# EDGAR Filing Document

**Accession Number:** 0001321732
**File Stem:** 0001140361-23-008328
**Filing Date:** 2023-2
**Character Count:** 113185
**Document Hash:** eb0af0fa7215df247ffacab5b10be0fc
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-23-008328.hdr.sgml**: 20230223

**ACCESSION NUMBER**: 0001140361-23-008328

**CONFORMED SUBMISSION TYPE**: S-3ASR

**PUBLIC DOCUMENT COUNT**: 6

**FILED AS OF DATE**: 20230223

**DATE AS OF CHANGE**: 20230223

**EFFECTIVENESS DATE**: 20230223

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Penumbra Inc
- **CENTRAL INDEX KEY:** 0001321732
- **STANDARD INDUSTRIAL CLASSIFICATION:** SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-3ASR
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-269970
- **FILM NUMBER:** 23661079

**BUSINESS ADDRESS:**
- **STREET 1:** ONE PENUMBRA PLACE
- **CITY:** ALAMEDA
- **STATE:** CA
- **ZIP:** 94502
- **BUSINESS PHONE:** (510) 995-2486

**MAIL ADDRESS:**
- **STREET 1:** ONE PENUMBRA PLACE
- **CITY:** ALAMEDA
- **STATE:** CA
- **ZIP:** 94502

#### **TABLE OF CONTENTS**

#### As filed with the Securities and Exchange Commission on February 23, 2023

#### Registration No. 333-

### SECURITIES AND EXCHANGE COMMISSION<br>

### Washington, D.C. 20549

### FORM S-3<br>

### REGISTRATION STATEMENT <br>

### UNDER <br>

### THE SECURITIES ACT OF 1933

### PENUMBRA, INC.<br>

### (Exact Name of Registrant as Specified in Its Charter)

---

| | |
|:---|:---|
| **Delaware** | **05-0605598** |
| (State or Other Jurisdiction of <br>Incorporation or Organization) | (I.R.S. Employer <br>Identification Number) |

---

#### One Penumbra Place <br>

#### Alameda, CA 94502 <br>
(510) 748-3200<br>

#### (Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant's Principal Executive Offices)

#### Adam Elsesser<br>

#### Chairman, Chief Executive Officer and President<br>

#### Penumbra, Inc.<br>

#### One Penumbra Place<br>

#### Alameda, CA 94502<br>
(510) 748-3200<br>

#### (Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent For Service)

#### Copies to:

---

| | |
|:---|:---|
| **Johanna Roberts** <br>**Executive Vice President, General Counsel and** <br>**Secretary** <br>**Penumbra, Inc.** <br>**One Penumbra Place** <br>**Alameda, CA 94502** <br>(510) 748-3200 | **Alan F. Denenberg** <br>**Davis Polk & Wardwell LLP** <br>**1600 El Camino Real** <br>**Menlo Park, California 94025** <br>(650) 752-2000 |

---

#### Approximate date of commencement of proposed sale to the public : From time to time after this Registration Statement becomes effective.
If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒ Accelerated filer ☐ <br> Non-accelerated filer ☐ Smaller reporting company ☐ <br> 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 7(a)(2)(B) of the Securities Act. ☐

------

#### **TABLE OF CONTENTS**

#### PROSPECTUS
![](logo_penumbra.jpg)<br>

#### DEBT SECURITIES<br>

#### COMMON STOCK<br>

#### PREFERRED STOCK<br>

#### DEPOSITARY SHARES<br>

#### WARRANTS<br>

#### PURCHASE CONTRACTS<br>

#### UNITS
We may offer from time to time debt securities, common stock, preferred stock, depositary shares, warrants, purchase contracts or units. In addition, certain selling securityholders to be identified in a prospectus supplement may use this prospectus from time to time to offer and sell shares of common stock. Each time we or any selling securityholders sell securities under this prospectus, we will provide specific terms related to such sales in supplements to this prospectus. We may also authorize one or more free writing prospectuses to be provided to you in connection with these offerings. We may amend or supplement this prospectus from time to time by filing amendments or supplements as required. You should read this prospectus, any amendments or supplements, any free writing prospectuses, and any documents incorporated by reference carefully before you invest.

Our common stock is currently quoted on the New York Stock Exchange under the ticker symbol "PEN".

**Investing in these securities involves certain risks. See "[Risk Factors](https://www.sec.gov/ix?doc=/Archives/edgar/data/1321732/000132173223000034/pen-20221231.htm#ib99371ae08d04af6a858279cfd51df78_22)" beginning on page 22 of our Annual Report on Form 10-K for the year ended December 31, 2022, which is incorporated by reference herein.**

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved these securities, or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

#### The date of this prospectus is February 23, 2023

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#### **TABLE OF CONTENTS**
Neither we nor any selling securityholders to be identified in a supplement to this prospectus have authorized anyone to provide any information other than that contained or incorporated by reference in this prospectus or in any free writing prospectus prepared by or on behalf of us or to which we have referred you. We and any selling securityholders to be identified in a supplement to this prospectus take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. Neither we nor any selling securityholders to be identified in a supplement to this prospectus are making an offer of these securities in any state where the offer is not permitted. You should not assume that the information contained in or incorporated by reference in this prospectus or any prospectus supplement or in any such free writing prospectus is accurate as of any date other than their respective dates.

The terms "Penumbra," "Penumbra, Inc.," the "Company," "we," "us" and "our" refer to Penumbra, Inc. and its consolidated subsidiaries, unless expressly indicated or the context requires otherwise.

---

| | |
|:---|:---|
|  | **Page** |
| [The Company](#tTCO) | &nbsp;&nbsp;[1](#tTCO) |
| [Where You Can Find More Information](#tWYC) | &nbsp;&nbsp;[2](#tWYC) |
| [Special Note On Forward-Looking Statements](#tSNO) | &nbsp;&nbsp;[3](#tSNO) |
| [Use of Proceeds](#tUOP) | &nbsp;&nbsp;[4](#tUOP) |
| [Description of Capital Stock](#tDOC) | &nbsp;&nbsp;[5](#tDOC) |
| [Description of Depositary Shares Representing Preferred Stock](#tDOD) | &nbsp;&nbsp;[9](#tDOD) |
| [Description of Debt Securities](#tDOS) | &nbsp;&nbsp;[9](#tDOS) |
| [Description of Warrants](#tDOW) | [16](#tDOW) |
| [Description of Purchase Contracts](#tDOP) | [17](#tDOP) |
| [Description of Units](#tDOU) | [17](#tDOU) |
| &nbsp;&nbsp;[Forms of Securities](#tFOS) | [18](#tFOS) |
| [Selling Securityholders](#tSSH) | [20](#tSSH) |
| [Validity of Securities](#tVOS) | [20](#tVOS) |
| [Experts](#tEXP) | [20](#tEXP) |

---

i<br>

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#### THE COMPANY
Penumbra is a global healthcare company focused on innovative therapies. We design, develop, manufacture and market novel products and have a broad portfolio that addresses challenging medical conditions in markets with significant unmet need. Our team focuses on developing, manufacturing and marketing novel products for use by specialist physicians and healthcare providers to drive improved clinical and health outcomes. We believe that the cost-effectiveness of our products is attractive to our customers.

Since our founding in 2004, we have had a strong track record of organic product development and commercial expansion that has established the foundation of our global organization. We have successfully developed, obtained regulatory clearance or approval for, and introduced products into the neurovascular market since 2007, vascular market since 2013, neurosurgical market since 2014, and immersive healthcare market since 2020.

We expect to continue to develop and build our portfolio of products, including our thrombectomy, embolization, access and immersive healthcare technologies, while iterating on our currently available products. Generally, when we introduce a next generation product or a new product designed to replace a current product, sales of the earlier generation product or the product replaced decline. Our research and development activities are centered around the development of new products and clinical activities designed to support our regulatory submissions and demonstrate the effectiveness of our products.

We attribute our success to our culture built on cooperation, our highly efficient product innovation process, our disciplined approach to product and commercial development, our deep understanding of our target end markets and our relationships with specialist physicians and healthcare providers. We believe these factors have enabled us to rapidly innovate in a highly efficient manner.

We sell our products to healthcare providers primarily through our direct sales organization in the United States, most of Europe, Canada and Australia, as well as through distributors in select international markets. We generated revenue of $847.1 million, $747.6 million and $560.4 million for the years ended December 31, 2022, 2021 and 2020, respectively. This represents an annual increase of 13.3% and 33.4%, respectively. We generated income from operations of $6.1 million for the year ended December 31, 2022, and losses from operations of $7.5 million and $38.9 million for the years ended December 31, 2021 and 2020, respectively.

We were incorporated in 2004 as a Delaware corporation under the name Penumbra, Inc. Our principal executive offices are located at One Penumbra Place, Alameda, California, 94502 and our telephone number is (510) 748-3200. We maintain a website at www.penumbrainc.com. Information contained on our website or that can be accessed through our website is not incorporated by reference in, and does not constitute a part of, this prospectus.

#### About this Prospectus
This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission (the "SEC") utilizing a "shelf" registration process. Under this shelf process, we may sell any combination of the securities described in this prospectus in one or more offerings. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any prospectus supplement together with additional information described under the heading "Where You Can Find More Information."

We have filed or incorporated by reference exhibits to the registration statement of which this prospectus forms a part. You should read the exhibits carefully for provisions that may be important to you.

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#### **TABLE OF CONTENTS**

#### WHERE YOU CAN FIND MORE INFORMATION
We file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains an Internet site at http://www.sec.gov, that contains reports, proxy and information statements and other information we have filed electronically with the SEC.

The SEC allows us to "incorporate by reference" the information we file with them, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus, and information that we file later with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below and all documents we file pursuant to Section 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act") on or after the date of this prospectus and prior to the termination of the offering under this prospectus and any prospectus supplement (other than, in each case, documents or information deemed to have been furnished and not filed in accordance with SEC rules):

(a)<br> our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on [February 23, 2023](https://www.sec.gov/ix?doc=/Archives/edgar/data/1321732/000132173223000034/pen-20221231.htm); and

(b) the description of our common stock in our registration statement on Form 8-A filed with the SEC on [September 15, 2015](https://www.sec.gov/Archives/edgar/data/1321732/000119312515320347/d34997d8a12b.htm), including any amendment or report filed for the purpose of updating such description.

