As filed with the Securities and Exchange Commission on July 26, 201828, 2020
Registration No. 333-

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM S-3
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933    
__________________

NewLink Genetics CorporationLumos Pharma, Inc.
(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of incorporation or organization)
42-1491350
(I.R.S. Employer Identification Number)

2503 South Loop Drive4200 Marathon Blvd., Suite 200
Ames, Iowa 50010Austin, Texas 78756
(515) 296-5555(512) 215-2630
(Address, including zip code, and telephone number, including area code of registrant’s principal executive offices)
__________________

CharlesRichard J. Link, Jr.Hawkins
Chief Executive Officer
NewLink Genetics CorporationLumos Pharma, Inc.
2503 South Loop Drive4200 Marathon Blvd., Suite 200
Ames, Iowa 50010Austin, Texas 78756
(515) 296-5555(512) 215-2630
(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:
James C.T. LinfieldJ. Robert Suffoletta, Esq.
Kassendra D. GalindoWilson Sonsini Goodrich & Rosati, Professional Corporation
Cooley LLP900 S. Capital of Texas Highway
380 Interlocken CrescentLaw Cimas IV, Fifth Floor
Broomfield, CO 80021Austin, Texas 78746
(720) 566-4000(512) 338-5400
_____________________
Approximate date of commencement of proposed sale to the public:From time to time after the effective date of this Registration Statement
(Approximate date of commencement of proposed sale to the public)
_____________________registration statement.
If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.   o
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.x
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.   o
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.   o
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.   o
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.   o



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.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting 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     o                         Accelerated filer         xo
Non-accelerated filer     o (Do not check if a smaller reporting company)x                        Smaller reporting company     ox
Emerging growth company     o
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.Act   o
__________________


CALCULATION OF REGISTRATION FEE

Title of Each Class of
Securities to be Registered
Amount to be RegisteredProposed Maximum Offering Price per UnitProposed Maximum Aggregate Offering Price
Amount of Registration Fee(1)
Common Stock, par value $0.01 per share(2)(3)(3)
Preferred Stock, par value $0.01 per share(2)(3)(3)
Debt Securities(2)(3)(3)
Warrants(2)(3)(3)
  Total(2) $250,000,000$31,125
Title of Each Class of
Securities to be Registered
Amount to be Registered (1)Proposed Maximum Offering Price per Share (2)Proposed Maximum Aggregate Offering Price (2)Amount of Registration Fee (3)
Common Stock, par value $0.01 per share4,146,398$14.81$61,408,154.38$7,970.78

(1)The shares will be offered for resale by selling stockholders. Pursuant to Rule 415(a)(6) under416(a) of the Securities Act the registrant is carrying forward toof 1933, as amended, this registration statement $171,565,336.00 in aggregate offering price of securities that were previously registered on registration statement no. 333-205234Registration Statement shall also cover any additional shares of the registrant and registration feesRegistrant’s common stock that become issuable by reason of $19,935.89any stock dividend, stock split, recapitalization or other similar transaction effected without receipt of consideration that were previously paid in connection with those securities pursuant to Rule 457(o).increases the number of the Registrant’s outstanding shares of common stock.
(2)There are being registered hereunder such indeterminate numberEstimated solely for the purpose of shares of common stock and preferred stock, such indeterminate principal amount of debt securities and such indeterminate number of warrants to purchase common stock, preferred stock or debt securities as shall have an aggregate initial offering price not to exceed $250,000,000. If any debt securities are issued at an original issue discount, thencalculating the principal amount of such debt securities shall be in such greater amount as shall result in an aggregate initial offering price not to exceed $250,000,000, less the aggregate dollar amount of all securities previously issued hereunder. Any securities registered hereunder may be sold separately or in combination with other securities registered hereunder. The securities registered also include such indeterminate number of shares of common stock and preferred stock and amount of debt securities as may be issued upon conversion of or exchange for preferred stock or debt securities that provide for conversion or exchange, upon exercise of warrants or pursuant to the antidilution provisions of any such securities. In addition, pursuantregistration fee according to Rule 416457(c) under the Securities Act based on the shares being registered hereunder include such indeterminate numberaverage of sharesthe high ($15.21) and low ($14.40) prices of the Registrant’s common stock and preferred stock as may be issuable with respectreported on the Nasdaq Global Market on July 27, 2020, which is within five business days prior to the shares being registered hereunder as a result of stock splits, stock dividends or similar transactions.filing this Registration Statement.
(3)The proposed maximum aggregate offering price per classRegistrant previously paid a registration fee of security will be determined from time$7,362.61 in connection with a withdrawn registration statement on Form S-3 originally filed with the Securities and Exchange Commission on June 12, 2020 (File No. 333-239137) (the “Withdrawn S-3”). The Withdrawn S-3 was not declared effective and no securities were sold thereunder. Pursuant to time byRule 457(p) under the registrantSecurities Act, the Registrant hereby offsets the full registration fee previously paid in connection with the issuance byWithdrawn S-3 against the registrantfull registration fee that is currently due in connection with this filing. Accordingly, the remaining registration fee balance of the securities registered hereunder and is not specified as to each class of security pursuant to General Instruction II.D. of Form S-3 under the Securities Act.$608.17 has been paid herewith.

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment that specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act or until the registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.







The information in this prospectus is not complete and may be changed. We may not sell these securities or accept an offer to buy these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities, and it is not soliciting offers to buy these securities in any state where such offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED July 26, 2018JULY 28, 2020
PROSPECTUS

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$250,000,000
4,146,398 Shares of Common Stock
Preferred Stock
Debt Securities
Warrants

FromThis prospectus relates to the resale from time to time we may offerof up to $250,000,0004,146,398shares of any combinationcommon stock of Lumos Pharma, Inc. (the “Company,” “we,” “us” or “ours”), formerly known as NewLink Genetics Corporation (“NewLink”), by the securities described in this prospectus in oneselling stockholders listed on page 3. Such shares were issued or more offerings. We may also offer securities as may beare issuable upon conversion, redemption, repurchase, exchange or exercise of any securities registered hereunder, including any applicable antidilution provisions.
This prospectus provides a general description ofto the securities we may offer. Each time we offer securities, we will provide specificselling stockholders pursuant to the terms of the securities offered inAgreement and Plan of Merger and Reorganization, dated as of September 30, 2019, by and among the Company, Cyclone Merger Sub, Inc., a supplement to this prospectus. We may also authorize one or more free writing prospectuses to be provided to you in connection with these offerings. The prospectus supplement and any related free writing prospectus may also add, update or change information contained in this prospectus. You should carefully read this prospectus, the applicable prospectus supplement and any related free writing prospectus, as well as any documents incorporated by reference, before you invest in anywholly-owned subsidiary of the securities being offered.
This prospectus may not be usedCompany (“Merger Sub”), and Lumos Pharma Sub, Inc., formerly known as Lumos Pharma, Inc. (“Private Lumos”) (as amended, the “Merger Agreement”), pursuant to consummatewhich Merger Sub merged with and into Private Lumos, with Private Lumos surviving as a salewholly-owned subsidiary of any securities unless accompanied bythe Company (the “Merger”). As a prospectus supplement.
Ourresult of the Merger, the outstanding shares of common stock is listed on The Nasdaq Global Market, or Nasdaq, underand preferred stock of Private Lumos were converted into the symbol “NLNK.” On July 25, 2018, the last reported sale priceright to receive shares of our common stock was $4.41 per share. The applicable prospectus supplement will contain information, where applicable, ason the terms set forth in the Merger Agreement. For accounting purposes, Private Lumos is considered to any other listing on Nasdaq or any securities market or other exchange ofhave acquired NewLink Genetics Corporation in the securities, if any, covered by the prospectus supplement.Merger.
We will sellnot receive any proceeds from the sale of the shares offered by this prospectus.
Pursuant to the terms of the Merger Agreement, we are required to file this registration statement to register the sale, resale or other distribution of the shares of our common stock received by the Private Lumos stockholders in the Merger and we will bear all of the expenses incurred in connection with the registration of these securities directly to investors, through agents designatedshares. The selling stockholders will pay or assume discounts, commissions, fees of underwriters, selling brokers or dealer managers and similar expenses, if any, incurred for the sale of shares of our common stock.
The selling stockholders identified in this prospectus may offer the shares from time to time through public or private transactions at prevailing market prices, at prices related to prevailing market prices or through underwriters or dealers, on a continuous or delayed basis.at privately negotiated prices. For additional information on the methods of sale you should refer tothat may be used by the selling stockholders, see the section titledentitled “Plan of Distribution” in this prospectus. If any agentson page 6. For a list of the selling stockholders, see the section entitled “Selling Stockholders” on page 3.
We may amend or underwriters are involved in the sale of any securities with respect to whichsupplement this prospectus is being delivered,from time to time by filing amendments or supplements as required. You should read the names of such agents or underwritersentire prospectus and any applicable fees, commissions, discountsamendments or over-allotment options will be set forth in a prospectus supplement. Thesupplements carefully before you make your investment decision.
Our common stock is listed on the Nasdaq Global Market under the symbol “LUMO.” On July 24, 2020, the last reported sale price to the public of such securities and the net proceeds we expect to receive from such sale will also be set forth in a prospectus supplement.for our common stock was $15.19 per share.

Investing in our securities involves a high degree of risk. You should review carefullySee “Risk Factors” on page 2 of this prospectus and in the risks and uncertainties described under the heading “Risk Factors” containeddocuments incorporated by reference in this prospectus, as updated in the applicable prospectus supplement, and any related free writing prospectus,other future filings we make with the Securities and under similar headings in the other documentsExchange Commission that are incorporated by reference into this prospectus, as described on page 4for a discussion of the factors you should consider carefully before deciding to purchase our securities.


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

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF 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                     , 2018.2020




TABLE OF CONTENTS


  Page
ABOUT THIS PROSPECTUS
SUMMARY 
RISK FACTORS 
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS 
RATIO OF EARNINGS TO FIXED CHARGES
USE OF PROCEEDS 
DESCRIPTION OF CAPITAL STOCKSELLING STOCKHOLDERS 
DESCRIPTION OF DEBT SECURITIES
DESCRIPTION OF WARRANTS
LEGAL OWNERSHIP OF SECURITIES
PLAN OF DISTRIBUTION 
LEGAL MATTERS 
EXPERTS 
WHERE YOU CAN FIND MORE INFORMATION 
INCORPORATION OF CERTAIN INFORMATION BY REFERENCE 





ABOUT THIS PROSPECTUS
This prospectus is a part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission, or SEC, utilizing a “shelf” registration process. Under this shelf registration process, we may sell any combination of the securities described in this prospectus in one or more offerings up to a total aggregate offering price of $250,000,000. This prospectus provides you with a general description of the securities we may offer.

Each time we sell securities under this prospectus, we will provide a prospectus supplement that will contain specific information about the terms of that offering. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to these offerings. The prospectus supplement and any related free writing prospectus that we may authorize to be provided to you may also add, update or change information contained in this prospectus or in any documents that we have incorporated by reference into this prospectus. You should read this prospectus, any applicable prospectus supplement and any related free writing prospectus, together withrely only on the information incorporated herein by reference as described under the heading “Incorporation of Certain Information by Reference,” before investing in any of the securities offered.

THIS PROSPECTUS MAY NOT BE USED TO CONSUMMATE A SALE OF SECURITIES UNLESS IT IS ACCOMPANIED BY A PROSPECTUS SUPPLEMENT.

Neither we, nor any agent, underwriter or dealer has authorized any person to give any information or to make any representation other than those contained or incorporated by reference in this prospectus,prospectus. We have not authorized any applicable prospectus supplementother person to provide you with different information. If anyone provides you with different or any related free writing prospectus prepared by orinconsistent information, you should not rely on behalf of us or to which we have referred you.it. This prospectus may only be used where it is legal to offer and sell shares of our common stock. If it is against the law in any applicable supplementjurisdiction to this prospectus or any related free writing prospectus do not constitutemake an offer to sell these shares, or the solicitation ofto solicit an offer from someone to buy any securities other than the registered securities to which they relate, nor dothese shares, then this prospectus any applicable supplement to this prospectus or any related free writing prospectus constitute an offer to sell or the solicitation of an offer to buy securities in any jurisdictiondoes not apply to any person to whom it is unlawful to make suchin that jurisdiction, and no offer or solicitation inis made by this prospectus to any such jurisdiction.

person. You should not assume that the information containedappearing in this prospectus any applicable prospectus supplement or any related free writing prospectus is accurate on any date subsequent toonly as of the date set forth on the front cover of this prospectus, regardless of the document or that any information we have incorporated by reference is correct on any date subsequent to the datetime of the document incorporated by reference, even thoughdelivery of this prospectus or of any applicable prospectus supplement or any related free writing prospectussale of common stock. Our business, financial condition, results of operations and prospects may have changed since such date. Information contained on our website is delivered, or securities are sold, onnot a later date.part of this prospectus. 



