Ticker · held by 3 filers

SPOK

SPOK HLDGS INC

All tracked filers currently holding SPOK, ranked by position size. Each row links through to the filer's full portfolio.

Total value held

$38.6M

Total shares

2,753,984

Filers holding

3 · 5 positions

Caveat

long only · 13F-eligible managers only

Filers holding SPOK

sorted by position size · click any filer to see their full portfolio

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM 1,426,913 $21.1M 0.00%

2 Renaissance Technologies · Jim Simons (founder) COM 1,246,579 $16.4M 0.03%

3 Citadel Advisors · Ken Griffin COM 49,692 $655.4K 0.00%

4 Citadel Advisors · Ken Griffin PUTCOM 18,600 $245.3K 0.00%

5 Citadel Advisors · Ken Griffin CALLCOM 12,200 $160.9K 0.00%

What this is

This page reverses the usual 13F view: instead of "what does Buffett hold," it answers "who holds NVDA?" Across the dozen tracked filers, all current 13F-disclosed holders of SPOK are listed, with the position size and what fraction of each filer's overall portfolio it represents.

Caveats: only the filers tracked here are included (~12 names) — not the whole 13F universe (~6,000 filers). Position values are at the most recent quarter-end, not current market price. Only long positions are visible; shorts and synthetics aren't.

v0.2 · 2026 · data via SEC EDGAR · CUSIP→ticker via OpenFIGI