Axcelis Technologies (ACLS)
Axcelis Technologies on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as special industry machinery, nec.
1.4M
Short interest
settlement 2026-09-30
3.8
Days to cover
-0.7 days vs prior
88.9%
Short share of volume
2026-10-09
300
Fails to deliver
settlement 2026-08-24
Tue 3 Nov
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-09.
Short interest
FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in ACLS is 1,439,547 shares, down 185,820 shares over the last month. Over the last 48 readings it ranged from 1,434,982 shares (15 September 2026) to 5,612,077 shares (30 April 2025). The latest reading sits at the bottom of that range. At the reported average volume of 378K shares a day that is 3.8 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/acls" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 1,439,547 | +0.3% | 378,497 | 3.80 |
| 2026-09-15 | 1,434,982 | -11.7% | 320,339 | 4.48 |
| 2026-08-31 | 1,625,367 | -3.4% | 307,584 | 5.28 |
| 2026-08-14 | 1,682,955 | +4.3% | 406,701 | 4.14 |
| 2026-07-31 | 1,612,811 | -8.9% | 406,026 | 3.97 |
| 2026-07-15 | 1,769,809 | -6.8% | 564,458 | 3.14 |
| 2026-06-30 | 1,899,085 | -0.8% | 716,719 | 2.65 |
| 2026-06-15 | 1,913,857 | -24.9% | 647,501 | 2.96 |
| 2026-05-29 | 2,546,993 | -3.2% | 473,035 | 5.38 |
| 2026-05-15 | 2,631,151 | -12.0% | 808,239 | 3.26 |
| 2026-04-30 | 2,990,185 | -14.6% | 791,388 | 3.78 |
| 2026-04-15 | 3,501,747 | -7.8% | 575,185 | 6.09 |
| 2026-03-31 | 3,797,370 | +2.5% | 760,614 | 4.99 |
| 2026-03-13 | 3,702,963 | +0.1% | 727,456 | 5.09 |
| 2026-02-27 | 3,698,624 | -25.9% | 1,457,097 | 2.54 |
| 2026-02-13 | 4,989,876 | +5.0% | 774,429 | 6.44 |
| 2026-01-30 | 4,751,091 | +2.4% | 502,898 | 9.45 |
| 2026-01-15 | 4,639,745 | +15.7% | 605,897 | 7.66 |
| 2025-12-31 | 4,011,398 | -4.8% | 372,299 | 10.77 |
| 2025-12-15 | 4,214,041 | +3.5% | 580,560 | 7.26 |
| 2025-11-28 | 4,071,565 | +6.7% | 469,204 | 8.68 |
| 2025-11-14 | 3,815,940 | -12.9% | 772,531 | 4.94 |
| 2025-10-31 | 4,379,799 | -2.1% | 511,810 | 8.56 |
| 2025-10-15 | 4,473,247 | +12.9% | 1,041,204 | 4.30 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 9 October 2026, the short share of ACLS volume is 88.9%, up 21.8 points over the last five sessions. Over the last 30 readings it ranged from 36.6% (2 September 2026) to 88.9% (9 October 2026). The latest reading sits at the top of that range. The latest reading is 29.6 points above the 30-session average of 59.4%, on 84K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-09 | 75K | 84K | 88.9% | 1 |
| 2026-10-08 | 59K | 91K | 65.5% | 0 |
| 2026-10-07 | 68K | 83K | 81.9% | 87 |
| 2026-10-06 | 46K | 73K | 63.5% | 0 |
| 2026-10-05 | 84K | 118K | 71.5% | 0 |
| 2026-10-02 | 138K | 206K | 67.2% | 0 |
| 2026-10-01 | 92K | 166K | 55.5% | 0 |
| 2026-09-30 | 95K | 154K | 61.6% | 0 |
| 2026-09-29 | 106K | 177K | 60.1% | 0 |
| 2026-09-28 | 78K | 143K | 54.1% | 588 |
| 2026-09-25 | 100K | 181K | 55.6% | 350 |
| 2026-09-24 | 107K | 203K | 52.5% | 0 |
| 2026-09-23 | 93K | 232K | 40.1% | 62 |
| 2026-09-22 | 54K | 93K | 58.2% | 0 |
| 2026-09-21 | 58K | 119K | 48.7% | 202 |
| 2026-09-18 | 33K | 71K | 47.0% | 361 |
| 2026-09-17 | 113K | 166K | 68.5% | 70 |
| 2026-09-16 | 122K | 183K | 67.0% | 0 |
| 2026-09-15 | 66K | 129K | 50.7% | 0 |
| 2026-09-14 | 98K | 200K | 49.3% | 300 |
| 2026-09-11 | 91K | 119K | 76.6% | 0 |
| 2026-09-10 | 49K | 73K | 67.3% | 0 |
| 2026-09-09 | 68K | 121K | 56.2% | 0 |
| 2026-09-08 | 40K | 88K | 45.6% | 0 |
| 2026-09-04 | 69K | 154K | 44.7% | 0 |
| 2026-09-03 | 55K | 104K | 53.1% | 0 |
