#1Investor Presentation First & Second Quarter 2023 Update August 21, 2023 American Coastal INSURANCE CORPORATION™#2Company Overview ACIC is a specialty underwriter of catastrophe exposed property insurance. American Coastal Insurance Corp. (Nasdaq: ACIC - effective 8.15.2023) is the insurance holding company for two P&C carriers: American Coastal Insurance Company (AmCoastal) and Interboro Insurance Company (IIC) along with other operating affiliates. AmCoastal has the #1 market share of commercial residential property insurance (commercial lines) in Florida with roughly 4,600 policies and $617 million of premium in-force. IIC's homeowners & fire insurance products (personal lines) are written exclusively in New York with approximately 15,800 policies and $33 million of premium in-force. Specialty Commercial Property AmCoast mCoastal Total Assets: ACIC as of June 30, 2023 $1.44 billion $112.4 million Annualized Revenue: $339.2 million 84 Total Equity: Employees: Headquarters: Credit Rating: St. Petersburg, FL BB+ (Kroll) Specialty Homeowners INTERBORO INSURANCE™ A American Coastal INSURANCE CORPORATION™ 2#3Executive Summary Q2-23 Results • Non-GAAP Core Income of $26.2m ($0.60) increased $36.9m (345%) from a loss of -$10.7m (-$0.25) y/y excluding discontinued operations. • • Net income from continuing operations of $20.4m ($0.47) improved $33.7m (253%) from a loss of -$13.3m (-$0.31) last year driven by strong underwriting performance in commercial lines. Our combined ratio of 67.7% improved from 76.9% in the same period last year. Gross premiums earned of $158.2m grew $28.7m (+22%) due to improving rate adequacy in commercial lines. Current year catastrophe losses of $6.5m were mostly offset by favorable prior year reserve development of $5.2m in the current quarter. Investment losses of -$5.2m (-$0.12) net of tax were incurred due to the sale of fixed maturity investments required to fund loss and reinsurance payment obligations during the period but are not expected to recur. Stockholders' equity attributable to ACIC as of June 30, 2023, increased to $112.4m or $2.59 per share and $3.07 per share excluding unrealized losses in accumulated other comprehensive income. Other Highlights Successfully completed our 6/1/23 catastrophe reinsurance programs for AmCoastal & IIC. AmCoastal's retention is $10m and UPC Re has a maximum retention of $2.25m if AmCoastal's Layer 1 is exhausted. IIC's is $3m per occurrence and UPC Re has no exposure to IIC's program. Our name changed from United Insurance Holdings Corp. (Nasdaq: UIHC) to American Coastal Insurance Corp. with our new ticker symbol (Nasdaq: ACIC) becoming effective on August 15, 2023. Errors related to discontinued operations & income taxes required us to restate results for 1Q-23 and created differences from our earnings release on August 10, 2023. American Coastal INSURANCE CORPORATION™#42Q-23 Summary Results A combined ratio of 67.7% combined with premium growth fueled significant improvements y/y. $ in thousands, except per share amounts Net income (loss) per diluted share (EPS) Q2-23 Q2-221 Change 2023 $ 17,779 $ (69,029) n/m $ 285,059 20221 $ (102,201) Change n/m $ 0.42 $ (1.60) $ 6.52 $ (2.37) Reconciliation to core income (loss), net of tax: Investment gains (losses) $ (5,201) $ (1,950) $ (4,892) $ (2,529) Amortization of