PROSPECTUS SUMMARY

This prospectus and the information incorporated herein by reference contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under the heading “Where You Can Find More Information.”
NewLink Genetics® and HyperAcute® are registered trademarks of NewLink Genetics Corporation. This prospectus may also include other registered and unregistered trademarks of NewLink Genetics Corporation and other persons. Registered trademarks and tradenames may appear in this prospectus without an accompanying “®” designation.
Unless the context indicates otherwise, references in this prospectus to “NewLink,” “the Company,” “we,” “us,” “our” and similar references refer to NewLink Genetics Corporation and its wholly owned subsidiaries.



i



SUMMARY
The following summary highlights the information contained elsewhere in or incorporated by reference into this prospectus andprospectus. Because this is only a summary, it does not contain all of the information that you need toshould consider before investing in making your investment decision.our securities. You should carefully read thethis entire prospectus, the applicable prospectus supplement and any related free writing prospectus, including the risks of investing in our securities discussedinformation contained under the heading “Risk Factors” contained in the applicable prospectus supplementFactors,” and any related free writing prospectus, and under similar headings in theall other documents that are incorporated by reference into this prospectus. You should also carefully read the information included or incorporated by reference into this prospectus includingin their entirety before you invest in our securities.
Unless the context otherwise requires, all references in this prospectus to “Lumos,” “we,” “us,” “our,” “the Company” or similar words refer to Lumos Pharma, Inc., together with our consolidated financial statements, and the exhibits to the registration statement of which this prospectus is a part.subsidiaries.
Company Overview
We are a clinical-stage immuno-oncologybiopharmaceutical company focused on discoveringthe identification, acquisition and developingin-license, development, and commercialization of novel immunotherapeutic products for the treatment of patientsrare diseases. Our mission is to develop new therapies for people with cancer. rare diseases, prioritizing its focus where the medical need is high, and the pathophysiology is clear.
Our leading small-molecule product candidatescurrent pipeline is focused on the development of an orally administered small molecule, the growth hormone (“GH”) secretagogue ibutamoren (“LUM-201”) for rare endocrine disorders where injectable recombinant human growth hormone is currently in clinical development targetapproved. A secretagogue is a substance that stimulates the indoleamine-2, 3-dioxygenase,secretion or IDO, pathway, whichrelease of another substance. LUM-201 stimulates the release of GH and is one of the key pathways for cancer immune escape. These product candidates, indoximod and NLG802 (a prodrug of indoximod), are IDO pathway inhibitors with mechanisms of action that center around breaking the immune system’s tolerancereferred to cancer.
In cancer, the IDO pathway regulates immune response by suppressing T-cell activation, which enables cancer to avoid immune response. IDO is overexpressed in many cancers, both within tumor cells as a direct defense against T-cell attack,GH secretagogue. The current targeted indications for LUM-201 are Pediatric Growth Hormone Deficiency ("PGHD"), Turner Syndrome and also within antigen presenting cellsChildren Born Small for Gestational Age (“SGA”), in tumor-draining lymph nodes, thereby promoting peripheral toleranceeach case in a certain subset of affected patients. We are planning to tumor associated antigens, or TAAs. When hijacked by developing cancers in this manner, the IDO pathway may facilitate the survival, growth, invasion and metastasis of malignant cells whose expression of TAAs might otherwise be recognized and attacked by the immune system.    
The IDO pathway refers to a series of reactions initiated by IDO that result in the reduction of the amino acid tryptophan in the local tumor environment. We believe the local presence of tryptophan in adequate concentrations promotes antitumor T-cells, and the local reduction of tryptophan combined with the presence of the break-down product of tryptophan metabolism, kynurenine, is understood to suppress the activation of T-cells. Preclinical data continues to suggest that IDO pathway inhibitors may also enhance the anti-tumor effects of other immunotherapies, chemotherapies and radiation when used as a combination therapy for patients with cancer.

We haveinitiate a clinical development program focusedto study the effects of LUM-201 in PGHD prior to the end of 2020 with a Phase 2b clinical trial (the "Phase 2b Trial"). The coronavirus pandemic has caused pervasive interruptions to clinical trials industrywide. Facing similar near-term impediments, we have experienced some delays related to the pandemic and may experience further delays should the significant pandemic related disruptions persist. Depending on the IDO pathway. Our small-molecule IDO pathway inhibitor product candidates currentlyoutcome of data developed in the Phase 2b Trial and the timing of such data, we plan to conduct Phase 2 clinical development include indoximodtrials to study the effects of LUM-201 for Turner Syndrome and NLG802. Indoximod targets the IDO pathway through different mechanismsSGA in certain subsets of action from enzymatic IDO inhibitors and therefore could represent a different clinical and commercial opportunity. Indoximod acts as a tryptophan mimetic, thereby signaling the activation of antitumor T-cells by the up regulation of mTOR, acts directly on T-cells, and modulates AhR-mediated effects.affected patients.

We have observed an encouraging safety profile for our IDO pathway inhibitors. They are also orally bioavailable and we believe they offer the potential to be synergistic with other therapies such as radiation, chemotherapy, vaccination and immunotherapies involving other checkpoint inhibitors such as anti-PD-1, anti-PD-L1 or anti-CLTA4. Clinical data suggests an increase in activity without adding significant toxicity.

Corporate Information
We were incorporated in Delaware on June 4, 1999 and commenced operations on that date. Our principal executive office isoffices are located at 2503 South Loop Drive, Ames, Iowa 500104200 Marathon Blvd., Suite 200, Austin, Texas 78756 and our telephone number is (515) 296-5555. Our websiteat that address is www.newlinkgenetics.com.(512) 215-2630. Our corporate website is located at www.lumos-pharma.com. We make available free of charge through our website our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, or the Exchange Act, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. The information contained on,in, or that can be accessed through, our website is not part of this prospectus.
The Securities We May Offer
We may offer shares of our common stock and preferred stock, various series of debt securities and warrants to purchase any of such securities, up to a total aggregate offering price of $250,000,000 from time to time in one or more offerings under this prospectus, together with any applicable prospectus supplement and any related free writing prospectus, at prices and on terms to be determined by market conditions at the time of the relevant offering. This prospectus provides you with a general description of the securities we may offer. Each time we offer a type or series of securities under this prospectus, we will provide a prospectus supplement that will describe the specific amounts, prices and other important terms of the securities, including, to the extent applicable:
designation or classification;


aggregate principal amount or aggregate offering price;
maturity;
original issue discount;
rates and times of payment of interest or dividends;
redemption, conversion, exchange or sinking fund terms;
ranking;
restrictive covenants;
voting or other rights;
conversion or exchange prices or rates and any provisions for changes to or adjustments in the conversion or exchange prices or rates and in the securities or other property receivable upon conversion or exchange; and
important U.S. federal income tax considerations.

The prospectus supplement and any related free writing prospectus that we may authorize to be provided to you may also add, update or change information contained in this prospectus or in documents we have incorporated by reference. However, no prospectus supplement or free writing prospectus will offer a security that is not registered and described in this prospectus at the time of the effectiveness of the registration statement of which this prospectus is a part.THE OFFERING
We may sell the securities directly to investors or through underwriters, dealers or agents. We, and our underwriters or agents, reserve the right to accept or reject all or part of any proposed purchase of securities. If we do offer securities through underwriters or agents, we will include in the applicable prospectus supplement:

the names of those underwriters or agents;
applicable fees, discounts and commissions to be paid to them;
details regarding over-allotment options, if any; and
the estimated net proceeds to us.

This prospectus may not be used to consummate a sale of securities unless it is accompanied by a prospectus supplement.
Common Stock. We may issue shares of our common stock from time to time. Each holder of common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders and does not have cumulative voting rights. Subject to preferences that may apply to any outstanding preferred stock, holders of our common stock are entitled to receive ratably any dividends that our board of directors may declare out of funds legally available for that purpose. In the event of our liquidation, dissolution or winding up, holders of our common stock are entitled to share ratably in all assets remaining after payment of liabilities and the liquidation preference of any outstanding preferred stock. Holders of our common stock have no preemptive, conversion, subscription or other rights, and there are no redemption or sinking fund provisions applicable to our common stock. The rights, preferences and privileges of the holders of our common stock are subject to and may be adversely affected by the rights of the holders of shares of any series of our preferred stock that we may designate in the future. In this prospectus, we have summarized certain general features of our common stock under the heading “Description of Capital Stock-Common Stock.” We urge you, however, to read the applicable prospectus supplement (and any related free writing prospectus that we may authorize to be provided to you) related to any common stock being offered.
Preferred Stock. We may issue shares of our preferred stock from time to time, in one or more series. Under our certificate of incorporation, our board of directors has the authority, without further action by our stockholders (unless such stockholder action is required by applicable law or the rules of any stock exchange or market on which our securities are then traded), to issue up to 5,000,000 shares of preferred stock in one or more series and to fix the number, rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences and sinking fund terms, and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. Any convertible preferred stock we may issue will be convertible into our common stock or exchangeable for our other securities. Conversion may be mandatory or at the holder’s option and would be at prescribed conversion rates.
If we sell any series of preferred stock under this prospectus, we will fix the designations, voting powers, preferences and rights of such series of preferred stock, as well as the qualifications, limitations or restrictions thereof, in the certificate of designation relating to that series. We will file as an exhibit to the registration statement of which this prospectus is a part, or will incorporate by reference from reports that we file with the SEC, the form of any certificate of designation that describes the terms of the series of preferred stock that we are offering before the issuance of the related series of preferred stock. In this prospectus, we have summarized certain general features of the preferred stock under the heading “Description of Capital Stock-Preferred Stock.” We urge you, however, to read the applicable prospectus supplement (and any free writing prospectus that we may authorize to be
Common stock offered by selling stockholdersUp to 4,146,398 shares.
Use of proceedsWe will not receive any proceeds from the sale of shares of common stock by the selling stockholders.
Offering PriceThe selling stockholders may sell all or a portion of their shares through public or private transactions at prevailing market prices or at privately negotiated prices.
Risk factorsYou should read the “Risk Factors” section included in, and the risk factors incorporated by reference in this prospectus for a discussion of factors to consider carefully before deciding to invest in shares of our common stock.
Nasdaq Global Market symbol“LUMO”


provided to you) related to the series of preferred stock being offered, as well as the complete certificate of designation that contains the terms of the applicable series of preferred stock.
Debt Securities. From time to time, we may issue debt securities in one or more series, as either senior or subordinated debt or as senior or subordinated convertible debt. The senior debt securities will rank equally with any other unsecured and unsubordinated debt. The subordinated debt securities will be subordinate and junior in right of payment, to the extent and in the manner described in the instrument governing the debt, to all of our senior indebtedness. Convertible debt securities will be convertible into or exchangeable for our common stock or other securities. Conversion may be mandatory or at the holder’s option and would be at prescribed conversion rates.
Any debt securities issued under this prospectus will be issued under one or more documents called indentures, which are contracts between us and a national banking association or other eligible party, as trustee. In this prospectus, we have summarized certain general features of the debt securities under the heading “Description of Debt Securities.” We urge you, however, to read the applicable prospectus supplement (and any free writing prospectus that we may authorize to be provided to you) related to the series of debt securities being offered, as well as the complete indenture(s) and any supplemental indentures that contain the terms of the debt securities. We have filed a form of indenture as an exhibit to the registration statement of which this prospectus is a part. We will file as exhibits to the registration statement of which this prospectus is a part, or will be incorporated by reference from reports that we file with the SEC, supplemental indentures and forms of debt securities containing the terms of the debt securities being offered.
Warrants. We may issue warrants for the purchase of common stock, preferred stock or debt securities, in one or more series, from time to time. We may issue warrants independently or in combination with common stock, preferred stock or debt securities. In this prospectus, we have summarized certain general features of the warrants under the heading “Description of Warrants.” We urge you, however, to read the applicable prospectus supplement (and any free writing prospectus that we may authorize to be provided to you) related to the particular series of warrants being offered, as well as the complete warrant agreements and warrant certificates that contain the terms of the warrants. We have filed forms of the warrant agreements and forms of warrant certificates containing the terms of the warrants that we may offer as exhibits to the registration statement of which this prospectus is a part. We will file as exhibits to the registration statement of which this prospectus is a part, or will be incorporated by reference from reports that we file with the SEC, the form of warrant or the warrant agreement and warrant certificate, as applicable, that contain the terms of the particular series of warrants we are offering, and any supplemental agreements, before the issuance of such warrants.
Any warrants issued under this prospectus may be evidenced by warrant certificates. Warrants may be issued under a warrant agreement that we enter into with a warrant agent. We will indicate the name and address of the warrant agent, if applicable, in the prospectus supplement relating to the particular series of warrants being offered.



RISK FACTORS
Investing in our securities involves a high degree of risk. You should carefully reviewconsider the risks and uncertainties describedrisk factors set forth under the heading “Risk Factors” contained in the applicable prospectus supplement and any related free writing prospectus, and under similar headings in(i) our Annual Report on Form 10-K for the year ended December 31, 20172019, and in(ii) our most recent Quarterly Report on Form 10-Q for the three months ended March 31, 2020, each of which is incorporated by reference in this prospectus, together with all other information contained or incorporated by reference in this prospectus, as updated by our subsequent annual, quarterlyfilings under the Exchange Act, and the risk factors and other reports and documents filed with the SEC, which are incorporated by reference into thisinformation contained in any applicable prospectus supplement, before deciding whether to purchase any of the securities being registered pursuant to the registration statement of which this prospectus is a part. Each ofThe risks and uncertainties we describe in the risk factorsdocuments incorporated by reference herein are not the only ones we face.Additional risks and uncertainties not presently known to us could adversely affect our business, operating results of operations,and financial condition, and cash flows, as well as adversely affect the value of an investment in our securities, and the occurrence of any of these risks might cause you to lose all or part of your investment. Additional risks not presently known to us or that we currently believe are immaterial may also significantly impair our business operations.




SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus and the documentsour SEC filings that are incorporated by reference into this prospectus contain forward-looking statements. These are based on our management’s current beliefs, expectations and assumptions about future events, conditions and results and on information currently available to us. Discussions containing theseor incorporate by reference forward-looking statements may be found, among other places, in the sections titled “Business,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” incorporated by reference from our most recent Annual Report on Form 10-K, as well as any amendments thereto, and our most recent Quarterly Report on Form 10-Q, as applicable, filed with the SEC.
Any statements in this prospectus, or incorporated herein, about our expectations, beliefs, plans, objectives, assumptions or future events or performance are not historical facts and are forward-looking statements. Withinwithin the meaning of Section 27A of the Securities Act, and Section 21E of the Securities Exchange Act and the Private Securities Litigation Reform Act of 1934,1995, and such statements are subject to the “safe harbor” created by those sections. Forward-looking statements are based on our management’s beliefs and assumptions and on information available to our management as amended, orof the Exchange Act, thesedate hereof. In some cases, you can identify forward-looking statements by terms such as “may,” “will,” “should,” “could,” “would,” “expect,” “plans,” “anticipates,” “believes,” “estimates,” “projects,” “predicts,” “potential” and similar expressions intended to identify forward-looking statements. Examples of these statements include, but are not limited to, statements regarding:

the development plan for the Company’s product candidate LUM-201 (ibutamoren); the development plan for our ongoingexisting pipeline and potential partnership and out-licensing opportunities; the timing of planned preclinical studies and clinical trials;
the timing of the release of data from ongoing clinical studies;
the timing of and our ability to obtain and maintain regulatory approvals for our product candidates;
the clinical utility of our product candidates;
our plans to leverage our existing technologies to discover and develop additional product candidates;
our ability to quickly and efficiently identify and develop product candidates;
our intellectual property position;
the potential benefits of strategic collaboration agreements and our ability to enter into strategic collaborations, licensing or other arrangements;
our estimates regarding expenses, future revenues, capital requirements and needs for additional financing; and
our plans to develop commercialize, market and manufacturecommercialize our product candidates.

In some cases, you can identify forward-looking statements by terminology such as “anticipate,” “believe,” “could,” “estimate,” “expects,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “will,” “would” or the negative or plural of those terms, and similar expressions intended to identify statements about the future, although not all forward-looking statements contain these words. These statements involve known and unknown risks, uncertaintiescandidates; and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different fromrisks and uncertainties, including those described under the information expressed or implied by these forward-looking statements.
You should refer to theheading “Risk Factors” section contained in the applicable prospectus supplement and any related free writing prospectus, and under similar headings in the other documents that areor incorporated by reference intoin this prospectus for a discussion of important factors that may cause ourand in any applicable prospectus supplement. Our actual results tocould differ materially from those expressed or implied bydiscussed in our forward-looking statements. Given these risks, uncertaintiesstatements for many reasons, including those risks. These factors and the other factors, many of which are beyond our control, we cannot assure you that the forward-lookingcautionary statements made in this prospectus will proveshould be read as being applicable to be accurate, and you should not place undue reliance on these forward-looking statements. Furthermore, if ourall related forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertaintieswhenever they appear in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame, or at all.
this prospectus. Except as required by law, we assume no obligation to update these forward-looking statements publicly, or to revise anyupdate the reasons actual results could differ materially from those anticipated in these forward-looking statements, to reflect events or developments occurring after the date of this prospectus, even if new information becomes available in the future.



RATIO OF EARNINGS TO FIXED CHARGES
Our earnings were insufficient to cover fixed charges for certain of the periods in the table below and, accordingly, we have not included a ratio of earnings to fixed charges for these periods. The following table sets forth the dollar amount of the coverage deficiency for each of the periods presented. We do not have any preferred stock outstanding as of the date of this prospectus and did not have any preferred stock with required dividend payments during any of the periods presented below. Therefore, there are no preferred dividends included in our calculation of these ratios. This table is qualified Such factors may be amplified by the more detailedCOVID-19 pandemic and its potential impact on our business and the global economy. We disclaim any intention or obligation to update or revise any forward-looking statement, whether as a result of new information, appearing in the computation table set forth in Exhibit 12.1 to the registration statement of which this prospectus is a part.future events or otherwise.
(in thousand)Three Months Ended March 31, 2018Year Ended December 31,
2017 2016 2015 2014 2013
Ratio of earnings to fixed charges(1)N/AN/A N/A N/A 276x N/A
Deficiency of earnings available to cover fixed charges$(18,180)$(71,988) $(89,911) $(32,988) $— $(30,762)
(1)“Fixed charges” are calculated as the sum of (a) interest costs (both expensed and capitalized), (b) amortization of debt expense and discount or premium relating to any indebtedness and (c) that portion of rental expense that is representative of the interest factor.
"Earnings" are calculated as the amount from adding: (a) pre-tax income from continuing operations before adjustment for income or loss from equity investees, (b) fixed charges, (c) amortization of capitalized interest, (d) distributed income of equity investees, and (e) share of pre-tax losses of equity investees for which charges arising from guarantees are included in fixed charges; and subtracting (x) interest capitalized and (y) the noncontrolling interest in pre-tax income of subsidiaries that have not incurred fixed charges.



USE OF PROCEEDS
We will retain broad discretion over the use of the net proceeds from the sale of the securities offered hereby. Except as described in any applicable prospectus supplement or in any free writing prospectuses that we may authorize to be provided to you in connection with a specific offering, we currently intend to use the net proceeds from the sale of the securities offered hereby, if any, to fund research and development, acquire or invest in businesses, products or technologies that are complementary to our own, although we have no current plans, commitments or agreements with respect to any acquisitions as of the date of this prospectus, and for working capital and general corporate purposes. We will set forth in the applicable prospectus supplement or free-writing prospectus our intended use for the net proceeds received from the sale of any securities sold pursuant to the prospectus supplement or free-writing prospectus. Pending the use of net proceeds, we intend to invest the net proceeds in short-term, investment-grade, interest-bearing obligations, certificates of deposit or direct or guaranteed obligations of the United States.



DESCRIPTION OF CAPITAL STOCK
The following description of our capital stock and provisions of our amended and restated certificate of incorporation, as amended, or Amended Certificate, and amended and restated bylaws, or Bylaws are summaries. You should also refer to our Restated Certificate and our Bylaws, which are filed as exhibits to the registration statement of which this prospectus is part.

General
Under our Amended Certificate we are authorized to issue up to 75,000,000 shares of common stock, par value $0.01 per share, and 5,000,000 shares of preferred stock, par value $0.01 per share. Our board of directors may establish the rights and preferences of the preferred stock from time to time. As of March 31, 2018, we had outstanding 37,252,384 shares of common stock and no shares of preferred stock outstanding or designated.

Common Stock
Voting Rights
Each holder of common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders, including the election of directors, other than any amendment to the Amended Certificate that relates solely to the terms of one or more outstanding series of preferred stock, except as otherwise required by law. Our Amended Certificate and our Bylaws do not provide for cumulative voting rights. Because of this, the holders of a majority of the shares of common stock entitled to vote in any election of directors can elect all of the directors standing for election, if they should so choose.
Dividends
Subject to preferences that may apply to any outstanding preferred stock, holders of our common stock are entitled to receive ratably any dividends that our board of directors may declare out of funds legally available for that purpose on a non-cumulative basis.
Liquidation
In the event of our liquidation, dissolution or winding up, holders of our common stock are entitled to share ratably in all assets remaining after payment of liabilities and the liquidation preference of any outstanding preferred stock.
Rights and Preferences
Holders of our common stock have no preemptive, conversion, subscription or other rights, and there are no redemption or sinking fund provisions applicable to our common stock. The rights, preferences and privileges of the holders of our common stock are subject to and may be adversely affected by the rights of the holders of shares of any series of our preferred stock that we may designate in the future.

Preferred Stock
Pursuant to our Restated Certificate, our board of directors has the authority, without further action by our stockholders, to issue up to 5,000,000 shares of preferred stock in one or more series and to fix the number, rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences and sinking fund terms, and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. The issuance of our preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change of control or other corporate action, or make the removal of management more difficult. Additionally, the issuance of preferred stock may have the effect of decreasing the market price of the common stock.
Our board of directors will fix the designations, voting powers, preferences and rights of each series, as well as the qualifications, limitations or restrictions thereof, of the preferred stock of each series that we offer under this prospectus and applicable prospectus supplements in the certificate of designation relating to that series. We will file as an exhibit tofiling the registration statement of which this prospectus is a part to permit holders of the shares of our common stock described in the section entitled “Selling Stockholders” to resell such shares. We are not selling any securities under this prospectus and we will not receive any proceeds from the sale or other disposition of shares of our common stock held by the selling stockholders.
The selling stockholders will incorporatepay any discounts, commissions, fees of underwriters, selling brokers or dealer managers and expenses incurred by reference from reports that we file with the SEC,selling stockholders for brokerage, accounting, tax or legal services or any other expenses incurred by the formselling stockholders in disposing of any certificatethe shares. We will bear all other costs, fees and expenses incurred in effecting the registration of designation that describesthe shares covered by this prospectus, including, without limitation, all registration and filing fees, printing fees, Nasdaq listing fees and fees and expenses of our counsel and our accountants.
SELLING STOCKHOLDERS
This prospectus covers the resale by the selling stockholders identified below of up to 4,146,398 shares of our common stock issued or issuable to the selling stockholders pursuant to the Merger. Under the terms of the series of preferred stock we are offering before the issuance of that series of preferred stock. This description will include:
the title and stated value;Merger, Private Lumos


the numberstockholders received an aggregate of 4,146,398 shares we are offering;
the liquidation preference per share;
the purchase price per share;
the dividend rate per share, dividend period and payment dates and method of calculation for dividends;
whether dividends will be cumulative or non-cumulative and, if cumulative, the date from which dividends will accumulate;
our right, if any, to defer payment of dividends and the maximum length of any such deferral period;
the procedures for any auction and remarketing, if any;
the provisions for a sinking fund, if any;
the provisions for redemption or repurchase, if applicable, and any restrictions on our ability to exercise those redemption and repurchase rights;
any listing of the preferred stock on any securities exchange or market;
whether the preferred stock will be convertible into our common stock or other securitiesin a private placement transaction in reliance upon an exemption from the Securities Act of ours, including depositary shares and warrants, and, if applicable, the conversion period, the conversion price, or how it will be calculated, and under what circumstances it may be adjusted;
whether the preferred stock will be exchangeable into debt securities, and, if applicable, the1933, as amended, at an exchange period, the exchange price, or how it will be calculated, and under what circumstances it may be adjusted;
voting rights, if any,rate of the preferred stock;
preemption rights, if any;
restrictions on transfer, sale or other assignment, if any;
whether interests in the preferred stock will be represented by depositary shares;
a discussion of any material or special U.S. federal income tax considerations applicable to the preferred stock;
the relative ranking and preferences of the preferred stock as to dividend rights and rights if we liquidate, dissolve or wind up our affairs;
any limitations on issuances of any class or series of preferred stock ranking senior to or on a parity with the series of preferred stock being issued as to dividend rights and rights if we liquidate, dissolve or wind up our affairs; and
any other specific terms, rights, preferences, privileges, qualifications or restrictions of the preferred stock.

The Delaware General Corporation Law, or DGCL, which is the law of the state of our incorporation, provides that the holders of preferred stock will have the right to vote separately as a class (or, in some cases, as a series) on an amendment to our certificate of incorporation if the amendment would change the par value, the powers, preferences or special rights of the class or series so as to adversely affect the class or series, as the case may be, or, unless the certificate of incorporation provided otherwise, the number of authorized shares of the class. This right is in addition to any voting rights that may be provided for in the applicable certificate of designation.

Stock Options and Restricted Stock Units
As of March 31, 2018, there were 11,722,602(i) 0.1308319305 shares of common stock authorized under our equity incentive plan,in exchange for each share of which 8,369,519 shares were reserved for issuance upon exercise ofPrivate Lumos common stock outstanding options, 100,719 shares were reserved for issuance uponimmediately prior to the vesting of outstanding restricted stock units, and 1,495,690Merger, (ii) 0.0873621142 shares of our common stock remained availablein exchange for issuance. Aseach share of March 31, 2018, there were 101,996Private Lumos Series A Preferred Stock outstanding immediately prior to the Merger, and (iii) 0.1996348626 shares of our common stock reservedin exchange for issuance under our employee stock purchase plan, and no shares remained available for issuance under our non-employee directors’ stock award plan.

Anti-Takeover Provisions

Section 203each share of Private Lumos Series B Preferred Stock outstanding immediately prior to the Merger. Also, prior to the effective time of the Delaware General Corporation Law
We are subject to Section 203Merger, we effected a 1-for-9 reverse stock split of our common stock (the “Reverse Stock Split”). Immediately following the DGCL, which prohibits a Delaware corporation from engaging in any business combination with any interested stockholder for a period of three years afterReverse Stock Split and the date that such stockholder became an interested stockholder, with the following exceptions:

before such date, the board of directors of the corporation approved either the business combination or the transaction that resulted in the stockholder becoming an interested stockholder;
upon completion of the transaction that resulted in the stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction began, excluding for purposes of determining the voting stock outstanding, but not the outstanding voting stock owned by the interested stockholder, those shares owned (i) by persons who are directors and also officers and (ii) employee stock


plans in which employee participants do not have the right to determine confidentially whether shares held subject to the plan will be tendered in a tender or exchange offer; or
on or after such date, the business combination is approved by the board of directors and authorized at an annual or special meeting of the stockholders, and not by written consent, by the affirmative vote of at least 66 2/3% of the outstanding voting stock that is not owned by the interested stockholder.

In general, Section 203 defines a “business combination” to include the following:

any merger or consolidation involving the corporation and the interested stockholder;
any sale, transfer, pledge or other disposition of 10% or more of the assets of the corporation involving the interested stockholder;
subject to certain exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to the interested stockholder;
any transaction involving the corporation that has the effect of increasing the proportionate share of the stock or any class or series of the corporation beneficially owned by the interested stockholder; or
the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial benefits by or through the corporation.
In general, Section 203 defines an “interested stockholder” as an entity or person who, together with the entity or person’s affiliates and associates, beneficially owns, or is an affiliate or associate of the corporation and within three years prior to the time of determination of interested stockholder status did own, 15% or more of the outstanding voting stock of the corporation.
Amended and Restated Certificate of Incorporation and Amended and Restated Bylaws
Among other things, our Amended Certificate and our Bylaws provide for the following:
Our board of directors may issue up to 5,000,000Merger, there were 8,292,803 shares of preferred stock, with such rights, preferences and privileges as the board of directors may designate, including the right to approve an acquisition or other change in our control.
The personal liability for monetary damages of our directors to us and to our stockholders is limited to the fullest extent permitted by applicable law, including, without limitation, the Delaware General Corporation Law. This provision may reduce the likelihood of derivative litigation against directors and may discourage or deter stockholders or management from bringing a lawsuit against directors for breach of their fiduciary duty.
Special meetings of stockholders may only be called by our board of directors pursuant to a resolution adopted by a majority of the total number of authorized directors, the chairman of the board of directors, or the chief executive officer. In addition, our Bylaws establish procedures, including requirements for advance written notice and the form and content for stockholder notices, with regard to the nomination of candidates for election as directors and stockholder proposals. These provisions may delay or preclude stockholders from bringing matters before a meeting of stockholders or from making nominations for directors at a meeting of stockholders, which could delay or deter takeover attempts or changes in management.
The board of directors is divided into three classes of directors, with each class serving staggered three-year terms. As a result, approximately one-third of the board of directors will be elected each year. The classified board provision could have the effect of discouraging a third party from making a tender offer or attempting to obtain control of us. In addition, the classified board provision could delay stockholders who do not agree with the policies of the board of directors from removing a majority of the board of directors for two years.


