CoastalSouth Bancshares (COSO) - Due Diligence

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64OpportunityDD: Jun 02, 2026Analyst: 71

paidPrice at analysis date

USD 25.7 (02/06/2026)

domainMkt cap

$3793.81M

pie_chartShares

12.0M

candlestick_chart52W

$19.24-$26.36

trending_downShort interest

1.9%

INFONYSEFinancials370 employeesFounded 2004

Verdict: SOLID — Fairly priced

Small Southeast community bank, recent IPO (Aug 2025), trading at P/E 11.9x and P/TBV 1.21x — both below peer median. Q1 2026 EPS missed consensus by ~6% but core franchise growing (deposits +6%, loans +11% YoY). $15M buyback authorized covers ~5% of float. Limited absolute upside (~5–10%) but downside well anchored by tangible book.

📊 DIANALITICS RESEARCH INDEXCompany & Thesis Assessment Score /100 — updated 2026-06-02

CoastalSouth Bancshares (COSO)

Regional bank — Southeast US · NYSE · Hilton Head Island, SC

"Clean balance sheet, growing deposits, modest profitability — solid but limited upside"

P/E 11.9x P/TBV 1.21x Buyback $15M Q1 EPS miss −5.6% Deposits +6%

Fin. strength

/20 pts

EBITDA/FCF

/15 pts

Debt/leverage

/15 pts

Stage/business

/15 pts

Catalysts

/10 pts

Reg. risk

/8 pts

Risk/reward

/7 pts

Management

/5 pts

Sector/macro

/3 pts

Compliance

/2 pts

💡 Fair Value Estimate — Blended P/E + P/TBV (community bank framework)

Fair value base case

USD 27.0

Range: USD 22.0-USD 32.0

Price at analysis date: USD 25.7 (02/06/2026)

Base upside/downside: +5%

Methodology: Community bank framework. Earnings anchor uses Q1 2026 EPS $0.51 annualized ($2.04) + modest growth, capped at $2.10 conservatively given the Q1 miss. TBV anchor uses YE25 actual $21.25 + retained earnings net of $0.20 annual dividend + buyback effect. Peer set: SMBK (closest comp by NIM/ROAE), UBSI (Mid-Atlantic regional), CBU (premium multiple reference). Sanity check: Stephens FY26E ROATCE 11.0% × $21.25 TBV = $2.34 normalized EPS × 12x = $28.10 (consistent with our base case). ⚠️ Not investment advice.

Component	Assumption	USD/share
Earnings-power anchor	12.0x peer median P/E × FY26E EPS $2.10 (Q1 annualized $2.04 + modest growth)	+$25.20
TBV uplift	(YE26E TBV $22.75 − $21.25 base) × 1.25x peer median P/TBV	+$1.88
Buyback accretion	$15M / ~$26 avg / 12.0M shares = ~5% buyback × 12.0x P/E	+$0.95
Excess capital uplift	Post-IPO surplus capital, ~+$0.50/sh deployment optionality	+$0.50
Micro-cap liquidity discount	~$310M mkt cap, 12M float, modest institutional coverage	−$1.53
FV base case	Reconciliation: $25.20 + $1.88 + $0.95 + $0.50 − $1.53 = $27.00	≈ $27.00

Bull

$30–$33

Probability: 20%

NIM expands to 3.7%+ as Fed cuts deposit costs faster than asset yields; ROATCE reaches 11–12%; multiple expands to 1.4x P/TBV in line with SMBK; M&A premium possible.

Base

$26–$29

Probability: 55%

Normal execution: TBV grows to ~$22.75 by YE26, FY26 EPS ~$2.10, multiple re-rates modestly toward 1.25x P/TBV as buyback supports float. Total return ~+5–10% + ~0.8% dividend.

Bear

$19–$23

Probability: 25%

Southeast CRE stress materializes (hotel/coastal Florida/SC); NIM compresses below 3.4%; loan-loss provisions accelerate; multiple drops to 0.95x P/TBV ($20). Q1 miss extends into FY.