intangible assets $ (641) $ (641) $ (1,282) $ (1,283) Gain (loss) from discontinued operations $ (2,573) $ (55,744) $ 234,340 $ (88,728) Total adjustments $ (8,415) $ (58,335) $ 228,166 $ (92,539) Core income (loss) $ per diluted share (CEPS) $ 0.60 $ 26,194 $ (10,693) (0.25) 345.0% $ 56,893 $ (9,660) 689.0% $ 1.30 $ (0.22) Net loss & LAE ratio 25.1% 21.7% 21.9% 33.0% Net expense ratio 42.6% 55.2% 43.0% 55.3% Combined ratio 67.7% 76.9% (9.2) pts | 64.9% 88.3% (23.4) pts Less: Net current year catastrophe loss & LAE 7.9% -3.3% 5.6% 2.8% Less: Net (favorable) unfavorable reserve development -6.2% -6.0% -4.9% -5.7% Underlying combined ratio 66.0% 86.2% (20.2) pts 64.1% 91.2% (27.1) pts 1 2022 amounts recast for discontinued operations. American Coastal INSURANCE CORPORATION™ 4#52Q-23 Detailed Results Investment losses and higher catastrophe loss & reinsurance costs were overcome by top line growth. $ in millions Gross Premiums Earned Q2-221 Change Ceded Premiums Earned Net Premiums Earned Investment & Other Income Unrealized G(L) on Equities Total Revenue Q2-23 $ 158.2 % Chg I 1 YTD 6.30.23 Prior YTD Change % Chg $ 129.5 28.7 22.2% $ 302.7 $ 252.2 50.5 20.0% (75.0) (65.0) (10.0) 15.4% T (132.2) (129.9) (2.2) 1.7% 83.2 64.5 18.7 29.0% I 170.5 122.3 48.2 39.4% (4.0) 1.8 (5.8) -322.2% (1.5) 3.2 (4.7) -146.9% 0.1 (2.4) 2.5 -104.2% 0.6 (3.2) 3.8 -118.8% 79.3 63.9 15.4 24.1% 169.6 122.3 47.3 38.7% Underlying Loss & LAE 19.5 19.9 (0.4) -2.0% 36.5 43.9 (7.4) -16.9% Current year CAT Loss & LAE 6.5 (2.1) 8.7 -414.3% 9.2 3.4 5.8 170.6% Prior year development (F)/U (5.2) (3.8) (1.4) 36.8% (8.3) (6.9) (1.5) 21.7% Net Loss & LAE 20.9 14.0 6.9 49.3% 37.3 40.3 (3.0) -7.4% Operating Expense 35.4 35.6 (0.2) -0.6% 73.3 67.7 5.8 8.6% 56.3 49.6 6.7 13.5% 110.7 108.0 2.5 2.3% Total Expenses (excluding interest) Earnings from continuing operations before tax Net income from continuing operations SS $ 21.1 $ $ 20.4 $ 12.2 $ (13.3) $ 8.9 33.7 70.1% 253.4% est es 54.9 S $ 11.2 $ 43.7 50.7 $ (13.6) $ 64.3 390.2% 472.8% Net Loss Ratio 25.1% 21.7% 3.4 pts 21.9% 33.0% -11.1 pts Net Expense Ratio 42.6% 55.2% -12.6 pts 43.0% 55.3% -12.3 pts Combined Ratio 67.7% 76.9% -9.2 pts 64.9% 88.3% -23.4 pts Less: Current year catastrophe loss & LAE 7.9% -3.3% 11.2 pts 5.4% 2.8% 2.6 pts Less: Prior year reserve development (F)/U Underlying Combined Ratio -6.2% -6.0% -0.2 pts -4.9% -5.7% 0.8 pts 66.0% 86.2% -20.2 pts 64.4% 91.2% -26.8 pts 1 2022 amounts recast for discontinued operations. American Coastal A INSURANCE CORPORATION™#62Q-23 Segment Results Corrections made to discontinued operations impacted PL servicing revenue & expense QTD & YTD. Three Months Ended Jun 30, 2023 Six Months Ended Jun 30, 2023 $ in millions CL PL Other Total CL PL Other Gross Premiums Earned Ceded Premiums Earned Net Premiums Earned $ 145.8 $ 12.4 $ (71.8) (3.2) $ 158.2 (75.0) $ 277.8 $ 24.8 $ (125.2) (7.0) Total $ 302.7 (132.2) 74.0 9.2 83.2 152.6 17.8 170.5 Investment & other revenue (4.9) 0.9 (4.0) (3.1) 1.6 (1.5) Unrealized G(L) on Equities 0.1 0.0 0.1 0.6 0.0 0.6 Total Revenue 69.3 10.0 79.3 150.1 19.4 169.6 Underlying Loss & LAE 15.3 4.2 19.5 29.9 6.5 36.5 Current year CAT Loss & LAE 6.2 0.3 6.5 8.3 0.9 9.2 Prior year development (5.3) 0.2 (5.2) (8.1) (0.2) (8.3) Total Loss 16.2 4.7 20.9 30.1 7.2 37.3 Operating & Interest Expense 27.7 7.4 3.0 38.1 55.8 