Contract analysis

I. Executive Summary On March 15, 2024, IRS Appeals Officer Noreen Castañeda issued a formal settlement offer to resolve the Internal Revenue Service's proposed transfer pricing adjustments for tax years 2017 through 2020, arising from the examination of Penterra Pharmaceuticals Corp. ("PPC" or the "Company"). The settlement offer follows the in-person Appeals conference held on February 28, 2024, at the IRS Appeals

II. Background: The IRS Examination and Proposed Adjustments A. Examination History The IRS Large Business & International Division ("LB&I") opened an examination of PPC on May 16, 2022, as evidenced by Letter 2205-A (Notification of Examination). The examination was assigned Exam Team ID LB&I-NE-TP-2022-00641 and covered PPC's federal income tax returns (Forms 1120) for the following tax years: • Tax Year 2017 • Tax

1. CSA Cost-Sharing Ratio Adjustment. The IRS proposed increasing PBI's cost-sharing percentage under the CSA by 8 to 12 percentage points per year for each of the four tax years under examination. The IRS's position was that PPC's reasonably anticipated benefit ("RAB") projections, which were used to determine the cost-sharing ratios under the CSA, systematically understated the value attributable to U.S.-source con

2. Legacy IP Royalty Rate Adjustment. The IRS proposed increasing the royalty rate applicable to PBI's use of pre-CSA intellectual property from the contractual rate of 4.5% of net sales to 11.0% of net sales. The IRS based this proposed increase on its own selection of comparable uncontrolled transactions ("CUTs"), which the IRS contended demonstrated that the arm's-length royalty rate for the licensed pharmaceutica

3. Platform Contribution Transaction ("PCT") Undervaluation. Although the PCT payment was made in connection with the formation of the CSA in 2012 — a year outside the examination period — the IRS used its own valuation of the PCT as a basis for supporting its adjustments to income in the 2017–2020 tax years. Specifically, the IRS valued the PCT at $852 million, compared to PPC's original PCT valuation of $312 millio

4. Economic Substance Challenge. The IRS asserted that PBI lacked sufficient economic substance to be respected as the beneficial owner of the intangible property and commercial rights at issue, and that key Development, Enhancement, Maintenance, Protection, and Exploitation ("DEMPE") functions remained in the United States. If sustained, this position would have had the effect of recharacterizing substantial portion

III. Terms of the Settlement Offer The following sets forth the material terms of the settlement offer communicated by Appeals Officer Castañeda on March 15, 2024. The offer was conveyed orally to Leonard Cross and Garrett Simmons and confirmed in a written settlement memorandum transmitted by facsimile to Calderwood & Harkness on the same date. A. Total Adjustment Amount The settlement proposes a total income adjust

IV. Financial Impact Analysis This section quantifies the financial impact of the proposed settlement on PPC, including federal tax liability, interest, total cash cost, professional fees, and a comparison to the full proposed adjustment. A. Federal Tax Liability The federal income tax liability arising from the settlement is computed as follows: Settlement income adjustment: $47,600,000 Applicable corporate tax rate

V. Impact on FIN 48 / ASC 740-10 Uncertain Tax Position Reserves The settlement will have a material and favorable impact on PPC's financial statements, specifically with respect to its uncertain tax position reserves maintained under ASC 740-10 (formerly FIN 48). PPC's pre-settlement FIN 48 reserve for uncertain tax positions related to the Irish IP structure (encompassing both the CSA and legacy royalty arrangement

VI. Impact on Hargrove National Bank Credit Facility Covenants PPC's $1.5 billion revolving credit facility with Hargrove National Bank, N.A. (Christine Bellucci, SVP, Relationship Manager) contains covenants that are relevant to the resolution of the IRS examination. Specifically, the credit agreement includes tax-indemnity provisions and material-tax-event covenants that impose reporting obligations and, in certain

VII. SEC Disclosure Considerations The settlement of the IRS examination has implications for PPC's disclosure obligations under the federal securities laws. PPC is a publicly traded company whose shares are listed on the New York Stock Exchange, and PPC is therefore subject to the periodic reporting requirements of the Securities Exchange Act of 1934, including the filing of annual reports on Form 10-K and quarterly