Methodology: Methodology: Community bank framework. Earnings anchor uses Q1 2026 EPS $0.51 annualized ($2.04) + modest growth, capped at $2.10 conservatively given the Q1 miss. TBV anchor uses YE25 actual $21.25 + retained earnings net of $0.20 annual dividend + buyback effect. Peer set: SMBK (closest comp by NIM/ROAE), UBSI (Mid-Atlantic regional), CBU (premium multiple reference). Sanity check: Stephens FY26E ROATCE 11.0% × $21.25 TBV = $2.34 normalized EPS × 12x = $28.10 (consistent with our base case). ⚠️ Not investment advice. Not investment advice.

⚠️ Methodology note: Community bank valuation. We blend earnings-power approach (FY26E EPS × peer median P/E) and tangible-book approach (TBV × peer median P/TBV) rather than DCF, given the regulated bank profile and limited operating leverage at this scale. Floor is anchored by tangible book value per share ($21.25 at YE2025).

📊 Capital Structure · Short Interest · Buyback & Dilution

🟢 Short Interest

1.9%

192,916 shares short as of Mar 31, 2026 (vs 79,795 Mar 15 — small absolute increase). Days to cover low. No squeeze setup; signals modest skepticism, not a thesis.

🟡 Share Dilution (1Y)

+~30%

From ~9.2M (pre-IPO) to ~12.0M post-IPO (Aug 2025, ~$80M raise). One-off event — recurring dilution from now on minimal (~1% SBC).

🟢 Buyback

$15M

Authorized May 2026 (active through Apr 2027). Covers ~5% of float at current price. CFO Anthony Valduga sold $118K on 2026-05-06 (routine, immaterial).

Short Interest — context

COSO — 1.9%

1.9%

Very low SI — no short thesis in market, no squeeze setup. The story is "small cheap community bank with growing deposits and a fresh buyback", not a hated stock. Buyback execution at current levels is accretive to TBV/share and EPS.

$Financial analysis — FY 2024–2026E

FY25 Net Income

$24.9M

EPS $2.16 diluted

Q1 2026 NIM

3.59%

Stable / slightly up YoY

Q1 2026 ROA / ROATCE

1.10% / 9.9%

Modest, sub peer median

TBV per share (YE25)

$21.25

Hard floor; growing ~7%/yr

Item	FY 2023	FY 2024	FY 2025	FY 2026E	Note
Net interest income ($M)	~$58	~$66	~$74	~$83	NII +12% expected on loan growth
Net income ($M)	~$13	~$18	$24.9	~$25–26	Q1 miss caps growth
EPS diluted ($)	~$1.40	~$1.95	$2.16	~$2.10	Share count up post-IPO Aug 2025
Loans HFI ($B)	~$1.35	~$1.46	~$1.46	~$1.75	+$166M Q1 alone
Total deposits ($B)	~$1.75	~$1.90	~$1.99	~$2.15	Core +$117.9M Q1 / brokered −$48M
TBV per share ($)	~$17.50	~$19.50	$21.25	~$22.75	Retained earnings + buyback

FY 2023-24 numbers approximated from S-1/registration history (IPO Aug 2025). FY 2026E from Stephens model ($30 PT, ROATCE 11%) and our normalization. Source: 8-K Q1 2026, S-1, Stephens research.

Quarterly dynamics — last 5 quarters
Metric	Q1 2025	Q2 2025	Q3 2025	Q4 2025	Q1 2026
Net Interest Income ($M)	16.8	17.5	19.0	20.4	19.7
Net Income ($M)	4.6	5.4	7.0	7.9	6.3
Diluted EPS ($)	0.50	0.58	0.61	0.61	0.51
NIM (%)	3.45	3.50	3.55	3.62	3.59
ROATCE (%)	9.5	10.4	11.1	11.2	9.9

Q1 2026 = sequential profitability dip (ROATCE 11.2% → 9.9%, EPS $0.61 → $0.51). Driven by seasonal expense uptick + slight provision build. Miss is real but reversible. Q2 2026 earnings expected 2026-07-27.