Our Amended Certificate does not provide for cumulative voting for our directors. The absence of cumulative voting may make it more difficult for stockholders owning less than a majority of our stock to elect any directors to our board of directors. In addition, directors may be removed only for cause, and removal requires the affirmative vote of the holders of 66 2/3% of our voting stock.
Subject to the rights of the holders of any outstanding series of our preferred stock, all vacancies, including newly created directorships, may, except as otherwise required by law, be filled only by the affirmative vote of a majority of our directors then in office, even if less than a quorum, unless the board of directors determines by resolution that any such vacancies will be filled by the stockholders. In addition, the authorized number of directors may be changed only by resolution of our board of directors.
Stockholders are permitted to amend our Bylaws only upon receiving at least 66 2/3% of the votes entitled to be cast by holders of all outstanding shares then entitled to vote generally in the election of directors, voting together as a single class.
The combination of these provisions will make it more difficult for our existing stockholders to replace our board of directors as well as for another party to obtain control of us by replacing our board of directors. Because our board of directors has the power to retain and discharge our officers, these provisions could also make it more difficult for existing stockholders or another party to effect a change in management. In addition, the authorization of undesignated preferred stock makes it possible for our board of directors to issue preferred stock with voting or other rights or preferences that could impede the success of any attempt to change our control.
These provisions are intended to enhance the likelihood of continued stability in the composition of our board of directors and its policies and to discourage coercive takeover practices and inadequate takeover bids. These provisions are also designed to reduce our vulnerability to hostile takeovers and to discourage certain tactics that may be used in proxy fights. However, such provisions could have the effect of discouraging others from making tender offers for our shares and may have the effect of delaying changes in our control or management. As a consequence, these provisions may also inhibit fluctuations in the market price of our stock that could result from actual or rumored takeover attempts. We believe that the benefits of these provisions, including increased protection of our potential ability to negotiate with the proponent of an unfriendly or unsolicited proposal to acquire or restructure our company, outweigh the disadvantages of discouraging takeover proposals, because negotiation of takeover proposals could result in an improvement of their terms.

Transfer Agent and Registrar
The transfer agent and registrar for our common stock outstanding, and the former Private Lumos stockholders beneficially owned approximately 50% of the shares of the Company and the former NewLink stockholders beneficially owned approximately 50% of the shares of the Company. For accounting purposes, Private Lumos is Computershare Shareowners Services, LLC. The transfer agent for any series of preferred stock that we may offer under this prospectus will be named and describedconsidered to have acquired NewLink in the prospectus supplement for that series.
Listing onMerger. Under the Nasdaq Global Market
OurMerger Agreement, we agreed to file a registration statement to register the sale, resale or other distribution of the shares of our common stock is listed on Nasdaq underreceived by the symbol “NLNK.”



DESCRIPTION OF DEBT SECURITIES
We may issue debt securities from time to time, in one or more series, as either senior or subordinated debt or as senior or subordinated convertible debt. While the terms we have summarized below will apply generally to any debt securities that we may offer under this prospectus, we will describe the particular terms of any debt securities that we may offer in more detailPrivate Lumos stockholders in the applicable prospectus supplement.Merger within 90 days of the closing date of the Merger. The terms of any debt securities offered under a prospectus supplement may differ from the terms described below. Unless the context requires otherwise, whenever we refer to the indenture, we also are referring to any supplemental indentures that specify the terms of a particular series of debt securities.
We will issue the debt securities under the indenture that we will enter into with the trustee named in the indenture. The indenture will be qualified under the Trust Indenture Act of 1939, as amended, or the Trust Indenture Act. We have filed the form of indenture as an exhibit to the registration statement of which this prospectus is a part. part has been filed in accordance with the Merger Agreement.
We will filenot receive any proceeds from the resale of the common stock by the selling stockholders.
This prospectus covers the sale or other disposition by the selling stockholders of up to the total number of shares of our common stock issued or issuable to the selling stockholders pursuant to the Merger. The table below sets forth, to our knowledge, information concerning the beneficial ownership of shares of our common stock by the selling stockholders as exhibitsof May 27, 2020. The selling stockholders may sell all, some or none of the shares of common stock subject to this prospectus. See “Plan of Distribution” as may be supplemented and amended from time to time.
The number of shares of common stock beneficially owned prior to the offering for each selling stockholder includes (i) all shares of our common stock beneficially held by such selling stockholder as of May 27, 2020, (ii) the number of shares of our common stock that may be offered under this prospectus, and (iii) the number and percentage of our common stock beneficially owned by the selling stockholders assuming all of the shares of our common stock registered hereunder are sold. The table below and footnotes assume that the selling stockholders will sell all of the shares listed. However, because the selling stockholders may sell all or some of their shares under this prospectus from time to time, or in another permitted manner, we cannot assure you as to the actual number of shares that will be sold by the selling stockholders or that will be held by the selling stockholders after completion of any sales. We do not know how long the selling stockholders will hold the shares before selling them. The percentages of shares owned before and after the offering are based on 8,292,803 shares of common stock outstanding as of May 27, 2020, which includes the outstanding shares of common stock offered by this prospectus.
Beneficial ownership is determined in accordance with the rules of the SEC and includes voting or investment power with respect to our common stock. Generally, a person “beneficially owns” shares of our common stock if the person has or shares with others the right to vote those shares or to dispose of them, or if the person has the right to acquire voting or disposition rights within 60 days. The inclusion of any shares in this table does not constitute an admission of beneficial ownership for any selling stockholder named below.
Information about the selling stockholders may change over time. Any changed information will be set forth in an amendment to the registration statement or supplement to this prospectus, to the extent required by law. The selling stockholders listed below are sorted by beneficial ownership in decreasing order.


Name of Selling Stockholder Shares of Common Stock Beneficially Owned Prior to Offering Number of Shares of Common Stock Being Offered (1) Shares of Common Stock to be Beneficially Owned After Offering (2) 
  Number Percentage Offered Number Percentage 
Deerfield Private Design Fund III, L.P. (3) 936,291 11.3%936,291    
Richard J. Hawkins (4) 736,890 9.1%719,575 17,315 0.21%
Entities affiliated with New Enterprise Associates, Inc. (5) 526,663 6.4%526,663    
Clarus Lifesciences III, L.P. (6) 468,145 5.6%468,145    
Santé Health Ventures II, L.P. (7) 409,627 4.9%409,627    
Roche Finance Ltd (8) 292,590 3.5%292,590    
Jon Saxe 281,288 3.4%281,288    
UCB Finance N.V. (9) 175,554 2.1%175,554    
The Wellcome Trust Limited (10) 159,595 1.9%159,595    
Edward R. Gomoll 130,831 1.6%130,831    
Robert Davis 26,166 0.3%26,166    
Liza A. Squires 10,916 0.1%10,916    
Kevin Tully 9,144 0.1%9,144    
David Weiner 13 %13    
(1)The number of shares of our Common Stock in the column “Number of Shares Offered” represents all of the shares of our common stock that a selling stockholder may offer and sell from time to time under this prospectus.
(2)We do not know when or in what amounts a selling stockholder may offer shares for sale. The selling stockholders might not sell any or might sell all of the shares offered by this prospectus. Because the selling stockholders may offer all or some of the shares pursuant to this offering, and because there are currently no agreements, arrangements or understandings with respect to the sale of any of the shares, we cannot estimate the number of the shares that will be held by the selling stockholders after completion of the offering. However, for purposes of this table, we have assumed that, after completion of the offering, none of the shares covered by this prospectus will be held by the selling stockholders.
(3)Consists of shares held by Deerfield Private Design Fund III, L.P. Deerfield Mgmt III, L.P. is the general partner of, and Deerfield Management Company, L.P. is the investment advisor to, Deerfield Private Design Fund III, L.P. Mr. James E. Flynn is the sole member of the general partner of each of Deerfield Mgmt III, L.P. and Deerfield Management Company, L.P. The address for each of these entities and Mr. Flynn is 780 Third Avenue, 37th Floor, New York, NY 10017.
(4)Consists of (i) 719,575 shares of common stock held by Mr. Hawkins, and (ii) 17,315 shares Mr. Hawkins has the right to acquire through the exercise of stock options within 60 days of May 27, 2020.
(5)Consists of (i) 2,633 shares held by NEA Ventures 2013, L.P. (“Ven 2013”) and (ii) 524,030 shares held by New Enterprise Associates 14, L.P. (“NEA 14”) (collectively, the “NEA Shares”). The shares held by Ven 2013 are held indirectly by Karen P. Welsh, the general partner of Ven 2013. The shares held by NEA 14 are held indirectly by NEA Partners 14, L.P. (“NEA Partners 14”), the general partner of NEA 14, NEA 14 GP LTD (“NEA 14 LTD”), the general partner of NEA Partners 14, and the individual directors (the “Directors”) of NEA 14 LTD. The Directors of NEA 14 LTD are Forest Baskett, Anthony A. Florence, Patrick J. Kerins, Scott D. Sandell, and Peter W. Sonsini. All indirect holders of the above referenced shares disclaim beneficial ownership of all applicable shares except to the extent of their pecuniary interest therein. The address for each of these entities is c/o New Enterprise Associates, Inc., 1954 Greenspring Drive, Suite 600, Timonium, Maryland 21093.



(6)Consists of shares held by Clarus Lifesciences III, L.P. (“Clarus”). Clarus Ventures III GP, L.P. is the general partner of Clarus. Blackstone Clarus III L.L.C. is the general partner of Clarus Ventures III GP, L.P. The sole member of Blackstone Clarus III L.L.C. is Blackstone Holdings II L.P. The sole general partner of Blackstone Holdings II L.P. is Blackstone Holdings I/II GP L.L.C. The sole member of Blackstone Holdings I/II GP L.L.C. is The Blackstone Group Inc. The sole holder of the Class C common stock of The Blackstone Group Inc. is Blackstone Group Management L.L.C. Blackstone Group Management L.L.C. is wholly-owned by Blackstone’s senior managing directors and controlled by its founder, Stephen A. Schwarzman Each of such entities and Mr. Schwarzman may be deemed to beneficially own the shares beneficially owned by Clarus, but each (other than Clarus) disclaims beneficial ownership of such shares. The address for each of Clarus and Clarus Ventures III GP, L.P. is c/o Clarus Ventures LLC, 101 Main Street, Suite 1210, Cambridge, MA 02142. The address for each of the other Blackstone entities and Mr. Schwarzman is c/o The Blackstone Group Inc., 345 Park Avenue, New York, NY 10154.
(7)Consists of shares held by Santé Health Ventures II, L.P. Kevin Lalande, Joe Cunningham, M.D. and Douglas D. French, are managing directors (the “SHV Directors”) of SHV Management Services II, LLC (“SHV Management”). SHV Management is the general partner of SHV Management Services II, LP, which is the general partner of Santé Health Ventures II, L.P. Each of the SHV Directors, SHV Management, and SHV Management Services II, LP disclaims beneficial ownership of these securities except to the extent of its or his pecuniary interest therein. The address for these entities and individuals is 201 W 5th Street, Suite 1500, Austin, TX 78701.
(8)Consists of shares held by Roche Finance Ltd. Roche Finance Ltd is a wholly-owned subsidiary of Roche Holding Ltd, a publicly-held corporation. The principal address of Roche Finance Ltd is Grenzacherstrasse 122, 4070 Basel, Switzerland.
(9)Consists of shares held by UCB Finance N.V. UCB Finance N.V. is a direct wholly-owned subsidiary of UCB SA, a publicly-held company listed on Euronext Brussels. The principal address of UCB Finance N.V. is Hoge Mosten 2 A1, 4822 NH Breda.
(10)Consists of shares held by The Wellcome Trust Limited as trustee of the Wellcome Trust. The Wellcome Trust Limited as trustee of the Wellcome Trust, is governed by its Board of Governors, which is comprised of Eliza Manningham Buller, Michael Ferguson, Tobias Bonhoeffer, Elhadj As Sy, Amelia Fawcett, Richard Gillingwater, Bryan Grenfell, Fiona Powrie and Cilla Snowball. The principal address of The Wellcome Trust Limited as trustee of the Wellcome Trust is 215 Euston Road, London NW1 2BE, England.



Plan of Distribution
The selling stockholders, which as used herein includes donees, pledgees, transferees or other successors-in-interest selling shares of common stock or interests in shares of common stock received after the date of this prospectus from a selling stockholder as a gift, pledge, partnership distribution or other transfer, may, from time to time, sell, transfer or otherwise dispose of any or all of their shares of common stock or interests in shares of common stock on any stock exchange, market or trading facility on which the shares are traded or in private transactions. These dispositions may be at fixed prices, at prevailing market prices at the time of sale, at prices related to the prevailing market price, at varying prices determined at the time of sale, or at negotiated prices.
The selling stockholders may use any one or more of the following methods when disposing of shares or interests therein:
ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers;
block trades in which the broker-dealer will attempt to sell the shares as agent, but may position and resell a portion of the block as principal to facilitate the transaction;
purchases by a broker-dealer as principal and resale by the broker-dealer for its account;
an exchange distribution in accordance with the rules of the applicable exchange;
privately negotiated transactions;
short sales effected after the date the registration statement of which this prospectus is a part is declared effective by the SEC;
through the writing or will be incorporated by reference from reports that we filesettlement of options or other hedging transactions, whether through an options exchange or otherwise;
broker-dealers may agree with the SEC, supplemental indenturesselling stockholders to sell a specified number of such shares at a stipulated price per share;
a combination of any such methods of sale; and forms of debt securities containing the terms of the debt securities being offered.
any other method permitted by applicable law.

