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Ultralife

ULBI on Nasdaq. Market value $107m.

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Who owns it

1 long-term investor we follow owns it, unchanged from 1 last quarter. 52 funds in all.

Jun '25
Dec '25
Jun '26
Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

2 investors own more than 5%.

  • WHITMORE BRADFORD T
    at least 39.6%
    (filed with 3 related holders)
    Since 12 March 2026
    What they said

    WHLLC purchased a total of 187,512 shares of Common Stock from March 12, 2026 through March 16, 2026. The Filers have no plans or proposals which relate to, or would result in, any of the matters referred to in Paragraphs (a) through (j), inclusive, of Item 4 of the Schedule…

    Read the filing
  • 6.6%−1.2 pts
    Since 31 December 2025

From Schedule 13D and 13G filings: anyone owning more than 5% must file one.

What insiders did

In the last 12 months, 4 insiders bought $3m of shares on the open market.

  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    26 May 2026
    Shares
    67,302
    Price
    $6.81
    Value
    $458,327
  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    22 May 2026
    Shares
    8,700
    Price
    $6.33
    Value
    $55,071
  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    21 May 2026
    Shares
    32,876
    Price
    $6.13
    Value
    $201,530
  • Manna Michael Edward
    President and CEO, Director
    Bought
    Date
    18 May 2026
    Shares
    2,000
    Price
    $6.47
    Value
    $12,940
  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    16 March 2026
    Shares
    53,131
    Price
    $6.76
    Value
    $359,166
  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    13 March 2026
    Shares
    100,640
    Price
    $6.32
    Value
    $636,045
  • Manna Michael Edward
    President and CEO, Director
    Bought
    Date
    12 March 2026
    Shares
    2,000
    Price
    $6.01
    Value
    $12,024
  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    12 March 2026
    Shares
    33,741
    Price
    $5.97
    Value
    $201,434
  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    16 December 2025
    Shares
    28,588
    Price
    $5.70
    Value
    $162,952
  • WHITMORE BRADFORD T
    Director
    Bought
    Date
    15 December 2025
    Shares
    14,882
    Price
    $5.66
    Value
    $84,232

From Form 4 filings: insiders must report trades in their own company's shares within two days.

The deep dive

Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.

  • What the business is worth, as a range, and the margin of safety at today’s price
  • Prices to start buying, buy, and buy hard
  • The three things that would make this a mistake
  • Every number footnoted to the filing it came from
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What a finished deep dive looks like

Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.