| 2026-09-02 | 69K | 190K | 36.6% | 13 |
| 2026-09-01 | 76K | 125K | 60.4% | 533 |
| 2026-08-31 | 69K | 104K | 66.3% | 0 |
| 2026-08-28 | 77K | 116K | 66.8% | 9,955 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 24 August 2026, the fails-to-deliver balance in ACLS is 300 shares, up 245 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (14 April 2026) to 31,697 shares (30 June 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-08-24 | 300 | $127.07 | $38K |
| 2026-08-21 | 55 | $124.97 | $7K |
| 2026-08-05 | 7,040 | $139.70 | $983K |
| 2026-07-06 | 2 | $144.50 | $289 |
| 2026-06-30 | 31,697 | $176.13 | $5.6M |
| 2026-06-29 | 1,101 | $173.23 | $191K |
| 2026-06-25 | 43 | $168.91 | $7K |
| 2026-06-23 | 11 | $183.92 | $2K |
| 2026-06-22 | 672 | $187.53 | $126K |
| 2026-06-18 | 46 | $175.45 | $8K |
| 2026-06-11 | 7,316 | $157.43 | $1.2M |
| 2026-06-09 | 386 | $154.76 | $60K |
| 2026-06-05 | 619 | $161.87 | $100K |
| 2026-06-04 | 4 | $159.19 | $637 |
| 2026-06-03 | 5,307 | $158.78 | $843K |
| 2026-06-02 | 4,704 | $150.42 | $708K |
| 2026-06-01 | 43 | $150.41 | $6K |
| 2026-05-28 | 99 | $157.91 | $16K |
| 2026-05-19 | 88 | $146.24 | $13K |
| 2026-05-18 | 43 | $155.18 | $7K |
| 2026-05-13 | 2,582 | $161.64 | $417K |
| 2026-05-11 | 562 | $163.03 | $92K |
| 2026-05-07 | 1,930 | $171.00 | $330K |
| 2026-05-04 | 7 | $139.99 | $980 |
| 2026-04-21 | 179 | $131.02 | $23K |
| 2026-04-20 | 9,633 | $118.73 | $1.1M |
| 2026-04-17 | 42 | $118.76 | $5K |
| 2026-04-16 | 8 | $117.88 | $943 |
| 2026-04-14 | 1 | $110.74 | $111 |
| 2026-04-02 | 697 | $95.51 | $67K |
Insider trades
SEC Form 4, newest first, 50 of 100 shown. JSONNo open-market insider trades were reported for ACLS in the last 90 days. The most recent filings are listed below. Latest filing: Tatnall Christopher (EVP Global Customer Operations) on 2026-09-15.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-09-15 | Tatnall Christopher | EVP Global Customer Operations | Tax withholding | 136 | $105.04 | $14K | 27K |
| 2026-09-15 | Redinbo Greg | EVP and Chief Strategy Officer | Tax withholding | 208 | $105.04 | $22K | 35K |
| 2026-07-15 | Ryzhik David | SVP Interim CFO | Tax withholding | 94 | $145.01 | $14K | 10K |
| 2026-07-15 | Ryzhik David | SVP Interim CFO | Tax withholding | 127 | $145.01 | $18K | 10K |
| 2026-06-16 | Ryzhik David | SVP Interim CFO | Tax withholding | 76 | $176.84 | $13K | 10K |
| 2026-06-15 | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | Tax withholding | 506 | $191.60 | $97K | 20K |
| 2026-06-03 | Sayiner Necip | Director | Sell | 2K | $157.44 | $250K | 7K |
| 2026-06-02 | Mahoney Robert John | EVP Global Operations | Sell | 1K | $155.24 | $179K | 14K |
| 2026-05-27 | Sutton Todd | VP Corporate Controller | Sell | 2K | $159.99 | $320K | 6K |
| 2026-05-22 | Evans Eileen | EVP, General Counsel and Sec'y | Sell | 926 | $155.51 | $144K | 31K |
| 2026-05-22 | St Dennis Thomas | Director | Sell | 900 | $155.37 | $140K | 18K |
| 2026-05-21 | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | Sell | 1K | $152.70 | $177K | 20K |
| 2026-05-20 | Tatnall Christopher | EVP Global Customer Operations | Sell | 1K | $149.75 | $175K | 28K |
| 2026-05-19 | Quirk Jeanne | Director | Sell | 2K | $140.22 | $251K | 11K |
| 2026-05-19 | GRAVES GREGORY B | Director | Sell | 600 | $142.51 | $86K | 5K |
| 2026-05-19 | GRAVES GREGORY B | Director | Sell | 3K | $141.41 | $371K | 6K |
| 2026-05-19 | KURTZWEIL JOHN T | Director | Sell | 4K | $138.79 | $486K | 33K |
| 2026-05-18 | Sutton Todd | VP Corporate Controller | Tax withholding | 184 | $146.24 | $27K | 8K |