You may request a copy of these filings, at no cost, by writing or telephoning the office of Investor Relations, Penumbra, Inc., One Penumbra Place, Alameda, California, 94502, (510) 748-3200. Information about us, including copies of our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K filed with the SEC, is also available at our website at www.penumbrainc.com. However, the information on or accessible through our website is not a part of, or incorporated by reference in, this prospectus or any prospectus supplement that we file and should not be relied upon in determining whether to make an investment in our securities.

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#### SPECIAL NOTE ON FORWARD-LOOKING STATEMENTS
This prospectus, including the documents incorporated by reference herein, contains 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. In some cases, you can identify these statements by forward-looking words such as "may," "might," "will," "should," "expects," "plans," "anticipates," "believes," "estimates," "predicts," "potential" or "continue," the negative of these terms and other comparable terminology, but such words, terms and terminology are not the exclusive means for identifying such statements. These forward-looking statements, which are subject to risks, uncertainties and assumptions about us, may include projections of our future financial performance, our anticipated growth strategies and anticipated trends in our business. These statements are only predictions based on our current expectations and projections about future events. There are important factors that could cause our actual results, level of activity, performance or achievements to differ materially from the results, level of activity, performance or achievements expressed or implied by such forward-looking statements, including those factors discussed under the caption entitled "Risk Factors" in our Annual Report on Form 10-K for the year ended December 31, 2022.

Although we believe the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, level of activity, performance or achievements. Moreover, neither we nor any other person assume responsibility for the accuracy and completeness of any of these forward-looking statements. We undertake no obligation to update or revise any of these forward-looking statements after the date of this prospectus to conform our prior statements to actual results or revised expectations, except as required by law. You should, therefore, not rely on the forward-looking statements as representing our views as of any date subsequent to the date of this prospectus.

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#### **TABLE OF CONTENTS**

#### USE OF PROCEEDS
Unless otherwise indicated in a prospectus supplement, the net proceeds from the sale of the securities covered by this prospectus will be used for general corporate purposes, including working capital, continued development of our products, including research and development and clinical trials, potential acquisitions, and other business opportunities. We will not receive any proceeds from sales of securities offered by any selling securityholders pursuant to this prospectus.

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#### **TABLE OF CONTENTS**

#### DESCRIPTION OF CAPITAL STOCK
The following description of our capital stock is based upon our restated Certificate of Incorporation (the "Certificate of Incorporation"), our Second Amended and Restated Bylaws (the "Bylaws") and applicable provisions of law. We have summarized certain portions of the Certificate of Incorporation and Bylaws below. The summary is not complete. The Certificate of Incorporation and Bylaws are incorporated by reference as exhibits to the registration statement of which this prospectus forms a part. You should read the Certificate of Incorporation and Bylaws for the provisions that are important to you.

#### General
Our authorized capital stock consists of 300,000,000 shares of common stock, par value $0.001 per share, and 5,000,000 shares of undesignated preferred stock, par value $0.001 per share. As of February 9, 2023, there were 38,178,925 shares of common stock outstanding, which were held of record by 34 stockholders, and no shares of preferred stock outstanding. All outstanding shares of common stock are fully paid and non-assessable, and all of the shares of common stock or preferred stock that may be offered under this prospectus will be fully paid and non-assessable.

#### Common Stock
*Voting rights. The holders of common stock are entitled to one vote per share on all matters to be voted upon by the stockholders.*

*Dividend rights. Subject to preferences that may be applicable to any outstanding series of preferred stock, the holders of common stock are entitled to receive ratably such dividends, if any, as may be declared from time to time by the board of directors out of funds legally available therefor.*

*Rights upon liquidation. In the event of liquidation, dissolution or winding-up of Penumbra, the holders of common stock are entitled to share ratably in all assets remaining after payment of liabilities, subject to prior distribution rights of any series of preferred stock, if any, then outstanding.*

*Other rights. The holders of our common stock have no preemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to the common stock.*

*Listing. Our common stock is listed on the New York Stock Exchange under the symbol "PEN."*

*Transfer Agent. The transfer agent and registrar for our common stock is American Stock Transfer & Trust Company, LLC.*

#### Preferred Stock
Our board of directors has the authority to issue up to 5,000,000 shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof, including dividend rights, dividend rates, conversion rights, voting rights, terms of redemption, redemption prices, liquidation preferences and the number of shares constituting any series or the designation of such series, without further vote or action by the stockholders.

The existence of authorized but unissued and unreserved shares of capital stock may make it more difficult for or discourage an attempt by a potential acquirer to obtain control of our company by means of a merger, tender offer, proxy contest or otherwise, and the issuance of preferred stock may have the effect of delaying, deferring or preventing a change in control of Penumbra without further action by the stockholders. The issuance of preferred stock may also adversely affect the voting and other rights of the holders of common stock.

When we offer to sell a particular series of preferred stock, including preferred stock to be represented by depositary shares, we will describe the specific terms of the securities in a supplement to this prospectus. The preferred stock will be issued under a certificate of designations relating to each series of preferred stock and is also subject to the Certificate of Incorporation.

The transfer agent for each series of preferred stock and any exchange on which we plan to list a series of preferred stock will be described in the applicable prospectus supplement.

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#### Election and Removal of Directors
The Bylaws provide that our board of directors will consist of between five and nine directors. The exact number of directors will be fixed from time to time by resolution of the board, and is currently set at eight. No director may be removed except for cause, and directors may be removed for cause by an affirmative vote of shares representing a majority of the shares then entitled to vote at an election of directors. Any vacancy occurring on the board of directors and any newly created directorship may be filled only by a majority of the remaining directors in office.

#### Staggered Board
Our board of directors is divided into three classes serving staggered three-year terms. At each annual meeting of stockholders, directors will be elected to succeed the class of directors whose terms have expired. This classification of our board of directors could have the effect of increasing the length of time necessary to change the composition of a majority of the board of directors. In general, at least two annual meetings of stockholders will be necessary for stockholders to effect a change in a majority of the members of the board of directors.

#### Limits on Written Consents
The Certificate of Incorporation and Bylaws provide that holders of our common stock are not able to act by written consent without a meeting.

#### Stockholder Meetings
The Certificate of Incorporation and Bylaws provide that special meetings of our stockholders may be called only by our board of directors acting pursuant to a resolution adopted by a majority of the board of directors.

#### Amendment of Certificate of Incorporation
The provisions of the Certificate of Incorporation described under the sections titled "Common Stock—Voting rights," "Amendment of Bylaws," "Election and Removal of Directors," "Stockholder Meetings" and "Limits on Written Consents" may be amended only by the affirmative vote of holders of at least 66<sup>2</sup>∕3% of the voting power of our outstanding shares of voting stock, voting together as a single class. The affirmative vote of holders of at least a majority of the voting power of our outstanding shares of voting stock is generally required to amend other provisions of the Certificate of Incorporation.

#### Amendment of Bylaws
The Bylaws may generally be altered, amended or repealed, and new bylaws may be adopted, with:

&nbsp;&nbsp;&nbsp;&nbsp;• the affirmative vote of a majority of directors present at any regular or special meeting of the board of directors called for that purpose, or without a meeting if all members of the board of directors consent to the taking of the action; or

&nbsp;&nbsp;&nbsp;&nbsp;• the affirmative vote of holders of 66<sup>2</sup>∕ 3 % of the voting power of our outstanding shares of voting stock, voting together as a single class.

#### Other Limitations on Stockholder Actions
The Bylaws also impose procedural requirements on stockholders who wish to make nominations in the election of directors, propose any amendment to the Bylaws, or propose any other business to be brought before an annual or special meeting of stockholders.

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#### Limitation of Liability of Directors and Officers
The Certificate of Incorporation provides that no director will be personally liable to us or our stockholders for monetary damages for breach of fiduciary duty as a director, except as required by applicable law, as in effect from time to time. Currently, Delaware law requires that liability be imposed for the following:

&nbsp;&nbsp;&nbsp;&nbsp;• any breach of the director's duty of loyalty to our company or our stockholders;

&nbsp;&nbsp;&nbsp;&nbsp;• any act or omission not in good faith or which involved intentional misconduct or a knowing violation of law;

&nbsp;&nbsp;&nbsp;&nbsp;• unlawful payments of dividends or unlawful stock repurchases or redemptions as provided in Section 174 of the General Corporation Law of the State of Delaware (the "Delaware General Corporation Law"); and

&nbsp;&nbsp;&nbsp;&nbsp;• any transaction from which the director derived an improper personal benefit.

As a result, neither we nor our stockholders have the right, through stockholders' derivative suits on our behalf, to recover monetary damages against a director for breach of fiduciary duty as a director, including breaches resulting from grossly negligent behavior, except in the situations described above.

The Certificate of Incorporation also provides that, to the fullest extent permitted by law, we will indemnify any officer or director of our company against all damages, claims and liabilities arising out of the fact that the person is or was our director or officer, or served any other enterprise at our request as a director, officer, employee, agent or fiduciary. We will reimburse the expenses, including attorneys' fees, incurred by a person indemnified by this provision when we receive an undertaking to repay such amounts if it is ultimately determined that the person is not entitled to be indemnified by us. Amending this provision will not reduce our indemnification obligations relating to actions taken before an amendment.

#### Forum Selection
The Bylaws designate the state courts located within the state of Delaware (or if no state court located within Delaware has jurisdiction, the federal district court for the District of Delaware), in all cases subject to the court's having personal jurisdiction over the indispensable parties named as defendants, as the exclusive forum for any derivative action or proceeding brought on our behalf; any action asserting a claim of a breach of fiduciary duty; any action asserting a claim against us arising pursuant to the Delaware General Corporation Law, the Certificate of Incorporation or the Bylaws; or any action asserting a claim against us that is governed by the internal affairs doctrine. This forum selection provision will not apply to any causes of action arising under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act or, in each case, the rules and regulations thereunder, or for any other claim for which the U.S. federal courts have exclusive jurisdiction. Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock will be deemed to have notice of and consented to the foregoing forum selection provision.

