Spero Therapeutics, Inc.

SPRO Healthcare Biotechnology

Spero Therapeutics, Inc.’s revenue for fiscal 2025 (year ended December 2025) was $66.8 million, up 39.2% from fiscal 2024. In the quarter to June 2026, revenue fell 95.6%, EPS fell 433.3% and free cash flow grew 69.7%, each against the same quarter a year earlier. Dividend growth for five consecutive years.

1.10 0.03 −2.65%
Market cap
$65.8M
P/E
7.9×
Fwd P/E
4.2×
Dividend yield
—
F-score
5/9
Altman Z
1.04
Beneish M
−1.00
Dividend safety
n/a
Dec '16 Dec '17 Dec '18 Dec '19 Dec '20 Dec '21 Dec '22 Dec '23 Dec '24 Dec '25
P/E ratio
0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.53 0.00 15.53
Piotroski F-Score
— — 3 3 2 4 4 4 2 5
P/S ratio
0.00 15.87 24.81 9.63 46.52 27.09 1.22 0.77 1.16 1.95
Altman Z-Score
— 0.31 2.96 (0.33) 8.97 (0.04) (3.65) (0.81) (6.43) 1.04
Altman Z″-Score (non-manufacturers)
(23.71) 9.98 9.21 (3.40) 2.45 (4.00) (6.62) (1.33) (13.81) (8.90)
P/FCF ratio
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
P/Operating CF
(0.37) (2.47) (7.28) (10.06) (26.49) (18.09) 1.47 (4.58) (2.38) (15.63)
Beneish M-Score
— 2.44 (0.47) 1.95 (2.40) (3.17) (3.03) 21.97 (4.29) (1.00)
P/B ratio
0.00 0.37 0.85 2.34 3.29 5.60 0.86 0.75 1.21 2.21
Price to Tangible BV
0.00 0.37 0.85 2.34 3.29 5.60 0.86 0.75 1.21 2.21
EV/Sales
0.00 (28.24) (4.29) 5.11 32.92 19.08 (0.82) 0.04 0.06 1.35
EV/EBITDA
0.61 1.35 0.40 0.00 0.00 0.00 1.06 0.17 0.00 14.30
EV/Operating CF
0.61 1.43 0.43 (1.85) (3.58) (5.41) 5.65 (0.11) (0.12) (7.15)
EV/FCF
0.61 1.39 0.40 (1.84) (3.57) (5.41) 5.63 (0.11) (0.12) (7.13)
Quick Ratio
1.54 11.06 9.48 3.40 9.28 7.98 5.09 3.42 2.15 7.40
Current Ratio
1.72 11.29 10.08 3.58 9.70 8.46 5.25 3.53 2.19 7.59
Net Debt/EBITDA
0.31 2.11 2.72 1.31 1.62 1.68 2.64 (3.49) 0.72 (6.38)
Debt/Assets
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Debt/Equity
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Asset Turnover
0.05 0.04 0.04 0.15 0.07 0.11 0.36 0.68 0.33 0.74
Operating CF/Net income
0.97 0.85 0.95 0.82 1.09 0.72 0.17 (1.45) 0.34 (1.47)
Capex/Depreciation
(2.97) (0.07) (5.96) (0.42) (0.21) 0.06 0.00 0.00 0.00 —
Interest Coverage
— (137.72) (37.42) (47.60) (197.29) (45.35) (16.20) — — —
ROE
(169.30%) (258.18%) (41.49%) (63.99%) (76.31%) (81.48%) (56.53%) 24.95% (89.62%) 16.31%
ROA
(434.62%) (85.96%) (37.45%) (51.83%) (60.74%) (55.32%) (31.37%) 14.85% (46.81%) 9.55%
ROIC
0.00% 0.00% (6,493.63%) 0.00% (963.10%) 0.00% 0.00% 43.93% 0.00% 21.04%
Return on Tangible Assets
(463.71%) (54.19%) (36.29%) (85.78%) (62.33%) (64.01%) (50.29%) 24.25% (117.81%) 14.67%
Average Days of Receivables
331.22 542.80 119.46 171.89 241.61 52.80 7.39 178.30 399.23 138.71
Research and Development Expense of Revenue
7,860.60% 1,660.89% 854.39% 362.46% 718.15% 353.45% 88.94% 49.57% 201.67% 57.58%
