Small-Cap Insider Buying: 9 Clusters Worth Watching (July 30, 2026)

When one insider buys stock on the open market, it's a data point. When several insiders at the same company file separate Form 4s in the same window, it's a pattern — officers and directors see the order book, the backlog, and the budget long before the market does. Each week, SCN pulls every Form 4 accepted by the SEC, strips out the noise (option exercises, grants, fund-complex adds dressed up as insider buys), and screens for true clusters: two or more insiders, filing separately, buying with their own money at companies between $50M and $2B in market cap.

This window (filings July 16–29) produced 428 open-market purchase records across 3,527 Form 4 filings. After collapsing related filers and applying the market-cap band, 9 genuine clusters made the cut.

The screen

Ticker	Company	Mkt cap	Insiders	Total bought	Their avg	Last (Jul 30)	Note
FSBC	Five Star Bancorp	~$1.0B	6	$6,280,000	$44.00	$47.40	Board bought into the Jul 22 offering
CLBK	Columbia Financial	new listing	16	$4,779,000	$10.00	$10.96	Entire C-suite + board subscribed in the second-step offering
CRDF	Cardiff Oncology	~$58M	2	$1,050,000	$1.46	$0.84	Director's $1M buy now –42%
RBKB	Rhinebeck Bancorp	~$139M	4	$656,000	$11.95	$12.44	CEO + 3, near 52-wk high
BYRN	Byrna Technologies	~$102M	5	$305,000	$3.47	$4.41	CEO + CFO + 3 directors at the washout low
NNOX	Nano-X Imaging	~$67M	3	$110,000	$0.92	$0.97	CEO + chairman near all-time lows
ANIX	Anixa Biosciences	~$119M	2	$107,000	$3.47	$3.47	CEO + chairman, 6 filings in 2 weeks
GABC	German American Bancorp	~$1.9B	5	$95,000	$48.40	$51.82	5 directors post-earnings; new 52-wk high
CHCO	City Holding Co	~$1.9B	4	$59,700	$147.80	$144.60	4 directors, same day

The standouts

Five Star Bancorp (FSBC) — the board bought its own offering. The Sacramento-based bank priced a capital raise at $44.00 on July 22 (424B5 on file), and six of its directors personally bought a combined $6.28M of it — led by Larry Allbaugh at $4.25M and Robert Perry-Smith at $1.38M. Capital raises at banks usually read as dilution; a board writing seven-figure personal checks into its own deal reads like something else. The stock has already moved to $47.40, about 8% above deal price and within sight of its 52-week high. What to watch: where the new capital goes — loan growth and NIM in the next two prints will tell you whether this was offense or defense.

Columbia Financial (CLBK) — sixteen insiders, one offering, zero abstentions. The widest cluster of the window, added in tonight's update: in the New Jersey thrift's second-step offering (Form 4s dated July 20), sixteen separate insiders — CEO Thomas Kemly, the CFO, COO, chief risk officer, and effectively the entire executive team and board — filed purchases totaling $4.78M, every share at the $10.00 subscription price. Post-conversion thrifts are a structure with a long record of building book value per share, and nobody knows that math better than the people who just ran the conversion. At $10.96 the group is up about 10% on cost. What to watch: capital deployment — the classic post-conversion levers are buybacks and a rising dividend once regulatory waiting periods clear.

Byrna Technologies (BYRN) — five insiders caught the falling knife, so far correctly. A brutal year — the stock entered the trailing twelve months near $22.50 and bottomed at $3.17 in mid-July, an ~85% drawdown. Then, over July 22–28, five separate insiders — CEO Conn Davis, CFO Laurilee Kearnes, and three directors — filed purchases totaling $305k at $3.40–$3.63. The dollars are modest; the breadth is not. Five separate filings across the C-suite and board inside a week, at the low, is the textbook cluster shape. At $4.41 the group is already up ~27% on cost. What to watch: whether the next quarter shows the demand stabilization the board evidently believes in.

Cardiff Oncology (CRDF) — the uncomfortable one. Director Gary Pace put $1.0M to work at $1.455 on July 14, with CEO Mani Mohindru adding $50k alongside. Two weeks later the stock trades at $0.84 — the buys are down 42%. Clinical-stage oncology is binary by nature, and this is the honest part of publishing a screen rather than a highlight reel: clusters are a signal about insider conviction, not a verdict on the stock. Either the board sees something the market doesn't, or the market is repricing something the board won't. The trial calendar will settle it.

Worth a line each: RBKB — four buyers including the CEO at a savings institution sitting near its 52-week high; insiders buying strength is rarer, and historically better-performing, than insiders buying dips. NNOX — CEO Erez Meltzer and chairman Dan Suesskind (the longtime Teva CFO) buying at $0.90–$0.94 with the stock down ~80% on the year. ANIX — a steady CEO-plus-chairman drip: six separate filings over two weeks, ~$107k combined. GABC and CHCO — board-wide, same-day, small-dollar buys days after Q2 earnings at two conservative community banks; GABC has since broken to a new 52-week high.

What didn't make the cut — and why that matters

Raw insider feeds this window showed some enormous “buys” that aren't what they look like: Michael Dell's MSD vehicles seeding a private lending fund with $44.6M, Abu Dhabi Investment Authority putting $25M into a Jefferies credit BDC, Blackstone seeding its own vehicles — over $95M of non-traded fund formation coded as insider buying. We strip it. Three single-buyer adds in listed names are worth knowing about even though one buyer isn't a cluster: Fairmount Funds added $12.4M of Crescent Biopharma (CBIO) near its 13-week low, RA Capital added $4.4M of Artiva (ARTV) into strength, and a family-office group filed $8.6M of purchases in Energizer (ENR).

Methodology

All 3,527 Form 4 filings accepted by EDGAR July 16–29 → open-market purchases only (transaction code P, transactions dated on/after July 1) → related filers collapsed to one economic buyer → clusters require ≥2 insiders filing separately → market cap $50M–$2B at July 30 prices (IBKR). Questions on the method? Reply to the newsletter or find SCN on X.

Update (July 30, evening): Columbia Financial (CLBK) was added after first publication. Its brand-new holding-company CIK didn't yet carry shares-outstanding data in SEC XBRL, so the market-cap filter silently dropped it — sixteen separate insider filings is too many to lose on a technicality. The count in the title moved from 8 to 9, and the filter now flags new registrants instead of discarding them.

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Disclosure: The author has no position in any security mentioned. This article is for informational purposes only and is not investment advice. See our Disclaimer and Disclosures.