplish this, we are building a synthetic biology platform that may enable us to program next-generation cell and gene therapies with what we refer to as Gene Circuits. These novel and proprietary Gene Circuits are designed to reprogram cells with biological logic to sense inputs, compute decisions and respond to their cellular environments. We aim to design Gene Circuits to improve the intelligence of cell and gene therapies in order to enhance their therapeutic effectiveness, precision, and durability against a broad range of diseases that conventional medicines do not readily address.

Our synthetic biology platform utilizes off-the-shelf chimeric antigen receptor natural killer (CAR-NK) cells, outfitted with Gene Circuit technologies, to target particularly challenging liquid and solid tumor oncology indications. Our lead product candidate is SENTI-202 for the treatment of CD33 and/or FLT3 expressing hematologic malignancies, such as AML and MDS. Additionally, our SENTI-401 program is being designed for the treatment of colorectal cancer (CRC) and other CEA-positive cancers. We have also demonstrated in preclinical studies the potential breadth of our Gene Circuits in other modalities, including T cells, AAVs and iPSCs, and diseases outside of oncology; and we have executed partnerships with Spark Therapeutics and BlueRock Therapeutics to advance these capabilities.

**Forward-Looking Statements**

This press release and document contain certain statements that are not historical facts and are considered forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements generally are identified by the words "believe," "could," "predict," "continue," "ongoing," "project," "expect," "anticipate," "estimate," "intend," "strategy," "future," "opportunity," "plan," "may," "should," "will," "would," "will be," "will continue," "will likely result," "forecast," "seek," "target" and similar expressions that predict or indicate future events or trends or that are not statements of historical matters. Forward-looking statements are predictions, projections, and other statements about future events that are based on current expectations of Senti Bio's management and assumptions, whether or not identified in this document, and, as a result, are subject to risks and uncertainties. Forward-looking statements include, but are not limited to, statements regarding Senti Bio's research and development activities, including the development of the Company's SENTI-202 product candidate and the advancement of its SENTI-401 program, its interactions with regulatory authorities and plans to submit an IND application for SENTI-202, its plans to pursue potential strategic partnerships for SENTI 301A and other programs, its projected cash runway; and its continuation of its collaborations with Spark Therapeutics and BlueRock Therapeutics, as well as the timing of these events, as well as statements about the potential attributes and benefits of Senti Bio's product candidates and platform technology. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as and must not be relied on by any investor as, a guarantee, an assurance, a prediction, or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ from assumptions. Many actual events and circumstances are beyond the control of Senti Bio. Many factors could cause actual future results to differ materially from the forward-looking statements in this document, including but not limited to: the risk that results observed in studies of the Company's product candidates, including preclinical studies and future clinical trials of any of its product candidates, will not be observed in ongoing or future studies involving these product candidates, the risk that Senti Bio may cease or delay development of any of its product candidates for a variety of reasons (including requirements that may be imposed by regulatory authorities on the initiation or conduct of clinical trials, the amount and type of data to be generated, or otherwise to support regulatory approval, difficulties or delays in subject enrollment and continuation of clinical trials, difficulties in manufacturing or supplying Senti Bio's product candidates for preclinical and clinical testing, and any adverse events or other negative results that may be observed during preclinical or clinical development), Senti Bio's ability to obtain, maintain, and protect its

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intellectual property, Senti Bio's dependence on third parties for development and manufacture of product candidates, Senti Bio's ability to manage expenses and to obtain additional funding when needed to support its business activities and establish and maintain strategic business alliances and new business initiatives, the impacts of macroeconomic and geopolitical events, including changing conditions from the COVID-19 pandemic, the hostilities in Ukraine, increasing rates of inflation and rising interest rates on business operations and expectation, and the risk that Senti Bio's product candidates may not have beneficial attributes or may cause other unanticipated adverse effects. The foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties described in the "Risk Factors" section of Senti Bio's Quarterly Report on Form 10-Q, filed with the SEC on November 10, 2022, and other documents filed by Senti Bio from time to time with the SEC. These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements in this document. There may be additional risks that Senti Bio does not presently know, or that Senti Bio currently believes are immaterial that could also cause actual results to differ from those contained in the forward-looking statements in this document. Forward-looking statements speak only as of the date they are made. Senti Bio anticipates that subsequent events and developments may cause Senti Bio's assessments to change. Except as required by law, Senti Bio assumes no obligation to update publicly any forward-looking statements, whether as a result of new information, future events, or otherwise.

