Stocks · Health care · Pharmaceutical Preparations

Spero Therapeutics, Inc.

SPRO Clue Score55
United States Fiscal year ends December CIK 0001701108
$1.20 +5.26% Close, 9 Oct 2026

Price, with every insider trade on it

Closing prices, 12 months · point at a dot for who traded, or at the line for the close
1.20 on 9 Oct 2026
3 2 1 Oct 2025 Apr 2026 Oct 2026 13 Oct 2025 $2.29 14 Oct 2025 $2.36 15 Oct 2025 $2.49 16 Oct 2025 $2.35 17 Oct 2025 $2.21 20 Oct 2025 $2.29 21 Oct 2025 $2.37 22 Oct 2025 $2.25 23 Oct 2025 $2.20 24 Oct 2025 $2.21 27 Oct 2025 $2.29 28 Oct 2025 $2.38 29 Oct 2025 $2.33 30 Oct 2025 $2.36 31 Oct 2025 $2.43 3 Nov 2025 $2.38 4 Nov 2025 $2.35 5 Nov 2025 $2.43 6 Nov 2025 $2.39 7 Nov 2025 $2.46 10 Nov 2025 $2.50 11 Nov 2025 $2.62 12 Nov 2025 $2.66 13 Nov 2025 $2.44 14 Nov 2025 $2.41 17 Nov 2025 $2.43 18 Nov 2025 $2.47 19 Nov 2025 $2.38 20 Nov 2025 $2.26 21 Nov 2025 $2.31 24 Nov 2025 $2.38 25 Nov 2025 $2.34 26 Nov 2025 $2.33 28 Nov 2025 $2.40 1 Dec 2025 $2.27 2 Dec 2025 $2.20 3 Dec 2025 $2.28 4 Dec 2025 $2.28 5 Dec 2025 $2.26 8 Dec 2025 $2.31 9 Dec 2025 $2.33 10 Dec 2025 $2.33 11 Dec 2025 $2.35 12 Dec 2025 $2.32 15 Dec 2025 $2.29 16 Dec 2025 $2.27 17 Dec 2025 $2.31 18 Dec 2025 $2.29 19 Dec 2025 $2.32 22 Dec 2025 $2.37 23 Dec 2025 $2.33 24 Dec 2025 $2.34 26 Dec 2025 $2.32 29 Dec 2025 $2.30 30 Dec 2025 $2.27 31 Dec 2025 $2.33 2 Jan 2026 $2.35 5 Jan 2026 $2.43 6 Jan 2026 $2.51 7 Jan 2026 $2.60 8 Jan 2026 $2.57 9 Jan 2026 $2.55 12 Jan 2026 $2.51 13 Jan 2026 $2.45 14 Jan 2026 $2.51 15 Jan 2026 $2.40 16 Jan 2026 $2.41 20 Jan 2026 $2.38 21 Jan 2026 $2.36 22 Jan 2026 $2.45 23 Jan 2026 $2.44 26 Jan 2026 $2.45 27 Jan 2026 $2.37 28 Jan 2026 $2.23 29 Jan 2026 $2.25 30 Jan 2026 $2.19 2 Feb 2026 $2.23 3 Feb 2026 $2.14 4 Feb 2026 $2.29 5 Feb 2026 $2.30 6 Feb 2026 $2.42 9 Feb 2026 $2.36 10 Feb 2026 $2.36 11 Feb 2026 $2.37 12 Feb 2026 $2.38 13 Feb 2026 $2.39 17 Feb 2026 $2.35 18 Feb 2026 $2.33 19 Feb 2026 $2.40 20 Feb 2026 $2.30 23 Feb 2026 $2.24 24 Feb 2026 $2.23 25 Feb 2026 $2.22 26 Feb 2026 $2.21 27 Feb 2026 $2.17 2 Mar 2026 $2.19 3 Mar 2026 $2.19 4 Mar 2026 $2.29 5 Mar 2026 $2.29 6 Mar 2026 $2.30 9 Mar 2026 $2.32 10 Mar 2026 $2.45 11 Mar 2026 $2.59 12 Mar 2026 $2.59 13 Mar 2026 $2.58 16 Mar 2026 $2.59 17 Mar 2026 $2.58 18 Mar 2026 $2.46 19 Mar 2026 $2.47 20 Mar 2026 $2.37 23 Mar 2026 $2.35 24 Mar 2026 $2.37 25 Mar 2026 $2.41 26 Mar 2026 $2.37 27 Mar 2026 $2.33 30 Mar 2026 $2.24 31 Mar 2026 $2.34 1 Apr 2026 $2.45 2 Apr 2026 $2.43 6 Apr 2026 $2.61 7 Apr 2026 $2.67 8 Apr 2026 $2.72 9 Apr 2026 $2.78 10 Apr 2026 $2.67 13 Apr 2026 $2.78 14 Apr 2026 $2.78 15 Apr 2026 $2.64 16 Apr 2026 $2.68 17 Apr 2026 $2.75 20 Apr 2026 $2.84 21 Apr 2026 $2.80 22 Apr 2026 $2.86 23 Apr 2026 $2.80 24 Apr 2026 $2.74 27 Apr 2026 $2.67 28 Apr 2026 $2.67 29 Apr 2026 $2.53 30 Apr 2026 $2.51 1 May 2026 $2.48 4 May 2026 $2.50 5 May 2026 $2.42 6 May 2026 $2.53 7 May 2026 $2.51 8 May 2026 $2.56 11 May 2026 $2.55 12 May 2026 $2.54 13 May 2026 $2.44 14 May 2026 $2.76 15 May 2026 $2.79 18 May 2026 $2.58 19 May 2026 $2.59 20 May 2026 $2.63 21 May 2026 $2.69 22 May 2026 $2.76 26 May 2026 $2.86 27 May 2026 $2.93 28 May 2026 $2.90 29 May 2026 $2.83 1 Jun 2026 $2.83 2 Jun 2026 $2.83 3 Jun 2026 $2.80 4 Jun 2026 $2.98 5 Jun 2026 $2.82 8 Jun 2026 $2.74 9 Jun 2026 $2.57 10 Jun 2026 $2.54 11 Jun 2026 $2.70 12 Jun 2026 $2.85 15 Jun 2026 $2.91 16 Jun 2026 $2.77 17 Jun 2026 $2.11 18 Jun 2026 $2.28 22 Jun 2026 $2.21 23 Jun 2026 $2.15 24 Jun 2026 $2.10 25 Jun 2026 $2.02 26 Jun 2026 $2.26 29 Jun 2026 $2.26 30 Jun 2026 $2.21 1 Jul 2026 $2.22 2 Jul 2026 $2.20 6 Jul 2026 $2.19 7 Jul 2026 $2.16 8 Jul 2026 $2.17 9 Jul 2026 $2.12 10 Jul 2026 $2.10 13 Jul 2026 $2.18 14 Jul 2026 $1.70 15 Jul 2026 $1.70 16 Jul 2026 $1.57 17 Jul 2026 $1.58 20 Jul 2026 $1.44 21 Jul 2026 $1.38 22 Jul 2026 $1.27 23 Jul 2026 $1.16 24 Jul 2026 $1.19 27 Jul 2026 $1.18 28 Jul 2026 $1.20 29 Jul 2026 $1.19 30 Jul 2026 $1.20 31 Jul 2026 $1.17 3 Aug 2026 $1.15 4 Aug 2026 $1.23 5 Aug 2026 $1.26 6 Aug 2026 $1.27 7 Aug 2026 $1.26 10 Aug 2026 $1.23 11 Aug 2026 $1.23 12 Aug 2026 $1.19 13 Aug 2026 $1.24 14 Aug 2026 $1.23 17 Aug 2026 $1.19 18 Aug 2026 $1.20 19 Aug 2026 $1.23 20 Aug 2026 $1.21 21 Aug 2026 $1.22 24 Aug 2026 $1.22 25 Aug 2026 $1.23 26 Aug 2026 $1.22 27 Aug 2026 $1.21 28 Aug 2026 $1.20 31 Aug 2026 $1.22 1 Sep 2026 $1.20 2 Sep 2026 $1.22 3 Sep 2026 $1.22 4 Sep 2026 $1.21 8 Sep 2026 $1.19 9 Sep 2026 $1.17 10 Sep 2026 $1.12 11 Sep 2026 $1.13 14 Sep 2026 $1.14 15 Sep 2026 $1.13 16 Sep 2026 $1.11 17 Sep 2026 $1.12 18 Sep 2026 $1.13 21 Sep 2026 $1.14 22 Sep 2026 $1.36 23 Sep 2026 $1.26 24 Sep 2026 $1.25 25 Sep 2026 $1.23 28 Sep 2026 $1.19 29 Sep 2026 $1.20 30 Sep 2026 $1.21 1 Oct 2026 $1.26 2 Oct 2026 $1.19 5 Oct 2026 $1.16 6 Oct 2026 $1.19 7 Oct 2026 $1.17 8 Oct 2026 $1.14 9 Oct 2026 $1.20 Rajavelu Esther See Remarks Sold at will $95.44K 7 Nov 2025 · at $2.37 · 4.4% of stake Rajavelu Esther See Remarks Sold at will $40.57K 2 Feb 2026 · at $2.20 · 1.6% of stake Keutzer Timothy Chief Operating Officer Sold at will $41.56K 2 Feb 2026 · at $2.20 · 2.3% of stake Keutzer Timothy Chief Operating Officer Sold at will $51.84K 3 Feb 2026 · at $2.14 · 3.1% of stake Keutzer Timothy Chief Operating Officer Sold at will $7.78K 4 Feb 2026 · at $2.24 · 0.5% of stake Keutzer Timothy Chief Operating Officer Sold at will $44.02K 6 Feb 2026 · at $2.36 · 2.5% of stake Rajavelu Esther See Remarks Sold at will $207.48K 6 Feb 2026 · at $2.36 · 8.0% of stake Rajavelu Esther See Remarks Sold at will $63.35K 4 May 2026 · at $2.51 · 2.5% of stake
0 buys8 sales at will0 planned sales