| 2026-05-18 | Mahoney Robert John | EVP Global Operations | Tax withholding | 130 | $146.24 | $19K | 16K |
| 2026-05-18 | Mahoney Robert John | EVP Global Operations | Tax withholding | 182 | $146.24 | $27K | 16K |
| 2026-05-18 | Redinbo Greg | EVP MARKETING AND APPLICATIONS | Tax withholding | 79 | $146.24 | $12K | 35K |
| 2026-05-18 | Redinbo Greg | EVP MARKETING AND APPLICATIONS | Tax withholding | 111 | $146.24 | $16K | 35K |
| 2026-05-18 | Low Russell | PRESIDENT AND CEO | Tax withholding | 711 | $146.24 | $104K | 155K |
| 2026-05-15 | Mahoney Robert John | EVP Global Operations | Grant | 2K | $0.00 | $0 | 17K |
| 2026-05-15 | Tatnall Christopher | EVP Global Customer Operations | Grant | 4K | $0.00 | $0 | 30K |
| 2026-05-15 | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | Grant | 3K | $0.00 | $0 | 23K |
| 2026-05-15 | Redinbo Greg | EVP MARKETING AND APPLICATIONS | Grant | 3K | $0.00 | $0 | 36K |
| 2026-05-15 | Evans Eileen | EVP, General Counsel and Sec'y | Grant | 4K | $0.00 | $0 | 33K |
| 2026-05-15 | Low Russell | PRESIDENT AND CEO | Grant | 19K | $0.00 | $0 | 163K |
| 2026-05-15 | Quirk Jeanne | Director | Grant | 1K | $0.00 | $0 | 13K |
| 2026-05-15 | Chiu Tzu Yin | Director | Grant | 1K | $0.00 | $0 | 12K |
| 2026-05-15 | Titinger Jorge | Director | Grant | 1K | $0.00 | $0 | 6K |
| 2026-05-15 | St Dennis Thomas | Director | Grant | 1K | $0.00 | $0 | 19K |
| 2026-05-15 | Sayiner Necip | Director | Grant | 1K | $0.00 | $0 | 9K |
| 2026-05-15 | GRAVES GREGORY B | Director | Grant | 1K | $0.00 | $0 | 9K |
| 2026-05-15 | KURTZWEIL JOHN T | Director | Grant | 1K | $0.00 | $0 | 36K |
| 2026-05-15 | Sutton Todd | VP Corporate Controller | Tax withholding | 103 | $155.18 | $16K | 9K |
| 2026-05-15 | Sutton Todd | VP Corporate Controller | Tax withholding | 112 | $155.18 | $17K | 9K |
| 2026-05-15 | Sutton Todd | VP Corporate Controller | Tax withholding | 226 | $155.18 | $35K | 9K |
| 2026-05-15 | Sutton Todd | VP Corporate Controller | Grant | 1K | $0.00 | $0 | 9K |
| 2026-05-15 | Ryzhik David | SVP Interim CFO | Tax withholding | 226 | $155.18 | $35K | 10K |
| 2026-05-15 | Ryzhik David | SVP Interim CFO | Grant | 3K | $0.00 | $0 | 10K |
| 2026-05-15 | Mahoney Robert John | EVP Global Operations | Tax withholding | 61 | $155.18 | $9K | 16K |
| 2026-05-15 | Mahoney Robert John | EVP Global Operations | Tax withholding | 170 | $155.18 | $26K | 16K |
| 2026-05-15 | Mahoney Robert John | EVP Global Operations | Tax withholding | 173 | $155.18 | $27K | 16K |
| 2026-05-15 | Mahoney Robert John | EVP Global Operations | Tax withholding | 372 | $155.18 | $58K | 16K |
| 2026-05-15 | Mahoney Robert John | EVP Global Operations | Grant | 2K | $0.00 | $0 | 15K |
| 2026-05-15 | Tatnall Christopher | EVP Global Customer Operations | Tax withholding | 170 | $155.18 | $26K | 29K |
| 2026-05-15 | Tatnall Christopher | EVP Global Customer Operations | Tax withholding | 345 | $155.18 | $54K | 29K |
| 2026-05-15 | Tatnall Christopher | EVP Global Customer Operations | Tax withholding | 744 | $155.18 | $115K | 29K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON22 Form 144 notices on file for ACLS worth $6.3M at the prices reported; 0 in the last 90 days worth $0. Latest: NECIP SAYINER filed on 2026-06-03 to sell 1,586 shares ($250K) from 2026-06-03.