The following summary of material provisions of the debt securities and the indenture is subjectselling stockholders may, from time to and qualifiedtime, pledge or grant a security interest in its entirety by reference to,some or all of the provisionsshares of common stock owned by them and, if they default in the indenture applicable to a particular seriesperformance of debt securities. We urge you to readtheir secured obligations, the applicable prospectus supplements and any related free writing prospectuses related to the debt securities that wepledgees or secured parties may offer and sell the shares of common stock, from time to time, under this prospectus, as well as the complete indenture that contains the termsor under an amendment to this prospectus under Rule 424(b)(3) or other applicable provision of the debt securities.

General
The indenture does not limitSecurities Act of 1933, as amended (the “Securities Act”), amending the amountlist of debt securities that we may issue. It provides that we may issue debt securities upselling stockholders to include the principal amount that we may authorize and may be in any currency or currency unit that we may designate. 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 covenantspledgee, transferee or other provisions designed to give holderssuccessors in interest as selling stockholders under this prospectus. The selling stockholders also may transfer the shares of any debt securities protection against changescommon stock in our operations, financial conditionother circumstances, in which case the transferees, pledgees 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 be issued with “original issue discount,” or OID, for U.S. federal income tax purposes because of interest payment and other characteristics or terms of the debt securities. Material U.S. federal income tax considerations applicable to debt securities issued with OID will be describedsuccessors in more detail in any applicable prospectus supplement.
We will describe in the applicable prospectus supplement the terms of the series of debt securities being offered, including:
the title of the series of debt securities;
any limit upon the aggregate principal amount that may be issued;
the maturity date or dates;
the form of the debt securities of the series;
the applicability of any guarantees;
whether or not the debt securities will be secured or unsecured, and the terms of any secured debt;
whether the debt securities rank as senior debt, senior subordinated debt, subordinated debt or any combination thereof, and the terms of any subordination;
if the price (expressed as a percentage of the aggregate principal amount thereof) at which such debt securities will be issued is a price other than the principal amount thereof, the portion of the principal amount thereof payable upon declaration of acceleration of the maturity thereof, or if applicable, the portion of the principal amount of such debt securities that is convertible into another security or the method by which any such portion shall be determined;
the interest rate or rates, which may be fixed or variable, or the method for determining the rate and the date interest will begin to accrue, the dates interest will be payable and the regular record datesselling beneficial owners for interest payment dates or the method for determining such dates;purposes of this prospectus.
our right, if any, to defer payment of interest and the maximum length of any such deferral period;
if applicable, the date or dates after which, or the period or periods during which, and the price or prices at which, we may, at our option, redeem the series of debt securities pursuant to any optional or provisional redemption provisions and the terms of those redemption provisions;
the date or dates, if any, on which, and the price or prices at which we are obligated, pursuant to any mandatory sinking fund or analogous fund provisions or otherwise, to redeem, or at the holder’s option to purchase, the series of debt securities and the currency or currency unit in which the debt securities are payable;


the denominations in which we will issue the series of debt securities, if other than denominations of $1,000 and any integral multiple thereof;
any and all terms, if applicable, relating to any auction or remarketing of the debt securities of that series and any security for our obligations with respect to such debt securities and any other terms which may be advisable inIn connection with the marketingsale of debt securities of that series;
whetherour common stock or interests therein, the debt securitiesselling stockholders may enter into hedging transactions with broker-dealers or other financial institutions, which may in turn engage in short sales of the series shallcommon stock in the course of hedging the positions they assume. The selling stockholders may also sell shares of our common stock short and deliver these securities to close out their short positions, or loan or pledge the common stock to broker-dealers that in turn may sell these securities. The selling stockholders may also enter into option or other transactions with broker-dealers or other financial institutions or the creation of one or more derivative securities which require the delivery to such broker-dealer or other financial institution of shares offered by this prospectus, which shares such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction).
The aggregate proceeds to the selling stockholders from the sale of the common stock offered by them will be issuedthe purchase price of the common stock less discounts or commissions, if any. Each of the selling stockholders reserves the right to accept and, together with their agents from time to time, to reject, in whole or in part, in the formany proposed purchase of a global securitycommon stock to be made


directly or securities; the terms and conditions, ifthrough agents. We will not receive any upon which such global security or securities may be exchanged in whole or in part for other individual securities; and the depositary for such global security or securities;
if applicable, the provisions relating to conversion or exchange of any debt securities of the series andproceeds from this offering. Upon any exercise of the terms and conditions upon which such debt securitieswarrants by payment of cash, however, we will be so convertiblereceive the exercise price of the warrants.
The selling stockholders also may resell all or exchangeable, including the conversion or exchange price, as applicable, or how it will be calculated and may be adjusted, any mandatory or optional (at our option or the holders’ option) conversion or exchange features, the applicable conversion or exchange period and the manner of settlement for any conversion or exchange;
if other than the full principal amount thereof, thea portion of the principal amountshares in open market transactions in reliance upon Rule 144 under the Securities Act, provided that they meet the criteria and conform to the requirements of debt securities of the series which shall be payable upon declaration of acceleration of the maturity thereof;that rule.
additions toThe selling stockholders and any underwriters, broker-dealers or changesagents that participate in the covenants applicable to the particular debt securities being issued, including, among others, the consolidation, merger or sale covenant;
additions to or changes in the events of default with respect to the securities and any change in the right of the trustee or the holders to declare the principal, premium, if any, and interest, if any, with respect to such securities to be due and payable;
additions to or changes in or deletions of the provisions relating to covenant defeasance and legal defeasance;
additions to or changes in the provisions relating to satisfaction and discharge of the indenture;
additions to or changes in the provisions relating to the modification of the indenture both with and without the consent of holders of debt securities issued under the indenture;
the currency of payment of debt securities if other than U.S. dollars and the manner of determining the equivalent amount in U.S. dollars;
whether interest will be payable in cash or additional debt securities at our or the holders’ option and the terms and conditions upon which the election may be made;
the terms and conditions, if any, upon which we will pay amounts in addition to the stated interest, premium, if any and principal amounts of the debt securities of the series to any holder that is not a “United States person” for federal tax purposes;
any restrictions on transfer, sale or assignment of the debt securities of the series; and
any other specific terms, preferences, rights or limitations of, or restrictions on, the debt securities, any other additions or changes in the provisions of the indenture, and any terms that may be required by us or advisable under applicable laws or regulations.

Conversion or Exchange Rights
We will set forth in the applicable prospectus supplement the terms on which a series of debt securities may be convertible into or exchangeable for our common stock or our other securities. We will include provisions as to settlement upon conversion or exchange and whether conversion or exchange is mandatory, atinterests therein may be “underwriters” within the optionmeaning of Section 2(11) of the holderSecurities Act. Any discounts, commissions, concessions or at our option. Weprofit they earn on any resale of the shares may include provisions pursuantbe underwriting discounts and commissions under the Securities Act. Selling stockholders who are “underwriters” within the meaning of Section 2(11) of the Securities Act will be subject to which the numberprospectus delivery requirements of the Securities Act.
To the extent required, the shares of our common stock or our other securities thatto be sold, the holdersnames of the seriesselling stockholders, the respective purchase prices and public offering prices, the names of debt securities receive would be subject to adjustment.

Consolidation, Mergerany agents, dealer or Sale
Unless we provide otherwise in the prospectus supplementunderwriter, and any applicable commissions or discounts with respect to a particular series of debt securities, the indenture will not contain any covenant that restricts our ability to merge or consolidate, or sell, convey, transfer or otherwise dispose of our assets as an entirety or substantially as an entirety. However, any successor to or acquirer of such assets (other than a subsidiary of ours) must assume all of our obligations under the indenture or the debt securities, as appropriate.

Events of Default under the Indenture
Unless we provide otherwise in the prospectus supplement applicable to a particular series of debt securities, the following are events of default under the indenture with respect to any series of debt securities that we may issue:
if we fail to pay any installment of interest on any series of debt securities, as and when the same shall become due and payable, and such default continues for a period of 90 days; provided, however, that a valid extension of an interest payment period by us in accordance with the terms of any indenture supplemental thereto shall not constitute a default in the payment of interest for this purpose;
if we fail to pay the principal of, or premium, if any, on any series of debt securities as and when the same shall become due and payable whether at maturity, upon redemption, by declaration or otherwise, or in any payment required by any sinking or analogous fund established with respect to such series; provided, however, that a valid extension of the maturity of such debt securities in accordance with the terms of any indenture supplemental thereto shall not constitute a default in the payment of principal or premium, if any;
if we fail to observe or perform any other covenant or agreement contained in the debt securities or the indenture, other than a covenant specifically relating to another series of debt securities, and our failure continues for 90 days after we receive written notice of such failure, requiring the same to be remedied and stating that such is a notice of default thereunder, from the trustee or holders of at least 25% in aggregate principal amount of the outstanding debt securities of the applicable series; and
if specified events of bankruptcy, insolvency or reorganization occur.
If an event of default with respect to debt securities of any series occurs and is continuing, other than an event of default specified in the last bullet point above, the trustee or the holders of at least 25% in aggregate principal amount of the outstanding debt securities of that series, by notice to us in writing, and to the trustee if notice is given by such holders, may declare the unpaid principal of, premium, if any, and accrued interest, if any, due and payable immediately. If an event of default specified in the last
bullet point above occurs with respect to us, the principal amount of and accrued interest, if any, of each issue of debt securities then outstanding shall be due and payable without any notice or other action on the part of the trustee or any holder.
The holders of a majority in principal amount of the outstanding debt securities of an affected series may waive any default or event of default with respect to the series and its consequences, except defaults or events of default regarding payment of principal, premium, if any, or interest, unless we have cured the default or event of default in accordance with the indenture. Any waiver shall cure the default or event of default.
Subject to the terms of the indenture, if an event of default under an indenture shall occur and be continuing, the trustee will be under no obligation to exercise any of its rights or powers under such indenture at the request or direction of any of the holders of the applicable series of debt securities, unless such holders have offered the trustee reasonable indemnity. The holders of a majority in principal amount of the outstanding debt securities of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee, or exercising any trust or power conferred on the trustee, with respect to the debt securities of that series, provided that:
the direction so given by the holder is not in conflict with any law or the applicable indenture; and
subject to its duties under the Trust Indenture Act, the trustee need not take any action that might involve it in personal liability or might be unduly prejudicial to the holders not involved in the proceeding.
A holder of the debt securities of any series will have the right to institute a proceeding under the indenture or to appoint a receiver or trustee, or to seek other remedies only if:
the holder has given written notice to the trustee of a continuing event of default with respect to that series;
the holders of at least 25% in aggregate principal amount of the outstanding debt securities of that series have made written request,
such holders have offered to the trustee indemnity satisfactory to it against the costs, expenses and liabilities to be incurred by the trustee in compliance with the request; and
the trustee does not institute the proceeding, and does not receive from the holders of a majority in aggregate principal amount of the outstanding debt securities of that series other conflicting directions within 90 days after the notice, request and offer.
These limitations do not apply to a suit instituted by a holder of debt securities if we default in the payment of the principal, premium, if any, or interest on, the debt securities.
We will periodically file statements with the trustee regarding our compliance with specified covenants in the indenture.

Modification of Indenture; Waiver
We and the trustee may change an indenture without the consent of any holders with respect to specific matters:
to cure any ambiguity, defect or inconsistency in the indenture or in the debt securities of any series;
to comply with the provisions described above under “Description of Debt Securities-Consolidation, Merger or Sale;”
to provide for uncertificated debt securities in addition to or in place of certificated debt securities;
to add to our covenants, restrictions, conditions or provisions such new covenants, restrictions, conditions or provisions for the benefit of the holders of all or any series of debt securities, to make the occurrence, or the occurrence and the continuance, of a default in any such additional covenants, restrictions, conditions or provisions an event of default or to surrender any right or power conferred upon us in the indenture;
to add to, delete from or revise the conditions, limitations, and restrictions on the authorized amount, terms, or purposes of issue, authentication and delivery of debt securities, as set forth in the indenture;
to make any change that does not adversely affect the interests of any holder of debt securities of any series in any material respect;
to provide for the issuance of and establish the form and terms and conditions of the debt securities of any series as provided above under “Description of Debt Securities-General” to establish the form of any certifications required to be furnished pursuant to the terms of the indenture or any series of debt securities, or to add to the rights of the holders of any series of debt securities;
to evidence and provide for the acceptance of appointment under any indenture by a successor trustee; or
to comply with any requirements of the SEC in connection with the qualification of any indenture under the Trust Indenture Act.
In addition, under the indenture, the rights of holders of a series of debt securities may be changed by us and the trustee with the written consent of the holders of at least a majority in aggregate principal amount of the outstanding debt securities of each series that is affected. However, unless we provide otherwise in the prospectus supplement applicable to a particular series of debt


securities, we and the trustee may make the following changes only with the consent of each holder of any outstanding debt securities affected:
extending the fixed maturity of any debt securities of any series;
reducing the principal amount, reducing the rate of or extending the time of payment of interest, or reducing any premium payable upon the redemption of any series of any debt securities; or
reducing the percentage of debt securities, the holders of which are required to consent to any amendment, supplement, modification or waiver.

