Stephen K. Necessary, Director at BLONDER TONGUE LABORATORIES INC (BDR), bought 4,000 shares at $1.24 ($5K) on 2018-06-06, disclosed to the SEC on 2018-06-08.
Open-market purchase of $5k BDR by Director. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history).
Nothing distinguishes this filing.