As of the latest SEC filings, Spero Therapeutics, Inc. (SPRO) is held by 73 institutional funds. The largest fund shareholder is Guggenheim Total Return Bond Fund (GIBIX), holding an estimated $40,919,917.26 in market value, representing 0.13% of its portfolio.
Funds holding Spero Therapeutics, Inc. (SPRO)
Source: SEC Form N-PORT institutional portfolio disclosures
- Ticker:
- SPRO
- CIK:
- 0001701108
| Fund | Type | Manager | Weight | Market Value | Shares |
Report Date
|
Filing Date
|
|---|---|---|---|---|---|---|---|
|
GIBIX
Guggenheim Total Return Bond Fund
|
MF | Guggenheim | 0.13% | $40,919,917.26 | 43,060,620 | Mar 31, 2026 | Jun 1, 2026 |
|
GIBIX
Guggenheim Total Return Bond Fund
|
MF | Guggenheim | 0.07% | $23,198,135.57 | 22,657,600 | Mar 31, 2026 | Jun 1, 2026 |
|
-
Bond Fund
|
ETF | John Hancock | 0.04% | $11,063,518.08 | 10,641,820 | Feb 28, 2026 | Apr 28, 2026 |
|
GILHX
Guggenheim Limited Duration Fund
|
MF | Guggenheim | 0.19% | $10,952,287.18 | 11,525,250 | Mar 31, 2026 | Jun 1, 2026 |
|
IIBOX
VOYA INTERMEDIATE BOND FUND
|
MF | Voya | 0.05% | $5,777,763.85 | 5,635,000 | Mar 31, 2026 | Jun 1, 2026 |
|
CDSIX
Calvert Short Duration Income Fund
|
MF | Calvert / Morgan Stanley | 0.20% | $5,717,900.36 | 6,010,275 | Mar 31, 2026 | May 26, 2026 |
|
EVTR
Eaton Vance Total Return Bond ETF
|
ETF | Morgan Stanley | 0.11% | $5,440,613.91 | 5,718,810 | Mar 31, 2026 | May 27, 2026 |
|
TCTRX
Nuveen Short Term Bond Fund
|
MF | TIAA / Nuveen | 0.30% | $5,204,599.28 | 5,476,875 | Mar 31, 2026 | May 28, 2026 |
|
HABDX
Harbor Core Plus Fund
|
MF | Independent / Boutique | 0.35% | $4,329,903.33 | 4,580,900 | Apr 30, 2026 | Jun 26, 2026 |
|
SIUPX
Guggenheim Core Bond Fund
|
MF | Guggenheim | 0.14% | $3,937,392.50 | 4,143,375 | Mar 31, 2026 | Jun 1, 2026 |
|
CSIBX
Calvert Bond Fund
|
MF | Calvert / Morgan Stanley | 0.09% | $3,627,430.87 | 3,537,800 | Mar 31, 2026 | May 26, 2026 |
|
HCBRX
Harbor Core Bond Fund
|
MF | Independent / Boutique | 0.20% | $3,304,628.46 | 3,225,750 | Apr 30, 2026 | Jun 26, 2026 |
|
TIORX
Nuveen Core Bond Fund
|
MF | TIAA / Nuveen | 0.03% | $3,032,244.80 | 3,190,875 | Mar 31, 2026 | May 28, 2026 |
|
VTI
VANGUARD TOTAL STOCK MARKET INDEX FUND
|
ETF | Vanguard | 0.00% | $2,894,055.84 | 1,236,776 | Mar 31, 2026 | May 28, 2026 |
|
CLDIX
Calvert Core Bond Fund
|
MF | Calvert / Morgan Stanley | 0.20% | $2,512,071.24 | 2,450,000 | Mar 31, 2026 | May 26, 2026 |
|
TAUSX
Investment Grade Bond Fund
|
MF | John Hancock | 0.05% | $2,405,495.67 | 2,516,505 | Feb 28, 2026 | Apr 28, 2026 |
|
CTRZX
Multi-Manager Total Return Bond Strategies Fund
|
MF | Columbia Threadneedle | 0.02% | $2,290,446.18 | 2,205,000 | Feb 28, 2026 | Apr 27, 2026 |
|
ISIWX
VOYA STRATEGIC INCOME OPPORTUNITIES FUND
|
MF | Voya | 0.11% | $2,260,864.12 | 2,205,000 | Mar 31, 2026 | Jun 1, 2026 |
|
CFBNX
The Bond Fund
|
MF | Independent / Boutique | 0.15% | $1,807,342.89 | 1,900,000 | Apr 30, 2026 | Jun 22, 2026 |
|
JHCR
John Hancock Core Bond ETF
|
ETF | John Hancock | 0.08% | $1,669,997.51 | 1,757,363 | Mar 31, 2026 | May 29, 2026 |
|
TAUSX
Investment Grade Bond Fund
|
MF | John Hancock | 0.03% | $1,513,987.28 | 1,456,280 | Feb 28, 2026 | Apr 28, 2026 |
|
GMDZX
MEDIUM-DURATION BOND FUND
|
MF | Independent / Boutique | 0.04% | $1,484,111.67 | 1,496,250 | Mar 31, 2026 | May 28, 2026 |
|
SIUPX
Guggenheim Core Bond Fund
|
MF | Guggenheim | 0.05% | $1,404,731.39 | 1,372,000 | Mar 31, 2026 | Jun 1, 2026 |
|
JAGBX
Select Bond Trust
|
MF | John Hancock | 0.08% | $1,383,660.42 | 1,351,420 | Mar 31, 2026 | May 29, 2026 |
|
TIIUX
Core Fixed Income Fund
|
MF | Morgan Stanley | 0.07% | $1,352,175.58 | 1,298,500 | Feb 28, 2026 | Apr 27, 2026 |
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