**Availability of Other Information About Senti Biosciences, Inc.**

For more information, please visit the Senti Bio website at https://www.sentibio.com or follow Senti Bio on Twitter (@SentiBio) and LinkedIn (Senti Biosciences). Investors and others should note that we communicate with our investors and the public using our company website (www.sentibio.com), including, but not limited to, company disclosures, investor presentations and FAQs, Securities and Exchange Commission filings, press releases, public conference call transcripts and webcast transcripts, as well as on social media. The information that we post on our website or on social media could be deemed to be material information. As a result, we encourage investors, the media and others interested to review the information that we post there on a regular basis. The contents of our website or social media shall not be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended.

Find more information at sentibio.com

Follow us on Linkedin: Senti Biosciences

**Contact Senti Bio:**

Email: investors@sentibio.com

Kelli Perkins (Media)

Email: kelli@redhousecomms.com

## Exhibit 99.2

![](corporatepresentation_1-001.jpg)™ JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Engineering the Future of Cell and Gene Therapies 1 January 2023

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![](corporatepresentation_1-002.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Disclaimer 2 Forward Looking Statements This presentation contains forward-looking statements. Statements we make in this presentation may include statements which are not historical facts and are considered forward-looking within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which are usually identified by the use of words such as "anticipates," "believes," "estimates," "expects," "future," "opportunity," "proposed," "targets," "intends," "may," "plans," "projects," "seeks," "should," "will," and variations of such words or similar expressions. We intend these forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27A of the Securities Act and Section 21E of the Securities Exchange Act and are making this statement for purposes of complying with those safe harbor provisions. These forward-looking statements, including statements relating to the attributes and benefits of our technology platform and our product candidates, including their therapeutic potential, our plans to submit an IND and the timing of such submission, the generation and presentation of data regarding preclinical programs and the related timing, our proposed Phase 1 studies, including study design and endpoints, our ability to enter into and pursuit of new collaborations, our manufacturing process and its potential benefits, the benefits of our cell source, and our cash runway, reflect our current views about our plans, intentions, expectations, strategies and prospects, which are based on the information currently available to us and on assumptions we have made. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on as a guarantee, an assurance, a prediction or a definitive statement of fact or probability. Although we believe that our plans, intentions, expectations, strategies and prospects as reflected in or suggested by those forward-looking statements are reasonable, we can give no assurance that the plans, intentions, expectations or strategies will be attained or achieved. Many actual events and circumstances are difficult or impossible to predict, are beyond our control and will differ from assumptions. Furthermore, actual results may differ materially from those described in the forward-looking statements and will be affected by a variety of risks and factors that are beyond our control including, without limitation, the risk that results observed in studies of our product candidates, including preclinical studies and future clinical trials of any of our product candidates, will not be observed in ongoing or future studies involving these product candidates, the risk that we may cease or delay clinical development of any of our product candidates for a variety of reasons (including requirements that may be imposed by regulatory authorities on the initiation or conduct of clinical trials, the amount and type of data to be generated, or otherwise to support regulatory approval, difficulties or delays in subject enrollment and continuation in current and planned clinical trials, difficulties in manufacturing or supplying our product candidates for preclinical and clinical testing, and any adverse events or other negative results that may be observed during preclinical or clinical development), our ability to obtain, maintain and protect our intellectual property, our dependence on third parties for development and manufacture of product candidates, our ability to manage expenses and to obtain additional funding when needed to support our business activities and establish and maintain strategic business alliances and new business initiatives, the impacts of macroeconomic and geopolitical events, including changing conditions from the COVID-19 pandemic, the hostilities in Ukraine, increasing rates of inflation and rising interest rates on business operations and expectation, and the risk that our product candidates may not produce therapeutic benefits or may cause other unanticipated adverse effects, as well as those set forth in the section titled "Risk Factors" in our Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on November 10, 2022, and our subsequent SEC filings. Except as required by law, we assume no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise. Trademarks This document contains references to trademarks, trade names and service marks belonging to other entities. Solely for convenience, trademarks, trade names and service marks referred to in this presentation may appear without the® or TM symbols, but such references are not intended to indicate, in any way, that the applicable owner will not assert, to the fullest extent under applicable law, its rights to these trademarks and trade names. We do not intend our use or display of other entities' trade names, trademarks or service marks to imply a relationship with, or endorsement or sponsorship of us by, any other entities.

