VICOR CORP (VICR)

As of 14 August 2026, short interest in VICR is 1,461,572 shares, up 173,834 shares over the last month. Over the last 48 readings it ranged from 1,043,080 shares (14 November 2025) to 1,865,316 shares (30 August 2024). At the reported average volume of 678K shares a day that is 2.1 days to cover.

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As of 11 September 2026, the short share of VICR volume is 64.2%, up 3.8 points over the last five sessions. Over the last 52 readings it ranged from 34.0% (16 July 2026) to 73.0% (18 August 2026). The latest reading is 7.9 points above the 30-session average of 56.3%, on 321K shares reported.

As of 6 August 2026, the fails-to-deliver balance in VICR is 1,963 shares, up 1,274 shares over the last settlement date. Over the last 52 readings it ranged from 2 shares (10 July 2026) to 123,854 shares (30 June 2026). The latest reading sits at the bottom of that range.

Insiders at VICR reported 11 open-market sells worth $1.8M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Davies Philip D (Corp. VP-Global Sales & Mktg.) on 2026-09-01.

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 the rarer, stronger signal.

3 Form 144 notices on file for VICR worth $941K at the prices reported; 3 in the last 90 days worth $941K. Latest: ZMIRA LAVIE filed on 2026-08-17 to sell 908 shares ($227K) from 2026-08-17.

2 holders above 5% have filed on VICR, all on Schedule 13G (passive). The largest reported stake is JPMORGAN CHASE & CO at 6.9% of the class (2,343,932 shares), filed 2026-07-16 for an event on 2026-06-30.

7 of the 30 tracked managers held VICR at their latest 13F, $323.9M in total at quarter-end prices. AQR Capital Management is the largest at $168.0M (0.1% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 2 cut.

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.

In Q1 2026 (quarter ended 2026-03-31) VICOR CORP reported revenue of $113.0M, up 20.2% from the same quarter a year earlier, and net income of $20.7M (0.44 diluted EPS). In FY 2025 it generated $139.5M of operating cash flow and spent $35.2M on buybacks.

Quarterly, last 8 quarters

Fiscal years, with buybacks and dividends

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 cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-03-31; shares outstanding as of 2015-04-24 from the cover page.