Company: KNSL
Filing Date: 2025-08-27
Form Type: S-3ASR
Source: 0001669162-25-000052
Chunk: 2

Company: Kinsale Capital Group, Inc.
Filing Date: 2025-08-27
Form: S-3ASR
Chunk 2
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 described in a prospectus supplement. The prospectus supplement may also add, update or change information contained in this prospectus. You should read this prospectus and the applicable prospectus supplement carefully before you make your investment decision.

We may offer and sell these securities to or through one or more underwriters, dealers and agents, or directly to purchasers, on a continuous or delayed basis.

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Investing in the offered securities involves a number of risks. See “Risk Factors” beginning on page

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of this prospectus and “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2024, our Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2025 and in other documents that we subsequently file with the Securities and Exchange Commission (“SEC”) that are incorporated by reference into this prospectus.

Our common stock is listed on the New York Stock Exchange under the trading symbol “KNSL.” Unless stated otherwise in a prospectus supplement, none of these securities will be listed on any securities exchange.

Neither the SEC nor any state securities commission or regulatory authority 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.

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The date of this prospectus is August 27, 2025.</div>

### TABLE OF CONTENTS
| ABOUT THIS PROSPECTUS               |     |  1 |
| WHERE YOU CAN FIND MORE INFORMATION |     |  2 |
| INCORPORATION BY REFERENCE          |     |  3 |
| FORWARD-LOOKING STATEMENTS          |     |  4 |
| OUR COMPANY                         |     |  5 |
| RISK FACTORS                        |     |  6 |
| USE OF PROCEEDS                     |     |  7 |
| DESCRIPTION OF SHARE CAPITAL        |     |  8 |
| DESCRIPTION OF DEPOSITARY SHARES    |     | 12 |
| SELLING SECURITYHOLDERS             |     | 14 |
| PLAN OF DISTRIBUTION                |     | 15 |
| LEGAL MATTERS                       |     | 17 |
| EXPERTS                             |     | 18 |

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### ABOUT THIS PROSPECTUS
This prospectus is part of an “automatic shelf” registration statement that we filed with the