Data & TrustMarket data 2026-09-04

Data Quality#

The validation harness, surfaced. Use this page to judge how much to trust the numbers on the other tabs today.

Bond Pricer Accuracy vs BIST Ground Truth#

For every bond where BIST publishes both price and compound yield today, we run our pricer and compare to BIST. This is the closest thing to ground truth.

Bonds Validated

on 2026-09-04

Median Error

0.064 pp

PASS

95th Pctile

0.82 pp

100% within 1 pp

Max Error

0.99 pp

single worst case

Corporate Bond Yield Coverage#

How many of the 1,098 corporate ISINs in the master have yield data via each source.

Traded today (BIST yield)

freshest source

With auction yield

552

from tbliste

Floaters (require TLREF curve)

548

PENDING TLREF forward curve

Total corp universe

1,098

in dim_instrument

KAP Sukuk Enrichment (SPV → Fund User Mapping)#

Sukuk in this dashboard are issued by Varlık Kiralama SPV entities, but the credit exposure is to a different operating company (the Fon Kullanıcısı). KAP disclosures publish that mapping; we cache it in data/dim/kap_enrichments.csv. See CONVENTIONS.md §14.

Corporate Sukuk Universe

273

private lease certificates

KAP Enriched

273

disclosure parsed

Fund User Mapped

273

100% of universe · GOOD

Total KAP Rows

1,518

includes historical issuances

Credit Rating Coverage#

How many KAP-enriched ISINs come with a published credit rating for the Fund User or Source Org. Investment-grade share among those that do.

Rated Disclosures

1,500

99% of 1,518 · GOOD

Investment Grade

1,374

92% of rated

Below IG

126

non-IG borrowers

Unrated

disclosure didn't publish a rating

Official KAP Debt Event Coverage#

Market-wide fixed-income event ingestion is keyed by disclosure index and expands bulk BIST/MKK notices to ISIN grain. Rating prose remains raw; only MKK cash records are payment confirmation. Current monitoring completeness is shown separately from the long historical backfill. The full history is Parquet-only.

Historical Index

70,356

2010-10-07 to 2026-09-04

Current 22-Day Coverage

100.0%

630/630 fetched · 0 failed · 0 pending · COMPLETE
2026-08-14 to 2026-09-04

Historical Backfill

100.0%

70,356 fetched · 0 failed · 0 pending · COMPLETE

Normalized Events

112,887

70,356 source disclosures

MKK Redemptions

16,967

payment records at ISIN grain

Standalone Ratings

5,473

raw issuer filings

Flagged Source Rows

281

retained for review, never silently corrected

Non-KAP Links

must remain zero

Security Lifecycle Coverage#

Point-in-time BIST instrument snapshots are reconciled to the registered-ISIN list without flattening Fund User, Source Org, and issuer/SPV. The BIST İtfa Tarihi is shown as a contractual date—not as confirmation that cash redemption was completed.

Registered ISINs

23,097

source 2026-09-04

Locally Observed ISINs Matched

72.3%

18,463 of 25,553

Point-in-Time Master

67,437

32 retained snapshots

Maturity Conflicts

source claims retained

Future Contractual Dates

2,126

scheduled after 2026-09-04

Dates Reached

21,190

not payment confirmation

MKK Redemption Records

16,967

confirmed separately from schedule

Unknown Maturity

6,856

no usable source claim

Registry Gaps

7,090

among locally observed ISINs

Lifecycle Exceptions — Review Queue#

The website shows only the 20 highest-priority exceptions. The complete 30,187-row lifecycle registry remains in Parquet and is not embedded in the page.

Highest-priority security lifecycle exceptions, capped at 20 rows
ISIN	Issuer / entity	Exception	Registry date	Other maturity claim	Last observed	Observation rows
TRDEMVK22619	EMLAK KATILIM VARLIK KİRALAMA A.Ş.	maturity_conflict	2026-02-20	2026-02-02	2026-02-20	262
TRDKTLM92314	KATILIM VARLIK KİRALAMA A.Ş.	maturity_conflict	2023-09-21	2024-09-30	2023-09-21	142
TRT210727K30	Hazine / Turkish Treasury	maturity_conflict	2027-07-21	2027-01-21	—	0
TRD071026T17	Hazine / Turkish Treasury	registry_missing	—	2026-10-07	2026-09-04	887
TRT071026T19	Hazine / Turkish Treasury	registry_missing	—	2026-10-07	2026-09-04	491
TRD270127T13	Hazine / Turkish Treasury	registry_missing	—	2027-01-27	2026-09-04	239
TRD120428T32	Hazine / Turkish Treasury	registry_missing	—	2028-04-12	2026-09-04	96
TRD171127T39	Hazine / Turkish Treasury	registry_missing	—	2027-11-17	2026-09-04	88
TRD150328T14	Hazine / Turkish Treasury	registry_missing	—	2028-03-15	2026-09-04	81
TRD180827T17	Hazine / Turkish Treasury	registry_missing	—	2027-08-18	2026-09-04	71
TRD090628T19	Hazine / Turkish Treasury	registry_missing	—	2028-06-09	2026-09-04	50
TRT270127T15	Hazine / Turkish Treasury	registry_missing	—	2027-01-27	2026-05-06	6
TRT120428T18	Hazine / Turkish Treasury	registry_missing	—	2028-04-12	2026-08-25	5
TRT171127T31	Hazine / Turkish Treasury	registry_missing	—	2027-11-17	2026-06-22	1
TRD300628T12	Hazine / Turkish Treasury	registry_missing	—	2028-06-30	—	0
TRT090628T11	Hazine / Turkish Treasury	registry_missing	—	2028-06-09	—	0
TRT150328T16	Hazine / Turkish Treasury	registry_missing	—	2028-03-15	—	0
TRT180827T35	Hazine / Turkish Treasury	registry_missing	—	2027-08-18	—	0
TRT300628T14	Hazine / Turkish Treasury	registry_missing	—	2028-06-30	—	0
TRLTCMB00052	—	registry_missing	—	—	2026-09-04	40,293

