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Spero Therapeutics, Inc.

SPRO Net buying
CIK 0001701108 #4540 in the set updated 21 Sep 2026
Bought (120 mo)
$44.50M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$17.95M
$115.47K on a plan · $1.18M straight out of an exercise
Sold at will
$16.66M
53 of 81 sales
Net
+$26.55M
+$27.84M against sales at will

By person

22 insiders · 115 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
GSK plc entity
10% owner
$7.00M (2)
—
+$7.00M
3,788,012
6.50%
$9.51M
+104.3%
Aquilo Capital Management, LLC entity
10% owner
$22.41M (27)
$15.42M (13)
+$7.00M
11,513,987
19.77%
$28.90M
−8.6%
FORMELA JEAN FRANCOIS
Director
$6.00M (1)
—
+$6.00M
2,408,128
4.14%
$6.04M
+5,529%
Goyal Vikas
Director
$6.00M (1)
—
+$6.00M
1,854,006
3.18%
$4.65M
—
Breum Casper
Director
$3.00M (1)
—
+$3.00M
1,091,774
1.87%
$2.74M
—
Mahadevia Ankit
Director
—
$1.04M (28) scheduled
−$1.04M
703,294
1.21%
$1.77M
+968.6%
Rajavelu Esther
See Remarks
—
$475.99K (8)
−$475.99K
986,851
1.69%
$2.48M
—
Shukla Sath
CEO & President
—
$305.74K (12)
−$305.74K
1,736,883
2.98%
$4.36M
—
Larkin Cristina
Chief Operating Officer
$21.00K (1)
$298.00K (2) scheduled
−$277.00K
63,581
0.1092%
$159.59K
—
Keutzer Timothy
Chief Operating Officer
—
$246.39K (12)
−$246.39K
742,506
1.28%
$1.86M
+29,600%
HAMED KAMAL
Chief Medical Officer
—
$88.62K (2)
−$88.62K
788,117
1.35%
$1.98M
—
JOSEPH TAMARA L
Chief Legal Officer
—
$50.99K (3)
−$50.99K
531,615
0.9129%
$1.33M
—
Sendek Joel
Chief Financial Officer
$70.00K (1)
$35.00K (1) scheduled
+$35.00K
25,362
0.0436%
$63.66K
+149.1%
Zack Debra
Chief Medical Officer
—
—
—
162,311
0.2787%
$407.40K
—
Deshpande Milind
Director
—
—
—
101,454
0.1742%
$254.65K
+516.6%
Tregoning Kathleen
Director
—
—
—
85,000
0.1460%
$213.35K
—
Smith Cynthia
Director
—
—
—
85,000
0.1460%
$213.35K
—
THOMAS FRANK E
Director
—
—
—
85,000
0.1460%
$213.35K
—
Jackson Scott Thomas
Director
—
—
—
85,000
0.1460%
$213.35K
—
VINK PATRICK V.J.J.
Director
—
—
—
85,000
0.1460%
$213.35K
—
Pottage John C Jr
Director
—
—
—
85,000
0.1460%
$213.35K
—
Melnick David A.
Chief Medical Officer
—
—
—
62,081
0.1066%
$155.82K
—