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![](corporatepresentation_1-003.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Gene Circuits Multi-Arming Logic Gating (OR and NOT GATEs) Regulator Dial Smart Sensor to reprogram cells to sense, compute, and respond to disease Pioneering Smarter Next Generation Cell and Gene Therapies 3 Pipeline of CAR-NK Cell Therapies Diseases: blood cancers and solid tumors Gene Circuit advantages: multi-arming, selectivity and control Manufacturing: off-the-shelf, scalable with outpatient potential Platform Collaborations Precise gene therapy for eye, CNS and liver applications Targeted and controllable iPSC cell therapies for regenerative medicine Public June 2022 \| Anticipated Cash Runway Through At Least Q1 2024 \| Headquartered South San Francisco, CA CNS: Central Nervous System

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![](corporatepresentation_1-004.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Senti's Gene Circuit Technology Has Broad Potential Across Modalities and Therapeutic Areas 4 Wholly-Owned Programs with Opportunities for Future Development Opportunities for Future Development and Additional Partnering Multi-Arming Logic Gating Regulator Dial Smart Sensor Blood cancers Solid tumors Regenerative medicine Blood cancers Solid tumors Immunology Blood cancers Solid tumors Liver diseases Eye diseases CNS NK cells T cells in vivo Gene Therapy iPSCs Gene Circuit Technology

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![](corporatepresentation_1-005.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Industry-Leading Management With Top-Tier Board and Scientific Advisors 5 Executive Team James Collins, PhD Scientific Co-Founder, MIT Wilson Wong, PhD Scientific Co-Founder, Boston University Ahmad (Mo) Khalil, PhD Boston University Martin Fussenegger, PhD ETH Zurich Scientific Advisors Michael Varney, PhD Erasca, Genentech Michael Kalos, PhD Arsenal, Janssen, Lilly Lawrence Fong, PhD UCSF Michael Andreeff, MD, PhD MD Anderson Cancer Center Robin Taylor, PhD, MBA SeaGen, Genentech Board of Directors David R. Epstein Seagen Inc. Omid Farokhzad, MD Seer Inc. Brenda Cooperstone, MD Pfizer Rare Disease James Collins, PhD Scientific Co-Founder, MIT Susan Berland Senior Financial Executive Ed Mathers NEA Tim Lu MD, PhD CEO & Co-Founder Tim Lu, MD, PhD CEO & Co-Founder Philip Lee, PhD CTO & Co-Founder Kanya Rajangam, MD, PhD Chief Medical and Development Officer (CMDO) Deb Knobelman, PhD CFO

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![](corporatepresentation_1-006.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S CAR-NK Cell Therapy Pipeline 6

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![](corporatepresentation_1-007.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Gene Circuits Designed to Solve for Key Cell Therapy Challenges 7 Senti's Gene Circuit Solutions Cancer Cell Therapy Challenges Lack of cell expansion and persistence Antigen escape and tumor heterogeneity Dirty targets (on-target, off-tumor toxicity) Immunosuppressive tumor microenvironment Multi-Arming Autocrine and paracrine activation with proprietary Calibrated Release IL-15 (crIL-15) and other complementary cytokines (e.g., IL-21) Bivalent activating CAR with OR Logic Gate Inhibitory CAR protects healthy cells with NOT Logic Gate Pulsed Calibrated Release IL-12 with small molecule- controlled Regulator Dial Logic Gating Logic Gating Regulator Dial

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![](corporatepresentation_1-008.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S NK Cells Compare Favorably to T Cell Based Therapies 81 Lamers-Kok Journal of Hematology & Oncology 2022; 2 Bachier 2021 Capabilities Current Auto T Cells Off-the-shelf potential with broad patient accessibility Designed with Logic Gates to achieve enhanced selectivity and safety Engineered with enhanced persistence   N/A ✓ ✓ ✓ Senti's CAR-NK Cells Engineered to stimulate the patient immune system  ✓ Scalable and cost-effective manufacturing process  ✓ Extensive clinical experience with allogeneic donor-derived unengineered NK cells1 • ~70 global peripheral blood derived unengineered NK cell therapy clinical trials1 • Well-tolerated (~500 patients clinical experience)2 o No (or minimal) CRS, neurotoxicity, GvHD • Anti-tumor activity observed in AML2 o 19% CR in 105 R/R AML patients aggregated from multiple trials Key limitations of unengineered NK cells Limited activity beyond AML, persistence, durability, donor variability and select single clinical center usage Senti's Gene Circuit technology, proprietary expansion and cryopreservation processes and extensive donor selection address these limitations