Research Archive Coverage#

Long histories remain in annual Parquet and are queried only when an analyst asks for them. This nine-row ledger is built from quality manifests; opening this page does not download the underlying archive records.

First-party historical archive coverage
Source	Coverage	Records	Evidence	Quality control
HMB Treasury auctions	2017-01-02 to 2026-08-31	628 economic auctions	Official auction-result documents	0 failed documents
TCMB EVDS controls	2000-01-01 to 2026-09-04	674,937 observations	2,301 selected official series	0 duplicate IDs
SPK annual approvals	2010-02-12 to 2023-11-02	2,981 application / approval rows	Annual workbooks; ceiling is not issued amount	0 duplicate IDs
SPK Board-bulletin approvals	2023-01-05 to 2026-09-03	1,607 approval-ceiling rows	266 official bulletins	88.07% of comparable 2023 annual keys represented
JCR credit ratings	2008-05-07 to 2026-07-22	15,080 rating observations	2,887 first-party reports	0 duplicate IDs
Kobirate credit ratings	2010-08-25 to 2026-06-11	238 rating observations	119 first-party reports across 43 current public entity pages	25 unclassified-scale and 34 total flagged observations retained
DRC credit ratings	2019-08-26 to 2025-06-18	64 rating observations	32 first-party table rows; 23 official KAP references	0 valid as of 2026-07-24; 15 reports with retained source-reference flags
World Rating credit ratings	2026-02-19 to 2026-06-26	24 rating observations	4 first-party API decisions; 8 national and 16 international observations	4 current-status holds for missing validity; 2 national suffix exceptions retained
TURKrating credit ratings	2011-03-08 to 2026-07-22	753 rating observations	370 borrower and 42 instrument reports from first-party tables	412 current-status holds for missing validity; 2 noncanonical source notches retained
BDDK banking controls	2002-12-31 to 2026-07-31	137,850 monthly observations	22 controls across 10 bank groups	0 duplicate IDs
MKK debt-market controls	2024-07-31 to 2026-07-31	112 canonical observations	13 monthly bulletins with debt pages	2 published-change exceptions retained
MKK system statistics	2020-12-31 to 2026-06-30	947 canonical observations	18 account, investor, holder and transfer measures	4 revisions beyond printed precision retained
TÜİK headline CPI	2005-01-31 to 2026-08-31	1,300 canonical observations	5 official 2025=100 headline series	992 rate checks; 0 failures

Source File Schema Status#

One row per upstream BIST file. OK = expected column set; SHAPE = column count drifted but required fields present; DRIFT = a required field is missing.

Source file schema status table
Source	Status	Rows	Columns	Notes
instrument_activity	OK	328,004	52	all required columns present
valuation	OK	1,140,374	10	all required columns present
dim_instrument	OK	2,062	21	all required columns present
market_summary	OK	56,037	11	all required columns present
tlref	OK	4,794	6	all required columns present
repo_maturity	OK	308,084	10	all required columns present
kap_enrichments	OK	1,518	46	all required columns present
kap_events	OK	112,887	42	all required columns present
kap_event_disclosures	OK	70,356	6	all required columns present
kap_disclosure_index	OK	70,356	15	all required columns present
instrument_master_history	OK	67,437	21	all required columns present
redemption_registry	OK	23,097	4	all required columns present
security_lifecycle	OK	30,187	71	all required columns present

Valuation Mark Freshness — tfd file as of 2026-09-04#

BIST republishes the last trade price daily for non-trading bonds. Pricer pairs each tfd price with its actual LAST TRADE DATE to avoid the carry-forward trap.

Total tfd Marks

439

Same-day Fresh

11.6% of marks

1-7 Days Old

>90 Days Stale

121

INFO

Publication Coverage#

Across 1919 published dates from 2019-01-02 to 2026-09-04.

GAPS 84 missing days — more than typical holiday count. Sample: 2019-04-23, 2019-05-01, 2019-06-04, 2019-06-05, 2019-06-06, 2019-07-15, 2019-08-12, 2019-08-13

About This Page#

This dashboard is built by a public pipeline that fetches BIST files, normalizes them, and runs the bond pricer against documented yield conventions. Source code, tests, and convention documentation live in the same repo. See CONVENTIONS.md for the rules this page enforces.