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[S-8 POS] IGM Biosciences, Inc. SEC Filing

Filing Impact
(Low)
Filing Sentiment
(Neutral)
Form Type
S-8 POS
Rhea-AI Filing Summary

IGM Biosciences completed a merger into a subsidiary of Concentra Biosciences and, as a result, has terminated and withdrawn unissued securities from multiple Form S-8 registration statements. The Registrant entered into a merger agreement on July 1, 2025, and on August 14, 2025 Merger Sub was merged into the company with the company surviving as a wholly owned subsidiary of Parent.

Under the Merger each outstanding share (other than treasury shares, shares owned by Parent/Merger Sub, and shares of stockholders who validly exercised appraisal rights) was converted into the right to receive $1.247 in cash per share plus one non-transferable contractual contingent value right per share. The company removed all unsold securities registered under the referenced S-8 registration statements and terminated their effectiveness.

IGM Biosciences ha completato una fusione con una controllata di Concentra Biosciences e, di conseguenza, ha annullato e ritirato titoli non emessi da più dichiarazioni di registrazione sul modulo S-8. Il Registrante ha sottoscritto l'accordo di fusione il 1° luglio 2025 e il 14 agosto 2025 Merger Sub è stata assorbita dalla società, che è sopravvissuta come controllata interamente posseduta da Parent.

In base alla Fusione, ogni azione in circolazione (escluse le azioni proprie, le azioni possedute da Parent/Merger Sub e le azioni dei soci che hanno validamente esercitato il diritto di valutazione) è stata convertita nel diritto a ricevere $1.247 in contanti per azione più un diritto contrattuale contingente non trasferibile per azione. La società ha rimosso tutti i titoli invenduti registrati in base alle dichiarazioni S-8 menzionate e ne ha dichiarato l'efficacia terminata.

IGM Biosciences completó una fusión con una subsidiaria de Concentra Biosciences y, como resultado, ha anulado y retirado valores no emitidos de múltiples declaraciones de registro Form S-8. El Registrante celebró un acuerdo de fusión el 1 de julio de 2025 y, el 14 de agosto de 2025, Merger Sub se fusionó en la compañía, que subsistió como una subsidiaria de propiedad total de Parent.

En virtud de la Fusión, cada acción en circulación (excepto las acciones en tesorería, las acciones en poder de Parent/Merger Sub y las acciones de los accionistas que ejercieron válidamente los derechos de tasación) se convirtió en el derecho a recibir $1.247 en efectivo por acción más un derecho contractual contingente no transferible por acción. La compañía eliminó todos los valores no vendidos registrados bajo las declaraciones S-8 referidas y terminó su vigencia.

IGM 바이오사이언스는 Concentra Biosciences의 자회사로 합병을 완료했으며, 그 결과 여러 Form S-8 등록서류에 기재된 미발행 증권을 소거·철회했습니다. 등록인은 2025년 7월 1일에 합병계약을 체결했으며, 2025년 8월 14일 Merger Sub가 회사에 합병되어 회사는 Parent의 전액 출자 자회사로 존속했습니다.

합병에 따라 모든 발행주(자기주, Parent/Merger Sub가 보유한 주 및 적법하게 가액청구권을 행사한 주주는 제외)는 주당 현금 $1.247와 주당 이전 불가능한 계약상 조건부 가치권 1개를 받을 권리로 전환되었습니다. 회사는 참조된 S-8 등록서류에 등록된 미판매 증권을 모두 제거하고 그 효력을 종료했습니다.

IGM Biosciences a finalisé une fusion dans une filiale de Concentra Biosciences et, en conséquence, a annulé et retiré des titres non émis figurant dans plusieurs déclarations d'enregistrement Form S-8. Le Déclarant a conclu un accord de fusion le 1er juillet 2025 et, le 14 août 2025, Merger Sub a été fusionnée dans la société, qui a subsisté en tant que filiale détenue intégralement par Parent.

En vertu de la Fusion, chaque action en circulation (à l'exception des actions propres, des actions détenues par Parent/Merger Sub et des actions des actionnaires ayant valablement exercé leurs droits d'expertise) a été convertie en le droit de recevoir 1,247 $ en espèces par action plus un droit contractuel conditionnel non transférable par action. La société a retiré tous les titres invendus enregistrés sous les déclarations S-8 mentionnées et a mis fin à leur effet.

IGM Biosciences hat eine Fusion in eine Tochtergesellschaft von Concentra Biosciences abgeschlossen und infolgedessen nicht emittierte Wertpapiere aus mehreren Form S-8-Registrierungserklärungen annulliert und zurückgezogen. Der Eintragende schloss am 1. Juli 2025 einen Fusionsvertrag ab, und am 14. August 2025 wurde Merger Sub in die Gesellschaft eingegliedert, wobei die Gesellschaft als hundertprozentige Tochtergesellschaft von Parent fortbestand.

