ProSomnus SPAC Presentation Deck

Transaction Summary(¹)(2) OVERVIEW ▪ ProSomnus is being acquired by Lakeshore Acquisition I (“LAAA"), a publicly listed special purpose acquisition company with $55M cash in trust ■ Consideration for ProSomnus includes 11.2M shares of LAAA common stock - ProSomnus shareholders are eligible to receive 3M additional common shares (the "earn-out shares") of the combined company across 3 different tranches if the stock trades at or above $12.50, $15.00 and $17.50 ▪ LAAA has signed a term sheet whereby $15M of Senior Secured Convertible Notes and $15M of non-binding Junior Secured Convertible Notes are expected to fund into LAAA at close of merger(³) ▪ Pro forma market cap of $199M and enterprise value of $168M ▪ Pro forma net cash of $64M after estimated fees and expenses 6% 1. 2% 5% 32% 56% PRO FORMA OWNERSHIP Existing ProSomnus Shareholders Existing Lakeshore Shareholders (4) Lakeshore Sponsor Fees & Expenses (in stock) Lenders (5) Total Uses Excludes 4.1M public warrants and 0.2M sponsor warrants at an $11.50 strike price as well as the impact of any potential earn-out shares 2. Assumes no redemptions from LAAA trust 3. Funding is subject to signing the definitive convertible debt agreements 4. Includes up to 810k Additional Shares, comprised of up to 410k Sponsor promote shares, to be matched by up to 410k of newly issued Company shares to incentivize non-redeemers or equity PIPE investors 5. 6. 56% 32% 6% 5% 2% 100% PRO FORMA VALUATION SUMMARY in millions (except per share data) Shares Outstanding Assumed Price Per Share Market Capitalization Plus: Debt Less: Cash Enterprise Value EV / 2022E Revenue (6) EV / 2023E Revenue (6) SOURCES Cash Remaining in Lakeshore Trust ProSomnus Equity Roll Convertible Debt Proceeds Total Sources USES PROSOMNUS SLEEP TECHNOLOGIES ProSomnus Equity Roll Debt Paydown Fees & Expenses (Estimated) Cash to Balance Sheet Total Uses Select lenders will receive up to 300k additional shares, subject to signing the definitive convertible debt agreements; does not reflect potential future issuances of shares upon conversion of convertible debt, which could be substantially dilutive Assumes midpoint of revenue range 19.9 $10.00 $199 $34 $65 $168 8.2x 4.3x $55 $112 $30 $196 $112 $13 $7 $64 $196 23 STRICTLY CONFIDENTIAL

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