As of November 9, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Proassurance Corporation. The largest reported stake is Vanguard Portfolio Management's, at 5.44%. 8 filings are on record since November 14, 2025 (Schedule 13G, April 29, 2026).
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Key facts
- · Reporting person: Magnetar Financial LLC · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-06-30
- · Holder: Vanguard Capital Management · Percent: 5.09% · SCHEDULE 13G
- · Holder: Vanguard Portfolio Management · Percent: 5.44% · SCHEDULE 13G
- · Holder: Dimensional Fund Advisors LP · Percent: 2.8% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
Proassurance Corporation has 8 Schedule 13D or 13G filings on record since 2025-11-14. 2 holders' latest filing reports 5% or more of common stock, par value $.01. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Vanguard Portfolio Management | 5.44% | 2,800,643 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Vanguard Capital Management | 5.09% | 2,619,108 | SCHEDULE 13G, 2026-04-30 | 2026-03-31 |
| AllianceBernstein L.P. | 3.7% | 1,910,053 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| Dimensional Fund Advisors LP | 2.8% | 1,442,782 | SCHEDULE 13G/A, 2026-04-09 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
| Magnetar Financial LLC | 0% | 0 | SCHEDULE 13D/A, 2026-06-30 | 2026-06-26 |
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More on Proassurance Corporation and the records around it.
Companies that share a holder
- AllianceBernstein L.P. also filed stake reports on 82 other companies: New Fortress Energy Inc (Nov 2026), RIVERNORTH OPPORTUNITIES FUND, INC. (Oct 2026), Trex Co Inc (Sep 2026)
- Magnetar Financial LLC also filed stake reports on 97 other companies: Blue Acquisition Corp. (Sep 2026), CENTURION ACQUISITION CORP. (Sep 2026), Churchill Capital Corp IX (Sep 2026)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
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What the Full Report on Proassurance Corporation covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Magnetar Financial LLC | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-06-30 |
| Magnetar Capital Partners LP | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-06-30 |
| Supernova Management LLC | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-06-30 |
| David J. Snyderman | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-06-30 |
The latest filing identifies Proassurance Corporation by CUSIP 74267C106 and gives its principal executive office as 100 Brookwood Place, Birmingham, AL 35209 (SCHEDULE 13D/A, 2026-06-30).
Source of funds (Item 3)
This Amendment No. 1 ("Amendment No. 1") relates to the Statement of Beneficial Ownership on Schedule 13D filed jointly by Magnetar Financial LLC, a Delaware limited liability company ("Magnetar Financial"), Magnetar Capital Partners LP, a Delaware limited partnership ("Magnetar Capital Partners"), Supernova Management LLC, a Delaware limited liability company ("Supernova Management"), and David J. Snyderman ("Mr. Snyderman") with the SEC on April 4, 2025, (as amended by this Amendment No. 1, the "Schedule 13D").Magnetar Financial LLC, SCHEDULE 13D/A, 2026-06-30
Purpose of Transaction (Item 4)
Magnetar Financial LLC
Since the filing of the Schedule 13D on April 4, 2025, on June 26, 2026, the Issuer consummated the merger (the "Merger") pursuant to which each issued and outstanding Share was cancelled and converted into the right to receive $25.00 in cash, without interest. In connection with the Merger, the Reporting Persons' 2,615,966 Shares, which consisted of 896,690 Shares sold for the benefit of PRA Master Fund; 644,313 Shares sold for the benefit of Systematic Master Fund; 290,659 Shares sold for the benefit of the Relative Value Master Fund and 784,304 Shares sold for the benefit of two Managed Accounts, were cancelled and converted into the right to receive $25.00 in cash, without interest.Item 4 of the SCHEDULE 13D/A filed 2026-06-30
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-14 | AllianceBernstein L.P. | 5.3% | SCHEDULE 13G |
| 2026-01-30 | The Vanguard Group | 10.3% | SCHEDULE 13G/A |
| 2026-02-17 | AllianceBernstein L.P. | 3.7% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-09 | Dimensional Fund Advisors LP | 2.8% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 5.44% | SCHEDULE 13G |
| 2026-04-30 | Vanguard Capital Management | 5.09% | SCHEDULE 13G |
| 2026-06-30 | Magnetar Financial LLC | 0% | SCHEDULE 13D/A |
Questions about who owns Proassurance Corporation
Who owns Proassurance Corporation?
On this page, 2 holders' latest ownership filings report 5% or more of Proassurance Corporation: Vanguard Portfolio Management (5.44%, Schedule 13G, filed 2026-04-29) and Vanguard Capital Management (5.09%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Proassurance Corporation?
By the share each holder's latest filing reports, the largest holders of Proassurance Corporation on this page are Vanguard Portfolio Management (5.44%) and Vanguard Capital Management (5.09%).
When did Vanguard Portfolio Management buy into Proassurance Corporation?
The filings give report dates, not purchase dates. The earliest filing from Vanguard Portfolio Management on this page is the Schedule 13G, filed 2026-04-29, reporting 5.44%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Proassurance Corporation
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| June 26, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.