Financial position and sustainability

Loan-to-deposit ratio

~79%

CET1 (estimated)

~13.0%

Allowance / loans (ACL%)

~1.10%

NPA / loans

~0.45%

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Business model — Southeast community bank, post-IPO

A small commercial-focused franchise in coastal Southeast US

CoastalSouth Bancshares is the holding company of Coastal States Bank, a commercial bank founded in 2004 and headquartered in Hilton Head Island, South Carolina. The bank operates ~14 branches across coastal SC, GA and FL, serving mid-market businesses, professional clients and high-net-worth individuals. Loan book is ~$1.6B (CRE-tilted, with some C&I and residential mortgage), funded by ~$2.0B of deposits (76% core, 24% time/brokered, with active reduction of brokered CDs). IPO'd on NYSE in August 2025 raising ~$80M to fund organic loan growth and balance-sheet expansion. Niche: relationship-driven commercial lending in growing Southeast coastal markets (Bluffton-Hilton Head, Savannah-coastal GA, Jacksonville). Recent additions: new commercial bankers expanding the franchise into adjacent metros.

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Legal, regulatory and risk analysis

CRE concentration (coastal SC/GA/FL)

Moderate

Loan book is CRE-tilted in coastal Southeast — hospitality, retail, multifamily. Hurricane-prone geography adds insurance/credit overlay risk. Office exposure modest but worth monitoring as cycle progresses.

NIM compression risk if Fed cuts deeply

Moderate

If Fed cuts >75bps in next 12 months, asset yields reprice faster than deposit costs at small community banks. NIM could compress 15–25bps. Partly offset by ~$48M brokered CD reduction reducing high-cost funding.

Micro-cap liquidity / float overhang

Moderate

~$310M market cap, 12.0M shares, modest daily volume (~30-50k shares). IPO lockups likely expired Feb–Aug 2026; insider selling could pressure stock. CFO sold $118K May 6 — small but worth tracking.

Q1 2026 EPS miss — execution signal

Moderate

EPS $0.51 vs $0.54 consensus (−5.6%); revenue $21.7M vs $22.06M (−1.6%). First miss as public company. Need Q2/Q3 to confirm whether seasonal or structural; markets penalize repeated misses harshly at micro-cap scale.

Tangible book value as hard floor

Positive

TBV/share $21.25 (YE25), growing ~7% annually. Provides downside anchor at ~0.95x P/TBV ≈ $20.20. Bank profile = floor exists, unlike pre-revenue stories. Limits realistic downside to ~−20% in adverse scenario.

$15M buyback active

Positive

$15M / ~$310M cap = ~5% of float, executable May 2026 – Apr 2027. At $25.70 (below $27 base FV), buyback is accretive to both EPS and TBV/share. Signals capital deployment discipline post-IPO.

Clean compliance, no litigation

Positive

No class actions, no SEC investigations, no short-seller reports identified. Insider activity essentially neutral (1 small CFO sale, no buying). Clean governance is table-stakes but not a positive thesis — confirms absence of red flags.

Small scale limits operating leverage

Moderate

$2.3B total assets is sub-scale for sustained ROATCE >12%. Tech/compliance spend is fixed; cost-to-income ratio likely stays ~60%+. Either inorganic scaling (M&A target/acquirer) or modest profitability ceiling. Limits multiple expansion above ~1.4x P/TBV.

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SWOT analysis

Strengths

+Trading below peer median on both P/E (11.9x vs ~12.5x) and P/TBV (1.21x vs ~1.45x)
+Tangible book value $21.25 provides hard downside floor (~0.95x = $20)
+Core deposit growth +$117.9M Q1 with reduction in brokered CDs (cleaner funding mix)
+$15M buyback active and accretive at current price
+Clean governance, no litigation, low short interest (1.9%)

Weaknesses

−Q1 2026 EPS miss (−5.6%) and revenue miss (−1.6%) — first as a public company
−ROATCE 9.9% in Q1 — below 11% Stephens FY26 forecast
−Sub-scale ($2.3B assets) limits operating leverage; cost-to-income ~60%+
−Micro-cap liquidity (~30-50k daily volume) caps institutional ownership
−Modest analyst coverage (~8 analysts) and limited trading history post-IPO Aug 2025

Opportunities

→Multiple re-rating to peer median P/TBV (1.45x) implies $30+ ($21.25 × 1.45)
→Southeast coastal markets enjoying secular population/business migration
→Stephens $30 PT and consensus $29.07 = ~+13–17% upside if execution normalizes
→Potential M&A target for larger SE regional ($5–15B asset bucket) at TBV premium
→Fed rate cuts could expand NIM if deposit costs fall faster than asset yields

