Backblaze, Inc. (BLZE) Ownership
BLZE ownership summary
as of October 18, 2026- Institutions
- 58.6% of shares outstanding
- Insiders
- 4.54% of shares outstanding
- Shares outstanding
- 61.9M
- Float
- 59.4M shares available to trade
- Short interest
- 11.61% 6.9M shares short
- Days to cover
- 3.98 short interest up 25.5% vs prior month
- Institutions 58.63%
- Insiders 4.54%
- Other investors 36.83%
BLZE top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 7.63% | 4.7M | $40.6M | +1.0M (+28.2%) | June 30, 2026 |
| 2 | Driehaus Capital Management LLC | 4.34% | 2.7M | $23.1M | +2.7M (0.0%) | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 4.06% | 2.5M | $21.6M | +170,192 (+7.3%) | June 30, 2026 |
| 4 | Acadian Asset Management LLC | 2.89% | 1.8M | $15.4M | +147,834 (+9.0%) | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 2.46% | 1.5M | $13.1M | +179,904 (+13.4%) | June 30, 2026 |
| 6 | Awm Investment Company Inc | 2.26% | 1.4M | $12.0M | — | June 30, 2026 |
| 7 | Pillsbury Lake Capital LLC | 2.16% | 1.3M | $11.5M | −621,446 (−31.7%) | June 30, 2026 |
| 8 | State Street Corp | 1.97% | 1.2M | $10.5M | +104,348 (+9.4%) | June 30, 2026 |
| 9 | Connor Clark & Lunn Inv Mgmt Ltd | 1.87% | 1.2M | $9.9M | +323,480 (+38.8%) | June 30, 2026 |
| 10 | AQR Capital Management LLC | 1.70% | 1.1M | $9.0M | +388,336 (+58.5%) | June 30, 2026 |
| 11 | Qube Research & Technologies | 1.24% | 766K | $6.6M | +333,849 (+77.2%) | June 30, 2026 |
| 12 | Renaissance Technologies Corp | 1.23% | 763K | $6.6M | −410,049 (−35.0%) | June 30, 2026 |
| 13 | Next Century Growth Investors LLC | 1.11% | 687K | $5.9M | +687,498 (0.0%) | June 30, 2026 |
| 14 | Dimensional Fund Advisors, Inc. | 1.02% | 629K | $5.4M | +111,050 (+21.5%) | June 30, 2026 |
| 15 | Vanguard Portfolio Management, LLC | 0.99% | 614K | $5.3M | −94,103 (−13.3%) | June 30, 2026 |
| 16 | Nuveen, LLC | 0.93% | 578K | $5.0M | +506,698 (+712.2%) | June 30, 2026 |
| 17 | Arrowstreet Capital Limited Partnership | 0.89% | 550K | $4.7M | +249,566 (+83.0%) | June 30, 2026 |
| 18 | Millennium Management LLC | 0.80% | 495K | $4.3M | +372,084 (+301.6%) | June 30, 2026 |
| 19 | Northern Trust Corp | 0.78% | 484K | $4.2M | +50,190 (+11.6%) | June 30, 2026 |
| 20 | Jump Financial LLC | 0.76% | 469K | $4.0M | +410,514 (+700.7%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 16 holders added 7.8M shares and 3 cut 1.1M.
BLZE top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.93% | 1.8M | $15.6M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.47% | 1.5M | $13.1M | −17,600 (−1.1%) | September 30, 2026 |
| 3 | Heptagon Driehaus US Micro Cap Eq C$ Acc | 1.98% | 1.2M | $10.5M | +167,819 (+15.9%) | August 31, 2026 |
| 4 | Fidelity Small Cap Index | 1.04% | 641K | $5.5M | +5,850 (+0.9%) | July 31, 2026 |
| 5 | iShares Russell 2000 Growth ETF | 0.90% | 556K | $4.8M | −703 (−0.1%) | September 30, 2026 |
| 6 | Driehaus Micro Cap Growth USD | 0.68% | 423K | $3.6M | — | July 31, 2026 |
| 7 | Fidelity Enhanced Small Cap Core ETF | 0.67% | 415K | $3.6M | +870 (+0.2%) | September 30, 2026 |
| 8 | Nuveen Quant Small Cap Equity R6 | 0.57% | 351K | $3.0M | — | August 31, 2026 |
| 9 | Vanguard Russell 2000 ETF | 0.54% | 337K | $2.9M | +8,025 (+2.4%) | August 31, 2026 |
| 10 | Schwab US Small-Cap ETF™ | 0.53% | 330K | $2.8M | +216 (+0.1%) | September 30, 2026 |
| 11 | Fidelity Extended Market Index | 0.48% | 296K | $2.5M | −893 (−0.3%) | August 31, 2026 |
| 12 | Adara Smaller Companies | 0.38% | 238K | $2.0M | +32,550 (+15.8%) | August 31, 2026 |
| 13 | Indosuez Funds America Small&Mid Caps G | 0.38% | 235K | $2.0M | — | August 31, 2026 |
| 14 | Lazard Baylight US Sm Cap Eq WW Dist EUR | 0.36% | 225K | $1.9M | +3,080 (+1.4%) | June 30, 2026 |