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![](corporatepresentation_1-009.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S 9 Peripheral Blood-Sourced NK Cells Provide Multiple Advantages for Next Generation CAR-NK Cell Therapies Features Cord Blood NK Cells NK Cell Expandability Potency and Function Genetic Engineering Increased expansion potential but smaller number of starting cells Similar expandability to peripheral blood iPSC-Derived NK-Like Cells GMP Process Maturity Peripheral Blood NK Cells Established methods for 1,000- 10,000-fold expansion in 14-21 days More immature repertoire of NK cells Unclear if identical to primary NK cells Full repertoire of functional and mature NK cells Well established protocols for genetic engineering iPSC engineering and clone selection with extensive pre-clinical characterization Well established protocols for genetic engineering Established unit operations for clinical process More complex, multistage process Well established unit operations for clinical process with defined path for commercial scaling process Clinical Experience Modest clinical experience with 30+ clinical trials using cord-derived NK cells Limited clinical experience - 4 clinical trials using iPSC derived NK cells Widely used NK cell source in clinical trials with 200+ clinical trials using peripheral NK cells Peripheral blood-sourced NK cells allow us to immediately leverage an established supply chain, a mature GMP process, and extensive clinical experience to develop our next generation CAR-NK cell therapies

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![](corporatepresentation_1-010.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Calibrated Release IL-15 (crIL-15) Increases Persistence and Activation of Both CAR-NK and Immune Cells in Tumor Milieu 10 0 1 2 3 4 5 0 1 2 3 4 5 6 7 8 9 Tu m o r C el l A b u n d an ce Days Vehicle Unengineered NK Cells crIL-15 CAR-NK Cells sIL-15 CAR-NK Cells sIL-15: secreted wild-type IL-15 0 2,000 4,000 6,000 sIL-15 CAR-NK crIL-15 CAR-NK Pa ra cr in e A ct iv it y (p ST AT 5 M FI) Phospho STAT5 levels increased in T cells exposed to supernatant from either crIL-15 or sIL-15 CAR-NK cell culture crIL-15: IL-15 released by local proteases → autocrine and paracrine effects crIL-15 has paracrine activity and activates resting immune cells crIL-15 increases persistence of CAR- NK cells 0 0.2 0.4 0.6 0.8 1 0 5 10 15 20 25 V ia b le C e lls (e6) Days in Culture crIL-15 increases CAR-NK serial killing compared to secreted IL-15 Cancer cells added Cancer cells added Cancer cells added crIL-15 CAR-NK Cells Unengineered NK Cells

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![](corporatepresentation_1-011.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Today's Cell Therapies Are Largely Guided by Single CAR System and Limited to a Small Set of Potential Therapeutic Targets 11 Only ~5% of potential surface proteins have been utilized in CAR therapies On-target / off-tumor killing leading to poor therapeutic window Two key limitations of today's cell therapies Heterogeneous antigen expression leading to tumor escape

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![](corporatepresentation_1-012.jpg)

JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Senti's Gene Circuit Technology Has the Potential to Expand the Range of CAR Cell Therapies With Enhanced Efficacy and Precision 12 Expanding the range of potential therapeutics into the "empty" space Inhibitory CAR: NOT GATESenti's next-gen capabilities Bivalent activating CAR: OR GATE

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Senti's Discovery Platform for Tumor-Associated Antigen and Protective Antigen to Generate Many Targets for New Logic Gated CAR-NK Candidates 13 52 31 Expression in tumor cells A B C 4 Healthy tissue expression of A Expression in tumor cells D E F 1 2 3 4 5 Healthy tissue expression of E RNA expression data Filter for cell surface expression Curation and experimental validation Tumor-Associated Antigen discovery Protective Antigen discovery TissuesPotential Tumor- Associated Antigens TissuesPotential Protective Antigens

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Gene Circuits Can Vastly Expand the Universe of Cancer Targets and Tumors That Can Be Addressed With Cell Therapies 14 Heme Malignancies Solid Tumors N ee d f o r H ea lt h y C el l P ro te ct io n FLT3\* CD33\* CEA\* Target GPC3\* OR GATE to enhance efficacy and deepen response Multi-Arming +/- Regulator Dial to overcome immunosuppressive TME NOT GATE enables expansion to dirty targets Logic Gating Multi-Arming Gene Circuit Technologies \* Senti's disclosed CAR-NK targets Target Target Target Target TargetTarget Target Target Target Target Target Target Target Target Target Target Target CD19 BCMA Approved autologous CAR-T cell therapies Regulator Dial

