KRRO Korro Bio, Inc.
Executive Summary
A mixed institutional cluster in KRRO for Q3 2025 shows four buyers (led by Morgan Stanley doubling to $8.0M) adding $12.8M in net new holdings, while two sellers (Citadel trimming 56% and BofA nearly exiting) reduced by $2.9M. The buying is dominated by mega-passive and quant funds, suggesting index rebalancing or systematic positioning rather than a fundamental catalyst, while Citadel's large trim signals caution. The cluster is directionally mixed with passive-heavy buying offset by a quant sell-off, limiting conviction.
Key Financial Metrics
Institutional Positions
Net institutional flow: $9.9M
▲ Buyers (4)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Morgan Stanley | DOUBLED | +104.9% | $8.0M | $7.0M |
| Two Sigma | ADD | +75.4% | $3.1M | $2.6M |
| UBS | DOUBLED | +185.8% | $2.5M | $2.3M |
| Schwab | ADD | +30% | $1.1M | $884.0K |
▼ Sellers (2)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Citadel | TRIM | -56.1% | $4.4M | -$3.0M |
| BofA | NEAR_EXIT | -83.3% | $352.0K | -$126.4K |
Actionable Insight
The cluster is directionally mixed with passive-heavy buying offset by a quant sell-off. Monitor for a fundamental catalyst (e.g., pipeline update or earnings) that could explain the divergence. The lack of active manager participation reduces signal reliability.
Key Facts
- 4 buyers added $12.8M in net new holdings; 2 sellers reduced by $2.9M
- Morgan Stanley doubled its position to $8.0M (104.9% increase), the largest buyer
- Citadel trimmed 56.1% of its stake, reducing from 350.6K to 153.9K shares
- BofA nearly exited, cutting 83.3% of its position to just 4.7K shares
- All buyers are mega-passive or quant funds; no active value or activist funds participated
- Net aggregate institutional buying of ~$9.9M, but passive nature weakens signal
Financial Impact
4 institutions accumulated $14.8M in current holdings (net change +$12.8M), while 2 sellers reduced by $2.9M, for a net institutional inflow of ~$9.9M
Risk Factors
- 13F data is 45+ days stale; positions may have been unwound
- Passive fund buying may reflect index rebalancing, not conviction
- Citadel's large trim could indicate informed selling ahead of negative news
Market Snapshot
Documents Analyzed
This report is based on 1 institutional 13F filing from SEC EDGAR.
| Document | Accession Number |
|---|---|
| INST-CLUSTER Data (Synthetic) | inst-cluster-KRRO-2025-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
|
Jun 11, 2026
1d ago
|
Institutional Cluster
| $10.62 awaiting T+1 | awaiting T+1 | — | — |
|
Jun 2, 2026
11d ago
|
Insider Cluster
| $11.00 $11.08 | ▲ +0.73% | ▲ +1.45% | — |
|
May 19, 2026
25d ago
|
8-K
| $9.15 $10.01 | ▲ +9.40% | ▲ +8.36% | — |
|
Apr 16, 2026
8w ago
|
DEFA14A
| $13.47 $14.39 | ▲ +6.83% | ▲ +5.62% | — |
|
Mar 23, 2026
11w ago
|
EFFECT
| $11.27 $10.58 | ▼ −6.12% | ▼ −5.77% | — |
|
Mar 13, 2026
13w ago
|
S-3
| $12.60 $12.31 | ▲ +2.30% | ▲ +2.57% | — |
|
Mar 10, 2026
13w ago
|
Insider Cluster
| $11.48 $11.76 | ▲ +2.44% | ▲ +2.54% | — |
|
Mar 9, 2026
13w ago
|
Press Release
| $12.30 $11.48 | ▼ −6.67% | ▼ −6.48% | — |
US Market Status
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