Here’s a concise comparison of current Treasury-bill (T‑bill) rates quoted by several Sri Lankan banks / brokers and the most recent primary‑auction weighted average yields reported in the news. I list the source and the date the rate was published so you can see which are most recent.

Primary auction WAYRs (reported in media)

• 91‑day (3‑month): 7.50% (auction reported for 26 Mar 2025). (ceylontoday.lk)
• 182‑day (6‑month): 7.84% (26 Mar 2025). (ceylontoday.lk)
• 364‑day (12‑month): 8.25% (26 Mar 2025). (ceylontoday.lk)

Outright / retail / secondary market quotes from banks & brokers (source — published date shown)

• Commercial Bank (Outright / website rates; week of 16–22 Oct 2025)

  • 3‑month: 7.40% (LKR 5.0M & above)
  • 6‑month: 7.60%
  • 12‑month: 7.70%
    Source: Commercial Bank rates page (period shown 16–22 Oct 2025). (combank.lk)

• NSB Fund Management (retail / negotiable rates on their T‑bill page)

  • 3‑month: 7.20%
  • 6‑month: 7.60%
  • 12‑month: 7.75%
    (Rates shown on NSB FMC page; note says negotiable by amount — no explicit page date). (nsbfmc.lk)

• WealthTrust Securities (secondary / tradable volume quotes; dated 29 Aug 2025 on page)

  • 3‑month: Bid 7.7% / Offer 7.5%
  • 6‑month: Bid 8.0% / Offer 7.9%
  • 12‑month: Bid 8.1% / Offer 8.0%
    (Page explicitly dated 2025‑08‑29). (WealthTrust.lk)

What this means and quick takeaways

• Primary auction WAYRs (what the state debt office / CBSL accepts at auction) were around 7.50% (3m), 7.84% (6m) and 8.25% (12m) in the March–June 2025 auction reports — these are the market reference points. Secondary/retail quotes from banks/brokers often differ (some show slightly lower outright sell rates, others show bid/offer spreads). (ceylontoday.lk)
• Differences between providers reflect (a) whether the rate is a retail “outright” sell rate, a bid/offer price in the tradable market, or a negotiated quote for large amounts; (b) timing of the quote; and (c) broker/bank fees or minimum‑amount thresholds. See WealthTrust’s note that secondary quotes are net of their charges and NSB’s note that rates are negotiable by amount. (WealthTrust.lk)
• Retail bank pages sometimes present “outright” rates for particular volume bands (e.g., Commercial Bank shows LKR 5M+ rates) — smaller ticket sizes may get different rates. Always check the minimum amount and any service/placement fees. (combank.lk)

If you want a precise, side‑by‑side comparison for a specific date, ticket size (e.g., LKR 100k vs LKR 5M), and tenor (91/182/364 days), I can fetch current live quotes from additional brokers (e.g., HNB, Sampath, NDB, First Capital, Bartleet) and produce a table showing bid/offer, minimums, fees and the source timestamps. Otherwise the three broker/bank examples above show typical market variation relative to primary auction WAYRs.