Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Alphatec Holdings, Inc.

ATEC · Nasdaq · CIK 0001350653 · Healthcare · Medical Devices

INSIDER SIGNAL

61.3 / 100

2 buyers · 4 purchase transaction lines · $2.0M gross purchase

WHY THIS SIGNAL?

Buyer breadthLow
Purchase sizeModerate
RoleModerate
RecencyModerate
ConvictionStrong
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+14.0 / 35
Purchase size+19.6 / 25
Role+13.0 / 20
Recency+5.3 / 10
Conviction+9.4 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 2 insider(s), not 4+
  • ⚠ Role scores low · most senior buyer: CEO (CEO, chair and 10% owners score lowest)

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Valentine KeithDirector
●●●○
MCGINNIS KAREN KDirector
○▼
Blackford Quentin S.Director
○
Pelizzon David RDirector
○
Demski David MDirector
○
Berkowitz Mortimer IIIDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 3 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS2
PURCHASE CONCENTRATION50%Largest buyer: Miles Patrick · $1.0M
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-05-07–2026-05-11

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

61.3 / 100

Latest recorded score

↓ -0.2 ptsversus the previous recorded snapshot
  1. 61.9
  2. 61.8
  3. 61.7
  4. 61.5
  5. 61.3

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

4Purchases
43Sales
41Other Form 4 lines
57SEC filings · 365 days
BUYING4 qualifying P line(s) · 180 days
SELLING2 sale line(s) · context only
OTHER7 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot detected in parsed evidence

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
+15.1%
3M
+8.0%
6M
-6.5%
12M
-23.0%

Volatility & liquidity

Volatility
69.4%
Beta
—
Avg daily value
USD 22.4M

Valuation

Market cap
USD 1.6B
P/E
—

Fundamentals

Profit margin
-18.8%
ROE
-1153.7%
Industry
Medical Devices

Market data

Price data up to: 2026-10-08 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Market cap, Profit margin, ROE · Fiscal year ended: 2025-12-31 · Market cap is the shares outstanding stated on the filing cover multiplied by the latest close. Share count date: 2026-07-28 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
14,074,612
Previous report
14,429,283
Avg daily volume
2,019,718
Days to cover
7.0

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-10Miles PatrickPurchase (P)Common Stock115,000USD 8.81USD 1,013,150SEC filing ↗
2026-05-11Valentine KeithPurchase (P)Common Stock35,000USD 7.00USD 245,000SEC filing ↗
2026-05-08Valentine KeithPurchase (P)Common Stock43,847USD 7.54USD 330,606SEC filing ↗
2026-05-07Valentine KeithPurchase (P)Common Stock56,153USD 7.49USD 420,586SEC filing ↗
2024-08-23Pelizzon David RPurchase (P)Common Stock16,978USD 5.89USD 100,000SEC filing ↗
2024-08-23Bakst EvanPurchase (P)Common Stock35,000USD 5.76USD 201,600SEC filing ↗
2024-08-22Pelizzon David RPurchase (P)Common Stock8,818USD 5.67USD 49,998SEC filing ↗
2024-08-21Demski David MPurchase (P)Common Stock50,000USD 5.67USD 283,500SEC filing ↗
2024-08-02Valentine KeithPurchase (P)Common Stock39,000USD 6.55USD 255,450SEC filing ↗
2024-08-02Demski David MPurchase (P)Common Stock40,000USD 6.56USD 262,400SEC filing ↗
2024-03-14Bakst EvanPurchase (P)Common Stock15,000USD 13.53USD 202,950SEC filing ↗
2024-03-07Blackford Quentin S.Purchase (P)Common Stock20,000USD 12.83USD 256,600SEC filing ↗
2023-11-09Demski David MPurchase (P)Common Stock30,000USD 10.50USD 315,000SEC filing ↗
2023-08-10Pritzker Jennifer N.Purchase (P)Common Stock3,400USD 14.98USD 50,926SEC filing ↗
2023-08-08Pritzker Jennifer N.Purchase (P)Common Stock1,350USD 15.56USD 21,006SEC filing ↗

