The Mosaic Company (MOS) Ownership
MOS ownership summary
as of October 18, 2026- Institutions
- 99.0% of shares outstanding
- Insiders
- 0.34% of shares outstanding
- Shares outstanding
- 317.9M
- Float
- 297.8M shares available to trade
- Short interest
- 12.52% 30.0M shares short
- Days to cover
- 3.64 short interest up 3.8% vs prior month
- Institutions 99.03%
- Insiders 0.34%
- Other investors 0.64%
MOS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 7.79% | 24.8M | $465.8M | +1.1M (+4.7%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.53% | 20.7M | $390.4M | +109,328 (+0.5%) | June 30, 2026 |
| 3 | AQR Capital Management LLC | 5.75% | 18.3M | $344.3M | +7.4M (+67.4%) | June 30, 2026 |
| 4 | State Street Corp | 4.73% | 15.0M | $283.0M | +1.6M (+12.2%) | June 30, 2026 |
| 5 | Amvescap Plc. | 4.69% | 14.9M | $280.5M | +3.7M (+32.6%) | June 30, 2026 |
| 6 | Vanguard Portfolio Management, LLC | 4.64% | 14.8M | $277.8M | −546,006 (−3.6%) | June 30, 2026 |
| 7 | Dimensional Fund Advisors, Inc. | 4.53% | 14.4M | $271.2M | +171,357 (+1.2%) | June 30, 2026 |
| 8 | FMR Inc | 4.15% | 13.2M | $248.4M | −15.9M (−54.6%) | June 30, 2026 |
| 9 | Geode Capital Management, LLC | 2.81% | 8.9M | $167.9M | +167,591 (+1.9%) | June 30, 2026 |
| 10 | Donald Smith & Co Inc | 2.43% | 7.7M | $145.4M | +3.1M (+67.3%) | June 30, 2026 |
| 11 | Millennium Management LLC | 2.07% | 6.6M | $124.0M | +6.4M (+2,767.2%) | June 30, 2026 |
| 12 | Morgan Stanley - Brokerage Accounts | 1.62% | 5.2M | $97.0M | +244,416 (+5.0%) | June 30, 2026 |
| 13 | Northern Trust Corp | 1.62% | 5.1M | $96.7M | −33,654 (−0.7%) | June 30, 2026 |
| 14 | NORGES BANK | 1.44% | 4.6M | $86.3M | +307,005 (+7.2%) | June 30, 2026 |
| 15 | The Goldman Sachs Group Inc | 1.32% | 4.2M | $79.0M | −2.6M (−38.2%) | June 30, 2026 |
| 16 | Charles Schwab Investment Management Inc | 1.31% | 4.2M | $78.3M | +260,994 (+6.7%) | June 30, 2026 |
| 17 | Nykredit A/S | 1.16% | 3.7M | $69.5M | +3.7M (0.0%) | June 30, 2026 |
| 18 | Deutsche Bank AG | 1.09% | 3.5M | $64.9M | +588,403 (+20.6%) | June 30, 2026 |
| 19 | T. Rowe Price Associates, Inc. | 1.08% | 3.4M | $64.9M | −2.0M (−37.3%) | June 30, 2026 |
| 20 | UBS Group AG | 1.05% | 3.3M | $62.9M | +1.4M (+74.9%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 15 holders added 30.2M shares and 5 cut 21.1M.