#### Delaware Business Combination Statute
We have elected in the Certificate of Incorporation to be subject to Section 203 of the Delaware General Corporation Law ("Section 203"), which regulates corporate acquisitions. Section 203 prevents an "interested stockholder," which is defined generally as a person owning 15% or more of a corporation's voting stock, or any affiliate or associate of that person, from engaging in a broad range of "business combinations" with the corporation for three years after becoming an interested stockholder unless:

&nbsp;&nbsp;&nbsp;&nbsp;• the board of directors of the corporation had previously approved either the business combination or the transaction that resulted in the stockholder's becoming an interested stockholder;

&nbsp;&nbsp;&nbsp;&nbsp;• upon completion of the transaction that resulted in the stockholder's becoming an interested stockholder, that person owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, other than statutorily excluded shares; or

&nbsp;&nbsp;&nbsp;&nbsp;• following the transaction in which that person became an interested stockholder, the business combination is approved by the board of directors of the corporation and holders of at least two-thirds of the outstanding voting stock not owned by the interested stockholder.

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Under Section 203, the restrictions described above also do not apply to specific business combinations proposed by an interested stockholder following the announcement or notification of designated extraordinary transactions involving the corporation and a person who had not been an interested stockholder during the previous three years or who became an interested stockholder with the approval of a majority of the corporation's directors, if such extraordinary transaction is approved or not opposed by a majority of the directors who were directors prior to any person becoming an interested stockholder during the previous three years or were recommended for election or elected to succeed such directors by a majority of such directors.

Section 203 may make it more difficult for a person who would be an interested stockholder to effect various business combinations with a corporation for a three-year period. Section 203 also may have the effect of preventing changes in our management and could make it more difficult to accomplish transactions that our stockholders may otherwise deem to be in their best interests.

#### Anti-Takeover Effects of Some Provisions
Some provisions of the Certificate of Incorporation and Bylaws could make an acquisition of control of us by means of a proxy contest or otherwise more difficult, including those described above such as our staggered board and ability to issue preferred stock. These provisions are designed to discourage coercive takeover practices and inadequate takeover bids. These provisions are also designed to encourage persons seeking to acquire control of us to first negotiate with our board of directors. We believe that the benefits of increased protection give us the potential ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire or restructure us, and that the benefits of this increased protection outweigh the disadvantages of discouraging those proposals, because negotiation of those proposals could result in an improvement of their terms.

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#### DESCRIPTION OF DEPOSITARY SHARES REPRESENTING PREFERRED STOCK
The applicable prospectus supplement will include a description of the material terms of any depositary shares representing preferred stock offered hereby.

#### DESCRIPTION OF DEBT SECURITIES
The following descriptions of the debt securities that may be offered under this prospectus do not purport to be complete and are subject to and qualified in their entirety by reference to the indenture, a form of which has been incorporated by reference in the registration statement of which this prospectus is a part. Any future supplemental indenture or similar document also will be so filed. You should read the indenture and any supplemental indenture or similar document because they, and not this description, define your rights as holder of our debt securities. All capitalized terms have the meanings specified in the indenture.

As used in this prospectus, "debt securities" means the debentures, notes, bonds and other evidences of indebtedness that we may issue separately or upon exercise of a debt warrant from time to time. The debt securities may either be senior debt securities or subordinated debt securities. The debt securities we offer will be issued under an indenture between us and a trustee to be named therein. Debt securities, whether senior or subordinated, may be issued as convertible debt securities or exchangeable debt securities.

As used in this "Description of Debt Securities," the terms "Penumbra," "we," "our," and "us" refer to Penumbra, Inc. and do not, unless otherwise specified, include our subsidiaries.

#### General Terms of the Indenture
The debt securities will be our direct unsecured obligations. The senior debt securities will rank equally with all of our other senior unsecured and unsubordinated debt. The subordinated debt securities will be subordinate and junior in right of payment to all of our present and future senior indebtedness to the extent and in the manner described in the prospectus supplement and, if applicable, in a pricing supplement, and as set forth in the supplemental indenture, board resolution or officers' certificate relating to such offering.

The indenture does not limit the amount of debt securities that we may issue. It provides that we may issue debt securities up to the principal amount that we may authorize and may be in any currency or currency unit designated by us. Except for the limitations on consolidation, merger and sale of all or substantially all of our assets contained in the indenture, the terms of the indenture do not contain any covenants or other provisions designed to afford holders of any debt securities protection with respect to our operations, financial condition or transactions involving us.

We may issue the debt securities issued under the indenture as "discount securities," which means they may be sold at a discount below their stated principal amount. These debt securities, as well as other debt securities that are not issued at a discount, may, for U.S. federal income tax purposes, be treated as if they were issued with "original issue discount," because of interest payment and other characteristics. Special U.S. federal income tax considerations applicable to debt securities issued with original issue discount will be described in more detail in any applicable prospectus supplement or pricing supplement, if any.

The applicable prospectus supplement for a series of debt securities that we issue, together with a pricing supplement, if any, will describe, among other things, the following terms of the offered debt securities:

&nbsp;&nbsp;&nbsp;&nbsp;• the title;

&nbsp;&nbsp;&nbsp;&nbsp;• the aggregate principal amount;

&nbsp;&nbsp;&nbsp;&nbsp;• whether issued in fully registered form without coupons or in a form registered as to principal only with coupons or in bearer form with coupons;

&nbsp;&nbsp;&nbsp;&nbsp;• whether issued in the form of one or more global securities and whether all or a portion of the principal amount of the debt securities is represented thereby;

&nbsp;&nbsp;&nbsp;&nbsp;• the price or prices at which the debt securities will be issued;

&nbsp;&nbsp;&nbsp;&nbsp;• the date or dates on which principal is payable;

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&nbsp;&nbsp;&nbsp;&nbsp;• the place or places where and the manner in which principal, premium or interest will be payable and the place or places where the debt securities may be presented for transfer and, if applicable, conversion or exchange;

&nbsp;&nbsp;&nbsp;&nbsp;• interest rates, and the dates from which interest, if any, will accrue, and the dates when interest is payable;

&nbsp;&nbsp;&nbsp;&nbsp;• the right, if any, to extend the interest payment periods and the duration of the extensions;

&nbsp;&nbsp;&nbsp;&nbsp;• our rights or obligations to redeem or purchase the debt securities, including sinking fund or partial redemption payments;

&nbsp;&nbsp;&nbsp;&nbsp;• conversion or exchange provisions, if any, including conversion or exchange prices or rates and adjustments thereto;

&nbsp;&nbsp;&nbsp;&nbsp;• the currency or currencies of payment of principal or interest;

&nbsp;&nbsp;&nbsp;&nbsp;• the terms applicable to any debt securities issued at a discount from their stated principal amount;

&nbsp;&nbsp;&nbsp;&nbsp;• the terms, if any, pursuant to which any debt securities will be subordinate to any of our other debt;

&nbsp;&nbsp;&nbsp;&nbsp;• if the amount of payments of principal or interest is to be determined by reference to an index or formula, or based on a coin or currency other than that in which the debt securities are stated to be payable, the manner in which these amounts are determined and the calculation agent, if any, with respect thereto;

&nbsp;&nbsp;&nbsp;&nbsp;• if other than the entire principal amount of the debt securities when issued, the portion of the principal amount payable upon acceleration of maturity as a result of a default on our obligations;

&nbsp;&nbsp;&nbsp;&nbsp;• any provisions for the remarketing of the debt securities;

&nbsp;&nbsp;&nbsp;&nbsp;• if applicable, covenants affording holders of debt protection with respect to our operations, financial condition or transactions involving us; and

&nbsp;&nbsp;&nbsp;&nbsp;• any other specific terms of any debt securities.

The applicable prospectus supplement or pricing supplement, if any, will set forth certain U.S. federal income tax considerations for holders of any debt securities and the securities exchange or quotation system on which any debt securities are listed or quoted, if any.

Debt securities issued by us will be structurally subordinated to all indebtedness and other liabilities of our subsidiaries.

Unless otherwise provided in the applicable prospectus supplement, all securities of any one series need not be issued at the same time and may be issued from time to time without consent of any holder.

#### Subordination
The prospectus supplement or pricing supplement, if any, relating to any offering of subordinated debt securities will describe the specific subordination provisions, including the extent of subordination of payments by us of the principal of, premium, if any, and interest on such subordinated debt securities.

#### Conversion or Exchange Rights
Debt securities may be convertible into or exchangeable for our other securities or property. The terms and conditions of conversion or exchange will be set forth in the applicable prospectus supplement or pricing supplement, if any. The terms will include, among others, the following:

&nbsp;&nbsp;&nbsp;&nbsp;• the conversion or exchange price;

&nbsp;&nbsp;&nbsp;&nbsp;• the conversion or exchange period;

&nbsp;&nbsp;&nbsp;&nbsp;• provisions regarding the ability of us or the holder to convert or exchange the debt securities;

&nbsp;&nbsp;&nbsp;&nbsp;• events requiring adjustment to the conversion or exchange price; and

&nbsp;&nbsp;&nbsp;&nbsp;• provisions affecting conversion or exchange in the event of our redemption of the debt securities.

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#### Consolidation, Merger or Sale
We cannot consolidate with or merge into, or convey, transfer or lease all or substantially all of our properties and assets to, any person unless (1) we will be the continuing corporation or (2) the successor corporation or person to which our assets are conveyed, transferred or leased is a corporation, partnership, trust or other entity organized and validly existing under the laws of the United States, any state of the United States or the District of Columbia and it expressly assumes our obligations on the debt securities and under the indenture. In addition, we cannot effect such a transaction unless immediately after giving effect to such transaction, no default or event of default under the indenture shall have occurred and be continuing. Subject to certain exceptions, when the person to whom our assets are transferred or leased has assumed our obligations under the debt securities and the indenture, we shall be discharged from all our obligations under the debt securities and the indenture, except in limited circumstances.