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Senti's Next Generation CAR-NK Cell Therapy Pipeline Tackles Hard to Treat Cancers 15 Program Target Indications Discovery IND enabling Phase 1 Gene Circuits SENTI-202 CD33 and/or FLT3 AML, MDS and other blood cancers ✓ Multi-Arming: designed for enhanced efficacy ✓ crIL-15: autocrine and paracrine activation ✓ OR GATE: bivalent activation ✓ NOT GATE selectivity: healthy cell protection SENTI-401 CEA CRC and other solid tumors ✓ Multi-Arming: designed for enhanced efficacy ✓ crIL-15: autocrine and paracrine activation ✓ NOT GATE selectivity: healthy cell protection ✓ IL-21: sustained anti-tumor function SENTI-301A GPC3 HCC and other solid tumors ✓ Multi-Arming: designed for enhanced efficacy ✓ crIL-15: autocrine and paracrine activation Additional Programs Undisclosed Other tumors Program candidates integrate Multi-Arming, Logic Gating and/or Regulator Dial Gene Circuits 2H 2023 IND Potential for partnering or future clinical development

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Manufacturing 16

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Scalable Manufacturing to Support Off-The-Shelf CAR-NK Products 17 Lentivi rus Outpatient use potential Patient Isolate from selected donors Thaw and infuse Scalable ~21 Day Process NK Cells Selected Donor Gene Circuit Engineered CAR-NK cells Engineer CryopreserveExpand Off-The-Shelf Gene Circuits 1 2 3 4 5 Easy to thaw vials Final product harvested and cryopreserved >100 doses per batch NK cells isolated from peripheral blood of selected donors NK cells efficiently engineered with Gene Circuits High post-thaw potency

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Senti Selects NK Cell Donors to Support Robust Cell Expansion 18 Senti screens and selects GMP donors using NK cell expansion and other functional attributes to minimize variability 1.E+08 1.E+09 1.E+10 1.E+11 1.E+12 1.E+13 1.E+14 1.E+15 0 10 20 30 40 To ta l N K C el ls f ro m S el ec te d S in gl e D o n o r Culture Time (Days) Senti process can potentially generate over 100 trillion NK cells from a single donor collection Preferred Donors 0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 A B C D E F G H I J K L Fo ld E xp an si o n (2 1 D ay s) Donors

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Senti's Cryopreservation Process Retains High Potency of CAR-NK Products Supporting Multi-Country and Multi-Site Clinical Evaluation 19 0 10 20 30 40 50 60 70 80 90 100 Pre-Freeze Post-Thaw % V ia b le C el ls CAR-NK cell viability retained post-thaw in vitro Vehicle Cryopreserved CAR-NK Cells In vivo activity with cryopreserved CAR NK cells in MOLM13 AML NSG mouse model (10 days after single dose)

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Pipeline Products 20

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-202 for CD33 and/or FLT3 Expressing Blood Cancers 21 Multi-Armed, off-the-shelf, selective CAR-NK • OR GATE: bivalent CD33 and/or FLT3 activation → potential for deep and durable responses in acute myeloid leukemia (AML) and other blood cancers. • NOT GATE: inhibition by endomucin (EMCN) protective antigen selectively expressed on healthy hematopoietic stem cells (HSCs) → potential for improved safety and increased therapeutic window • crIL-15 → potential for increased persistence, autocrine and paracrine immune cell activation On track for IND in 2H 2023 LSCs: Leukemic Stem Cells

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-202 Aims to Address Unmet Needs in FLT3 and/or CD33 Expressing Blood Cancers With a Focus on AML 22 7,860 7 20,216 Protein Coding Genes 40 2,611 Membrane proteins High expression in AML Low non-hematopoietic expression Manual curation FLT3 and CD33 2,152 112 Confirm high AML expression Low healthy tissue expression Optimization for AML subpopulation coverage Proven Targets • FLT3 and/or CD33 expressed in ~95% of AML • Targeting FLT3 and CD33 with an OR GATE has potential of increased efficacy and deeper remission, due to decreased likelihood of tumor antigen escape • Rigorous bioinformatics approach was used to identify CD33 and FLT3 as an optimal aCAR pair to provide broad coverage of blasts and LSCs Bioinformatics approach to identify aCAR pair

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-202 Has Shown Robust Preclinical Activity Across Multiple AML / MDS Models 23 Broad in vitro killing of primary AML and MDS tumor cells In vivo suppression of tumor and increased mouse survival in MV4-11 AML NSG mouse model AML #1 0 10 20 30 40 50 60 70 80 90 100 Blasts LSCs Blasts LSCs Blasts LSCs Blasts % A M L/ M D S C e ll K ill in g Unengineered NK Cells SENTI-202 CAR-NK Cells AML #2 AML #3 MDS 0 20 40 60 80 100 0 20 40 60 80 100 P ro b ab ili ty o f Su rv iv al Days Post Tumor Implantation Vehicle Unengineered NK Cells SENTI-202 CAR-NK Cells Group Vehicle Unengineered NK Cells SENTI-202 CAR-NK Cells Median Survival (Days) 49 55 81.5 Vehicle Unengineered NK Cells SENTI-202 CAR-NK Cells Day: 7 28 34