Individual transactions

34
Insider
Date
Role
Action
Shares
Price
Amount
Aquilo Capital Management, LLC
26 Apr 2022
10% owner
Buy indirect
39,727
$5.24
$207.97K
Aquilo Capital Management, LLC
30 Mar 2022
10% owner
Buy indirect
16,885
$8.79
$148.39K
Aquilo Capital Management, LLC
30 Mar 2022
10% owner
Buy indirect
33,115
$8.79
$291.03K
Aquilo Capital Management, LLC
14 Mar 2022
10% owner
Buy indirect
8,006
$7.63
$61.05K
Aquilo Capital Management, LLC
14 Mar 2022
10% owner
Buy indirect
15,702
$7.63
$119.74K
Aquilo Capital Management, LLC
28 Feb 2022
10% owner
Buy indirect
15,104
$9.53
$143.93K
Aquilo Capital Management, LLC
28 Feb 2022
10% owner
Buy indirect
29,729
$9.53
$283.30K
Aquilo Capital Management, LLC
18 Feb 2022
10% owner
Buy indirect
14,828
$9.24
$137.04K
Aquilo Capital Management, LLC
31 Jan 2022
10% owner
Buy indirect
125,000
$11.59
$1.45M
Aquilo Capital Management, LLC
24 Jan 2022
10% owner
Buy indirect
1,599
$10.89
$17.42K
Aquilo Capital Management, LLC
18 Jan 2022
10% owner
Buy indirect
48,488
$12.41
$601.96K
Aquilo Capital Management, LLC
10 Jan 2022
10% owner
Buy indirect
8,867
$12.93
$114.61K
Aquilo Capital Management, LLC
31 Dec 2021
10% owner
Buy indirect
125,000
$15.75
$1.97M
Aquilo Capital Management, LLC
30 Dec 2021
10% owner
Buy indirect
50,000
$15.77
$788.61K
Aquilo Capital Management, LLC
29 Dec 2021
10% owner
Buy indirect
75,493
$14.64
$1.11M
Aquilo Capital Management, LLC
29 Oct 2021
10% owner
Buy indirect
150,000
$17.53
$2.63M
Aquilo Capital Management, LLC
30 Sep 2021
10% owner
Buy indirect
134,543
$18.65
$2.51M
Aquilo Capital Management, LLC
14 Sep 2021
10% owner
Buy indirect
2,156
$18.49
$39.87K
Aquilo Capital Management, LLC
13 Sep 2021
10% owner
Buy indirect
44,210
$18.56
$820.67K
Aquilo Capital Management, LLC
9 Sep 2021
10% owner
Buy indirect
24,749
$18.50
$457.79K
Aquilo Capital Management, LLC
31 Aug 2021
10% owner
Buy indirect
48,645
$18.93
$920.66K
Aquilo Capital Management, LLC
30 Aug 2021
10% owner
Buy indirect
44,042
$17.87
$786.86K
Aquilo Capital Management, LLC
27 Aug 2021
10% owner
Buy indirect
13,957
$16.88
$235.53K
Aquilo Capital Management, LLC
26 Aug 2021
10% owner
Buy indirect
22,982
$16.55
$380.32K
Aquilo Capital Management, LLC
24 Aug 2021
10% owner
Buy indirect
40,170
$16.28
$653.79K
Aquilo Capital Management, LLC
23 Aug 2021
10% owner
Buy indirect
137,835
$16.33
$2.25M
Aquilo Capital Management, LLC
20 Aug 2021
10% owner
Buy indirect
221,190
$14.86
$3.29M
GSK plc
17 Jul 2018
10% owner
Buy indirect
80,000
$12.50
$1.00M
Breum Casper
6 Nov 2017
Director
Buy indirect
214,285
$14.00
$3.00M
Larkin Cristina
6 Nov 2017
Chief Operating Officer
Buy
1,500
$14.00
$21.00K
Sendek Joel
6 Nov 2017
Chief Financial Officer
Buy
5,000
$14.00
$70.00K
Goyal Vikas
6 Nov 2017
Director
Buy indirect
428,571
$14.00
$6.00M
FORMELA JEAN FRANCOIS
6 Nov 2017
Director
Buy indirect
428,571
$14.00
$6.00M
GSK plc
6 Nov 2017
10% owner
Buy indirect
428,571
$14.00
$6.00M
Show all 115 transactions →

What was left out

Form 4 filings counted 197
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 23
Sales on a Rule 10b5-1 plan 4
Sales straight out of an exercise 24
Sales at will 53
Transactions with no price 0
Shares from compensation/vesting 13,007,082
Sales filed before the plan box existed 18
History held since 7 Nov 2017