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-06-03 | NECIP SAYINERDirector | 2K | $250K | 0.005% | 2026-06-03 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-06-02 | ROBERT MAHONEYOfficer | 1K | $179K | 0.004% | 2026-06-02 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-27 | TODD SUTTONOfficer | 2K | $320K | 0.007% | 2026-05-27 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-22 | THOMAS M. ST. DENNISDirector | 900 | $140K | 0.003% | 2026-05-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-22 | EILEEN EVANSOfficer | 926 | $144K | 0.003% | 2026-05-22 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-21 | GERALD BLUMENSTOCKOfficer | 1K | $177K | 0.004% | 2026-05-21 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-20 | CHRISTOPHER TATNALLOfficer | 1K | $175K | 0.004% | 2026-05-20 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-19 | JOHN THOMAS KURTZWEILDirector | 4K | $486K | 0.011% | 2026-05-19 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-19 | JEANNE QUIRKDirector | 2K | $251K | 0.006% | 2026-05-19 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-19 | GREGORY GRAVESDirector | 3K | $457K | 0.010% | 2026-05-19 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-14 | TODD SUTTONOfficer | 3K | $422K | 0.008% | 2026-05-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-14 | GERALD BLUMENSTOCKOfficer | 1K | $165K | 0.003% | 2026-05-14 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-13 | JORGE TITINGERDirector | 2K | $328K | 0.007% | 2026-05-13 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-13 | GREGORY F REDINBOOfficer | 3K | $464K | 0.009% | 2026-05-13 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-12 | ROBERT MAHONEYOfficer | 2K | $364K | 0.007% | 2026-05-12 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-06 | RUSSELL LOWOfficer | 7K | $1.0M | 0.024% | 2026-05-06 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-05-01 | RUSSELL LOWOfficer | 1K | $173K | 0.004% | 2026-05-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-04-01 | RUSSELL LOWOfficer | 1K | $116K | 0.004% | 2026-04-01 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-03-24 | RUSSELL LOWDirector, Officer | 1K | $107K | 0.004% | 2026-03-24 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2026-02-20 | JORGE TITINGERDirector | 1K | $80K | 0.003% | 2026-02-20 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-17 | JORGE TITINGERDirector | 2K | $172K | 0.006% | 2025-12-17 | Morgan Stanley Smith Barney LLC Executive Financial Services |
| 2025-12-11 | GERALD BLUMENSTOCKOfficer | 3K | $271K | 0.010% | 2025-12-11 | Morgan Stanley Smith Barney LLC Executive Financial Services |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON4 holders report 5% or more of ACLS in their latest filing, all on Schedule 13G (passive). The largest reported stake is FMR LLC at 13.4% of the class (4,122,402 shares), filed 2026-08-06 for an event on 2026-06-30.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-06 | 13G/Ano. 2 | FMR LLCparent holding company | 4.1M | 13.4% | 2026-06-30 |
| 2026-08-06 | 13G/Ano. 2 | Abigail P. Johnsonindividual | 4.1M | 13.4% | 2026-06-30 |
| 2026-07-14 | 13G/Ano. 1 | REINHART PARTNERS, LLC.investment adviser | 929K | 3.0% | 2026-06-30 |
| 2026-04-29 | 13G | Vanguard Capital Managementinvestment adviser | 1.6M | 5.3% | 2026-03-31 |
| 2026-04-28 | 13G | Vanguard Portfolio Managementinvestment adviser | 2.5M | 8.1% | 2026-03-31 |
| 2026-03-26 | 13G/Ano. 9 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2025-11-14 | 13G/Ano. 1 | American Century Investment Management, Inc.investment adviser | 1.3M | 4.3% | 2025-09-30 |
| 2025-11-14 | 13G/Ano. 1 | American Century Companies, Inc.parent holding company | 1.3M | 4.3% | 2025-09-30 |
| 2025-11-14 | 13G/Ano. 1 | Stowers Institute for Medical Researchparent holding company | 1.3M | 4.3% | 2025-09-30 |
