Who owns MongoDB (MDB)?
187 holders named in SEC filings declare between 68.2% and 90.3% of MongoDB's shares outstanding, as of Aug 17, 2026. The largest are Vanguard (10.7%), BlackRock (7.9%) and Fidelity (FMR) (4.5%); the five largest hold 29.6% together. Another 688 institutions hold small positions worth 4.8%. At least 4.9% of the shares appear in no ownership filing: investors who do not have to report, mostly individuals. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 15.5% and sold 13.5% of the shares, a net purchase of 2.0%; 140 opened a position, 317 added, 270 reduced and 101 sold out. Biggest buyers: Fidelity (FMR) (+1.5M shares) and BlackRock (+616,960 shares). Biggest sellers: Jericho Capital Asset Management L.P. (-996,540) and ValueAct Holdings, L.P. (-872,100). Directors and officers, from their latest Form 4: Dwight A. Merriman (1.9%). Over time, 855 managers declared MongoDB in their 13F for Q2 2026, against 280 for Q4 2019: together at most 92.6% of the shares outstanding, against 80.4%.
| Holder | Filing | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|
| Vanguard | 13F | 10.7% | Jun 30, 2026 | Q4 2019 or earlier |
| BlackRock | 13F | 7.9% | Jun 30, 2026 | Q4 2019 or earlier |
| Fidelity (FMR) | 13F | 4.5% | Jun 30, 2026 | Q4 2019 or earlier |
| T. Rowe Price | 13F | 3.3% | Jun 30, 2026 | Q4 2019 or earlier |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main | 13F | 3.1% | Jun 30, 2026 | Q3 2025 |
| State Street | 13F | 2.4% | Jun 30, 2026 | Q4 2019 or earlier |
| UBS | 13F | 2.1% | Jun 30, 2026 | Q4 2019 or earlier |
| Geode Capital | 13F | 1.9% | Jun 30, 2026 | Q4 2019 or earlier |
| AQR | 13F | 1.9% | Jun 30, 2026 | Q4 2019 or earlier |
| Dwight A. Merriman | Form 4 | 1.9% | Aug 17, 2026 | — |
| Norges Bank | 13F | 1.7% | Jun 30, 2026 | Q4 2019 or earlier |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 13F | 1.6% | Jun 30, 2026 | Q1 2025 |
| FIL Ltd | 13F | 1.3% | Jun 30, 2026 | Q1 2025 |
| Invesco | 13F | 1.3% | Jun 30, 2026 | Q4 2019 or earlier |
| Morgan Stanley | 13F | 1.3% | Jun 30, 2026 | Q4 2019 or earlier |
| Capital Group | 13F | 1.3% | Jun 30, 2026 | Q4 2019 or earlier |
| VOYA INVESTMENT MANAGEMENT LLC | 13F | 1.1% | Jun 30, 2026 | Q4 2019 or earlier |
| PRIMECAP MANAGEMENT CO/CA/ | 13F | 1.1% | Jun 30, 2026 | Q3 2020 |
| Harel Insurance Investments & Financial Services Ltd. | 13F | 0.92% | Jun 30, 2026 | Q2 2020 |
| SRS Investment Management, LLC | 13F | 0.92% | Jun 30, 2026 | Q1 2025 |
| D. E. Shaw | 13F | 0.88% | Jun 30, 2026 | Q4 2019 or earlier |
| JPMorgan | 13F | 0.86% | Jun 30, 2026 | Q4 2019 or earlier |
| Polar Capital Holdings Plc | 13F | 0.86% | Jun 30, 2026 | Q3 2025 |
| Nuveen | 13F | 0.83% | Jun 30, 2026 | Q4 2019 or earlier |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 13F | 0.72% | Jun 30, 2026 | Q3 2021 |
MongoDB institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 280 | 80.4% | $6.2B | 67.5% |
| Q4 2020 | 417 | 87.3% | $18.9B | 65.8% |
| Q4 2021 | 535 | 88.9% | $31.4B | 64.8% |
| Q4 2022 | 503 | 89.6% | $12.2B | 69.0% |
| Q4 2023 | 737 | 89.3% | $26.3B | 63.2% |
| Q4 2024 | 697 | 88.2% | $15.3B | 58.2% |
| Q4 2025 | 904 | 89.3% | $30.5B | 61.2% |
| Q2 2026 | 855 | 92.6% | $25.0B | 60.6% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.