Discharge
Each indenture provides that we can elect to be discharged from our obligations with respect to one or more series of debt securities, except for specified obligations, including obligations to:
provide for payment;
register the transfer or exchange of debt securities of the series;
replace stolen, lost or mutilated debt securities of the series;
pay principal of and premium and interest on any debt securities of the series;
maintain paying agencies;
hold monies for payment in trust;
recover excess money held by the trustee;
compensate and indemnify the trustee; and
appoint any successor trustee.
In order to exercise our rights to be discharged, we must deposit with the trustee money or government obligations sufficient to pay all the principal of, any premium, if any, and interest on, the debt securities of the series on the dates payments are due.

Form, Exchange and Transfer
We will issue the debt securities of each series only in fully registered form without coupons and, unless we provide otherwise in the applicable prospectus supplement, in denominations of $1,000 and any integral multiple thereof. The indenture provides that we may issue debt securities of a series in temporary or permanent global form and as book-entry securities that will be deposited with, or on behalf of, The Depository Trust Company, or DTC, or another depositary named by us and identified in the applicable prospectus supplement with respect to that series. To the extent the debt securities of a series are issued in global form and as book-entry, a description of terms relating to any book-entry securitiesoffer will be set forth in an accompanying prospectus supplement or, if appropriate, a post-effective amendment to the registration statement that includes this prospectus.
In order to comply with the securities laws of some states, if applicable, prospectus supplement.the common stock may be sold in these jurisdictions only through registered or licensed brokers or dealers. In addition, in some states the common stock may not be sold unless it has been registered or qualified for sale or an exemption from registration or qualification requirements is available and is complied with.
AtWe have advised the optionselling stockholders that the anti-manipulation rules of Regulation M under the Exchange Act may apply to sales of shares in the market and to the activities of the holder, subject to the terms of the indentureselling stockholders and the limitations applicable to global securities described in the applicable prospectus supplement, the holder of the debt securities of any series can exchange the debt securities for other debt securities of the same series, in any authorized denomination and of like tenor and aggregate principal amount.
Subject to the terms of the indenture and the limitations applicable to global securities set forth in the applicable prospectus supplement, holders of the debt securities may present the debt securities for exchange or for registration of transfer, duly endorsed or with the form of transfer endorsed thereon duly executed if so required by us or the security registrar, at the office of the security registrar or at the office of any transfer agent designated by us for this purpose. Unless otherwise provided in the debt securities that the holder presents for transfer or exchange, we will impose no service charge for any registration of transfer or exchange, but we may require payment of any taxes or other governmental charges.
We will name in the applicable prospectus supplement the security registrar, and any transfer agent intheir affiliates. In addition, to the security registrar, that we initially designate for any debt securities. We may at any time designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which any transfer agent acts, except that we will be required to maintain a transfer agent in each place of payment for the debt securities of each series.
If we elect to redeem the debt securities of any series, we will not be required to:
issue, register the transfer of, or exchange any debt securities of that series during a period beginning at the opening of business 15 days before the day of mailing of a notice of redemption of any debt securities that may be selected for redemption and ending at the close of business on the day of the mailing; or
register the transfer of or exchange any debt securities so selected for redemption, in whole or in part, except the unredeemed portion of any debt securities we are redeeming in part.



Information Concerning the Trustee
The trustee, other than during the occurrence and continuance of an event of default under an indenture, undertakes to perform only those duties as are specifically set forth in theextent applicable, indenture. Upon an event of default under an indenture, the trustee must use the same degree of care as a prudent person would exercise or use in the conduct of his or her own affairs. Subject to this provision, the trustee is under no obligation to exercise any of the powers given it by the indenture at the request of any holder of debt securities unless it is offered reasonable security and indemnity against the costs, expenses and liabilities that it might incur.

Payment and Paying Agents
Unless we otherwise indicate in the applicable prospectus supplement, we will make paymentcopies of this prospectus (as it may be supplemented or amended from time to time) available to the selling stockholders for the purpose of satisfying the prospectus delivery requirements of the interest onSecurities Act. The selling stockholders may indemnify any debt securities on any interest payment date tobroker-dealer that participates in transactions involving the person in whose name the debt securities, or one or more predecessor securities, are registered at the close of business on the regular record date for the interest.
We will pay principal of and any premium and interest on the debt securities of a particular series at the officesale of the paying agents designated by us, except that unless we otherwise indicate inshares against certain liabilities, including liabilities arising under the applicable prospectus supplement, we will make interest payments by check that we will mail to the holder or by wire transfer to certain holders. Unless we otherwise indicate in the applicable prospectus supplement, we will designate the corporate trust office of the trustee as our sole paying agent for payments with respect to debt securities of each series. We will name in the applicable prospectus supplement any other paying agents that we initially designate for the debt securities of a particular series. We will maintain a paying agent in each place of payment for the debt securities of a particular series.
All money we pay to a paying agent or the trustee for the payment of the principal of or any premium or interest on any debt securities that remains unclaimed at the end of two years after such principal, premium or interest has become due and payable will be repaid to us, and the holder of the debt security thereafter may look only to us for payment thereof.

Governing Law
The indenture and the debt securities will be governed by and construed in accordance with the internal laws of the State of New York, except to the extent that the Trust Indenture Act of 1939 is applicable.



DESCRIPTION OF WARRANTS
The following description, together with the additional information we may include in any applicable prospectus supplement and in any related free writing prospectus that we may authorize to be distributed to you, summarizes the material terms and provisions of the warrants that we may offer under this prospectus, which may consist of warrants to purchase common stock, preferred stock or debt securities and may be issued in one or more series. Warrants may be offered independently or in combination with common stock, preferred stock or debt securities offered by any prospectus supplement. While the terms we have summarized below will apply generally to any warrants that we may offer under this prospectus, we will describe the particular terms of any series of warrants in more detail in the applicable prospectus supplement. The following description of warrants will apply to the warrants offered by this prospectus unless we provide otherwise in the applicable prospectus supplement. The applicable prospectus supplement for a particular series of warrants may specify different or additional terms.Securities Act.
We have filed forms ofagreed with the warrant agreements and forms of warrant certificates listing the terms of the warrants that may be offered as exhibitsselling stockholders to use commercially reasonable efforts to cause the registration statement of which this prospectus constitutes a part effective and to remain continuously effective and usable until the date that is a part. We will filethe three-year anniversary of the effective date of such registration, or such earlier time as exhibits toall shares covered by the registration statement of which this prospectus isconstitutes a part (i) have been sold pursuant to such registration statement or will incorporate by reference from reports that we file with the SEC, the form of warrant or the warrant agreement and warrant certificate, as applicable, that contain the terms of the particular series of warrants we are offering, as well as any supplemental agreements, before the issuance of such warrants. The following summaries of material terms and provisions of the warrants are subject to, and qualified in their entirety by reference to, all the provisions of the form of warrant or the warrant agreement and warrant certificate, as applicable, and any supplemental agreements applicable to a particular series of warrants that we may offer under this prospectus. We urge you to read the applicable prospectus supplement related to the particular series of warrants that we may offer under this prospectus, as well as any related free writing prospectus, and the complete form of warrant or the warrant agreement and warrant certificate, as applicable, and any supplemental agreements, that list the terms of the warrants.

General
In the applicable prospectus supplement, we will describe the terms of the series of warrants being offered, including, to the extent applicable:

the offering price and aggregate number of warrants offered;
the currency for which the warrantsotherwise, (ii) may be purchased;
transferred under Rule 144 or another similar exemption under the designation and termsSecurities Act without manner of the securities with which the warrants are issued and the number of warrants issued with each such security or each principal amount of such security;
in the case of warrants to purchase debt securities, the principal amount of debt securities purchasable on exercise of one warrant and the price at, and currency in which, this principal amount of debt securities may be purchased on such exercise;
in the case of warrants to purchase common stock or preferred stock, the number of shares of common stock or preferred stock, as the case may be, purchasable on the exercise of one warrant and the price at which these shares may be purchased on such exercise;
the effect of any merger, consolidation, sale or other disposition of our business on the warrant agreements and the warrants;
the terms of any rightsvolume restrictions, or (iii) cease to redeem or call the warrants;
any provisions for changes to or adjustments in the exercise price or number of securities issuable on exercise of the warrants;
the dates on which the right to exercise the warrants will commence and expire;
the manner in which the warrant agreements and warrants may be modified;
a discussion of material or special U.S. federal income tax considerations of holding or exercising the warrants;
the terms of the securities issuable on exercise of the warrants; and
any other specific terms, preferences, rights or limitations of or restrictions on the warrants.

Before exercising their warrants, holders of warrants will not have any of the rights of holders of the securities purchasable on such exercise, including:

in the case of warrants to purchase common stock or preferred stock, the right to receive dividends, if any, or payments on our liquidation, dissolution or winding up or to exercise voting rights, if any; or
in the case of warrants to purchase debt securities, the right to receive payments of principal of, or premium, if any, or interest on, the debt securities purchasable on exercise or to enforce covenants in the applicable indenture.

Exercise of Warrants
Each warrant will entitle the holder to purchase the securities that we specify in the applicable prospectus supplement at the exercise price that we describe in the applicable prospectus supplement. The warrants may be exercised as listed in the prospectus supplement relating to the warrants offered. Unless we otherwise specify in the applicable prospectus supplement, warrants may be exercised at any time up to the specified time on the expiration date that we list in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void.
On receipt of payment and the warrant or warrant certificate, as applicable, properly completed and duly executed at the corporate trust office of the warrant agent, if any, or any other office, including ours, indicated in the prospectus supplement, we will, as soon as practicable, issue and deliver the securities purchasable on such exercise. If less than all of the warrants (or the warrants represented by such warrant certificate) are exercised, a new warrant or a new warrant certificate, as applicable, will be issued for the remaining warrants.
Governing Law
Unless we provide otherwise in the applicable prospectus supplement, the warrants and warrant agreements will be governed by and construed in accordance with the laws of the State of New York.

Enforceability of Rights by Holders of Warrants
Each warrant agent, if any, will act solely as our agent under the applicable warrant agreement and will not assume any obligation or relationship of agency or trust with any holder of any warrant. A single bank or trust company may act as warrant agent for more than one issue of warrants. A warrant agent will have no duty or responsibility in case of any default by us under the applicable warrant agreement or warrant, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand on us. Any holder of a warrant may, without the consent of the related warrant agent or the holder of any


other warrant, enforce by appropriate legal action its right to exercise, and receive the securities purchasable on exercise of, its warrants.outstanding.



LEGAL OWNERSHIP OF SECURITIES
We can issue securities in registered form or in the form of one or more global securities. We describe global securities in greater detail below. We refer to those persons who have securities registered in their own names on the books that we or any applicable trustee or depositary maintain for this purpose as the “holders” of those securities. These persons are the legal holders of the securities. We refer to those persons who, indirectly through others, own beneficial interests in securities that are not registered in their own names, as “indirect holders” of those securities. As we discuss below, indirect holders are not legal holders, and investors in securities issued in book-entry form or in street name will be indirect holders.

Book-Entry Holders
We may issue securities in book-entry form only, as we will specify in the applicable prospectus supplement. This means securities may be represented by one or more global securities registered in the name of a financial institution that holds them as depositary on behalf of other financial institutions that participate in the depositary’s book-entry system. These participating institutions, which are referred to as participants, in turn, hold beneficial interests in the securities on behalf of themselves or their customers.
Only the person in whose name a security is registered is recognized as the holder of that security. Global securities will be registered in the name of the depositary or its participants. Consequently, for global securities, we will recognize only the depositary as the holder of the securities, and we will make all payments on the securities to the depositary. The depositary passes along the payments it receives to its participants, which in turn pass the payments along to their customers who are the beneficial owners. The depositary and its participants do so under agreements they have made with one another or with their customers; they are not obligated to do so under the terms of the securities.
As a result, investors in a global security will not own securities directly. Instead, they will own beneficial interests in a global security, through a bank, broker or other financial institution that participates in the depositary’s book-entry system or holds an interest through a participant. As long as the securities are issued in global form, investors will be indirect holders, and not legal holders, of the securities.

Street Name Holders
We may terminate a global security or issue securities that are not issued in global form. In these cases, investors may choose to hold their securities in their own names or in “street name.” Securities held by an investor in street name would be registered in the name of a bank, broker or other financial institution that the investor chooses, and the investor would hold only a beneficial interest in those securities through an account he or she maintains at that institution.
For securities held in street name, we or any applicable trustee or depositary will recognize only the intermediary banks, brokers and other financial institutions in whose names the securities are registered as the holders of those securities, and we or any such trustee or depositary will make all payments on those securities to them. These institutions pass along the payments they receive to their customers who are the beneficial owners, but only because they agree to do so in their customer agreements or because they are legally required to do so. Investors who hold securities in street name will be indirect holders, not holders, of those securities.

Legal Holders
Our obligations, as well as the obligations of any applicable trustee or third party employed by us or a trustee, run only to the legal holders of the securities. We do not have obligations to investors who hold beneficial interests in global securities, in street name or by any other indirect means. This will be the case whether an investor chooses to be an indirect holder of a security or has no choice because we are issuing the securities only in global form.
For example, once we make a payment or give a notice to the holder, we have no further responsibility for the payment or notice even if that holder is required, under agreements with its participants or customers or by law, to pass it along to the indirect holders but does not do so. Similarly, we may want to obtain the approval of the holders to amend an indenture, to relieve us of the consequences of a default or of our obligation to comply with a particular provision of an indenture, or for other purposes. In such an event, we would seek approval only from the holders, and not the indirect holders, of the securities. Whether and how the legal holders contact the indirect holders is up to the legal holders.



Special Considerations for Indirect Holders
If you hold securities through a bank, broker or other financial institution, either in book-entry form because the securities are represented by one or more global securities or in street name, you should check with your own institution to find out:
how it handles securities payments and notices;
whether it imposes fees or charges;
how it would handle a request for the holders’ consent, if ever required;
whether and how you can instruct it to send you securities registered in your own name so you can be a holder, if that is permitted in the future;
how it would exercise rights under the securities if there were a default or other event triggering the need for holders to act to protect their interests; and
if the securities are in book-entry form, how the depositary’s rules and procedures will affect these matters.