17.1 6.0 78.8 Total Expenses 43.9 12.1 3.0 59.0 85.8 24.3 6.0 116.1 Other income (loss) 0.8 0.8 1.6 (0.2) 1.4 Income (Loss) before tax $ 25.4 $ (1.3) $ (3.0) 21.1 I | $ 64.3 $ (3.2) $ (6.2) 54.9 CL Commercial lines PL - Personal lines American Coastal INSURANCE CORPORATION™ A#7Summary of Income Statement Changes $ in millions except per share amounts Three Months Ended March 31, 2023 10-Q/A Three Months Ended June 30, 2023 Six Months Ended June 30, 2023 10-Q Change % Chg 10-Q ER Change % Chg 10-Q ER Change % Chg Gross Premiums Earned Ceded Premiums Earned Net Premiums Earned Investment & other revenue $ 144.5 $ 144.5 0.0% $ 158.2 $ 158.2 0.0% $ 302.7 $ 302.7 (0.0) 0.0% (57.2) (57.2) 0.0% (75.0) (75.0) 0.0% (132.2) (132.2) 0.0 0.0% 87.3 87.3 0.0% 83.2 83.2 0.0% 170.5 170.5 (0.0) 0.0% 2.5 16.2 (13.7) -84.6% | (4.0) (4.0) 0.0% (1.5) (1.5) 0.0 0.0% Unrealized G(L) on Equities Total Revenue 0.5 0.5 0.0% 0.1 0.1 0.0% 0.6 0.6 0.0 0.0% 90.3 104.0 (13.7) -13.2% 79.3 79.3 0.0% 169.6 169.6 0.0 0.0% Underlying Loss & LAE 17.0 19.7 (2.7) -13.7% 19.5 19.5 0.0% 36.5 36.5 (0.0) 0.0% Current year CAT Loss & LAE 2.6 2.6 0.0 0.0% 6.5 6.5 0.0% 9.2 9.2 0.0 0.0% Prior year development (F)/U (3.2) (3.2) 0.0% (5.2) (5.2) 0.0% (8.3) (8.3) - 0.0% Net Loss & LAE 16.4 19.1 (2.7) -14.1% | 20.9 20.9 0.0% 37.3 37.3 0.0 0.0% Operating expenses 37.9 42.4 (4.5) -10.6% | 35.4 35.4 0.0% 73.3 73.3 (0.0) 0.0% Interest Expense Total Expenses 2.7 2.7 0.0 0.0% 2.7 2.7 0.0% 5.4 5.4 0.0 0.0% 57.1 64.2 (7.1) -11.1% 59.0 59.0 0.0% 116.1 116.1 0.0 0.0% Other income Income before income taxes Provision for income taxes 0.6 0.6 - 0.0% 0.8 0.8 0.0% 1.4 1.4 0.0% 33.8 40.4 (6.6) -16.3% 21.1 21.1 - 0.0% 54.9 54.9 (0.0) 0.0% 3.5 9.9 (6.4) -64.6% 0.7 (1.5) 2.3 -153.3% 4.2 0.6 3.6 600.0% Net income from continuing operations per share Gain (loss) from discontinued operations per share Net income (loss) 30.4 30.6 $ (0.2) -0.7% $ 20.4 22.6 $ (2.3) -10.2% $ 50.7 $ 54.3 $ (3.6) -6.6% $ 0.70 $ 0.70 $ 0.0% $ 0.47 $ 0.52 $ $ 236.9 $ 230.3 $ 6.6 2.9% $ (2.6) $ (4.4) $ $ 5.44 $ 5.29 $ 0.15 2.8% $ (0.06) $ (0.10) $ (0.06) 1.8 0.04 -10.6% -40.9% -41.3% $ 1.16 $ 1.24 $ (0.08) -6.4% $ 234.3 $ 224.9 $ 9.5 4.2% $ 267.3 $ 260.9 $ 6.4 2.5% $ 17.8 $ per share $ 6.14 $ 5.99 $ 0.15 2.5% $ 0.41 $ 0.42 $ 18.2 $ (0.5) (0.01) $ 5.36 -2.7% $285.1 $ 5.15 $ 0.21 4.1% $ 279.1 $ 5.9 2.1% -3.3% $ 6.52 $ 6.39 $ 0.13 2.1% Core Income (Loss) per share SS $ 30.7 $ 30.9 $ $ 0.70 es es (0.2) -0.6% $ 26.2 $ 0.71 $ (0.01) -2.1% $ 0.60 $ es s $ 28.4 $ (2.3) 0.65 $ (0.05) -8.1% -7.9% $ 56.9 $ 1.30 $ $ 60.4 $ (3.6) 1.38 $(0.08) -6.0% -5.6% Net Loss Ratio 18.8% 21.9% -3.1 pts 25.1% 25.1% O pts Net Expense Ratio 43.4% 48.6% -5.1 pts 42.6% 42.6% 0 pts 21.9% 43.0% 21.9% O pts 43.0% O pts Combined Ratio 62.2% 70.5% -8.3 pts 67.7% 67.7% 0 pts 64.9% 64.9% 0 pts Less: Current year catastrophe loss & LAE 3.0% Less: Prior year reserve development (F)/U Underlying Combined Ratio -3.6% 62.9% 2.9% -3.6% 71.2% -8.3 pts 0.1 pts 7.9% 7.9% O pts 5.4% 5.4% O pts O pts -6.2% -6.2% O pts -4.9% -4.9% O pts 66.0% 66.0% O pts 64.4% 64.4% 0 pts ER = earnings release from August 10, 2023 American Coastal INSURANCE CORPORATION™ A 7#8Summary of Balance Sheet Changes $ in millions except per share amounts March 31, 2023 June 30, 2023 10-Q/A 10-Q Change 10-Q 8-K Change Cash, investments, and restricted cash $ 