COSNX Performance — Columbia Overseas Core Fund, Institutional Class
Data updated: 2026-07-29
COSNX returned +8.31% year to date and +26.54% over one year to May 2026. Annualised returns are +19.94% over 3 years and +8.31% over 5 years. The fund beat its International Mid-Cap Blend category average: $100 invested three years ago grew to $173, against $163 for the category, and to $127 over one year, against $122. Volatility over the past three years was 12.40% a year. In the 12 months to May 2026 the fund lost a net $107.8M, and assets reached $997.52M.
COSNX Growth of $100
What $100 invested in Columbia Overseas Core Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the International Mid-Cap Blend category average over the same months.
| Period | COSNX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $127 | $122 |
| 3 years (Jun 2023 – May 2026) | $173 | $163 |
| 5 years (Jun 2021 – May 2026) | $149 | $142 |
| Since data start (Sep 2019 – May 2026) | $204 | $194 |
COSNX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +8.31% |
| 1 year | +26.54% |
| 3 years (annualised) | +19.94% |
| 5 years (annualised) | +8.31% |
COSNX Annual Returns
Calendar-year total returns of Columbia Overseas Core Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +8.31% |
| 2025 | +38.26% |
| 2024 | +3.44% |
| 2023 | +15.57% |
| 2022 | −14.91% |
| 2021 | +9.60% |
| 2020 | +8.62% |
| 2019 (Sep–Dec) | +12.61% |
COSNX Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +6.0% | +4.6% | −8.8% | +5.2% | +1.8% | — | — | — | — | — | — | — |
| 2025 | +4.7% | +2.0% | +2.4% | +3.9% | +4.2% | +4.8% | −1.1% | +5.1% | +2.5% | +0.5% | +1.5% | +2.5% |
| 2024 | −1.4% | 0.0% | +3.6% | −2.3% | +5.1% | −2.3% | +4.0% | +3.1% | +1.6% | −4.4% | +0.4% | −3.5% |
| 2023 | +7.3% | −3.1% | +2.3% | +2.4% | −4.8% | +3.8% | +3.3% | −2.0% | −2.7% | −3.7% | +7.3% | +5.4% |
| 2022 | −2.5% | −2.8% | −1.5% | −6.7% | +2.4% | −9.9% | +3.9% | −3.1% | −10.1% | +6.1% | +11.7% | −1.2% |
| 2021 | −1.1% | +3.3% | +4.2% | +2.3% | +2.8% | −2.7% | +0.5% | +3.0% | −2.5% | +0.7% | −5.2% | +4.3% |
| 2020 | −2.7% | −8.0% | −17.8% | +10.8% | +6.5% | +3.4% | +2.2% | +4.6% | −2.0% | −4.4% | +14.4% | +5.5% |
| 2019 | — | — | — | — | — | — | — | — | +2.7% | +3.8% | +2.0% | +3.5% |
COSNX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 12.40%
- 3-year Sharpe ratio: 1.24 (vs 4.5% risk-free rate)
- Best month: +7.27% (Nov 2023)
- Worst month: −8.80% (Mar 2026)
COSNX Fund Flows
Monthly money in and out of Columbia Overseas Core Fund, from SEC Form N-PORT.
- 12-month net flow: −$107.8M
- 12-month gross sales (incl. reinvestments): $156.0M
- Sales ÷ redemptions: 0.59×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $10.9M | $7.2M | $3.6M |
| Apr 2026 | $5.4M | $17.8M | −$12.4M |
| Mar 2026 | $12.9M | $5.1M | $7.7M |
| Feb 2026 | $5.5M | $21.0M | −$15.5M |
| Jan 2026 | $5.6M | $29.1M | −$23.5M |
| Dec 2025 | $90.0M | $21.0M | $69.0M |
| Nov 2025 | $3.3M | $12.2M | −$9.0M |
| Oct 2025 | $4.3M | $9.4M | −$5.2M |
| Sep 2025 | $5.7M | $23.7M | −$18.0M |
| Aug 2025 | $4.5M | $80.8M | −$76.2M |
| Jul 2025 | $3.4M | $13.2M | −$9.9M |
| Jun 2025 | $4.6M | $23.3M | −$18.6M |
COSNX Assets Under Management
Net assets of Columbia Overseas Core Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $997.52M |
| 2026-02-28 | $1.02B |
| 2025-11-30 | $948.89M |
| 2025-08-31 | $938.66M |
| 2025-05-31 | $960.74M |
| 2025-02-28 | $919.23M |
| 2024-11-30 | $890.43M |
| 2024-08-31 | $942.21M |
| 2024-05-31 | $892.98M |
| 2024-02-29 | $865.60M |
| 2023-11-30 | $837.48M |
| 2023-08-31 | $865.95M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.