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-202 Preclinical Selectivity via Inhibitory CAR Binding Endomucin to Protect Healthy Primary Human HSCs 24 In vitro protection of healthy primary human HSC fraction expressing EMCN Endomucin was identified and validated by bioinformatics, flow cytometry, and functional assays, and is expressed on up to 76% of HSCs, but not on leukemic stem cells or blasts. 0 10 20 30 40 50 60 CD33 and/or FLT3 CAR-NK Cells SENTI-202 CAR- NK Cells % K ill in g (L e u ke m ia) 0 5 10 15 20 25 30 35 40 45 50 CD33 and/or FLT3 CAR-NK Cells SENTI-202 CAR-NK Cells % K ill in g (E M C N + H SC s) I.V. injection Blood draw After 27 days N o rm al iz e d C o u n ts N o rm al iz e d C o u n ts N o rm al iz e d C o u n ts Unengineered NK Cells OR Gated CAR-NK Cells SENTI-202 CAR-NK Cells SENTI-202 CAR-NK Cells "Healthy" Cells Cancer Cells50:50 "Healthy" Cells Spared Cancer Cells Killed In vivo protection of EMCN+ model healthy cells

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Proposed Phase 1 Study in R/R CD33+ and/or FLT3+ Malignancies With Focus on AML 25 Proposed Phase 1 study anticipated to enroll R/R CD33+ and/or FLT3+ heme malignancies • Modified "3+3" study design • Received at least 1 prior treatment including targeted agents if FLT3, IDH1/2 mutation+ • 2 of 3 patients at each dose level with AML • Disease specific expansion cohorts for AML and MDS Planned study endpoints • Safety, DLT, identify recommended Phase 2 dose • Efficacy using standard ELN 2022 criteria for AML and other disease specific consensus criteria • PK, pharmacodynamics including endomucin protection, immunogenicity Lymphodepletion Fludarabine Cyclophosphamide SENTI-202 2-3 dose levels of cells Efficacy Additional cycles+ -5 to -3 0 7 14 28Days Planned Study Treatment/ Cycle Planned data-driven seamless Phase 1 to pivotal design 1 Seer estimates High unmet need in patients with AML • 20,050 newly diagnosed AML patients in the US1 • 30.5% 5-year survival1

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-401 for CEA Expressing Solid Tumors 26 Multi-Armed, off-the-shelf, selective CAR-NK • CEACAM5 (CEA) activating CAR → metastatic colorectal cancer (mCRC) and other solid tumors • NOT GATE: inhibition by VSIG2 antigen on healthy epithelial cells → potential for improved safety, increased therapeutic window and reduced on- target, off-tumor toxicity • crIL-15 → potential for increased persistence and autocrine and paracrine immune cell activation • IL-21 → construct to further potentiate persistence and efficacy of CAR-NK cells and to stimulate endogenous immune cells

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Colorectal Cancer Gastric Cancer Lung Cancer Pancreatic Cancer Breast Cancer Colon/Rectum Pancreas Lung Stomach Esophagus Healthy Tissues With CEA Overexpression3 Tumor Types With CEA Overexpression3 SENTI-401 Aims to Address Unmet Needs in CEA Expressing Solid Tumors With a Focus on mCRC 271 Seer estimates, 2 Parkhurst, et al. 3 Median expression of tumor and normal samples in body map (Log2 (TPM+1) scale). Source: TCGA, Gtex and Nat Genetics 2020 [GSE132465] CEA is an attractive cancer target • CEA is overexpressed in several solid tumors, including CRC (~85-90% CEA+) as well as NSCLC, gastric and esophageal cancers • CEA-targeted adoptive T cell trials reported objective regression but also observed colitis potentially from on-target, off-tumor toxicity2 SENTI-401 is designed to target CEA expressing tumors while minimizing on-target, off-tumor toxicity using a NOT GATE High unmet need in patients with colorectal cancer • 151,030 newly diagnosed CRC patients in the US1 • 65.1% 5-year survival rate1