13F holders
Tracked managers holding ACLS at their latest 13F. JSON6 of the 30 tracked managers held ACLS at their latest 13F, $76.8M in total at quarter-end prices. Millennium Management is the largest at $26.4M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 3 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Millennium Management | 2026-06-30 | 139K | $26.4M | 0.01% | +127K |
| D. E. Shaw & Co. | 2026-06-30 | 133K | $25.2M | 0.01% | -411K |
| Two Sigma Investments | 2026-06-30 | 48K | $9.2M | 0.01% | -149K |
| Citadel Advisors | 2026-06-30 | 46K | $8.8M | 0.00% | +42K |
| AQR Capital Management | 2026-06-30 | 36K | $6.7M | 0.00% | -4K |
| Point72 Asset Management | 2026-06-30 | 3K | $568K | 0.00% | +750 |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
Financials
SEC XBRL, as filed. JSONIn Q2 FY 2026 (quarter ended 2026-06-30) Axcelis Technologies reported revenue of $215.2M, up 10.6% from the same quarter a year earlier, and net income of $23.3M (0.75 diluted EPS). In FY 2025 it generated $118.3M of operating cash flow and spent $121.1M on buybacks.
- Cash
- $155.0M
- Equity
- $1.07B
- Total assets
- $1.39B
- Shares outstanding
- 30,881,489
Quarterly, last 8 quarters
| Quarter | Period end | Revenue | Net income | Margin | Diluted EPS |
|---|---|---|---|---|---|
| Q2 FY 2026 | 2026-06-30 | $215.2M | $23.3M | 10.8% | 0.75 |
| Q1 FY 2026 | 2026-03-31 | $199.0M | $9.2M | 4.6% | 0.30 |
| Q4 FY 2025derived | 2025-12-31 | $238.3M | $34.3M | 14.4% | n/a |
| Q3 FY 2025 | 2025-09-30 | $213.6M | $26.0M | 12.2% | 0.83 |
| Q2 FY 2025 | 2025-06-30 | $194.5M | $31.4M | 16.1% | 0.98 |
| Q1 FY 2025 | 2025-03-31 | $192.6M | $28.6M | 14.8% | 0.88 |
| Q4 FY 2024derived | 2024-12-31 | $252.4M | $50.0M | 19.8% | n/a |
| Q3 FY 2024 | 2024-09-30 | $256.6M | $48.6M | 18.9% | 1.49 |
Fiscal years, with buybacks and dividends
| Fiscal year | Ends | Revenue | Net income | Operating cash flow | Capex | Buybacks | Dividends |
|---|---|---|---|---|---|---|---|
| FY 2025 | 2025-12-31 | $839.0M | $120.2M | $118.3M | $11.3M | $121.1M | n/a |
| FY 2024 | 2024-12-31 | $1.02B | $201.0M | $140.8M | $12.2M | $60.5M | n/a |
| FY 2023 | 2023-12-31 | $1.13B | $246.3M | $156.9M | $20.7M | $52.5M | n/a |
| FY 2022 | 2022-12-31 | $920.0M | n/a | $215.6M | $10.7M | $57.5M | n/a |
| FY 2021 | 2021-12-31 | $662.4M | n/a | $150.2M | $8.7M | $50.0M | n/a |
Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-08-03 from the cover page.
What this page is
Axcelis Technologies in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Axcelis Technologies (ACLS), SEC CIK 1113232, listed on Nasdaq, classified by the SEC as special industry machinery, nec. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-09.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-08-24.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-06-03.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-06.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Financials
- SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-06.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-09-15.JSON and CSV
- Company record
- EDGAR filing index for CIK 1113232Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Frequently Asked Questions
How much of ACLS is sold short?
What is ACLS's daily short volume?
Does ACLS have fails to deliver?
Are ACLS insiders buying or selling?
Have ACLS insiders filed to sell?
Who owns 5% or more of ACLS?
What did ACLS report last quarter?
Which tracked 13F managers own ACLS?
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.