Im Rahmen der Fusion wurde jede ausstehende Aktie (mit Ausnahme von eigenen Stammaktien, Aktien, die von Parent/Merger Sub gehalten werden, und Aktien von Aktionären, die fristgerecht Bewertungsrechte ausgeübt haben) in das Recht umgewandelt, $1,247 in bar pro Aktie sowie ein nicht übertragbares vertragliches bedingtes Wertrecht pro Aktie zu erhalten. Die Gesellschaft hat alle unveräußerten Wertpapiere, die unter den genannten S-8-Registrierungserklärungen registriert waren, entfernt und deren Wirksamkeit beendet.

Positive
  • Merger completed, with Registrant surviving as a wholly owned subsidiary, providing clear post-closing status
  • Share conversion terms disclosed: each eligible share converted into $1.247 cash plus one contingent value right
  • Administrative compliance with undertaking to remove unsold registered securities by filing post-effective amendments
Negative
  • No details provided about the economic terms or potential value of the non-transferable contractual contingent value rights
  • Filing does not disclose impacts on incentive plans, outstanding option treatment, or exact number of shares converted versus excluded
  • No financial results or pro forma effects of the Merger are included in this filing

Insights

TL;DR: The filing documents completion of a merger and the administrative withdrawal of S-8 registrations after conversion of equity into cash and contingent rights.

The post-effective amendments are procedural and follow the Merger's economic terms disclosed: outstanding common shares were converted into $1.247 cash plus a non-transferable contingent value right, with exceptions for treasury-held, Parent-held, and appraisal-exercised shares. Removing unsold S-8-registered securities is consistent with the company becoming a wholly owned subsidiary and no longer issuing equity under those plans. This filing does not disclose further financial results, earn-outs, or the structure/value of the contingent value rights beyond their existence.

TL;DR: Governance actions reflect post-closing housekeeping—termination of equity offerings and removal of remaining registered shares after acquisition.

The amendments satisfy the registrant's undertaking in each registration statement to withdraw unsold securities upon termination of the offering. The disclosure specifies which share categories were excluded from conversion treatment. No additional governance changes, dilutive calculations, or amendments to incentive plans are disclosed in this filing, limiting assessment to the described post-closing administrative steps.

IGM Biosciences ha completato una fusione con una controllata di Concentra Biosciences e, di conseguenza, ha annullato e ritirato titoli non emessi da più dichiarazioni di registrazione sul modulo S-8. Il Registrante ha sottoscritto l'accordo di fusione il 1° luglio 2025 e il 14 agosto 2025 Merger Sub è stata assorbita dalla società, che è sopravvissuta come controllata interamente posseduta da Parent.

In base alla Fusione, ogni azione in circolazione (escluse le azioni proprie, le azioni possedute da Parent/Merger Sub e le azioni dei soci che hanno validamente esercitato il diritto di valutazione) è stata convertita nel diritto a ricevere $1.247 in contanti per azione più un diritto contrattuale contingente non trasferibile per azione. La società ha rimosso tutti i titoli invenduti registrati in base alle dichiarazioni S-8 menzionate e ne ha dichiarato l'efficacia terminata.

IGM Biosciences completó una fusión con una subsidiaria de Concentra Biosciences y, como resultado, ha anulado y retirado valores no emitidos de múltiples declaraciones de registro Form S-8. El Registrante celebró un acuerdo de fusión el 1 de julio de 2025 y, el 14 de agosto de 2025, Merger Sub se fusionó en la compañía, que subsistió como una subsidiaria de propiedad total de Parent.

En virtud de la Fusión, cada acción en circulación (excepto las acciones en tesorería, las acciones en poder de Parent/Merger Sub y las acciones de los accionistas que ejercieron válidamente los derechos de tasación) se convirtió en el derecho a recibir $1.247 en efectivo por acción más un derecho contractual contingente no transferible por acción. La compañía eliminó todos los valores no vendidos registrados bajo las declaraciones S-8 referidas y terminó su vigencia.

IGM 바이오사이언스는 Concentra Biosciences의 자회사로 합병을 완료했으며, 그 결과 여러 Form S-8 등록서류에 기재된 미발행 증권을 소거·철회했습니다. 등록인은 2025년 7월 1일에 합병계약을 체결했으며, 2025년 8월 14일 Merger Sub가 회사에 합병되어 회사는 Parent의 전액 출자 자회사로 존속했습니다.