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Robust Preclinical Activity With CEA CAR-NK Cells Multi-Armed With Both crIL-15 and IL-21 28 Arming CEA CARs with the combination of Senti's proprietary crIL-15 and IL-21 results in improved anti-tumor activity of NK cells 1 Nature 2018 0 1 2 3 4 5 1 2 3 4 5 6 N o rm al iz ed T u m o r C e ll A re a Days Vehicle crIL15 + IL21 CEA CAR-NK Cells crIL15 + IL21 CEA CAR-NK Cells + TGFβ Cancer cells added Cancer cells added Cancer cells added Sustained serial killing with CEA CAR-NK cells expressing crIL-15 and IL-21 even in the presence of the immunosuppressive cytokine TGFb TGFb is an immunosuppressive tumor factor highly expressed in CRC, known to suppress immune activation and help tumor escape1 Vehicle crIL-15 CEA CAR-NK Cells crIL-15+IL21 CEA CAR-NK Cells Day: Sacrificed Sacrificed 4 7 28 111 207 Sacrificed 0 20 40 60 80 100 0 30 60 90 120 150 180 210P ro b ab ili ty o f Su rv iv al Days Post Tumor Implantation Vehicle crIL-15 CEA CAR-NK Cells crIL-15+IL21 CEA CAR-NK Cells 0 10 20 0 40 50 0 70 80 0 100 11 0 120 130 140 150 160 170 180 190 200 210 0 10 20 30 40 50 60 70 80 90 100 Days Post T P er ce nt s ur vi va l Overall survival PBS p<0.0001 PBS vs CAR crIL-15 IL-21 CAR_crIL-15 CAR_crIL-15-IL-21 \*\*\*\*

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S 0 20 40 60 80 100 CEA CAR-NK Cells CEA NOT VSIG2 CAR-NK Cells Ta rg et C el l K ill in g (%) VSIG2- CEA+ VSIG2+ CEA+ Colorectal cancer CEACAM5 VSIG2 CEACAM5: 85-90% of CRC and 40-60% of other solid tumors including lung cancer1 VSIG2 was identified by bioinformatics using single cell RNA sequencing and validated as protective antigen with immunohistochemistry Healthy colon epithelium Decreased cell killing of VSIG2 expressing cells with addition of inhibitory CAR construct Green: VSIG2neg Red: VSIG2+ 98% protection Green: VSIG2- CEA+ Red: VSIG2+ CEA+ Senti's Approach to Select Paired Target and Protective Antigens Translates to Rapid Preclinical Proof of Principle for Protecting Healthy VSIG2+ cells 291 Goldstein 2005

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-301A for GPC3 Expressing Solid Tumors 30 Multi-Armed, off-the-shelf, selective CAR-NK • GPC3 activating CAR → hepatocellular carcinoma (HCC) and other solid tumors • crIL-15 → potential for increased persistence, autocrine and paracrine immune cell activation Pursuing strategic geographic partnerships to enable clinical development in areas with high HCC incidence such as in China

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-301A Aims to Address Unmet Needs in GPC3 Expressing Solid Tumors With a Focus on HCC 31 GPC3 is an attractive cancer target • Glypican-3 (GPC3) is a membrane-bound protein normally expressed in fetal tissues such as liver and placenta. • After birth, GPC3 is not expressed in healthy liver tissue or other human organs but is overexpressed in different tumor types, notably in HCC (70-90% GPC3+)1 and other solid tumors (29-54%2 GPC3+) • Academic GPC3 CAR-T cell trials have shown promising activity but limited by CAR-T toxicities precluding multiple dosing and limited durability3 SENTI-301A is designed to target GPC3 expressing tumors • Aim to address unmet need in HCC as the initial focus given the lack of targeted therapies and lack of effective immunotherapies • Tackle multiple solid tumors with high GPC3 antigen expression via NKs multi-armed with GPC3 CAR and crIL-15 1 Zheng 2022, 2 Moek 2018, 3 Shi 2020 Squamous Cell Lung Carcinoma Hepatocellular Carcinoma Large Cell Lung Carcinoma Ovarian Clear Cell Carcinoma Differentiated Thyroid Cancer Common GPC3 expressing tumors

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S SENTI-301A Preclinical Anti-Cancer Activity 32 Group Vehicle Unengineered NK Cells SENTI-301A CAR-NK Cells Median Survival (Days) 48 49.5 93.5 Effective in vitro serial killing of HepG2 cell line 0 1 2 3 0 1 2 3 4 5 6 Tu m o r C el l A b u n d an ce Days Vehicle Unengineered NK Cells SENTI-301A CAR-NK Cells Cancer cells added Cancer cells added Cancer cells added 0 20 40 60 80 100 0 20 40 60 80 100 120 P ro b ab ili ty o f Su rv iv al Days Post Tumor Implantation Vehicle Unengineered NK Cells SENTI-301A Increased survival and response in HepG2 mouse model