Selling, General and Administrative Expense of Revenue
2,156.12% 547.75% 324.94% 85.90% 229.80% 228.42% 68.18% 24.62% 49.41% 31.70%
Intangible Assets out of Total Assets
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Share Based Compensation of Revenue
53.73% 72.11% 69.31% 20.81% 52.39% 51.65% 17.05% 7.64% 16.24% 6.47%
Graham Net Nets
5.11 2.66 1.13 0.37 0.27 0.15 0.99 0.70 0.77 0.44
Graham Number
0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.43 0.00 1.89
Earnings Yield
(951.57%) (710.00%) (42.76%) (34.30%) (18.62%) (18.05%) (95.40%) 28.29% (123.30%) 6.44%
Free Cash Flow Yield
(922.37%) (128.00%) (43.03%) (28.81%) (19.82%) (13.02%) (11.88%) (41.24%) (42.19%) (9.70%)
Revenue per Share
1.07 0.77 0.25 1.00 0.42 0.59 1.42 1.97 0.89 1.19
Operating CF per Share
(92.76) (15.12) (2.48) (2.75) (3.84) (2.08) (0.21) (0.63) (0.43) (0.23)
Capex per Share
(2.66) (0.01) (0.15) (0.02) (0.01) 0.00 0.00 0.00 0.00 0.00
Free Cash Flow per Share
(95.42) (15.13) (2.63) (2.77) (3.84) (2.08) (0.21) (0.63) (0.43) (0.23)
Cash per Share
33.04 33.74 7.21 4.52 5.67 4.74 2.90 1.45 0.98 0.72
Shareholders Equity per Share
20.37 32.84 7.24 4.11 5.90 2.86 2.02 2.03 0.85 1.05
Interest Debt per Share
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Book value per Share
20.37 32.84 7.24 4.11 5.90 2.86 2.02 2.03 0.85 1.05
Free Cash Flow
(29.79) (39.14) (42.06) (50.33) (86.03) (64.31) (7.73) (32.99) (23.44) (12.62)
Working Capital
4.95 83.90 111.90 68.75 124.80 139.20 91.92 94.06 58.20 58.42
Capital Expenditures
(0.83) (0.03) (2.44) (0.31) (0.16) 0.04 — — — —
Net Current Asset Value
4.46 83.54 111.07 63.89 117.73 75.09 64.70 55.71 42.86 57.39
EV/EBIT
0.60 1.34 0.40 0.00 0.00 0.00 1.04 0.18 0.00 14.30
Capex to Sales
2.48 0.01 0.61 0.02 0.02 0.00 0.00 0.00 0.00 0.00
Price to Operating Income
0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.73 0.00 20.67
Other line items
Depreciation/Fixed assets
0.19 0.31 0.14 0.33 0.46 0.63 2.36 183.50 0.00 —
Cash ROIC
(178.63%) (22.72%) (18.18%) (32.14%) (33.22%) (27.40%) (4.18%) (18.01%) (23.68%) (12.71%)
Accounts Receivable Turnover
0.21 1.22 1.87 3.69 1.27 4.14 28.73 4.01 0.93 1.72
Accounts Payable Turnover
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Inventory Turnover
— — — — — 0.00 0.00 — — —
Average Days of Payables
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Days of Inventory on Hand
— — — — — 0.00 0.00 — — —
Average Receivables
1.62 1.62 2.12 4.92 7.36 4.41 1.86 25.89 51.59 38.93
Average Payables
2.30 2.30 3.54 3.88 2.65 1.13 0.86 1.00 4.34 4.00
Average Assets
6.89 53.63 111.24 117.55 129.78 162.26 147.94 153.60 146.47 89.73
Average Common Equity
17.68 17.85 100.41 95.21 103.31 110.16 82.11 91.41 76.51 52.57

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