Notice of Proposed Sale · 144

Slide Insurance Holdings, Inc.

SLDENASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Jul 6, 2026Accepted Jul 6, 2026, 6:17 PM EDTFiling CIK 1886428Accession 0001958244-26-000430

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: Slide Insurance Holdings, Inc.
Issuer CIK: 0001886428
SEC file number: 001-42707
Phone: 1-813-748-2030
Person for whose account securities are to be sold: GRM FAMILY LIMITED PARTNERSHIP
Relationships to issuer: Director
Street: 4221 W. Boy Scout Blvd.
Street (continued): Suite 200
City: Tampa
State / country code: FL
Postal code: 33607

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	648,876	13,606,929.72	114,559,246	07/06/2026	NASD	Goldman Sachs & Co. LLC

Broker / market maker — proposed row 1, entry 1

Name: Goldman Sachs & Co. LLC
Street: 200 West Street
City: New York
State / country code: NY
Postal code: 10282

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Common	09/19/2021	Acquired from issuer in private transaction	Slide Insurance LLC	648,876	N	09/19/2021	None

Sales reported in the preceding three months

Sales reported in the preceding three months · 4 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
GRM FAMILY LIMITED PARTNERSHIP	Common	04/07/2026	28,212	508,453.59
GRM FAMILY LIMITED PARTNERSHIP	Common	05/06/2026	28,212	527,468.48
GRM FAMILY LIMITED PARTNERSHIP	Common	04/06/2026	28,212	509,455.12
GRM FAMILY LIMITED PARTNERSHIP	Common	05/05/2026	28,212	523,259.25

Seller — prior-sale row 1, entry 1

Name: GRM FAMILY LIMITED PARTNERSHIP
Street: 4221 W. Boy Scout Blvd.
Street (continued): Suite 200
City: Tampa
State / country code: FL
Postal code: 33607

Seller — prior-sale row 2, entry 1

Name: GRM FAMILY LIMITED PARTNERSHIP
Street: 4221 W. Boy Scout Blvd.
Street (continued): Suite 200
City: Tampa
State / country code: FL
Postal code: 33607

Seller — prior-sale row 3, entry 1

Name: GRM FAMILY LIMITED PARTNERSHIP
Street: 4221 W. Boy Scout Blvd.
Street (continued): Suite 200
City: Tampa
State / country code: FL
Postal code: 33607

Seller — prior-sale row 4, entry 1

Name: GRM FAMILY LIMITED PARTNERSHIP
Street: 4221 W. Boy Scout Blvd.
Street (continued): Suite 200
City: Tampa
State / country code: FL
Postal code: 33607

Prior-sale reporting

Nothing to report for the preceding three months: N

Remarks

The sales of shares set forth herein are made in connection with a selling plan dated 12/12/2025, that is intended to comply with Rule 10b5-1(c). All shares to be sold by GRM Family Limited Partnership.

Notice signature

Notice date: 07/06/2026
Signed: Goldman Sachs & Co. LLC on behalf of Robert D. Gries Jr.
Plan adoption dates: 12/12/2025

Company context

We are focused on delivering strong and consistent underwriting results, with a proven track record of profitability. We believe our proprietary AI-driven data analytics and underwriting process allows us to better select insurance policies, including those we assume from Citizens and other private insurers, leading to strong risk-adjusted returns. We focus on profitability of each individual policy and focus on writing profitable business in our markets. In addition, we have a full stack, vertically integrated platform with key functions managed in-house including underwriting, actuarial analysis, risk management, claims, product development and litigation. This allows us to manage risk, limit losses and provide consistent and quality customer service to our policyholders. Our integrated claims services model allows us to quickly assess claims and limit additional damage by remediating any potential issues, further allowing us to control loss costs following an event. As a result of our integrated and technology-enabled approach, for the years ended December 31, 2023 and 2024, we generated a consolidated net-attritional loss ratio, which we define as direct and assumed loss and loss adjustment expense, excluding catastrophe losses, less any reinsurance recoveries, divided by net premiums earned, of 34.1% and 26.2%, respectively.

Current securities

SLDENASDAQ · EQUITY · Current

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