Threats

!Southeast CRE / hospitality downturn (hurricane risk + cycle)
!Regional bank deposit-flight risk if 2023-style stress recurs
!Repeated EPS misses would cause multiple compression (community banks unforgiving)
!Lockup-related insider selling overhang into late 2026
!Sub-scale franchise — peers consolidating could leave COSO without a seat at the table

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Summary by assessment area

🟢 Financial risk — LOW

Clean balance sheet, CET1 ~13%, TBV growing
$15M buyback authorized + 0.8% dividend yield
No going-concern issue; profitable + growing

🟡 Execution risk — MODERATE

First public-company quarter was a miss (−5.6% EPS)
Need Q2/Q3 to confirm Stephens FY26 ROATCE 11% trajectory
Sub-scale limits structural profitability ceiling

🔵 Valuation — FAIR / SLIGHTLY CHEAP

Base FV $27.00 vs price $25.70 (+5% upside)
Consensus $29.07, Stephens $30 — more bullish than us
Floor at ~$20 (0.95x TBV); R/R asymmetric to upside

2026-07-27 earnings

Q2 2026 Earnings Release

short-term Impact: High Direction: Binary

Critical test after Q1 EPS miss. Beat would reset narrative and validate Stephens FY26 ROATCE 11% trajectory; second miss in a row would trigger meaningful multiple compression at micro-cap scale.

2026-08-15 capital_markets

$15M Buyback Execution Reporting

short-term Impact: Medium Direction: Bullish

First 10-Q reporting buyback activity under the May 2026 authorization. Aggressive purchases below $26 (sub-FV) signal management conviction; modest pace suggests preserving capital for organic growth or M&A.

2026-10-27 earnings

Q3 2026 Earnings Release

medium-term Impact: High Direction: Binary

Confirms whether Q1 miss was seasonal/transitory or signals structural pressure. Key watch: NIM trajectory post-Fed cuts, deposit cost behavior, loan loss provision trend.

2026-09-17 macro

FOMC September Meeting — rate path

medium-term Impact: High Direction: Neutral

Rate path direct driver of NIM. 25bps cut likely neutral-to-positive (deposit costs fall first); 75bps+ cumulative cuts by YE26 would compress NIM and hurt EPS. Sector-wide event but community banks more exposed.

2026-08-31 capital_markets

Insider lock-up expiration window

short-term Impact: Medium Direction: Bearish

IPO Aug 2025 → 180-day lock-up expired Feb 2026; secondary lockup (12-month) potentially expires Aug 2026. Watch Form 4 filings for material insider disposals that could pressure float. CFO already sold modestly in May.

2026-07-17 capital_markets

Q3 dividend declaration

short-term Impact: Low Direction: Bullish

Q1 dividend $0.05/share; modest raise (e.g., $0.07) would signal management confidence post-Q1 miss. Current annualized yield ~0.8%; payout ratio ~10% (room to grow without strain).

2026-12-31 strategic

M&A optionality — SE bank consolidation

long-term Impact: High Direction: Bullish

$2.3B asset community banks in SE growth corridor are typical bolt-on targets for $10–25B regionals. Tangible book premium in recent SE deals 1.4–1.7x → potential $30–36 takeout. Low base-case probability but not zero.

Sources & Disclaimer

Sources: COSO Q1 2026 8-K (2026-04-20), 10-Q (filed 2026), 2025 Annual Report, S-1 registration (Aug 2025 IPO), Stephens research (2026-04-22 $30 PT), MarketBeat short interest update (2026-04-12), DailyPolitical Form 4 disclosure (CFO sale 2026-05-06), StockTitan filings index. Market data — last verified close 2026-06-01 (T-1 trading day): COSO $25.70 (Yahoo Finance previous close, cross-checked with Robinhood $25.53 close May 29 range). Market cap ~$310M, 52W: $19.24–$26.36, ~12.0M shares outstanding, short interest 1.9%, days to cover low. P/E TTM 11.9x, P/TBV 1.21x. Quarterly dividend $0.05/sh ($0.20 annualized, ~0.8% yield). Peer comparables P/E and P/TBV from public filings and stockanalysis.com (SMBK, UBSI, CBU). ⚠️ This document is for informational purposes only and does not constitute financial or investment advice.