372.7 $ 372.7 $ | $ 241.7 $ 241.7 $ Accrued investment income 1.8 1.8 1.6 1.6 Property and equipment, net 4.7 18.1 (13.4) 4.5 4.5 Premiums receivable 48.1 48.1 55.7 55.7 Reinsurance recoverable 792.4 792.4 658.8 658.8 Ceded unearned premiums 65.7 65.7 329.7 329.7 Goodwill 59.5 59.5 59.5 59.5 Deferred policy acquisition costs, net 59.9 59.9 34.8 34.8 Intangible assets, net 11.8 11.8 10.9 10.9 Other assets 17.4 15.4 2.0 35.5 33.5 2.0 Assets held for disposal 13.4 13.4 12.1 12.1 Total Assets $ 1,447.4 $ 1,445.4 $ 2.0 $ 1,444.8 $ 1,442.8 $ 2.0 Unpaid loss & loss adjustment expenses $ 748.4 $ 748.4 $ $ 534.7 $ 534.7 $ Unearned premiums 301.6 301.6 387.3 387.3 Reinsurance payable 33.9 33.9 140.7 140.7 Payments outstanding 2.3 2.3 17.5 17.5 Accounts payable and accrued expenses 89.6 89.6 93.2 93.2 Operating lease liability 1.4 1.4 1.2 1.2 Other liabilities 30.1 36.2 (6.2) 7.6 11.5 (3.9) Notes payable, net 148.4 148.4 148.5 Liabilities held for disposal 1.8 1.8 1.8 148.5 1.8 Total Liabilities $ 1,357.5 $ 1,361.9 $ (4.4) $ 1,332.5 $1,336.3 $ (3.9) Total Stockholders' Equity $ 89.8 $ 83.5 $ 6.3 $ 112.4 $ 106.5 $ 5.9 Total Liabilities and Stockholders' Equity $ 1,447.4 $ 1,445.4 $ 2.0 $ 1,444.8 $ 1,442.8 $ 2.0 Book value per share $ 2.08 $ 1.93 $ 0.15 $ 2.59 $ 2.45 $ 0.14 A American Coastal INSURANCE CORPORATION™ 8#92023-24 Core Catastrophe Reinsurance - AmCoastal $970.3M UPC Re's participation could increase our retention from $10m to $12.3m if Layer 1 is exhausted. FHCF 90% of $665.2m xs $305.1m NIL 10% Co-Participation $305.1M FORA Layer 1: $33.6M xs $271.4m; Nil FORA Layer 2: $33.6M xs $237.8m; Nil ■ Covered Perils: HU and EQ Only $385m $380m Layer 6: 100% $5m xs $380m; Nil Layer 5: 100% $5m xs $375m; Nil ■ Covered Territory: Florida Only $375m $250m Layer 4: 60.0% $125m xs $250m Nil Berkshire 20% QS Arch Re 20% QS Layer 3B: 60.0% $125m xs $125m Berkshire 20% QS Arch Re 20% QS 1 Reinstatement FORA Layer 3: $19.8M xs $218m; Nil $125m $218.0M Layer 3A: 60.0% $25m xs $100m 1 Reinstatement $100m ■ 1st and 2nd Event Retention: $6 million plus $4m Co-Participation on Layer 1 ■ Purchased approx. $1.1B of occurrence-based limit which protects the company to the 167yr return time (AIR LTWDS). The program provides $1.3B of aggregate limit. ■ 95% of reinstatable limit is pre-paid ■ Total net reinstatement exposure is $5.1m ■ Private market occurrence limit purchased of $371m ■ FHCF placed at 90% of $665.2m xs $305.1m ■ FORA placed at 100% of $87.1m xs $218m ■ 40% Strategic Gross Quota Share ■ 20% with Arch and 20% with Berkshire ■ Quota Shares provide ground-up CAT limit ($175m of CAT Occurrence Limit) Private XOL Berkshire QS Arch QS Layer 2: 52.3% $65m xs $35m 1 Reinstatement Berkshire 27.7% QS Arch Re 20% QS FHCF FORA $35m Layer 1: 64.0% $25m xs $10m 1 Reinstatement $4m Co-Par Arch Re 20% QS $10m Retention: $6m Berkshire 20% QS Arch Re 20% QS FHCF & FORA Inures ■ Internal participation with UPC Re on Layer 1 (9%) American Coastal INSURANCE CORPORATION™ ☐ $675k capital required with 100% expected return ■ Included some AOP CAT coverage as well A#102023-24 Catastrophe Reinsurance - IIC IIC maintained its $3m occurrence retention and UPC Re did not participate on IIC's program. $85.0M $35.0M $10.0M $3.0M Layer 3: $50M xs $35M Nil Layer 2: $25M xs $10M 1@100% Layer 1: $7M xs $3M 1@100% $3.0M Retention Covered