MOS top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.18% | 10.1M | $190.2M | −11,181 (−0.1%) | August 31, 2026 |
| 2 | Vanguard 500 Index Investor | 2.63% | 8.3M | $157.1M | −97,588 (−1.2%) | September 30, 2026 |
| 3 | Invesco S&P 500® Equal Weight ETF | 2.35% | 7.5M | $140.5M | −15,485 (−0.2%) | September 30, 2026 |
| 4 | Vanguard Small Cap Index | 2.25% | 7.2M | $134.7M | −156,823 (−2.1%) | September 30, 2026 |
| 5 | Vanguard MStar Small Cap Value Index | 1.47% | 4.7M | $87.6M | +12,589 (+0.3%) | September 30, 2026 |
| 6 | State Street SPDR Port S&P 500 HiDivETF | 1.35% | 4.3M | $80.7M | +5,520 (+0.1%) | September 30, 2026 |
| 7 | iShares Core S&P 500 ETF | 1.33% | 4.2M | $79.8M | −6,845 (−0.2%) | September 30, 2026 |
| 8 | Fidelity 500 Index | 1.30% | 4.1M | $77.7M | +15,853 (+0.4%) | August 31, 2026 |
| 9 | State Street® SPDR® S&P 500® ETF | 1.24% | 3.9M | $74.1M | — | September 30, 2026 |
| 10 | State Street®MatSelSectSPDR®ETF | 1.20% | 3.8M | $72.0M | −1,201 (−0.0%) | September 30, 2026 |
| 11 | DFA US Small Cap Value I | 1.16% | 3.7M | $69.4M | +93,190 (+2.6%) | August 31, 2026 |
| 12 | Avantis US Small Cap Value ETF | 0.69% | 2.2M | $41.3M | — | September 30, 2026 |
| 13 | DNB Global A | 0.60% | 1.9M | $35.9M | +19,019 (+1.0%) | August 31, 2026 |
| 14 | Northern Trust MstarGlblUpstmNatrlResETF | 0.60% | 1.9M | $35.9M | — | September 30, 2026 |
| 15 | Vanguard Selected Value Inv | 0.56% | 1.8M | $33.5M | +184,200 (+11.5%) | June 30, 2026 |
| 16 | American Funds Washington Mutual A | 0.55% | 1.8M | $33.0M | +251,484 (+16.7%) | September 30, 2026 |
| 17 | Vanguard Institutional Index I | 0.53% | 1.7M | $31.6M | −20,021 (−1.2%) | September 30, 2026 |
| 18 | Schwab US Small-Cap ETF™ | 0.53% | 1.7M | $31.5M | +1,125 (+0.1%) | September 30, 2026 |
| 19 | Dimensional US Small Cap Value ETF | 0.51% | 1.6M | $30.5M | +592 (+0.0%) | September 24, 2026 |
| 20 | Fidelity Dividend Growth | 0.50% | 1.6M | $30.2M | +199,400 (+14.2%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
MOS insider transactions
latest 6| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-23 | Ro Khanna | Buy | $24.09 | — | — |
| 2026-01-29 | Ro Khanna | Sell | $28.02 | — | — |
| 2026-01-09 | Gilbert Ray Cisneros, Jr. | Buy | $25.96 | — | — |
| 2025-11-10 | Ro Khanna | Sell | $25.91 | — | — |
| 2025-09-23 | Val T. Hoyle | Sell | $33.91 | — | — |
| 2025-05-29 | Walter F Precourt III | Sell | $35.73 | 18,000 | $643,140 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
MOS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns MOS
Institutional investors own 99.0% of Mosaic's shares and insiders 0.34%. The largest holder is BlackRock Inc with 7.79% of the shares (24.8M), as of June 30, 2026. Among the top 20 institutions, 15 added shares and 5 reduced their stake in the latest filings. Short interest is 12.52% of the float, or 3.64 days of average trading volume. The share count fell 21.1% since 2014.
Related: MOS analyst forecast, MOS key metrics, MOS dividend history. See the MOS stock overview for the latest quote and news.
MOS ownership FAQ
Who owns the most Mosaic stock?
The largest shareholders of Mosaic are BlackRock Inc (7.79%), Vanguard Capital Management, LLC (6.53%), AQR Capital Management LLC (5.75%), State Street Corp (4.73%), Amvescap Plc. (4.69%).
What percentage of Mosaic is owned by institutions?
Institutions hold 99.0% of Mosaic's shares outstanding; insiders hold 0.34%.
Which funds own Mosaic?
The largest fund holders of Mosaic are Vanguard MStar Total Stk Mkt Idx Invest (3.18%), Vanguard 500 Index Investor (2.63%), Invesco S&P 500® Equal Weight ETF (2.35%), Vanguard Small Cap Index (2.25%), Vanguard MStar Small Cap Value Index (1.47%).
What is Mosaic's short interest?
30.0M shares of Mosaic were sold short, 12.52% of the float; at the average daily volume it would take 3.64 days to cover.
Are insiders buying or selling Mosaic?
Of the latest 6 reported insider transactions in Mosaic (since May 29, 2025), 2 were purchases and 4 were sales.
How many shares of Mosaic are outstanding?
Mosaic has 317.9M shares outstanding, of which 297.8M are in the public float.