Thrive Capital Partners III, L.P. - 18 Sep 2026 SCHEDULE 13D/A Report for Oscar Health, Inc. Class A Common Stock, $0.00001 par value per share (OSCR)

Filing manager
Thrive Capital Partners III, L.P.
Reporting owner
Joshua Kushner
Security
Oscar Health, Inc. Class A Common Stock, $0.00001 par value per share
Beneficially owned shares
37,525,451 shares
Ownership signal CIK-linked ownership evidence from parsed SEC filings. 2 signals
Large-stake signal

Form

SCHEDULE 13D/A

Active or control-oriented beneficial ownership filing.

Ownership

12%

Beneficial ownership of this reported class.

Shares

37,525,451 shares

Shares beneficially owned as disclosed.

Event date

18 Sep 2026

Date tied to the ownership event or amendment.

Accepted by SEC

18 Sep 2026

EDGAR acceptance date.

How to read this large-stake filing
  • Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
  • Compare this filing with the holder history and issuer page before treating the percentage as a current position.
  • Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership
12%
Subject security Names, identifiers, and filing context for this profile. 2 source fields
Symbol
OSCR
Shares outstanding
310,127,694 shares
Source evidence Original filing metadata and source links for verification. 4 source fields
SEC form
SCHEDULE 13D/A
Accepted by SEC
18 Sep 2026, 20:18:33 UTC
Event date
18 Sep 2026
Source filing
View source filing

Key filing fact

Thrive Capital Partners III, L.P. disclosed 12% ownership in Oscar Health, Inc. Class A Common Stock, $0.00001 par value per share (OSCR) on 18 Sep 2026.

Key facts

  • Thrive Capital Partners III, L.P. filed SCHEDULE 13D/A for Oscar Health, Inc. Class A Common Stock, $0.00001 par value per share (OSCR).
  • Disclosed ownership: 12%.
  • Date of event: 18 Sep 2026.

Change

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 18 Sep 2026, 20:18.

Research use

  • This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
  • Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

View source filing

Reporting persons

Disclosed reporting parties (16)

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name Ownership Shares owned Sole voting power Shared voting power Signature Title CIK
Thrive Capital Partners II, L.P. 1.7% 4,779,730 4,779,730 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners II GP, LLC, its general partner
Thrive Partners II GP, LLC 1.7% 4,779,730 4,779,730 0 /s/ Joshua Kushner Joshua Kushner, Managing Member
Thrive Capital Partners III, L.P. 6% 17,535,258 17,535,258 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners III GP, LLC, its general partner 0001556346
Claremount TW, L.P. 0.2% 593,021 593,021 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners III GP, LLC, its general partner
Thrive Partners III GP, LLC 6.2% 18,128,279 18,128,279 0 /s/ Joshua Kushner Joshua Kushner, Managing Member
Thrive Capital Partners V, L.P. 0.4% 1,040,704 1,040,704 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners V GP, LLC, its general partner
Claremount V Associates, L.P. 0% 19,239 19,239 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners V GP, LLC, its general partner
Thrive Partners V GP, LLC 0.4% 1,059,943 1,059,943 0 /s/ Joshua Kushner Joshua Kushner, Managing Member
Thrive Capital Partners VI Growth, L.P. 0.9% 2,498,513 2,498,513 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners VI GP, LLC, its general partner
Claremount VI Associates, L.P. 0% 48,982 48,982 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners VI GP, LLC, its general partner
Thrive Partners VI GP, LLC 0.9% 2,547,495 2,547,495 0 /s/ Joshua Kushner Joshua Kushner, Managing Member
Thrive Capital Partners VII Growth, L.P. 3.7% 10,424,005 10,424,005 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners VII Growth GP, LLC, its general partner
Thrive Partners VII Growth GP, LLC 3.7% 10,424,005 10,424,005 0 /s/ Joshua Kushner Joshua Kushner, Managing Member
Claremount VII Associates, L.P. 0% 125,632 125,632 0 /s/ Joshua Kushner Joshua Kushner, Managing Member of Thrive Partners VII GP, LLC, its general partner
Thrive Partners VII GP, LLC 0% 125,632 125,632 0 /s/ Joshua Kushner Joshua Kushner, Managing Member
Joshua Kushner 12% 37,525,451 37,525,451 0 /s/ Joshua Kushner Joshua Kushner
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