This covenant would not apply to any recapitalization transaction, a change of control of us or a highly leveraged transaction, unless the transaction or change of control were structured to include a merger or consolidation or transfer or lease of all or substantially all of our assets.

#### Events of Default
Unless otherwise indicated, the term "Event of Default," when used in the indenture, means any of the following:

&nbsp;&nbsp;&nbsp;&nbsp;• failure to pay interest for 30 days after the date payment is due and payable; provided that, an extension of an interest payment period in accordance with the terms of the debt securities shall not constitute a failure to pay interest;

&nbsp;&nbsp;&nbsp;&nbsp;• failure to pay principal or premium, if any, on any debt security when due, either at maturity, upon any redemption, by declaration or otherwise;

&nbsp;&nbsp;&nbsp;&nbsp;• failure to make sinking fund payments when due;

&nbsp;&nbsp;&nbsp;&nbsp;• failure to perform any other covenant for 90 days after notice that performance was required;

&nbsp;&nbsp;&nbsp;&nbsp;• certain events relating to bankruptcy, insolvency or reorganization; or

&nbsp;&nbsp;&nbsp;&nbsp;• any other Event of Default provided in the applicable resolution of our board of directors or the officers' certificate or supplemental indenture under which we issue a series of debt securities.

An Event of Default for a particular series of debt securities does not necessarily constitute an Event of Default for any other series of debt securities issued under the indenture. If an Event of Default relating to the payment of interest, principal or any sinking fund installment involving any series of debt securities has occurred and is continuing, the trustee or the holders of not less than 25% in aggregate principal amount of the debt securities of each affected series may declare the entire principal of all the debt securities of that series to be due and payable immediately.

If an Event of Default relating to the performance of other covenants has occurred and is continuing for a period of 90 days after notice of such, or involves all of the series of senior debt securities, then the trustee or the holders of not less than 25% in aggregate principal amount of all of the series of senior debt securities may declare the entire principal amount of all of the series of senior debt securities due and payable immediately.

Similarly, if an Event of Default relating to the performance of other covenants has occurred and is continuing for a period of 90 days after notice of such, or involves all of the series of subordinated debt securities, then the trustee or the holders of not less than 25% in aggregate principal amount of all of the series of subordinated debt securities may declare the entire principal amount of all of the series of subordinated debt securities due and payable immediately.

If, however, the Event of Default relating to the performance of other covenants or any other Event of Default that has occurred and is continuing is for less than all of the series of senior debt securities or subordinated debt securities, as the case may be, then, the trustee or the holders of not less than 25% in aggregate principal amount of each affected series of the senior debt securities or the subordinated debt

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securities, as the case may be, may declare the entire principal amount of all debt securities of such affected series due and payable immediately. The holders of not less than a majority in aggregate principal amount of the debt securities of a series may, after satisfying conditions, rescind and annul any of the above-described declarations and consequences involving the series.

If an Event of Default relating to events in bankruptcy, insolvency or reorganization occurs and is continuing, then the principal amount of all of the debt securities outstanding, and any accrued interest, will automatically become due and payable immediately, without any declaration or other act by the trustee or any holder.

The indenture provides that the trustee shall within 90 days after the occurrence of default (or 30 days after it is known by the trustee) with respect to a particular series of debt securities, give the holders of the debt securities of such series notice of such default known to it; provided that, except in the case of a default or Event of Default in payment of the principal, premium, if any, of, or interest on, any debt security of such series or in the payment of any redemption obligation, the trustee may withhold the notice if, and so long as, it in good faith determines that withholding the notice is in the interests of the holders of debt securities of that series.

The indenture imposes limitations on suits brought by holders of debt securities against us. Except as provided below, no holder of debt securities of any series may institute any action against us under the indenture unless:

&nbsp;&nbsp;&nbsp;&nbsp;• the holder has previously given to the trustee written notice of default and the continuance of that default;

&nbsp;&nbsp;&nbsp;&nbsp;• the holders of at least 25% in principal amount of the outstanding debt securities of the affected series have requested that the trustee institute the action;

&nbsp;&nbsp;&nbsp;&nbsp;• the requesting holders have offered the trustee reasonable security or indemnity satisfactory to it for expenses and liabilities that may be incurred by bringing the action;

&nbsp;&nbsp;&nbsp;&nbsp;• the trustee has not instituted the action within 60 days of the request; and

&nbsp;&nbsp;&nbsp;&nbsp;• the trustee has not received inconsistent direction by the holders of a majority in principal amount of the outstanding debt securities of the series.

Notwithstanding the foregoing, each holder of debt securities of any series has the right, which is absolute and unconditional, to receive payment of the principal of and premium and interest, if any, on such debt securities when due and to institute suit for the enforcement of any such payment, and such rights may not be impaired without the consent of that holder of debt securities.

We will be required to file annually with the trustee a certificate, signed by one of our officers, stating whether or not the officer knows of any default by us in compliance with any condition or covenant of the indenture.

#### Registered Global Securities
We may issue the debt securities of a series in whole or in part in the form of one or more fully registered global securities that we will deposit with a depositary or with a nominee for a depositary identified in the applicable prospectus supplement or pricing supplement, if any, and registered in the name of such depositary or nominee. See "Forms of Securities."

We may also issue bearer debt securities of a series in the form of one or more global securities, referred to as "bearer global securities." We will deposit these bearer global securities with a common depositary for Euroclear Bank S.A./N.V., as operator of the Euroclear System, known as "Euroclear" and Clearstream Banking, société anonyme, Luxembourg, known as "Clearstream", or with a nominee for the depositary identified in the prospectus supplement or pricing supplement, if any, relating to that series. The prospectus supplement or pricing supplement, if any, relating to a series of debt securities represented by a bearer global security will describe the specific terms and procedures, including the specific terms of the depositary arrangement and any specific procedures for the issuance of debt securities in definitive form in exchange for a bearer global security, with respect to the portion of the series represented by a bearer global security.

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#### Discharge, Defeasance and Covenant Defeasance
We can discharge or defease our obligations under the indenture as set forth below. Unless otherwise set forth in the applicable prospectus supplement or pricing supplement, if any, the subordination provisions applicable to any subordinated debt securities will be expressly made subject to the discharge and defeasance provisions of the indenture.

We may discharge our obligations to holders of any series of debt securities that have not already been delivered to the trustee for cancellation and that have either become due and payable or are by their terms to become due and payable within one year (or are scheduled for redemption within one year). We may effect a discharge by irrevocably depositing with the trustee cash or U.S. government obligations or foreign government obligations, as applicable, as trust funds, in an amount certified to be sufficient to pay when due, whether at maturity, upon redemption or otherwise, the principal of, premium, if any, and interest on the debt securities and any mandatory sinking fund payments.

Unless otherwise provided in the applicable prospectus supplement or pricing supplement, if any, we may also discharge any and all of our obligations to holders of any series of debt securities at any time ("legal defeasance"). We also may be released from the obligations imposed by any covenants of any outstanding series of debt securities and provisions of the indenture, and we may omit to comply with those covenants without creating an Event of Default ("covenant defeasance"). We may effect legal defeasance and covenant defeasance only if, among other things:

&nbsp;&nbsp;&nbsp;&nbsp;• we irrevocably deposit with the trustee cash or U.S. government obligations or foreign government obligations, as applicable, as trust funds, in an amount certified to be sufficient to pay at maturity (or upon redemption) the principal, premium, if any, and interest on all outstanding debt securities of the series; and

&nbsp;&nbsp;&nbsp;&nbsp;• we deliver to the trustee an opinion of counsel from a nationally recognized law firm to the effect that the beneficial owners of the series of debt securities will not recognize income, gain or loss for U.S. federal income tax purposes as a result of the legal defeasance or covenant defeasance and that legal defeasance or covenant defeasance will not otherwise alter the beneficial owners' U.S. federal income tax treatment of principal, premium, if any, and interest payments on the series of debt securities, which opinion, in the case of legal defeasance, must be based on a ruling of the Internal Revenue Service issued, or a change in U.S. federal income tax law.

Although we may discharge or defease our obligations under the indenture as described in the two preceding paragraphs, we may not avoid, among other things, our duty to register the transfer or exchange of any series of debt securities, to replace any temporary, mutilated, destroyed, lost or stolen series of debt securities or to maintain an office or agency in respect of any series of debt securities.

#### Modification of the Indenture
The indenture provides that we and the trustee may enter into supplemental indentures without the consent of the holders of debt securities to:

&nbsp;&nbsp;&nbsp;&nbsp;• secure any debt securities;

&nbsp;&nbsp;&nbsp;&nbsp;• evidence the assumption by a successor corporation of our obligations;

&nbsp;&nbsp;&nbsp;&nbsp;• add covenants for the protection of the holders of debt securities;

&nbsp;&nbsp;&nbsp;&nbsp;• add one or more guarantees;

&nbsp;&nbsp;&nbsp;&nbsp;• cure any ambiguity or correct any inconsistency in the indenture;

&nbsp;&nbsp;&nbsp;&nbsp;• establish the forms or terms of debt securities of any series;

&nbsp;&nbsp;&nbsp;&nbsp;• conform any provision of the indenture to this description of debt securities, the description of the notes included in the applicable prospectus supplement or any other relevant section of the applicable prospectus supplement describing the terms of the debt securities;

&nbsp;&nbsp;&nbsp;&nbsp;• evidence and provide for the acceptance of appointment by a successor trustee;

&nbsp;&nbsp;&nbsp;&nbsp;• to provide for uncertificated debt securities in addition to or in place of certificated debt securities;

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&nbsp;&nbsp;&nbsp;&nbsp;• make any change that does not materially adversely affect the right of any holder; and

&nbsp;&nbsp;&nbsp;&nbsp;• comply with requirements of the SEC in order to effect or maintain the qualification of the indenture under the Trust Indenture Act of 1939, as amended.