Key numbers

Fiscal year 2025, ended 31 Dec 2025, as filed
Revenue
$12.59M
Net income
$8.57M
Free cash flow
$12.62M
Operating margin
50.2%
Net margin
68.1%
Return on equity
14.5%
Return on capital
10.4%
Revenue growth, 1 yr
3,292.5%
Revenue growth, 5 yr
117.6% a year

Revenue and profit

Fiscal years, as filed with the SEC · point at a year for the detail
Full statements →
258K -78M FY20 Fiscal year 2020 Revenue $258.00K Net income $78.30M Margin -30,348.8% 3M -90M FY21 Fiscal year 2021 Revenue $3.07M Net income $89.80M Margin -2,925.1% · growth +1,089.9% 3M -46M FY22 Fiscal year 2022 Revenue $2.50M Net income $46.42M Margin -1,854.4% · growth -18.5% 933K 23M FY23 Fiscal year 2023 Revenue $933.00K Net income $22.81M Margin 2,444.4% · growth -62.7% 371K -69M FY24 Fiscal year 2024 Revenue $371.00K Net income $68.57M Margin -18,481.4% · growth -60.2% 13M 9M FY25 Fiscal year 2025 Revenue $12.59M Net income $8.57M Margin 68.1% · growth +3,292.5%
RevenueNet incomeLoss

Latest insider transactions

From Form 4, most recent first
All of them →
DateInsiderTypeValueOf own stake
4 May 2026 Rajavelu Esther
See Remarks
Sold at will $63.35K 2.5%
6 Feb 2026 Rajavelu Esther
See Remarks
Sold at will $207.48K 8.0%
6 Feb 2026 Keutzer Timothy
Chief Operating Officer
Sold at will $44.02K 2.5%
4 Feb 2026 Keutzer Timothy
Chief Operating Officer
Sold at will $7.78K 0.5%
3 Feb 2026 Keutzer Timothy
Chief Operating Officer
Sold at will $51.84K 3.1%
2 Feb 2026 Keutzer Timothy
Chief Operating Officer
Sold at will $41.56K 2.3%