InsiderClue
← All stocks

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

24
Insider
Date
Role
Action
Shares
Price
Amount
Mahadevia Ankit
27 Dec 2021
CEO and President
Sold after exercise
8,000
$14.58
$116.67K
Larkin Cristina
16 Dec 2020
Chief Operating Officer
Sold after exercise
12,000
$19.00
$228.00K
Mahadevia Ankit
4 Nov 2020
CEO and President
Sold after exercise
7,370
$14.43
$106.34K
Mahadevia Ankit
3 Nov 2020
CEO and President
Sold after exercise
2,137
$14.27
$30.49K
Mahadevia Ankit
23 Oct 2020
CEO and President
Sold after exercise
20
$14.25
$285.00
Mahadevia Ankit
14 Oct 2020
CEO and President
Sold after exercise
105
$14.25
$1.50K
Mahadevia Ankit
13 Oct 2020
CEO and President
Sold after exercise
14,367
$14.28
$205.21K
Mahadevia Ankit
8 Sep 2020
CEO and President
Sold after exercise
774
$14.25
$11.03K
Mahadevia Ankit
9 Jul 2020
CEO and President
Sold after exercise
2,293
$14.31
$32.81K
Mahadevia Ankit
7 Jul 2020
CEO and President
Sold after exercise
754
$14.25
$10.74K
Mahadevia Ankit
25 Jun 2020
CEO and President
Sold after exercise
2,642
$14.25
$37.65K
Mahadevia Ankit
24 Jun 2020
CEO and President
Sold after exercise
3,880
$14.28
$55.42K
Mahadevia Ankit
23 Jun 2020
CEO and President
Sold after exercise
8,045
$14.33
$115.26K
Mahadevia Ankit
22 Jun 2020
CEO and President
Sold after exercise
2,613
$14.30
$37.36K
Mahadevia Ankit
6 Jul 2018
See Remarks
Sold after exercise
200
$17.92
$3.58K
Mahadevia Ankit
6 Jul 2018
See Remarks
Sold after exercise
200
$17.90
$3.58K
Mahadevia Ankit
6 Jul 2018
See Remarks
Sold after exercise
100
$17.71
$1.77K
Mahadevia Ankit
6 Jul 2018
See Remarks
Sold after exercise
100
$17.62
$1.76K
Mahadevia Ankit
6 Jul 2018
See Remarks
Sold after exercise
400
$17.58
$7.03K
Mahadevia Ankit
6 Jul 2018
See Remarks
Sold after exercise
100
$17.55
$1.75K
Mahadevia Ankit
6 Jul 2018
See Remarks
Sold after exercise
500
$17.50
$8.75K
Mahadevia Ankit
5 Jul 2018
See Remarks
Sold after exercise
3,076
$17.62
$54.20K
Sendek Joel
5 Jul 2018
Chief Financial Officer
Sold after exercise
2,000
$17.50
$35.00K
Larkin Cristina
5 Jul 2018
Chief Operating Officer
Sold after exercise
4,000
$17.50
$70.00K
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