The indenture also provides that we and the trustee may, with the consent of the holders of not less than a majority in aggregate principal amount of debt securities of all series of senior debt securities or subordinated debt securities, as the case may be, then outstanding and affected (voting as one class), add any provisions to, or change in any manner, or eliminate any of the provisions of, the indenture or any supplemental indenture or modify in any manner the rights of the holders of the affected debt securities.

We and the trustee may not, however, without the consent of the holder of each outstanding debt security affected thereby:

&nbsp;&nbsp;&nbsp;&nbsp;• extend the final maturity of any debt security;

&nbsp;&nbsp;&nbsp;&nbsp;• reduce the principal amount or premium, if any;

&nbsp;&nbsp;&nbsp;&nbsp;• reduce the rate or extend the time of payment of interest;

&nbsp;&nbsp;&nbsp;&nbsp;• reduce any amount payable on redemption;

&nbsp;&nbsp;&nbsp;&nbsp;• change the currency in which the principal (other than as may be provided otherwise with respect to a series), premium, if any, or interest is payable;

&nbsp;&nbsp;&nbsp;&nbsp;• reduce the amount of the principal of any debt security issued with an original issue discount that is payable upon acceleration or provable in bankruptcy;

&nbsp;&nbsp;&nbsp;&nbsp;• modify any of the subordination provisions or the definition of senior indebtedness applicable to any subordinated debt securities in a manner adverse to the holders of those securities;

&nbsp;&nbsp;&nbsp;&nbsp;• alter provisions of the indenture relating to the debt securities not denominated in U.S. dollars;

&nbsp;&nbsp;&nbsp;&nbsp;• impair the right to institute suit for the enforcement of any payment on any debt security when due;

&nbsp;&nbsp;&nbsp;&nbsp;• reduce the percentage of holders of debt securities of any series whose consent is required for any modification of the indenture, or the consent of whose holders is required for any waiver (of compliance with certain provisions of the indenture or certain defaults thereunder and their consequences) provided for in the indenture; or

&nbsp;&nbsp;&nbsp;&nbsp;• modify any provisions set forth in this paragraph.

#### Concerning the Trustee
The indenture provides that there may be more than one trustee under the indenture, each with respect to one or more series of debt securities. If there are different trustees for different series of debt securities, each trustee will be a trustee of a trust under the indenture separate and apart from the trust administered by any other trustee under the indenture. Except as otherwise indicated in this prospectus or any prospectus supplement, any action permitted to be taken by a trustee may be taken by such trustee only with respect to the one or more series of debt securities for which it is the trustee under the indenture. Any trustee under the indenture may resign or be removed with respect to one or more series of debt securities. All payments of principal of, premium, if any, and interest on, and all registration, transfer, exchange, authentication and delivery (including authentication and delivery on original issuance of the debt securities) of, the debt securities of a series will be effected by the trustee with respect to that series at an office designated by the trustee in New York, New York.

The indenture contains limitations on the right of the trustee, should it become a creditor of us, to obtain payment of claims in some cases or to realize on certain property received in respect of any such claim as security or otherwise. The trustee may engage in other transactions. If it acquires any conflicting interest relating to any duties with respect to the debt securities, however, it must eliminate the conflict or resign as trustee.

The holders of a majority in aggregate principal amount of any series of debt securities then outstanding will have the right to direct the time, method and place of conducting any proceeding for exercising any remedy available to the trustee with respect to such series of debt securities, provided that, the direction would not conflict with any rule of law or with the indenture, would not be unduly prejudicial to the rights of another

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holder of the debt securities, and would not involve any trustee in personal liability. The indenture provides that in case an Event of Default shall occur and be known to any trustee and not be cured, the trustee must use the same degree of care as a prudent person would use in the conduct of his or her own affairs in the exercise of the trustee's power. Subject to these provisions, the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request of any of the holders of the debt securities, unless they shall have offered to the trustee security and indemnity satisfactory to the trustee.

#### No Individual Liability of Incorporators, Stockholders, Officers or Directors
The indenture provides that no incorporator and no past, present or future stockholder, officer or director, of us or any successor corporation in their capacity as such shall have any individual liability for any of our obligations, covenants or agreements under the debt securities or the indenture.

#### Governing Law
The indenture and the debt securities will be governed by, and construed in accordance with, the laws of the State of New York, including, without limitation, Sections 5-1401 and 5-1402 of the New York General Obligations Law and New York Civil Practice Law and Rules 327(b).

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#### DESCRIPTION OF WARRANTS
We may issue warrants to purchase our debt or equity securities or securities of third parties or other rights, including rights to receive payment in cash or securities based on the value, rate or price of one or more specified commodities, currencies, securities or indices, or any combination of the foregoing. Warrants may be issued independently or together with any other securities and may be attached to, or separate from, such securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a warrant agent. The terms of any warrants to be issued and a description of the material provisions of the applicable warrant agreement will be set forth in the applicable prospectus supplement.

The applicable prospectus supplement will describe the following terms of any warrants in respect of which this prospectus is being delivered:

&nbsp;&nbsp;&nbsp;&nbsp;• the title of such warrants;

&nbsp;&nbsp;&nbsp;&nbsp;• the aggregate number of such warrants;

&nbsp;&nbsp;&nbsp;&nbsp;• the price or prices at which such warrants will be issued;

&nbsp;&nbsp;&nbsp;&nbsp;• the currency or currencies in which the price of such warrants will be payable;

&nbsp;&nbsp;&nbsp;&nbsp;• the securities or other rights, including rights to receive payment in cash or securities based on the value, rate or price of one or more specified commodities, currencies, securities or indices, or any combination of the foregoing, purchasable upon exercise of such warrants;

&nbsp;&nbsp;&nbsp;&nbsp;• the price at which and the currency or currencies in which the securities or other rights purchasable upon exercise of such warrants may be purchased;

&nbsp;&nbsp;&nbsp;&nbsp;• the date on which the right to exercise such warrants shall commence and the date on which such right shall expire;

&nbsp;&nbsp;&nbsp;&nbsp;• if applicable, the minimum or maximum amount of such warrants which may be exercised at any one time;

&nbsp;&nbsp;&nbsp;&nbsp;• if applicable, the designation and terms of the securities with which such warrants are issued and the number of such warrants issued with each such security;

&nbsp;&nbsp;&nbsp;&nbsp;• if applicable, the date on and after which such warrants and the related securities will be separately transferable;

&nbsp;&nbsp;&nbsp;&nbsp;• information with respect to book-entry procedures, if any;

&nbsp;&nbsp;&nbsp;&nbsp;• if applicable, a discussion of any material United States Federal income tax considerations; and

&nbsp;&nbsp;&nbsp;&nbsp;• any other terms of such warrants, including terms, procedures and limitations relating to the exchange and exercise of such warrants.

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#### DESCRIPTION OF PURCHASE CONTRACTS
We may issue purchase contracts for the purchase or sale of:

&nbsp;&nbsp;&nbsp;&nbsp;• debt or equity securities issued by us or securities of third parties, a basket of such securities, an index or indices or such securities or any combination of the above as specified in the applicable prospectus supplement;

&nbsp;&nbsp;&nbsp;&nbsp;• currencies; or

&nbsp;&nbsp;&nbsp;&nbsp;• commodities.

Each purchase contract will entitle the holder thereof to purchase or sell, and obligate us to sell or purchase, on specified dates, such securities, currencies or commodities at a specified purchase price, which may be based on a formula, all as set forth in the applicable prospectus supplement. We may, however, satisfy our obligations, if any, with respect to any purchase contract by delivering the cash value of such purchase contract or the cash value of the property otherwise deliverable or, in the case of purchase contracts on underlying currencies, by delivering the underlying currencies, as set forth in the applicable prospectus supplement. The applicable prospectus supplement will also specify the methods by which the holders may purchase or sell such securities, currencies or commodities and any acceleration, cancellation or termination provisions or other provisions relating to the settlement of a purchase contract.

The purchase contracts may require us to make periodic payments to the holders thereof or vice versa, which payments may be deferred to the extent set forth in the applicable prospectus supplement, and those payments may be unsecured or prefunded on some basis. The purchase contracts may require the holders thereof to secure their obligations in a specified manner to be described in the applicable prospectus supplement. Alternatively, purchase contracts may require holders to satisfy their obligations thereunder when the purchase contracts are issued. Our obligation to settle such pre-paid purchase contracts on the relevant settlement date may constitute indebtedness. Accordingly, pre-paid purchase contracts will be issued under either the senior indenture or the subordinated indenture.

#### DESCRIPTION OF UNITS
As specified in the applicable prospectus supplement, we may issue units consisting of one or more purchase contracts, warrants, debt securities, shares of preferred stock, shares of common stock or any combination of such securities. The applicable supplement will describe:

&nbsp;&nbsp;&nbsp;&nbsp;• the terms of the units and of the warrants, debt securities and common stock comprising the units, including whether and under what circumstances the securities comprising the units may be traded separately;

&nbsp;&nbsp;&nbsp;&nbsp;• a description of the terms of any unit agreement governing the units; and

&nbsp;&nbsp;&nbsp;&nbsp;• a description of the provisions for the payment, settlement, transfer or exchange of the units.

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#### FORMS OF SECURITIES
Each debt security, warrant and unit offered hereunder will be represented either by a certificate issued in definitive form to a particular investor or by one or more global securities representing the entire issuance of securities. Certificated securities in definitive form and global securities will be issued in registered form. Definitive securities name you or your nominee as the owner of the security, and in order to transfer or exchange these securities or to receive payments other than interest or other interim payments, you or your nominee must physically deliver the securities to the trustee, registrar, paying agent or other agent, as applicable. Global securities name a depositary or its nominee as the owner of the debt securities, warrants and units represented by these global securities. The depositary maintains a computerized system that will reflect each investor's beneficial ownership of the securities through an account maintained by the investor with its broker/dealer, bank, trust company or other representative, as we explain more fully below.