합병에 따라 모든 발행주(자기주, Parent/Merger Sub가 보유한 주 및 적법하게 가액청구권을 행사한 주주는 제외)는 주당 현금 $1.247와 주당 이전 불가능한 계약상 조건부 가치권 1개를 받을 권리로 전환되었습니다. 회사는 참조된 S-8 등록서류에 등록된 미판매 증권을 모두 제거하고 그 효력을 종료했습니다.

IGM Biosciences a finalisé une fusion dans une filiale de Concentra Biosciences et, en conséquence, a annulé et retiré des titres non émis figurant dans plusieurs déclarations d'enregistrement Form S-8. Le Déclarant a conclu un accord de fusion le 1er juillet 2025 et, le 14 août 2025, Merger Sub a été fusionnée dans la société, qui a subsisté en tant que filiale détenue intégralement par Parent.

En vertu de la Fusion, chaque action en circulation (à l'exception des actions propres, des actions détenues par Parent/Merger Sub et des actions des actionnaires ayant valablement exercé leurs droits d'expertise) a été convertie en le droit de recevoir 1,247 $ en espèces par action plus un droit contractuel conditionnel non transférable par action. La société a retiré tous les titres invendus enregistrés sous les déclarations S-8 mentionnées et a mis fin à leur effet.

IGM Biosciences hat eine Fusion in eine Tochtergesellschaft von Concentra Biosciences abgeschlossen und infolgedessen nicht emittierte Wertpapiere aus mehreren Form S-8-Registrierungserklärungen annulliert und zurückgezogen. Der Eintragende schloss am 1. Juli 2025 einen Fusionsvertrag ab, und am 14. August 2025 wurde Merger Sub in die Gesellschaft eingegliedert, wobei die Gesellschaft als hundertprozentige Tochtergesellschaft von Parent fortbestand.

Im Rahmen der Fusion wurde jede ausstehende Aktie (mit Ausnahme von eigenen Stammaktien, Aktien, die von Parent/Merger Sub gehalten werden, und Aktien von Aktionären, die fristgerecht Bewertungsrechte ausgeübt haben) in das Recht umgewandelt, $1,247 in bar pro Aktie sowie ein nicht übertragbares vertragliches bedingtes Wertrecht pro Aktie zu erhalten. Die Gesellschaft hat alle unveräußerten Wertpapiere, die unter den genannten S-8-Registrierungserklärungen registriert waren, entfernt und deren Wirksamkeit beendet.

As filed with the Securities and Exchange Commission on August 14, 2025

Registration No. 333-233826
Registration No. 333-237411
Registration No. 333-248111
Registration No. 333-254877
Registration No. 333-263927
Registration No. 333-270991
Registration No. 333-277744
Registration No. 333-285602

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



POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-233826
POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-237411
POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-248111
POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-254877
POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-263927
POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-270991
POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-277744
POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 333-285602

FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933



IGM BIOSCIENCES, INC.
(Exact name of registrant as specified in its charter)



Delaware
 
77-0349194
(State or other jurisdiction of
incorporation or organization)
 
(IRS employer
identification number)

4747 Executive Drive, Suite 210
San Diego, California 92121
(Address of Principal Executive Offices, including Zip Code)



Amended and Restated 2018 Omnibus Incentive Plan
Amended and Restated 2019 Employee Stock Purchase Plan
Amended and Restated 2010 Stock Plan
(Full title of the Plans)



Michael Hearne
Chief Financial Officer
IGM Biosciences, Inc.
4747 Executive Drive, Suite 210
San Diego, California 92121
(858) 281-5372
(Name, Address and Telephone Number, including Area Code, of Agent for Service)

Copies to:

Ryan A. Murr
Gibson, Dunn & Crutcher LLP
One Embarcadero Center Suite 2600
San Francisco, California 94111
(415) 393-8200

Tony Jeffries
Robert T. Ishii
Jennifer Knapp
Ethan Lutske
Wilson Sonsini Goodrich & Rosati, P.C.
650 Page Mill Road
Palo Alto, California 94304
(650) 493-9300



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 definitions of “large accelerated filer, “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer
 
 
Accelerated filer
 
       
Non-accelerated filer
 
 
Smaller reporting company
 
       
       
Emerging growth company
 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. 




EXPLANATORY NOTE

DEREGISTRATION OF UNSOLD SECURITIES

These Post-Effective Amendments (the “Post-Effective Amendments”) filed by IGM Biosciences, Inc., a Delaware corporation (the “Registrant”), to deregister all shares of the Registrant’s common stock, $0.01 par value per share (the “Shares”), remaining unissued under the following Registration Statements on Form S-8 (each, a “Registration Statement”, and collectively, the “Registration Statements”) filed by the Registrant with the U.S. Securities and Exchange Commission (the “Commission”).


