AMERICAN CENTURY COMPANIES INC
Position in SPRO — Spero Therapeutics, Inc.
CIK 748054
KANSAS CITY, MO
Position in SPRO
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$81,352
+$5,741 QoQ
Shares Held
36,811
-8.5% QoQ
Ownership
0.063%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#29
of 59 holders
Holding Since
Sep 2025
2 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in SPRO Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026AMERICAN CENTURY COMPANIES INC holds $3,618,743,392 across 179 Biotechnology names. SPRO ranks #169 (0.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
1,853,956 | $558,096,374 | |
| 2 | ASND |
Ascendis Pharma A/S
|
1,400,575 | $373,561,364 | |
| 3 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
580,901 | $288,550,953 | |
| 4 | ARGX |
Argenx SE
|
173,193 | $160,683,269 | |
| 5 | IONS |
Ionis Pharmaceuticals Inc
|
1,947,076 | $154,383,656 | |
| 6 | EXEL |
Exelixis, Inc.
|
1,791,664 | $97,484,438 | |
| 7 | HRMY |
Harmony Biosciences Holdings, Inc.
|
2,539,512 | $92,463,631 | |
| 8 | GPCR |
Structure Therapeutics Inc.
|
1,682,179 | $90,282,546 |
All Filings in SPRO
Export CSV
2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $81,352 | 36,811 | Shares | Defined | 2026-08-12 | |
| 2025-09-30 | $75,611 | 40,219 | Shares | Defined | 2025-11-12 | |
| No filing history on record for this holder in this stock. | ||||||