#### Global Securities
*Registered Global Securities. We may issue the registered debt securities, warrants and units offered under this prospectus in the form of one or more fully registered global securities that will be deposited with a depositary or its nominee identified in the applicable prospectus supplement and registered in the name of that depositary or nominee. In those cases, one or more registered global securities will be issued in a denomination or aggregate denominations equal to the portion of the aggregate principal or face amount of the securities to be represented by registered global securities. Unless and until it is exchanged in whole for securities in definitive registered form, a registered global security may not be transferred except as a whole by and among the depositary for the registered global security, the nominees of the depositary or any successors of the depositary or those nominees.*

If not described below, any specific terms of the depositary arrangement with respect to any securities to be represented by a registered global security will be described in the prospectus supplement relating to those securities. We anticipate that the following provisions will apply to all depositary arrangements.

Ownership of beneficial interests in a registered global security will be limited to persons, called participants, that have accounts with the depositary or persons that may hold interests through participants. Upon the issuance of a registered global security, the depositary will credit, on its book-entry registration and transfer system, the participants' accounts with the respective principal or face amounts of the securities beneficially owned by the participants. Any dealers, underwriters or agents participating in the distribution of the securities will designate the accounts to be credited. Ownership of beneficial interests in a registered global security will be shown on, and the transfer of ownership interests will be effected only through, records maintained by the depositary, with respect to interests of participants, and on the records of participants, with respect to interests of persons holding through participants. The laws of some states may require that some purchasers of securities take physical delivery of these securities in definitive form. These laws may impair your ability to own, transfer or pledge beneficial interests in registered global securities.

So long as the depositary, or its nominee, is the registered owner of a registered global security, that depositary or its nominee, as the case may be, will be considered the sole owner or holder of the securities represented by the registered global security for all purposes under the applicable indenture, warrant agreement, guaranteed trust preferred security or unit agreement. Except as described below, owners of beneficial interests in a registered global security will not be entitled to have the securities represented by the registered global security registered in their names, will not receive or be entitled to receive physical delivery of the securities in definitive form and will not be considered the owners or holders of the securities under the applicable indenture, warrant agreement, guaranteed trust preferred security or unit agreement. Accordingly, each person owning a beneficial interest in a registered global security must rely on the procedures of the depositary for that registered global security and, if that person is not a participant, on the procedures of the participant through which the person owns its interest, to exercise any rights of a holder under the applicable indenture, warrant agreement, guaranteed trust preferred security or unit agreement. We understand that under existing industry practices, if we request any action of holders or if an owner of a beneficial interest in a registered global security desires to give or take any action that a holder is entitled to give or take under the applicable indenture, warrant agreement, guaranteed trust preferred security or unit agreement, the depositary for the registered global security would authorize the participants holding the relevant beneficial interests to give or take that action, and the participants would authorize beneficial owners owning through them to give or take that action or would otherwise act upon the instructions of beneficial owners holding through them.

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Principal, premium, if any, and interest payments on debt securities, and any payments to holders with respect to warrants, guaranteed trust preferred securities or units, represented by a registered global security registered in the name of a depositary or its nominee will be made to the depositary or its nominee, as the case may be, as the registered owner of the registered global security. None of Penumbra, the trustees, the warrant agents, the unit agents or any other agent of Penumbra, agent of the trustees or agent of the warrant agents or unit agents will have any responsibility or liability for any aspect of the records relating to payments made on account of beneficial ownership interests in the registered global security or for maintaining, supervising or reviewing any records relating to those beneficial ownership interests.

We expect that the depositary for any of the securities represented by a registered global security, upon receipt of any payment of principal, premium, interest or other distribution of underlying securities or other property to holders on that registered global security, will immediately credit participants' accounts in amounts proportionate to their respective beneficial interests in that registered global security as shown on the records of the depositary. We also expect that payments by participants to owners of beneficial interests in a registered global security held through participants will be governed by standing customer instructions and customary practices, as is now the case with the securities held for the accounts of customers in bearer form or registered in "street name," and will be the responsibility of those participants.

If the depositary for any of these securities represented by a registered global security is at any time unwilling or unable to continue as depositary or ceases to be a clearing agency registered under the Exchange Act, and a successor depositary registered as a clearing agency under the Exchange Act is not appointed by us within 90 days, we will issue securities in definitive form in exchange for the registered global security that had been held by the depositary. Any securities issued in definitive form in exchange for a registered global security will be registered in the name or names that the depositary gives to the relevant trustee, warrant agent, unit agent or other relevant agent of ours or theirs. It is expected that the depositary's instructions will be based upon directions received by the depositary from participants with respect to ownership of beneficial interests in the registered global security that had been held by the depositary.

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#### SELLING SECURITYHOLDERS
Information about selling securityholders, if any, will be set forth in a prospectus supplement, in a post-effective amendment to the registration statement of which this prospectus is a part or in filings we make with the SEC under the Exchange Act, which are incorporated by reference herein.

#### VALIDITY OF SECURITIES
The validity of the securities in respect of which this prospectus is being delivered will be passed on for us by Davis Polk & Wardwell LLP, Menlo Park, California. Additional legal matters may be passed upon for us or any underwriters, dealers or agents by counsel that we will name in the applicable prospectus supplement.

#### EXPERTS
The consolidated financial statements of Penumbra, Inc. as of December 31, 2022 and 2021, and for each of the three years in the period ended December 31, 2022, incorporated by reference in this prospectus by reference to Penumbra, Inc.'s Annual Report on Form 10-K for the year ended December 31, 2022, and the effectiveness of Penumbra, Inc.'s internal control over financial reporting, have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report. Such consolidated financial statements are incorporated by reference in reliance upon the report of such firm given their authority as experts in accounting and auditing.

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#### PART II<br>

#### &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>

#### INFORMATION NOT REQUIRED IN PROSPECTUS

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| **Item 14.**<br>| **Other Expenses of Issuance and Distribution** |

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The following table sets forth the costs and expenses payable by the Registrant in connection with the sale of the securities being registered hereby.

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| | |
|:---|:---|
|  | **Amount to Be** <br>**Paid** |
| Registration fee | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;$\* |
| Printing | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\*\* |
| Legal fees and expenses (including Blue Sky fees) | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\*\* |
| Trustee fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\*\* |
| Rating Agency fees | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\*\* |
| Accounting fees and expenses  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\*\* |
| Miscellaneous  | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\*\* |
| TOTAL  | &nbsp;&nbsp;&nbsp;&nbsp;$\*\* |

---

\*<br> Omitted because the registration fee is being deferred pursuant to Rule 456(b) and 457(r).

\*\*<br> Omitted because these fees and expenses will depend on the securities offered and the number of issuances, and accordingly cannot be estimated at this time. The expenses of any offering will be set forth in the applicable prospectus supplement.

---

| | |
|:---|:---|
| **Item 15.**<br>| **Indemnification of Directors and Officers** |

---

Section 145 of the Delaware General Corporation Law provides that a corporation may indemnify directors and officers as well as other employees and individuals against expenses (including attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with any threatened, pending or completed actions, suits or proceedings in which such person is made a party by reason of such person being or having been a director, officer, employee or agent to the Registrant. The Delaware General Corporation Law provides that Section 145 is not exclusive of other rights to which those seeking indemnification may be entitled under any bylaw, agreement, vote of stockholders or disinterested directors or otherwise. Article VIII of the Registrant's Certificate of Incorporation provides for indemnification by the Registrant of its directors and officers to the fullest extent permitted by the Delaware General Corporation Law. In addition, the Registrant has entered into indemnification agreements with each of its current directors and executive officers to provide these directors and executive officers additional contractual assurances regarding the scope of the indemnification set forth in the Registrant's Certificate of Incorporation and to provide additional procedural protections. There is no pending litigation or proceeding involving a director or executive officer of the Registrant for which indemnification is sought.

Section 102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in its Certificate of Incorporation that a director of the corporation shall not be personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability (i) for any breach of the director's duty of loyalty to the corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) for unlawful payments of dividends or unlawful stock repurchases, redemptions or other distributions, or (iv) for any transaction from which the director derived an improper personal benefit. The Registrant's Certificate of Incorporation provides for such limitation of liability.

The Registrant maintains standard policies of insurance under which coverage is provided (a) to its directors and officers against loss rising from claims made by reason of breach of duty or other wrongful act, and (b) to the Registrant with respect to payments which may be made by the Registrant to such officers and directors pursuant to the above indemnification provisions or otherwise as a matter of law.

