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Prothena Corp Public cash flow, quarter by quarter

Latest: Q3 2026 · from the cash-flow statements filed with the SEC

Free cash flow−$12.0M in Q3 2026 · −$31.4M over twelve months

Operating cash flow−$12.0M
Free cash flow−$12.0M

Analysis

In Q3 2026, Prothena Corp Public generated −$12.0M of operating cash flow. That is $28.6M more than in Q3 2025 (−$40.6M).

Over the twelve months to Sep 30, 2026, operating cash flow was −$31.4M; the largest uses were operating cash flow ($31.4M), other financing ($27.3M), other investing ($725K); the cash balance fell by $59.5M.

Operating cash flow was −$12.0M against net income of −$16.5M. The largest differences: stock-based pay +$6.4M, payables −$3.3M, prepaid and other assets +$1.7M.

Free cash flow

Prothena Corp Public: free cash flow by quarterProthena Corp Public: free cash flow by quarter−$47.8MQ4 2024−$53.4MQ1 2025−$46.3MQ2 2025−$40.6MQ3 2025−$23.3MQ4 2025$28.9MQ1 2026−$25.0MQ2 2026−$12.0MQ3 2026
Operating cash flow less capital spending.
Prothena Corp Public: operating cash flow against capital spendingProthena Corp Public: operating cash flow against capital spendingOperating cash flowCapital spending−$47.8M$0Q4 2024−$53.4M$0Q1 2025−$46.3M$0Q2 2025−$40.6M$0Q3 2025−$23.3M$0Q4 2025$28.9M$0Q1 2026−$25.0M$0Q2 2026−$12.0M$0Q3 2026
Latest (Q3 2026): Operating cash flow −$12.0M, Capital spending $0.

Capital allocation, year by year

Prothena Corp Public: where the cash came from (up) and went (down), by fiscal yearProthena Corp Public: where the cash came from (up) and went (down), by fiscal yearOperating cash flowShares issuedAsset salesFY2021: Operating cash flow $92.6MFY2021: Shares issued $93.6M$186MFY2021FY2022: Operating cash flow −$109MFY2022: Shares issued $17.8M$17.8MFY2022FY2023: Operating cash flow −$134MFY2023: Shares issued $21.5MFY2023: Asset sales $37K$21.6MFY2023FY2024: Operating cash flow −$150MFY2024: Shares issued $1.9M$1.9MFY2024FY2025: Operating cash flow −$164MFY2025
Over these 5 years operating cash flow totalled −$464M; the largest uses were operating cash flow ($556M). Cash-flow statements as filed.

Cash runway and the debt wall

Cash & investments$271M
Debtnone
Net cash$271M
Cash runway8.6 years

Prothena Corp Public is burning cash: its operations consume cash, a free cash flow of −$31.4M a year at the current rate against $271M of cash and investments: a runway of about 8.6 years before any new financing.

Where the cash came from and went

Prothena Corp Public: sources (+) and uses (−) of cash, Q3 2026Prothena Corp Public: sources (+) and uses (−) of cash, Q3 2026Cash drawn (+) / kept (−)$16.8MOperating cash flow−$12.0MBuybacks−$4.3MOther financing−$460KOther investing−$73K
Prothena Corp Public: sources (+) and uses (−) of cash, TTM to Q3 2026Prothena Corp Public: sources (+) and uses (−) of cash, TTM to Q3 2026Cash drawn (+) / kept (−)$59.5MOperating cash flow−$31.4MOther financing−$27.3MOther investing−$725K

From profit to cash

Prothena Corp Public: net income to operating cash flow, Q3 2026Prothena Corp Public: net income to operating cash flow, Q3 2026Net income−$16.5MDepreciation & amortization$209KStock-based pay$6.4MPayables−$3.3MDeferred revenue−$620KPrepaid and other assets$1.7MOperating cash flow−$12.0M
Non-cash charges are added back; money tied up in receivables or inventory is subtracted.

Every quarter

QuarterOperating cash flowBuybacksShares issuedCash drawn (+) / kept (−)Free cash flow
Q3 2026−$12.0M−$4.3M—$16.8M−$12.0M
Q2 2026−$25.0M−$15.6M—$41.3M−$25.0M
Q1 2026$28.9M−$6.9M—−$21.9M$28.9M
Q4 2025−$23.3M——$23.3M−$23.3M
Q3 2025−$40.6M——$40.6M−$40.6M
Q2 2025−$46.3M——$46.5M−$46.3M
Q1 2025−$53.4M——$53.5M−$53.4M
Q4 2024−$47.8M—−$1K$47.9M−$47.8M

Prothena Corp Public: income statement and cash flow

Prothena Corp Public, Q3 2026: revenue $620K (-74% year over year). The chart follows the revenue to costs, profit and cash.

Prothena Corp Public: every quarter, Q/Q and Y/Y → Open in the app

Read automatically from the company’s XBRL cash-flow statements; quarterly figures for the fourth quarter are the year less the first three. Errors are possible. Not investment advice.