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Senti's Regulator Dial Enables On-Demand Production of crIL-12 Controlled via Multiple Distinct FDA-Approved Small Molecule Oral Drugs 33 Dose-dependent, reversible crIL-12 controlled by GRZ in vivo Vehicle GRZ at 50 mg/kg GRZ at 100 mg/kg 1 10 100 1,000 10,000 100,000 0 mg/kg50 mg/kg100 mg/kg 0 mg/kg50 mg/kg100 mg/kg 0 mg/kg50 mg/kg100 mg/kg Se ru m c rI L- 1 2 (p g /m L) Day 2 (GRZ ON) Day 9 (GRZ OFF) Day 11 (GRZ ON) DrugDrug Drug dose- dependent crIL-12 production CAR-NK activity suppressed by M2 macrophages → Activity restored by GRZ induced crIL-12 via Regulator Dial 0 20 40 60 80 1 G ra n zy m e B (%) 0.1 1.0 10.0 100.0 1,000.0 10,000.0 0 0.01 0.1 1 cr IL -1 2 p g /m L GRZ (uM) - + + + Cancer target cells - - + + M2 macrophages - - - + GRZ 0.1 1.0 10.0 100.0 1000.0 0 0.1 1 10 cr IL -1 2 p g /m L Endoxifen (uM)IL-12 is a well-known immuno- stimulatory cytokine • Increases NK and T cell activation and inhibits immunosuppressive cells such as tumor-associated macrophages • Responses noted with systemic administration of IL-121 IL-12 clinical use has been limited by toxicities • Regulator Dials control IL-12 production with FDA approved oral drugs such as grazoprevir (GRZ) and endoxifen (active metabolite of tamoxifen) • Opportunities for application across multiple solid tumor indications 1 Leonard 1997

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Platform and Collaboration Opportunities 34

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Multiple Platform Collaborations Extend Utility of Gene Circuits 35 Program Indications Gene Circuit Discovery IND enabling Phase 1 Rights Gene Therapies for Tissue-Directed Targets GC-1001/GC-1002 Eye Smart Sensor GC-1003/GC-1004 CNS Smart Sensor GC-1005 Liver Smart Sensor Cell Therapies for Regenerative Medicine GC-1101 Regenerative Medicine Regulator Dial GC-1102 Regenerative Medicine Regulator Dial GC-1103 Regenerative Medicine Smart Sensor

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Two Collaborations to Develop Next Generation Cell and Gene Therapies 36 AAV Gene Therapy with Cell Type-Specific Smart Sensor AAV Capsid Therapeutic Payload Low payload expression in OFF Target cell type(s) Compact promoter size to accommodate therapeutic payload transgene within ~4.5 kb AAV vector Synthetic Promoter Performance Profile: High payload expression in ON Target cell type AAV Gene Therapy with Cell Type-Specific Smart Sensor Collaboration for gene therapies Example Gene Circuits Gene Circuit-Engineered "Smart" Regenerative Medicines Senti Synthetic Promoter iPSC- derived Disease-Specific Smart Sensor1 Therapeutic Payload 2 Regulator Dial + Therapeutic Payload Oral drugOFF ON Senti's Synthetic Promoter Collaboration for cell therapies

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Constitutive control promoter >100% strength of CAG ~10,000-fold specificity Iterative performance optimization Sp e ci fi ci ty (r at io O N :O FF t ar ge t ce ll lin es) Strength (fraction of CAG, an industry standard constitutive promoter) Smart Sensor Promoters Are Designed to Address Key Challenges in Gene Therapy 37 Smart Sensor Promoter Data Senti's Gene Circuit Solutions Gene Therapy Challenges Off-target tissue toxicity Sub-optimal therapeutic performance Enhance target tissue specificity and limit off-target tissue toxicity Improve expression and increase potency Smart Sensor Smart Sensor Smart Sensor Promoters enable next-generation gene therapy by: • Enhancing specificity to target tissue(s) (and thus limiting off-target tissue toxicities) and • Increasing strength, potentially enabling more efficacious therapies

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Program 2022 Completed Milestones 2023 Anticipated Milestones SENTI-202 CD33 and/or FLT3 AML, MDS and other blood cancers Presented key preclinical data at ASH in December 2022 File IND application in 2H 2023 SENTI-401 CEA CRC and other solid tumors Presented preclinical data at SITC in November 2022 Present data at key scientific conferences SENTI-301A GPC3 HCC and other solid tumors Presented preclinical data at SITC in November 2022 Additional Programs Other tumors Initiated research work on additional CAR-NK pipeline programs Pre-clinical PoCs for additional pipeline candidates Manufacturing Initiated manufacturing activities and presented data at key conferences Completed Milestones and Upcoming Value Driving Milestones 38

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JA N U A R Y 2 0 2 3 \| SE N T I B IO SC IE N C E S Thank you 39

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