| 15 | Vanguard VIF Small Co Gr | 0.34% | 208K | $1.8M | −108,266 (−34.2%) | June 30, 2026 |
| 16 | iShares Micro-Cap ETF | 0.30% | 185K | $1.6M | −1,276 (−0.7%) | September 30, 2026 |
| 17 | DFA US Small Cap I | 0.25% | 157K | $1.4M | −3,506 (−2.2%) | August 31, 2026 |
| 18 | Dimensional US Small Cap ETF | 0.25% | 154K | $1.3M | — | September 30, 2026 |
| 19 | Janus Henderson Small Cap Gr Alpha ETF | 0.24% | 147K | $1.3M | +6,265 (+4.5%) | September 30, 2026 |
| 20 | Schwab Small Cap Index | 0.23% | 142K | $1.2M | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
BLZE insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-03-03 | Tina Cessna | Sell | $6.58 | 3,778 | $24,859 |
| 2025-02-27 | Gleb Budman | Sell | $6.61 | 2,863 | $18,924 |
| 2025-02-27 | Marc Suidan | Sell | $6.61 | 1,974 | $13,048 |
| 2025-02-27 | Tina Cessna | Sell | $6.61 | 584 | $3,860 |
| 2024-11-26 | Gleb Budman | Sell | $6.42 | 10,321 | $66,261 |
| 2024-11-26 | Tina Cessna | Sell | $6.42 | 8,874 | $56,971 |
| 2024-08-23 | Gleb Budman | Sell | $6.45 | 4,527 | $29,199 |
| 2024-08-23 | Tina Cessna | Sell | $6.45 | 3,894 | $25,116 |
| 2024-08-22 | Francis P Patchel | Sell | $6.22 | 3,261 | $20,283 |
| 2024-08-21 | Tina Cessna | Sell | $6.34 | 3,095 | $19,622 |
| 2024-08-21 | Gleb Budman | Sell | $6.34 | 3,599 | $22,818 |
| 2024-08-20 | Francis P Patchel | Sell | $6.55 | 13,107 | $85,851 |
| 2024-08-16 | Barbara H Nelson | Sell | $6.79 | 16,000 | $108,640 |
| 2024-05-30 | Francis P Patchel | Sell | $6.45 | 10,328 | $66,616 |
| 2024-05-23 | Francis P Patchel | Sell | $6.64 | 2,647 | $17,576 |
| 2024-05-23 | Tina Cessna | Sell | $6.64 | 2,715 | $18,028 |
| 2024-05-21 | Francis P Patchel | Sell | $6.75 | 2,156 | $14,553 |
| 2024-05-21 | Tina Cessna | Sell | $6.75 | 2,212 | $14,931 |
| 2024-03-26 | Tina Cessna | Sell | $9.95 | 20,000 | $199,000 |
| 2024-02-26 | Francis P Patchel | Sell | $9.84 | 3,434 | $33,791 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
BLZE shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns BLZE
Institutional investors own 58.6% of Backblaze's shares and insiders 4.54%. The largest holder is BlackRock Inc with 7.63% of the shares (4.7M), as of June 30, 2026. Among the top 20 institutions, 16 added shares and 3 reduced their stake in the latest filings. Short interest is 11.61% of the float, or 3.98 days of average trading volume. The share count rose 195.8% since 2019.
Related: BLZE analyst forecast, BLZE key metrics. See the BLZE stock overview for the latest quote and news.
BLZE ownership FAQ
Who owns the most Backblaze stock?
The largest shareholders of Backblaze are BlackRock Inc (7.63%), Driehaus Capital Management LLC (4.34%), Vanguard Capital Management, LLC (4.06%), Acadian Asset Management LLC (2.89%), Geode Capital Management, LLC (2.46%).
What percentage of Backblaze is owned by institutions?
Institutions hold 58.6% of Backblaze's shares outstanding; insiders hold 4.54%.
Which funds own Backblaze?
The largest fund holders of Backblaze are Vanguard MStar Total Stk Mkt Idx Invest (2.93%), iShares Russell 2000 ETF (2.47%), Heptagon Driehaus US Micro Cap Eq C$ Acc (1.98%), Fidelity Small Cap Index (1.04%), iShares Russell 2000 Growth ETF (0.90%).
What is Backblaze's short interest?
6.9M shares of Backblaze were sold short, 11.61% of the float; at the average daily volume it would take 3.98 days to cover.
Are insiders buying or selling Backblaze?
Of the latest 20 reported insider transactions in Backblaze (since February 26, 2024), 0 were purchases and 20 were sales.
How many shares of Backblaze are outstanding?
Backblaze has 61.9M shares outstanding, of which 59.4M are in the public float.