Form 4 evidence

88 transaction lines in the latest 365-day window; 605 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-05Carls Thomas AndrewAward / grant (A)Common Stock200,000USD 0.00USD 0SEC filing ↗
2026-09-10Miles PatrickPurchase (P)Common Stock115,000USD 8.81USD 1,013,150SEC filing ↗
2026-08-05Marshall Tyson EliotSale (S)Common Stock8,168USD 9.65USD 78,821SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-05Carls Thomas AndrewAward / grant (A)Common Stock200,000USD 0.00USD 0SEC filing ↗
2026-09-10Miles PatrickPurchase (P)Common Stock115,000USD 8.81USD 1,013,150SEC filing ↗
2026-08-05Marshall Tyson EliotSale (S)Common Stock8,168USD 9.65USD 78,821SEC filing ↗
2026-06-11MCGINNIS KAREN KSale (S)Common Stock6,050USD 8.01USD 48,460SEC filing ↗
2026-06-10Valentine KeithAward / grant (A)Common Stock32,012USD 0.00USD 0SEC filing ↗
2026-06-10Pelizzon David RAward / grant (A)Common Stock32,012USD 0.00USD 0SEC filing ↗
2026-06-10MCGINNIS KAREN KAward / grant (A)Common Stock32,012USD 0.00USD 0SEC filing ↗
2026-06-10Demski David MAward / grant (A)Common Stock32,012USD 0.00USD 0SEC filing ↗
2026-06-10Blackford Quentin S.Award / grant (A)Common Stock32,012USD 0.00USD 0SEC filing ↗
2026-06-10Berkowitz Mortimer IIIAward / grant (A)Common Stock32,012USD 0.00USD 0SEC filing ↗
2026-05-11Valentine KeithPurchase (P)Common Stock35,000USD 7.00USD 245,000SEC filing ↗
2026-05-08Valentine KeithPurchase (P)Common Stock43,847USD 7.54USD 330,606SEC filing ↗
2026-05-07Valentine KeithPurchase (P)Common Stock56,153USD 7.49USD 420,586SEC filing ↗
2026-04-07Marshall Tyson EliotOption exercise / conversion (M)Common Stock102,500USD 2.52USD 258,050SEC filing ↗
2026-04-07Marshall Tyson EliotTax withholding (F)Common Stock23,393USD 11.03USD 258,025SEC filing ↗
2026-03-13Lish ScottSale (S)Common Stock260,535USD 12.30USD 3,204,580SEC filing ↗
2026-03-13Koning John ToddSale (S)Common Stock79,789USD 12.36USD 986,192SEC filing ↗
2026-03-11Sponsel DavidSale (S)Common Stock163,452USD 12.52USD 2,046,419SEC filing ↗
2026-03-09Hunsaker Craig ESale (S)Common Stock82,765USD 12.45USD 1,030,424SEC filing ↗
2026-03-09Hunsaker Craig EGift (G)Common Stock600USD 0.00USD 0SEC filing ↗
2026-03-06Hunsaker Craig ESale (S)Common Stock33,602USD 12.22USD 410,616SEC filing ↗
2026-03-05Miles PatrickTax withholding (F)Common Stock219,749USD 12.57USD 2,762,245SEC filing ↗
2026-03-05Marshall Tyson EliotSale (S)Common Stock88,835USD 12.49USD 1,109,549SEC filing ↗
2026-03-05Koning John ToddTax withholding (F)Common Stock68,910USD 12.57USD 866,199SEC filing ↗
2026-02-25Sponsel DavidAward / grant (A)Common Stock318,884USD —USD —SEC filing ↗
2026-02-25Miles PatrickAward / grant (A)Common Stock966,293USD —USD —SEC filing ↗
2026-02-25Marshall Tyson EliotAward / grant (A)Common Stock302,852USD —USD —SEC filing ↗
2026-02-25Lish ScottAward / grant (A)Common Stock459,480USD —USD —SEC filing ↗
2026-02-25Koning John ToddAward / grant (A)Common Stock335,868USD —USD —SEC filing ↗
2026-02-25Hunsaker Craig EAward / grant (A)Common Stock459,480USD —USD —SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerATEC
CIK0001350653
SectorHealthcare
IndustryMedical Devices Yahoo Finance
SEC SIC3841 Surgical & Medical Instruments & Apparatus
ExchangeNasdaq

Data coverage

Local Form 4 history605 transaction lines from 2020-01-02 to 2026-10-05
74 P purchase lines · 205 S sale lines · 326 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.