II-1<br>

------

#### **TABLE OF CONTENTS**

---

| | |
|:---|:---|
| **Item 16.**<br>| **Exhibits and Financial Statement Schedules** |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The following exhibits are filed as part of this Registration Statement:

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Exhibit** <br>**Number** | | **Incorporation by Reference** | **Incorporation by Reference** | **Incorporation by Reference** | **Incorporation by Reference** |
| **Exhibit** <br>**Number** | <br>**Description** | **Form** | **File No.** | **Exhibit(s)** | **Filing Date** |
| 1.1† | Form of Underwriting Agreement |  |  |  |  |
| [3.1](https://www.sec.gov/Archives/edgar/data/1321732/000095010315007749/dp60021_ex0303.htm) | Restated Certificate of Incorporation | 8-K | 001-37557 | 3.3 | September 29, 2015 |
| [3.2](https://www.sec.gov/Archives/edgar/data/1321732/000132173222000079/exhibit31secondamendedandr.htm) | Second Amended and Restated Bylaws | 8-K | 001-37557 | 3.1 | August 5, 2022 |
| [4.1](https://www.sec.gov/Archives/edgar/data/1321732/000119312515313456/d923792dex41.htm) | Specimen Common Stock Certificate | S-1/A | 333-206412 | 4.1 | September 8, 2015 |
| 4.2† | Specimen Preferred Stock Certificate |  |  |  |  |
| [4.3](https://www.sec.gov/Archives/edgar/data/1321732/000119312517082011/d337249dex43.htm) | Form of Indenture between the Registrant and the trustee to be named therein | S-3ASR | 333-216678 | 4.3 | March 14, 2017 |
| 4.4† | Form of Note |  |  |  |  |
| 4.5† | Form of Warrant Agreement |  |  |  |  |
| 4.6† | Form of Purchase Contract |  |  |  |  |
| 4.7† | Form of Unit Agreement |  |  |  |  |
| 4.8† | Form of Depositary Agreement |  |  |  |  |
| [5.1](ny20006606x1_ex5-1.htm) | Opinion of Davis Polk & Wardwell LLP |  |  |  |  |
| [23.1](ny20006606x1_ex23-1.htm) | Consent of Deloitte & Touche LLP |  |  |  |  |
| [23.2](ny20006606x1_ex5-1.htm) | Consent of Davis Polk & Wardwell LLP (included in Exhibit 5.1) |  |  |  |  |
| [24.1](#tPOA) | Power of Attorney (included on the signature page of the Registration Statement) |  |  |  |  |
| 25.1† | Statement of Eligibility on Form T-1 of the trustee to be named in the indenture included as Exhibit 4.3 |  |  |  |  |
| [107](ny20006606x1_ex107.htm) | Calculation of Filing Fee Table Form S-3 |  |  |  |  |

---

†<br> To be filed, if necessary, by amendment to this registration statement or in a Current Report on Form 8-K in connection with the issuance of the applicable securities.

---

| | |
|:---|:---|
| **Item 17.**<br>| **Undertakings** |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The undersigned Registrant hereby undertakes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) To file, during any period in which offers or sales are being made of securities registered hereby, a post-effective amendment to this registration statement:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Securities and Exchange Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set forth in the "Calculation of Registration Fee" table in the effective registration statement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;

*provided, however, that paragraphs (i), (ii) and (iii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in periodic reports filed* 

II-2<br>

------

with or furnished to the Securities and Exchange Commission by the Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in this registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered herein, and the offering of such securities at that time shall be deemed to be the initial *bona fide* offering thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(4) That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(A) Each prospectus filed by the Registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(B) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial *bona fide* offering thereof, *provided, however*, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5) That, for the purpose of determining liability of the Registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities:

The undersigned Registrant undertakes that in a primary offering of securities of the undersigned Registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned Registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) Any preliminary prospectus or prospectus of the undersigned Registrant relating to the offering required to be filed pursuant to Rule 424;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned Registrant or used or referred to by the undersigned Registrant;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) The portion of any other free writing prospectus relating to the offering containing material information about the undersigned Registrant or its securities provided by or on behalf of the undersigned Registrant; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) Any other communication that is an offer in the offering made by the undersigned Registrant to the purchaser.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's

II-3<br>

------

annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the Registrants pursuant to the foregoing provisions, or otherwise, the Registrants have been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrants will, unless in the opinion of their counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) The undersigned Registrant hereby undertakes to file an application for the purpose of determining the eligibility of the trustee to act under subsection (a) of Section 310 of the Trust Indenture Act in accordance with the rules and regulations prescribed by the Securities and Exchange Commission under Section 305(b)(2) of the Trust Indenture Act.

II-4<br>

------

#### SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Alameda, State of California, on this 23<sup>rd</sup> day of February, 2023.

---

| | | |
|:---|:---|:---|
| PENUMBRA, INC. | PENUMBRA, INC. | PENUMBRA, INC. |
| By: | /s/ Adam Elsesser | /s/ Adam Elsesser |
|  | Name: | Adam Elsesser |
|  | Title: | Chief Executive Officer and President |

---

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Adam Elsesser and Johanna Roberts, and each of them, his or her true and lawful attorneys-in-fact and agents, with full power to act separately and full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this registration statement and to file the same, with all exhibits thereto, and all other documents in connection therewith, with the Securities and Exchange Commission, granting unto each said attorney-in-fact and agent full power and authority to do and perform each and every act in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or either of them or his or her or their substitute or substitutes may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

---

| | | |
|:---|:---|:---|
| **Signature** | **Title** | **Date** |
| /s/ Adam Elsesser | Chairman, Chief Executive Officer and <br>President<br>(Principal Executive Officer)  | February 23, 2023 |
| Adam Elsesser | Chairman, Chief Executive Officer and <br>President<br>(Principal Executive Officer)  | February 23, 2023 |
| /s/ Maggie Yuen | Chief Financial Officer<br>(Principal Financial Officer) | February 23, 2023 |
| Maggie Yuen | Chief Financial Officer<br>(Principal Financial Officer) | February 23, 2023 |
| /s/ Lambert Shiu | Chief Accounting Officer<br>(Principal Accounting Officer) | February 23, 2023 |
| Lambert Shiu | Chief Accounting Officer<br>(Principal Accounting Officer) | February 23, 2023 |
| /s/ Arani Bose | Director | February 23, 2023 |
| Arani Bose | Director | February 23, 2023 |
| /s/ Don Kassing | Director | February 23, 2023 |
| Don Kassing | Director | February 23, 2023 |
| /s/ Harpreet Grewal | Director | February 23, 2023 |
| Harpreet Grewal | Director | February 23, 2023 |
| /s/ Thomas C. Wilder | Director | February 23, 2023 |
| Thomas C. Wilder | Director | February 23, 2023 |
| /s/ Bridget O'Rourke | Director | February 23, 2023 |
| Bridget O'Rourke | Director | February 23, 2023 |
| /s/ Janet Leeds | Director | February 23, 2023 |
| Janet Leeds | Director | February 23, 2023 |
| /s/ Surbhi Sarna | Director | February 23, 2023 |
| Surbhi Sarna | Director | February 23, 2023 |

---

II-5<br>

## Exhibit 5.1

####  

#### Exhibit 5.1

---

| | | |
|:---|:---|:---|
|  |  | **DRAFT** |
| ![](image0.jpg) | Davis Polk & Wardwell llp<br> 1600 El Camino Real<br> Menlo Park, CA 94025<br> davispolk.com | |

---

February 23, 2023

Penumbra, Inc.

One Penumbra Place

Alameda, California 94502

Ladies and Gentlemen:

Penumbra, Inc., a Delaware corporation (the "**Company**"), is filing with the Securities and Exchange Commission a Registration Statement on Form S-3 (the "**Registration Statement**") for the purpose of registering under the Securities Act of 1933, as amended (the "**Securities Act**"), (a) shares of common stock, par value $0.001 per share (the "**Common Stock**"), of the Company; (b) shares of preferred stock, par value $0.001 per share (the "**Preferred Stock**"), of the Company; (c) the Company's debt securities (the "**Debt Securities**"), which may be senior debt securities or subordinated debt securities and which may be issued pursuant to an indenture, between the Company and the trustee or trustees to be named therein, as trustee (the "**Trustee**") (the "**Indenture**"); (d) warrants of the Company (the "**Warrants**"), which may be issued under one or more warrant agreements (each, a "**Warrant Agreement**") to be entered into between the Company and the warrant agent to be named therein (the "**Warrant Agent**"); (e) purchase contracts (the "**Purchase Contracts**") which may be issued under one or more purchase contract agreements (each, a "**Purchase Contract Agreement**") to be entered into between the Company and the purchase contract agent to be named therein (the "**Purchase Contract Agent**"); (f) units (the "**Units**") to be issued under one or more unit agreements to be entered into among the Company, a bank or trust company, as unit agent (the "**Unit Agent**"), and the holders from time to time of the Units (each such unit agreement, a "**Unit Agreement**"); and (g) depositary shares representing fractional interests in shares or multiple shares of the Preferred Stock (the "**Depositary Shares**"), which may be issued under one or more preferred stock depositary agreements (each, a "**Depositary Agreement**") to be entered into between the Company and the preferred stock depositary to be named therein (the "**Depositary**").

We, as your counsel, have examined originals or copies of such documents, corporate records, certificates of public officials and other instruments as we have deemed necessary or advisable for the purpose of rendering this opinion.

In rendering the opinions expressed herein, we have, without independent inquiry or investigation, assumed that (i) all documents submitted to us as originals are authentic and complete, (ii) all documents submitted to us as copies conform to authentic, complete originals, (iii) all documents filed as exhibits to the Registration Statement that have not been executed will conform to the forms thereof, (iv) all signatures on all documents that we reviewed are genuine, (v) all natural persons executing documents had and have the legal capacity to do so, (vi) all statements in certificates of public officials and officers of the Company that we reviewed were

------

and are accurate and (vii) all representations made by the Company as to matters of fact in the documents that we reviewed were and are accurate.