Registration Statement on Form S-8 (No. 333-233826) pertaining to the registration of (i) 4,372,807 Shares issuable under the Amended and Restated 2018 Omnibus Incentive Plan (the “2018 Plan”), (ii) 280,000 Shares issuable under the Amended and Restated 2019 Employee Stock Purchase Plan (the “ESPP”) and (iii) 595,832 Shares issuable under the Amended and Restated 2010 Stock Plan.

Registration Statement on Form S-8 (No. 333-237411) pertaining to the registration of (i) 964,487 Shares issuable under the 2018 Plan and (ii) 241,121 Shares issuable under the ESPP.

Registration Statement on Form S-8 (No. 333-248111) pertaining to the registration of (i) 257,248 Shares issuable under the 2018 Plan and (ii) 64,312 Shares issuable under the ESPP.

Registration Statement on Form S-8 (No. 333-254877) pertaining to the registration of (i) 1,278,965 Shares issuable under the 2018 Plan and (ii) 319,741 Shares issuable under the ESPP.

Registration Statement on Form S-8 (No. 333-263927) pertaining to the registration of (i) 1,299,920 Shares issuable under the 2018 Plan and (ii) 324,980 Shares issuable under the ESPP.

Registration Statement on Form S-8 (No. 333-270991) pertaining to the registration of (i) 1,723,292 Shares issuable under the 2018 Plan and (ii) 430,823 Shares issuable under the ESPP.

Registration Statement on Form S-8 (No. 333-277744) pertaining to the registration of (i) 4,507,245 Shares issuable under the 2018 Plan and (ii) 560,000 Shares issuable under the ESPP.

Registration Statement on Form S-8 (No. 333-285602) pertaining to the registration of (i) 2,385,497 Shares issuable under the 2018 Plan and (ii) 560,000 Shares issuable under the ESPP.

The Registrant is filing these Post-Effective Amendments to withdraw and remove any unissued and unsold securities issuable by Registration pursuant to the above-referenced Registration Statements.

On July 1, 2025, the Registrant entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Concentra Biosciences, LLC, a Delaware limited liability company (“Parent”), and Concentra Merger Sub V, Inc., a Delaware corporation and wholly owned subsidiary of Parent (“Merger Sub”). Pursuant to the Merger Agreement, on August 14, 2025, Merger Sub was merged with and into the Registrant with the Registrant surviving as a wholly owned subsidiary of Parent (the “Merger”). In the Merger, each share of Common Stock (the “Shares”) (other than (i) Shares owned or held in the Company’s treasury immediately prior to the Effective Time, (ii) Shares owned directly or indirectly by Parent or Merger Sub immediately prior to the Effective Time and (iii) Shares held by any stockholder of the Registrant who properly exercised appraisal rights under Delaware law) was converted into the right to receive (i) $1.247 per Share in cash and (ii) one non-transferable contractual contingent value right for each Share.

As a result of the Merger, the Registrant has terminated all offerings of its securities pursuant to the Registration Statements. In accordance with an undertaking made by the Registrant in each of the Registration Statements to remove from registration, by means of a post-effective amendment, any of the securities that had been registered for issuance that remain unsold at the termination of the offerings, the Registrant hereby removes from registration all such securities registered under the Registration Statements that remain unsold as of the date hereof and terminates the effectiveness of the Registration Statements.



SIGNATURE

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused these Post-Effective Amendments to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Diego, State of California, on August 14, 2025. No other person is required to sign these Post-Effective Amendment to the Registration Statements in reliance on Rule 478 of the Securities Act of 1933, as amended.

 
IGM BIOSCIENCES, INC.
   
 
By: /s/ Michael Hearne
 
Name: Michael Hearne
Title: Chief Financial Officer



FAQ

What did IGM Biosciences (IGMS) shareholders receive in the merger?

According to the filing, each eligible common share was converted into $1.247 in cash and one non-transferable contractual contingent value right per share.

Why did IGM file post-effective amendments to Form S-8?

The company removed from registration any unissued and unsold securities under the referenced S-8 registration statements as required after termination of the offerings due to the Merger.

Were any shares excluded from conversion in the Merger?

Yes. Shares owned by the company as treasury stock, shares owned directly or indirectly by Parent or Merger Sub immediately prior to the Effective Time, and shares held by stockholders who properly exercised appraisal rights were excluded.

Does this filing explain the value of the contingent value rights?

No. The filing only states that one non-transferable contractual contingent value right was issued per share; it does not provide details on valuation or payout conditions.

Did the filing disclose changes to the company’s equity incentive plans?

No. The filing lists the S-8 registration statements and the number of shares previously registrable under various plans, but it does not describe amendments or the post-merger treatment of outstanding awards beyond the general conversion language.
Igm Biosciences, Inc.

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