VIII. Analysis of Settlement Terms in Light of Hazards of Litigation This section provides Calderwood & Harkness's assessment of the settlement terms in light of the hazards of litigation — i.e., the risks and uncertainties that PPC would face if it rejected the settlement offer and proceeded to litigation in the United States Tax Court. Appeals Officer Castañeda's settlement offer represents her independent assessme

IX. Penalty Abatement Analysis The full abatement of the proposed IRC § 6662(e) substantial valuation misstatement penalty represents a significant and independently valuable component of the settlement outcome. The proposed penalty of $15,977,000 would have been assessed at the 20% rate on any tax attributable to a net IRC § 482 transfer pricing adjustment, regardless of the ultimate settlement amount of the underly

X. Potential Irish Tax Implications The settlement of the U.S. examination raises potential Irish tax implications that require coordination with PPC's Irish tax counsel, Thornbury & Keogh (Ciarán Thornbury, Lead Partner). The $47,600,000 U.S. income adjustment has the potential to create a corresponding adjustment on PBI's Irish tax return. Under the U.S.-Ireland Income Tax Treaty, Article 9 (Associated Enterprises)

XI. State Tax Implications The $47,600,000 federal income adjustment resulting from the settlement will flow through to PPC's state income tax returns in PPC's filing jurisdictions. PPC files income tax returns in multiple states, including its state of incorporation and principal place of business, New Jersey, as well as other states in which PPC has nexus. The state-level additional tax exposure resulting from the

XII. Recommendation A. Acceptance of Settlement Offer Based on the comprehensive analysis set forth in this memorandum, Calderwood & Harkness recommends that PPC accept the settlement offer of $47,600,000 in total income adjustments for Tax Years 2017 through 2020, together with full abatement of the proposed IRC § 6662(e) penalty. The key factors supporting this recommendation are as follows:

1. Favorable Economics. The total estimated cash cost to PPC of approximately $12,840,000 (tax plus estimated interest) compares extremely favorably to the potential exposure of $95,861,000 or more (tax plus penalty on the full proposed adjustment, before interest). The settlement represents approximately 86.6% savings on a tax-plus-penalty basis, and approximately 89.6% savings when the penalty abatement is separate

2. Full Penalty Abatement. The settlement eliminates the $15,977,000 proposed IRC § 6662(e) penalty in its entirety, as well as the reserved IRC § 6662(h) gross valuation misstatement penalty. This outcome provides complete certainty that no penalty exposure exists for the 2017–2020 examination period.

3. Certainty. Acceptance of the settlement eliminates the risk, cost, and management distraction of Tax Court litigation, which would be expected to span two to four years and involve substantial additional professional fees. Certainty of outcome has independent value, particularly for a publicly traded company with ongoing SEC disclosure obligations and investor relations considerations.

4. Within Target Range. The settlement amount of $47,600,000 (12.51% of proposed adjustments) falls squarely within Calderwood & Harkness's recommended target range of 10–15%, and well below the 20% hard ceiling authorized by PPC management. The result validates the negotiation strategy employed throughout the Appeals process.

5. Favorable FIN 48 Impact. The settlement enables PPC to reduce its ASC 740-10 uncertain tax position reserve from $62,400,000 to approximately $14,800,000 — a reserve release that will benefit PPC's effective tax rate and improve the Company's reported financial results in Q1 2024.

6. Credit Facility Compliance. The settlement does not trigger material-tax-event covenants under PPC's $1.5 billion revolving credit facility with Hargrove National Bank, N.A., eliminating any risk of default or covenant-compliance issues associated with the examination resolution.

7. Preserves PCT Position. The settlement does not require PPC to concede on the $312 million PCT valuation, which remains intact and unchallenged. This is critically important because any concession on the PCT valuation would have had cascading implications for PPC's transfer pricing architecture in subsequent tax years, potentially increasing exposure in future examination cycles. B. Risks of Rejection If PPC were