Based upon the foregoing, and subject to the additional assumptions and qualifications set forth below, we advise you that, in our opinion:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. When the necessary corporate action on the part of the Company has been taken to authorize the issuance and sale of such shares of Common Stock proposed to be sold by the
 Company, and when such shares of Common Stock are issued and delivered in accordance with the applicable underwriting or other agreement against payment therefor (in excess of par value thereof) or upon conversion or exercise of any security
 offered under the Registration Statement (the "**Offered Security** "), in accordance with the terms of such Offered Security or the instrument
 governing such Offered Security providing for such conversion or exercise as approved by the Board of Directors of the Company, for the consideration approved by such Board of Directors (which consideration is not less than the par value of the
 Common Stock), such shares of Common Stock will be validly issued, fully-paid and non-assessable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. Upon designation of the relative rights, preferences and limitations of any series of Preferred Stock by the Board of Directors of the Company and the proper filing with
 the Secretary of State of the State of Delaware of a Certificate of Designation relating to such series of Preferred Stock, when all necessary corporate action on the part of the Company has been taken to authorize the issuance and sale of such
 series of Preferred Stock proposed to be sold by the Company, and when such shares of Preferred Stock are issued and delivered in accordance with the applicable underwriting or other agreement against payment therefor (in excess of par value
 thereof), such shares of Preferred Stock will be validly issued, fully paid and non-assessable.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. When the Indenture and any supplemental indenture to be entered into in connection with the issuance of any Debt Securities have been duly authorized, executed and
 delivered by the Trustee and the Company; the specific terms of a particular series of Debt Securities have been duly authorized and established in accordance with the Indenture; and such Debt Securities have been duly authorized, executed,
 authenticated, issued and delivered in accordance with the Indenture and the applicable underwriting or other agreement against payment therefor, such Debt Securities will constitute valid and binding obligations of the Company, enforceable in
 accordance with their terms, subject to applicable bankruptcy, insolvency and similar laws affecting creditors' rights generally, concepts of reasonableness and equitable principles of general applicability, provided that we express no opinion
 as to (w) the enforceability of any waiver of rights under any usury or stay law, (x) the effect of fraudulent conveyance, fraudulent transfer or similar provision of applicable law on the conclusions expressed above, (y) the validity, legally
 binding effect or enforceability of any provision of the Indenture or any supplemental indenture that requires or relates to adjustments to the conversion rate at a rate or in an amount that a court would determine in the circumstances under
 applicable law to be commercially unreasonable or a penalty or forfeiture or (z) the validity, legally binding effect or enforceability of any provision that permits holders to collect any portion of stated principal amount upon acceleration of
 the Debt Securities to the extent determined to constitute unearned interest.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4. When the Warrant Agreement to be entered into in connection with the issuance of any Warrants has been duly authorized, executed and delivered by the Warrant Agent and
 the Company; the specific terms of the Warrants have been duly authorized and established in accordance with the Warrant Agreement; and such Warrants have been duly authorized, executed, issued and delivered in accordance with the Warrant
 Agreement and the applicable underwriting or other agreement against payment therefor, such Warrants will constitute valid and binding obligations of the Company, enforceable in accordance with their terms, subject to applicable bankruptcy,
 insolvency and similar laws affecting creditors' rights generally, concepts of reasonableness and equitable principles of general applicability.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5. When the Purchase Contract Agreement to be entered into in connection with the issuance of any Purchase Contracts has been duly authorized, executed and delivered by the
 Purchase Contract Agent and the Company; the specific terms of the Purchase Contracts have been duly authorized and established in accordance with the Purchase Contract Agreement; and such Purchase Contracts have been duly authorized, executed,
 issued and delivered in accordance with the Purchase Contract Agreement and the applicable underwriting or other agreement against payment therefor, such Purchase Contracts will constitute valid and binding obligations of the Company,
 enforceable in accordance with their terms, subject to applicable bankruptcy, insolvency and similar laws affecting creditors' rights generally, concepts of reasonableness and equitable principles of general applicability.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6. When the Unit Agreement to be entered into in connection with the issuance of any Units has been duly authorized, executed and delivered by the Unit Agent and the
 Company; the specific terms of the Units have been duly authorized and established in accordance with the Unit Agreement; and such Units have been duly authorized, executed, issued and delivered in accordance with the Unit Agreement and the
 applicable underwriting or other agreement against payment therefor, such Units will constitute valid and binding obligations of the Company, enforceable in accordance with their terms, subject to applicable bankruptcy, insolvency and similar
 laws affecting creditors' rights generally, concepts of reasonableness and equitable principles of general applicability.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7. When the Depositary Agreement to be entered into in connection with the issuance of any Depositary Shares has been duly authorized, executed and delivered by the
 Depositary and the Company; the specific terms of the Depositary Shares have been duly authorized and established in accordance with the Depositary Agreement; and such Depositary Shares have been duly authorized, executed, issued and delivered
 in accordance with the Depositary Agreement and the applicable underwriting or other agreement against payment therefor, such Depositary Shares will constitute legal and valid interests in the corresponding shares of Preferred Stock, subject to
 applicable bankruptcy, insolvency and similar laws affecting creditors' rights generally, concepts of reasonableness and equitable principles of general applicability.

In connection with the opinions expressed above, we have assumed that, at or prior to the time of the delivery of any such security, (i) the Board of Directors of the Company shall have duly established the terms of such security and duly authorized the issuance and sale of such security and such authorization shall not have been modified or rescinded; (ii) the Company shall remain validly existing as a corporation in good standing under the laws of the State of Delaware; (iii) the

------

Registration Statement shall have become effective and such effectiveness shall not have been terminated or rescinded; (iv) the Indenture, the Debt Securities, the Warrant Agreement, the Purchase Contract Agreement, the Unit Agreement and the Depositary Agreement are each valid, binding and enforceable agreements of each party thereto (other than as expressly covered above in respect of the Company); and (v) there shall not have occurred any change in law affecting the validity or enforceability of such security. We have also assumed that (i) the terms of any security whose terms are established subsequent to the date hereof and the issuance, execution, delivery and performance by the Company of any such security (a) require no action by or in respect of, or filing with, any governmental body, agency or official and (b) do not contravene, or constitute a default under, any provision of applicable law or public policy or regulation or any judgment, injunction, order or decree or any agreement or other instrument binding upon the Company and (ii) any Warrant Agreement, Purchase Contract Agreement and Unit Agreement will be governed by the laws of the State of New York.

We are members of the Bars of the States of New York and California and the foregoing opinion is limited to the laws of the State of New York and the General Corporation Law of the State of Delaware.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement referred to above and further consent to the reference to our name under the caption "Validity of Securities" in the prospectus, which is a part of the Registration Statement. In giving this consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act.

Very truly yours,

/s/ Davis Polk & Wardwell LLP

------

## Exhibit 23.1

#### Exhibit 23.1<br>

#### CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated February 23, 2023 relating to the consolidated financial statements of Penumbra, Inc. and subsidiaries (the "Company") and the effectiveness of the Company's internal control over financial reporting, appearing in the Annual Report on Form 10-K of Penumbra, Inc. for the year ended December 31, 2022. We also consent to the reference to us under the heading "Experts" in such Registration Statement.

/s/ Deloitte & Touche LLP

San Francisco, California

February 23, 2023

------

## Ex-Filing

#### Exhibit 107

#### Calculation of Filing Fee Table

#### Form S-3
(Form Type)

#### Penumbra, Inc.
(Exact Name of Registrant as Specified in its Charter)

<u>Table 1: Newly Registered and Carry Forward Securities</u>

---

| | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Security Type** | **Security Class Title** <sup>(2)</sup> | **Fee Calculation or Carry Forward Rule** | &nbsp;&nbsp; **Amount Registered** | **Proposed Maximum Offering Price Per Unit** | **Maximum Aggregate Offering Price** | **Amount of Registration Fee** | **Carry Forward Form Type** | **Carry Forward File Number** | **Carry Forward Initial effective date** | **Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward** |
| **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** | **Newly Registered Securities** |
| &nbsp;&nbsp; Fees to Be<br> Paid | Equity | Common Stock, par value $0.001 per share | Rule 456(b) and Rule 457(r)<sup>(1)</sup> | <sup>(2)</sup> | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp; Fees to Be<br> Paid | Equity | Preferred Stock, par value $0.001 per share | Rule 456(b) and Rule 457(r)<sup>(1)</sup> | <sup>(2)</sup> | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp; Fees to Be<br> Paid | Equity | Depositary Shares | Rule 456(b) and Rule 457(r)<sup>(1)</sup> | <sup>(2)</sup> | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp; Fees to Be<br> Paid | Debt | Debt Securities | Rule 456(b) and Rule 457(r)<sup>(1)</sup> | <sup>(2)</sup> | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp; Fees to Be<br> Paid | Other | Warrants | Rule 456(b) and Rule 457(r)<sup>(1)</sup> | <sup>(2)</sup> | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp; Fees to Be<br> Paid | Other | Purchase Contracts | Rule 456(b) and Rule 457(r)<sup>(1)</sup> | <sup>(2)</sup> | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp; Fees to Be<br> Paid | Other | Units | Rule 456(b) and Rule 457(r)<sup>(1)</sup> | <sup>(2)</sup> | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| &nbsp;&nbsp; Fees<br> Previously Paid | N/A | N/A | N/A | N/A | N/A | N/A | N/A |  |  |  |  |
| **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** | **Carry Forward Securities** |
| &nbsp;&nbsp;&nbsp;&nbsp; Carry<br> Forward Securities | N/A | N/A | N/A | N/A |  | N/A |  | N/A | N/A | N/A | N/A |
| **Total Offering Amounts** | **Total Offering Amounts** | **Total Offering Amounts** | **Total Offering Amounts** | **Total Offering Amounts** | <sup>(2)</sup> | <sup>(2)</sup><br> <sup>(1)</sup> | <sup>(1)</sup> |  |  |  |  |
| **Total Fees Previously Paid** | **Total Fees Previously Paid** | **Total Fees Previously Paid** | **Total Fees Previously Paid** | **Total Fees Previously Paid** |  |  | N/A |  |  |  |  |
| **Total Fee Offsets** | **Total Fee Offsets** | **Total Fee Offsets** | **Total Fee Offsets** | **Total Fee Offsets** |  |  | N/A |  |  |  |  |
| **Net Fee Due** | **Net Fee Due** | **Net Fee Due** | **Net Fee Due** | **Net Fee Due** |  |  | <sup>(1)</sup> |  |  |  |  |

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(1) In accordance with Rules 456(b) and 457(r) under the Securities Act of 1933, as amended (the "Securities Act"), the Registrant is deferring payment of all of the registration fee. In connection with the securities offered hereby, the Registrant will pay "pay-as-you-go registration fees" in accordance with Rule 456(b). The Registrant will calculate the registration fee applicable to an offer of securities pursuant to this Registration Statement based on the fee payment rate in effect on the date of such fee payment.

(2) An indeterminate aggregate amount or number of securities of each class is being registered hereunder, as may from time to time be offered, at indeterminate prices. Securities registered hereunder may be sold separately, together or as units with other securities registered hereunder. The indeterminate aggregate amount or number also includes such securities as may, from time to time, be issued upon conversion or exchange of securities registered hereunder, to the extent any such securities are, by their terms, convertible into or exchangeable for other securities.

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