Global Securities
A global security is a security that represents one or any other number of individual securities held by a depositary. Generally, all securities represented by the same global securities will have the same terms.
Each security issued in book-entry form will be represented by a global security that we issue to, deposit with and register in the name of a financial institution or its nominee that we select. The financial institution that we select for this purpose is called the depositary. Unless we specify otherwise in the applicable prospectus supplement, The Depository Trust Company, New York, New York, known as DTC, will be the depositary for all securities issued in book-entry form.
A global security may not be transferred to or registered in the name of anyone other than the depositary, its nominee or a successor depositary, unless special termination situations arise. We describe those situations below under “-Special Situations When a Global Security Will Be Terminated.” As a result of these arrangements, the depositary, or its nominee, will be the sole registered owner and legal holder of all securities represented by a global security, and investors will be permitted to own only beneficial interests in a global security. Beneficial interests must be held by means of an account with a broker, bank or other financial institution that in turn has an account with the depositary or with another institution that does. Thus, an investor whose security is represented by a global security will not be a legal holder of the security, but only an indirect holder of a beneficial interest in the global security.
If the prospectus supplement for a particular security indicates that the security will be issued as a global security, then the security will be represented by a global security at all times unless and until the global security is terminated. If termination occurs, we may issue the securities through another book-entry clearing system or decide that the securities may no longer be held through any book-entry clearing system.

Special Considerations for Global Securities
As an indirect holder, an investor’s rights relating to a global security will be governed by the account rules of the investor’s financial institution and of the depositary, as well as general laws relating to securities transfers. We do not recognize an indirect holder as a holder of securities and instead deal only with the depositary that holds the global security.
If securities are issued only as global securities, an investor should be aware of the following:

an investor cannot cause the securities to be registered in his or her name, and cannot obtain non-global certificates for his or her interest in the securities, except in the special situations we describe below;
an investor will be an indirect holder and must look to his or her own bank or broker for payments on the securities and protection of his or her legal rights relating to the securities, as we describe above;
an investor may not be able to sell interests in the securities to some insurance companies and to other institutions that are required by law to own their securities in non-book-entry form;
an investor may not be able to pledge his or her interest in the global security in circumstances where certificates representing the securities must be delivered to the lender or other beneficiary of the pledge in order for the pledge to be effective;
the depositary’s policies, which may change from time to time, will govern payments, transfers, exchanges and other matters relating to an investor’s interest in the global security;
we and any applicable trustee have no responsibility for any aspect of the depositary’s actions or for its records of ownership interests in the global security, nor will we or any applicable trustee supervise the depositary in any way;


the depositary may, and we understand that DTC will, require that those who purchase and sell interests in the global security within its book-entry system use immediately available funds, and your broker or bank may require you to do so as well; and
financial institutions that participate in the depositary’s book-entry system, and through which an investor holds its interest in the global security, may also have their own policies affecting payments, notices and other matters relating to the securities.

There may be more than one financial intermediary in the chain of ownership for an investor. We do not monitor and are not responsible for the actions of any of those intermediaries.

Special Situations When a Global Security Will Be Terminated
In a few special situations described below, a global security will terminate and interests in it will be exchanged for physical certificates representing those interests. After that exchange, the choice of whether to hold securities directly or in street name will be up to the investor. Investors must consult their own banks or brokers to find out how to have their interests in securities transferred to their own names, so that they will be direct holders. We have described the rights of holders and street name investors above.
Unless we provide otherwise in the applicable prospectus supplement, the global security will terminate when the following special situations occur:
if the depositary notifies us that it is unwilling, unable or no longer qualified to continue as depositary for that global security and we do not appoint another institution to act as depositary within 90 days;
if we notify any applicable trustee that we wish to terminate that global security; or
if an event of default has occurred with regard to securities represented by that global security and has not been cured or waived.

The applicable prospectus supplement may also list additional situations for terminating a global security that would apply only to the particular series of securities covered by the prospectus supplement. When a global security terminates, the depositary, and neither we nor any applicable trustee, is responsible for deciding the names of the institutions that will be the initial direct holders.



PLAN OF DISTRIBUTION
We may sell the securities from time to time pursuant to underwritten public offerings, negotiated transactions, block trades or a combination of these methods. We may sell the securities to or through underwriters or dealers, through agents, or directly to one or more purchasers. We may distribute securities from time to time in one or more transactions:

at a fixed price or prices, which may be changed;
at market prices prevailing at the time of sale;
at prices related to such prevailing market prices; or
at negotiated prices.

We may also sell equity securities covered by this registration statement in an “at the market offering” as defined in Rule 415 under the Securities Act. Such offering may be made into an existing trading market for such securities in transactions at other than a fixed price, either:

on or through the facilities of Nasdaq or any other securities exchange or quotation or trading service on which such securities may be listed, quoted or traded at the time of sale; and/or
other than on Nasdaq or such other securities exchanges or quotation or trading services.

Such at the market offerings, if any, may be conducted by underwriters acting as principal or agent.
A prospectus supplement or supplements (and any related free writing prospectus that we may authorize to be provided to you) will describe the terms of the offering of the securities, including, to the extent applicable:

the name or names of any underwriters, dealers or agents, if any;
the purchase price of the securities and the proceeds we will receive from the sale;
any over-allotment options under which underwriters may purchase additional securities from us;
any agency fees or underwriting discounts and other items constituting agents’ or underwriters’ compensation;
any public offering price;
any discounts or concessions allowed or reallowed or paid to dealers; and
any securities exchange or market on which the securities may be listed.

Only underwriters named in the prospectus supplement are underwriters of the securities offered by the prospectus supplement.
If underwriters are used in the sale, they will acquire the securities for their own account and may resell the securities from time to time in one or more transactions at a fixed public offering price or at varying prices determined at the time of sale. The obligations of the underwriters to purchase the securities will be subject to the conditions set forth in the applicable underwriting agreement. We may offer the securities to the public through underwriting syndicates represented by managing underwriters or by underwriters without a syndicate. Subject to certain conditions, the underwriters will be obligated to purchase all of the securities offered by the prospectus supplement. Any public offering price and any discounts or concessions allowed or reallowed or paid to dealers may change from time to time. We may use underwriters with whom we have a material relationship. We will describe in the prospectus supplement, naming the underwriter, the nature of any such relationship.
We may sell securities directly or through agents we designate from time to time. We will name any agent involved in the offering and sale of securities, and we will describe any commissions we will pay the agent in the prospectus supplement. Unless the prospectus supplement states otherwise, our agent will act on a best-efforts basis for the period of its appointment.
We may authorize agents or underwriters to solicit offers by certain types of institutional investors to purchase securities from us at the public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future. We will describe the conditions to these contracts and the commissions we must pay for solicitation of these contracts in the prospectus supplement.
We may provide agents and underwriters with indemnification against civil liabilities related to this offering, including liabilities under the Securities Act, or contribution with respect to payments that the agents or underwriters may make with respect to these liabilities. Agents and underwriters may engage in transactions with, or perform services for, us in the ordinary course of business.
All securities we offer, other than common stock, will be new issues of securities with no established trading market. Any underwriters may make a market in these securities, but will not be obligated to do so and may discontinue any market making at any time without notice. We cannot guarantee the liquidity of the trading markets for any securities.


Any underwriter may engage in overallotment, stabilizing transactions, short covering transactions and penalty bids. Overallotment involves sales in excess of the offering size, which create a short position. Stabilizing transactions permit bids to purchase the underlying security so long as the stabilizing bids do not exceed a specified maximum. Short covering transactions involve purchases of the securities in the open market after the distribution is completed to cover short positions. Penalty bids permit the underwriters to reclaim a selling concession from a dealer when the securities originally sold by the dealer are purchased in a stabilizing or covering transaction to cover short positions. Those activities may cause the price of the securities to be higher than it would otherwise be. If commenced, the underwriters may discontinue any of the activities at any time. These transactions may be effected on any exchange or over-the-counter market or otherwise.
Any underwriters who are qualified market makers on Nasdaq may engage in passive market making transactions in the securities on Nasdaq in accordance with Rule 103 of Regulation M, during the business day prior to the pricing of the offering, before the commencement of offers or sales of the securities. Passive market makers must comply with applicable volume and price limitations and must be identified as passive market makers. In general, a passive market maker must display its bid at a price not in excess of the highest independent bid for such security; if all independent bids are lowered below the passive market maker’s bid, however, the passive market maker’s bid must then be lowered when certain purchase limits are exceeded. Passive market making may stabilize the market price of the securities at a level above that which might otherwise prevail in the open market and, if commenced, may be discontinued at any time.

LEGAL MATTERS
Unless otherwise indicated in the applicable prospectus supplement, certain legal matters in connection with the offering and theThe validity of the securitiesshares of our common stock being offered by this prospectus and any supplement thereto, will be passed upon by Cooley LLP, Broomfield, Colorado. Additional legal matters may beis being passed upon for us or any underwriters, dealers or agents, by counsel that we will name in the applicable prospectus supplement.

Wilson Sonsini Goodrich & Rosati, Professional Corporation, Austin, Texas.

EXPERTS
The consolidated financial statements of NewLink Genetics Corporation and its subsidiaries as of December 31, 20172019 and 2016,2018, and for each of the years in the three-year period ended December 31, 2017, and management's assessment of the effectiveness of internal control over financial reporting as of December 31, 2017,2019, have been incorporated by reference herein in reliance upon the report of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.

The financial statements of Lumos Pharma, Inc. (Private Lumos) as of December 31, 2019 and 2018, and for each of the years then ended, have been incorporated by reference herein in reliance upon the report of KPMG LLP, independent registered public accounting firm, incorporated by reference herein, and upon the authority of said firm as experts in accounting and auditing.
WHERE YOU CAN FIND MOREADDITIONAL INFORMATION
This prospectus is part of the registration statement on Form S-3 we filed with the SEC under the Securities Act. This prospectus does not contain all of the information set forth in the registration statement and the exhibits to the registration statement. For further information with respect to us and the securities we are offering under this prospectus, we refer you to the registration statement and the exhibits and schedules filed as a part of the registration statement. You should rely only on the information contained in this prospectus or incorporated by reference. We have not authorized anyone else to provide you with different information. We are not making an offer of these securities in any state where the offer is not permitted. You should not assume that the information in this prospectus is accurate as of any date other than the date on the front page of this prospectus, regardless of the time of delivery of this prospectus or any sale of the securities offered by this prospectus.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. You may read and copyOur SEC filings are available to the registration statement, as well as any other document filed by us withpublic over the SEC,Internet at the SEC’s Public Reference Roomwebsite at 100 F Street NE, Washington, D.C. 20549. You can also request copieshttp://www.sec.gov.
We make available, free of these documents by writingcharge, through our investor relations website, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, statements of changes in beneficial ownership of securities and amendments to the SECthose reports and paying a fee for the copying cost. You may obtain information on the operation of the Public Reference Room by calling the SEC at (800) SEC-0330. The SEC maintains a website that contains reports, proxy and information statements and other information regarding issuers that file electronicallyas soon as reasonably practicable after they are filed with the SEC, including NewLink.SEC. The address of the SECfor our website is www.sec.gov.

We maintain a website at www.newlinkgenetics.comhttp://www.lumos-pharma.com. Information contained in or accessible throughThe contents on our website are not part of this prospectus, and the reference to our website does not constitute aincorporation by reference into this prospectus of the information contained at that site.
This prospectus is part of a registration statement we filed with the SEC. This prospectus omits some information contained in the registration statement in accordance with SEC rules and regulations. You should review the information and exhibits in the registration statement for further information about us and our consolidated subsidiaries and our securities. Statements in this prospectus.prospectus concerning any document we filed as an exhibit to the registration statement or that we otherwise filed with the SEC are not intended to be comprehensive and are qualified by reference to these filings. You should review the complete document to evaluate these statements. You can obtain a copy of the registration statement from the SEC’s website.




INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
The SEC allows us to “incorporate by reference” information into this prospectus whichthe information we file with the SEC. This means that we can disclose important information to you by referring you to anotherthose documents. Any statement contained in a document filed separately with the SEC. The SEC file number for the documents incorporated by reference in this prospectus shall be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained herein, or in any subsequently filed document, which also is 001-35342. The documents incorporated by reference herein, modifies or supersedes such earlier statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus.
We hereby incorporate by reference into this prospectus contain important information that you should read about us.
Thethe following documents are incorporated by reference into this document:that we have filed with the SEC under the Exchange Act File No. 001-35342 (other than current reports on Form 8-K, or portions thereof, furnished under Items 2.02 or 7.01 of Form 8-K):
our Annual Report on Form 10-K for the fiscal year ended December 31, 2017,2019, filed with the SEC on March 5, 2018, as amended April 9, 2018;3, 2020;
the information specifically incorporated by reference into
our Annual Report on Form 10-K10-K/A for the fiscal year ended December 31, 2017 from our Definitive Proxy Statement on Schedule 14A,2019, filed with the SEC on April 29, 2020;
our revised definitive proxy statement on Schedule 14A filed February 13, 2020 in connection with the Company’s special meeting of stockholders;


the supplement to our proxy statement on Schedule 14A filed March 6, 2020 in connection with the Company's special meeting of stockholders;
our Current Reports on Form 8-K filed with the SEC on March 18, 2020, March 27, 2020, April 2, 2020, April 24, 2020, May 14, 2020, June 9, 2018;2020 and July 27, 2020;
our Current Report on Form 8-K/A filed with the SEC on June 1, 2020;
our Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2018, filed with the SEC on May 9, 2018;June 2, 2020;
our Current ReportsQuarterly Report on Form 8-K, to the extent the information in such reports is filed and not furnished,10-Q/A filed with the SEC on the following dates in 2018: January 8, March 13, March 14, March 15, March 21, April 6, April 16, April 17, April 25, May 1, May 15, May 16, May 25, June 4, June 20 and July 2;7, 2020; and
the description of our common stock contained in our Registration Statementregistration statement on Form 8-A filed with the SEC on November 8, 2011 (File No. 001-35342), including any amendmentsamendment or reports filed for the purposes ofreport updating thissuch description.