Perils: All Perils Covered Territory: New York only Retention: $3 million Program provides $82.0M of private market occurrence-based limit which protects the Company to the 140.8yr return time (AIR LTWDS) Non-Cascading static layers with reinstatements on Layers 1 & 2 Reinstatements are 1@100 on Layers 1 & 2 $32m of reinstatable limit Reinstatement premium protection was purchased on Layers 1 & 2 American Coastal INSURANCE CORPORATION™ A 10#11Cautionary Statements This presentation contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These forward looking statements include expectations regarding our diversification, growth opportunities, retention rates, liquidity, investment returns and our ability to meet our investment objectives and to manage and mitigate market risk with respect to our investments. These statements are based on current expectations, estimates and projections about the industry and market in which we operate, and management's beliefs and assumptions. Without limiting the generality of the foregoing, words such as "may," "will," "expect," "endeavor," "project," "believe," "anticipate," "intend," "could," "would," "estimate," or "continue" or the negative variations thereof, or comparable terminology, are intended to identify forward-looking statements. Forward-looking statements are not guarantees of future performance and involve certain known and unknown risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements. The risks and uncertainties include, without limitation: the regulatory, economic and weather conditions in the states in which we operate; the impact of new federal or state regulations that affect the property and casualty insurance market; the cost, variability and availability of reinsurance; assessments charged by various governmental agencies; pricing competition and other initiatives by competitors; our ability to attract and retain the services of senior management; the outcome of litigation pending against us, including the terms of any settlements; dependence on investment income and the composition of our investment portfolio and related market risks; our exposure to catastrophic events and severe weather conditions; downgrades in our financial strength ratings; risks and uncertainties relating to our acquisitions including our ability to successfully integrate the acquired companies; and other risks and uncertainties described in the section entitled "Risk Factors" and elsewhere in our filings with the Securities and Exchange Commission (the "SEC"), including our Annual Report in Form 10-K for the year ended December 31, 2021 and 2022 and our Form 10-Q for the periods ending March 31, 2022, June 30, 2022, September 30, 2022, March 31, 2023, and June 30, 2023 including amendments. We caution you not to place undue reliance on these forward looking statements, which are valid only as of the date they were made. Except as may be required by applicable law, we undertake no obligation to update or revise any forward-looking statements to reflect new information, the occurrence of unanticipated events, or otherwise. This presentation contains certain non-GAAP financial measures. See our earnings release, Form 10-K, and Form 10-Q for further information regarding these non-GAAP financial measures. American Coastal INSURANCE CORPORATION™ A 11