We also incorporate by reference into this prospectus all
All documents (other than current reports furnished under Item 2.02 or Item 7.01 of Form 8-K and exhibits filed on such form that are related to such items) that are filed by uswe file with the SEC pursuant to SectionsSection 13(a), 13(c), 14 or 15(d) of the Exchange Act (other than current reports on Form 8-K, or portions thereof, furnished under Items 2.02 or 7.01 of Form 8-K) (i) after the date of the initial filing date of the registration statement of which this prospectus forms a part and prior to the effectiveness of thesuch registration statement orand (ii) after the date of this prospectus butand prior to the termination of the offering. Theseoffering shall be deemed to be incorporated by reference in this prospectus from the date of filing of the documents, include periodic reports, such as Annual Reports on Form 10-K, Quarterly Reports on Form 10-Qunless we specifically provide otherwise. Information that we file with the SEC will automatically update and Current Reportsmay replace information previously filed with the SEC. To the extent that any information contained in any current report on Form 8-K as well as proxy statements.or any exhibit thereto, was or is furnished to, rather than filed with the SEC, such information or exhibit is specifically not incorporated by reference.
WeUpon written or oral request made to us at the address or telephone number below, we will, at no cost to the requester, provide to each person, including any beneficial owner, to whom athis prospectus is delivered, without charge upon written or oral request, a copy of any or all of the documentsinformation that arehas been incorporated by reference in this prospectus (other than an exhibit to a filing, unless that exhibit is specifically incorporated by reference into that filing), but not delivered with this prospectus. You may also access this information on our website at https://lumos-pharma.com/ by viewing the “SEC Filings” subsection of the “Investors & Media - Financial Information” menu. No additional information on our website is deemed to be part of or incorporated by reference into this prospectus but not delivered with the prospectus, including exhibits that are specifically incorporated by reference into such documents. You should direct any requests for documents to NewLink Genetics Corporation, Attention: Legal Department, 2503 South Loop Drive, Ames, Iowa 50010, telephone: (515) 296-5555.
Any statement contained herein or in a document incorporated or deemed to be incorporated by reference into this document will be deemed to be modified or superseded for purposes of the document to the extent that a statement containedprospectus. We have included our website address in this document or any other subsequently filed document that is deemed to be incorporated by reference into this document modifies or supersedes the statement.prospectus solely as an inactive textual reference.
Lumos Pharma, Inc.
4200 Marathon Blvd., Suite 200
Austin, Texas 78756
(512) 215-2630














lumos.jpg
4,146,398 Shares of Common Stock
PROSPECTUS
, 2020




PART II
INFORMATION NOT REQUIRED IN THE PROSPECTUS

Item 14.
Item 14.Other Expenses of Issuance and Distribution
The following table sets forth the costsfees and expenses other than underwriting discounts and commissions, payableincurred or expected to be incurred by us in connection with the offeringissuance and distribution of the securities being registered. All the amounts shown are estimates, except for the SEC registration fee hereby, other than underwriting discounts and FINRA filing fee.commissions.
SEC registration fee$7,971
Legal fees and expenses$35,000
Accounting fees and expenses$10,000
Printing fees and engraving expenses$
Miscellaneous expenses$
Total$52,971

SEC registration feeItem 15.$31,125
FINRA filing fee$38,000
Accounting feesIndemnification of Directors and expenses*
Legal fees and expenses*
Transfer agent, printing and miscellaneous expenses*
Total*Officers
* These fees are calculated based on the securities offered and the number of issuances and, accordingly, cannot be estimated at this time.

Item 15. Indemnification of Officers and Directors
Under Section 145 of the Delaware General Corporation Law, or DGCL, we have broad powers to indemnify our directors and officers against liabilities they may incur in such capacities, including liabilities under the Securities Act of 1933, as amended, or the Securities Act. Section 145 of the DGCL generally provides that a Delaware corporation has the power to indemnify its present and former directors, officers, employees and agents against expenses incurred by them in connection with any suit to which they are or are threatened to be made, a party by reason of their serving in such positions so long as they acted in good faith and in a manner they reasonably believed to be in or not opposed to, the best interests of the corporation and, with respect to any criminal action, they had no reasonable cause to believe their conduct was unlawful.
Our Amended and Restated Certificate of Incorporation, as amended, and Amended and Restated Bylaws ("Bylaws") provide that we will limit the liability of our directors, and may indemnify our directors and officers, to the maximum extent permitted by the DGCL. The DGCL provides that directors of a corporation will not be personally liable for monetary damages for breach of their fiduciary duties as directors, except for liability for any:

breach of their duty of loyalty to the corporation or its stockholders;

act or omission not in good faith or that involves intentional misconduct or a knowing violation of law;

unlawful payment of dividends or redemption of shares; or

transaction from which the directors derived an improper personal benefit.

These limitations of liability do not apply to liabilities arising under federal securities laws and do not affect the availability of equitable remedies such as injunctive relief or rescission.

We entered into separate indemnification agreements with our directors and officers in addition to the indemnification provided for in our Bylaws. These indemnification agreements provide, among other things, that we will indemnify our directors and officers for certain expenses, including damages, judgments, fines, penalties, settlements and costs and attorneys’ fees and disbursements, incurred by a director or officer in any claim, action or proceeding arising in his or her capacity as a director or officer of our company or in connection with service at our request for another corporation or entity. The indemnification agreements also provide for procedures that will apply in the event that a director or officer makes a claim for indemnification.

We also maintain a directors’ and officers’ insurance policy pursuant to which our directors and officers are insured against liability for actions taken in their capacities as directors and officers. We believe that these indemnification provisions and insurance are useful to attract and retain qualified directors and officers.

The underwriting agreement, if any, entered into with respect to an offering of securities registered hereunder will provide for indemnification by any underwriters of any offering, our directors and officers who sign the registration statement and our controlling persons for some liabilities, including liabilities arising under the Securities Act.



Item 16. Exhibits and Financial Statement Schedules

Exhibit NumberDescription of Document
1.1*Form of Underwriting Agreement.
3.1
Amended and Restated Certificate of Incorporation (incorporated herein by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K (File No. 001-35342), filed with the Commission on November 18, 2011).
3.2
Certificate of Amendment to Restated Certificate of Incorporation (incorporated herein by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K (File No. 001-35342), filed with the Commission on May 14, 2013.
3.3
Amended and Restated Bylaws (incorporated herein by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K (File No. 001-35342), filed with the Commission on November 18, 2011).
 4.1
Form of Common Stock Certificate of the Company (incorporated herein by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-1/A (File No. 333-171300), filed with the Commission on October 26, 2011).
4.2
Amended and Restated Investors’ Rights Agreement, by and among the Company and certain of its stockholders, dated December 1, 2010 (incorporated herein by reference to Exhibit 4.3 to the Company’s Quarterly Report on Form 10-Q (File No. 001-35342), filed with the Commission on May 10, 2012).
4.3*Specimen Preferred Stock Certificate and Form of Certificate of Designation of Preferred Stock.
4.4
4.5*Form of Debt Securities.
4.6
4.7
4.8
5.1
12.1
23.1
23.2
24.1Powers of Attorney (included on signature page).
25.1**Statement of Eligibility of Trustee under the Indenture.

*Item 16.To be filed, if applicable, by amendment or by a report filed under the Exchange Act and incorporated herein by reference.Exhibits
The following exhibits are filed as part of this registration statement.
      Incorporated by Reference
Exhibit Number Description Filed Herewith Form File/Film No. Date Filed
2.1†    8-K 2.1 9/30/2019
3.1    8-K 3.1 11/18/2011
3.2    8-K 3.1 5/14/2013
3.3    8-K 3.1 3/18/2020
3.4    8-K 3.2 3/18/2020
3.5    8-K 3.1 9/30/2019
4.1    8-K 4.1 3/18/2020
4.2    10-Q 4.3 5/10/2012
5.1  X      
23.1  X      
23.2  X      
23.3  X      
24.1  X      
           
 The schedules and exhibits to the merger agreement have been omitted pursuant to Item 601(a)(5) of Regulation S-K. A copy of any omitted schedule and/or exhibit will be furnished to the Securities and Exchange Commission upon request.
           




**Item 17.To be filed, if applicable, in accordance with the requirements of Section 305(b)(2) of the Trust Indenture Act of 1939 and Rule 5b-3 thereunder.Undertakings


Item 17. Undertakings
(a)    The undersigned registrant hereby undertakes:undertakes;

(1)    To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:statement;
(i)To include any prospectus required by Section 10(a)(3) of the Securities Act;
(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 SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume and

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

(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 Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20 percent change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement; and
(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,
(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 the undertakings set forth in paragraphs (a)(1)(i), (a)(1)(ii) and (a)(1)(iii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SECCommission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 as amended, or the Exchange Act, that are incorporated by reference in thisthe registration statement, or areis contained in a form of prospectus filed pursuant to Rule 424(b) that is part of thisthe registration statement.statement;

(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 therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.thereof;

(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.offering;

(4)    That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:
(i)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
(ii)

(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

(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 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.
(5)    That, for the purpose of determining liabilityproviding the information required by Section 10(a) of the registrant under the Securities Act of 1933 shall be deemed to any purchaserbe part of and included in the initial distributionregistration 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 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 the 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; and

(5)    The undersigned registrant hereby 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:
(i)any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;
(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;
(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
(iv)any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.
(6)    That, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant’s annual report pursuant to Sectionsection 13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Sectionsection 15(d) of the Securities Exchange Act)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.
(7) That, for purposes of determining any liability under the Securities Act:

(i)the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective; and

(ii)each post-effective amendment that contains a form of prospectus 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.

(8) 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 SEC under Section 305(b)(2) of the Trust Indenture Act.



(6)    Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the SECSecurities and Exchange Commission such indemnification is against public policy as expressed in the Securities 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 registrant will, unless in the opinion of its 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 Securities Act and will be governed by the final adjudication of such issue.





SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, the Registrantregistrant 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 Statementregistration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Ames, Iowathe City of Austin, State of Texas, on July 26, 2018.28, 2020.

NewLink Genetics CorporationLUMOS PHARMA, INC.
By: /s/ Charles/s/ Richard J. Link, Jr.Hawkins
 
Charles  Richard J. Link, Jr.
Hawkins
Chief Executive Officer
Power of Attorney
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints CharlesRichard J. Link, Jr.,Hawkins and Carl W. Langren, and each of them acting individually, as his or her true and lawful agent, proxyattorneys-in-fact and attorney-in-fact,agent, with full power of each to act alone, with full powers of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to (i) act on, sign any and all amendments to this registration statement (including post-effective amendments and any related registration statements filed pursuant to Rule 462 and otherwise), and to file the same with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, anygranting unto said attorneys-in-fact and all amendments (including post-effective amendments)agents, and full power and authority to this registration statement together with all schedulesdo and exhibits theretoperform each and any subsequent registration statement filed pursuantevery act and thing requisite and necessary to Rule 462(b) under the Securities Act of 1933, as amended, together with all schedules and exhibits thereto, (ii) act on, sign and file such certificates, instruments, agreements and other documents as may be necessary or appropriatedone in connection therewith, (iii) act on and file any supplement to any prospectus included in this registration statement or any such amendment or any subsequent registration statement filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended, and (iv) take any and all actions which may be necessary or appropriate to be done, as fully for all intents and purposes as he or she might or could do in person, hereby approving, ratifying and confirming that all that such agent, proxysaid attorneys-in-fact and attorney-in-factagents, or any of his substitutesthem or their substitute or resubstitute, may lawfully do or cause to be done by virtue thereof.hereof.
Pursuant to the requirements of the Securities Act of 1933, this Registration Statementregistration statement has been signed by the following persons in the capacities and on the dates indicated.
Signature Title Date
/s/ CharlesRichard J. Link, Jr.Hawkins President, Chief Executive Officer Chairman of Board of Directors and Director (Principal Executive Officer) July 26, 201828, 2020
CharlesRichard J. Link, Jr.Hawkins (Principal Executive Officer)  
 /s//s/ Carl W. Langren Chief Financial Officer (PrincipalJuly 28, 2020
Carl W. Langren(Principal Financial Officer) July 26, 2018
Carl W. Langren/s/ Lori D. LawleySr. VP of Finance and ControllerJuly 28, 2020
Lori D. Lawley(Principal Accounting Officer)
/s/ Emmett T. Cunningham, Jr., M.D.DirectorJuly 28, 2020
Emmett T. Cunningham, Jr., M.D.    
/s/ Lori LawleyChad A. Johnson Vice President of Finance and Controller (Principal Accounting Officer)Director July 26, 201828, 2020
Lori LawleyChad A. Johnson    
/s/ Thomas A. RaffinKevin Lalande Director July 26, 201828, 2020
Thomas A. RaffinKevin Lalande    
/s/ Joseph McCracken Director July 28, 2020
Ernest J. Talarico, IIIJoseph McCracken
/s/ Thoms A. Raffin, M.D.DirectorJuly 28, 2020
Thomas A. Raffin, M.D.    
/s/ Lota S. Zoth Director July 26, 201828, 2020
Lota S. Zoth    
/s/ Nicholas N. VahanianPresident and DirectorJuly 26, 2018
Nicholas N. Vahanian
/s/ Paolo PucciDirectorJuly 26, 2018
Paolo Pucci
/s/ Chad A. JohnsonDirectorJuly 26, 2018
Chad A. Johnson
/s/ Matthew L. ShermanDirectorJuly 26, 2018
Matthew L. Sherman



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