You Can Own Less Than One Lot of an IDX Stock. Here's What an Odd Lot Actually Means
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6 min read
Say you own 200 shares of a company that announces a rights issue at a ratio of 200:57. Exercise your full entitlement and you end up holding 257 shares, not a clean 300. That extra 57 shares can't be sold the normal way you sell everything else in your portfolio.
That's an odd lot: any share count below 100, the standard trading unit on the Indonesia Stock Exchange (IDX). It's not a mistake and it's not a penalty. It's just a leftover from how corporate actions do their math, and it changes how you can trade those specific shares until you deal with it.
The IDX's regular market trades in units of 100 shares, called one lot. Own 250 shares and you actually hold 2 full lots (200 shares) plus a 50-share odd lot. Own 2,225 shares and that's 22 lots plus a 25-share odd lot.
The rule matters because the regular market, where nearly all everyday buying and selling happens, will only accept orders in whole lots. A 50-share sell order simply doesn't fit there. This is genuinely common: any corporate action that hands out new shares by ratio, rather than in round numbers, can leave a shareholder with an odd lot without them buying or selling anything themselves.
The two most common triggers are both corporate actions where the company sets a ratio, not a round number.
A rights issue with a ratio that doesn't divide evenly into 100. In 2026, shipping company PT Pelayaran Nasional Ekalya Purnamasari (ELPI) ran a rights issue at a 200:57 ratio: every shareholder on the record date got 57 new-share rights (HMETD) for every 200 shares already held, at an exercise price of Rp350, aiming to raise up to Rp739.34 billion, with unexercised rights covered by standby buyer PT Binaartha Sekuritas (IDN Financials; Indopremier). A holder of exactly 200 shares who exercised in full ended up with 257 shares: 2 clean lots, plus a 57-share odd lot, purely because 57 doesn't round to a multiple of 100.
A bonus share (stock dividend) at a similarly uneven ratio. We covered the mechanics of this in full elsewhere, but the short version: in June 2025, PT Estika Tata Tiara (BEEF) issued bonus shares at a 100:13 ratio, funded from share premium rather than cash earnings (our deep dive on how stock dividends and bonus shares actually work on the IDX). Any holder whose share count wasn't a clean multiple of 100 before that action ended up with an odd lot after it, the same way ELPI's shareholders did.
Buying shares directly in the negotiated market, in a quantity that isn't a multiple of 100, gets you to the same place too. For the dilution math behind why a rights issue ratio is set the way it is, see how to calculate rights issue dilution.
This is the part that actually affects you. The regular market's matching engine only processes orders in whole lots. Try to place a sell order for 57 shares there and your broker's app either won't let you enter it or will only let you sell the whole-lot portion (200 of the 257 shares in the example above) while the odd 57 sits untouched.
That doesn't mean the odd lot is stuck. It means it has to go through a different route.
Odd lot shares trade in the IDX's negotiated market (pasar negosiasi), and in some cases the cash market (pasar tunai), not the regular market. The mechanism is different in kind, not just in name:
One thing that doesn't change: the same 0.1% final income tax (PPh Pasal 4 ayat 2) on gross sale proceeds applies to a negotiated-market odd-lot sale exactly as it does to a regular-market one, withheld automatically at the point of sale.
You have two realistic options, and which one makes sense depends on the size of the odd lot relative to your position.
Neither is objectively better. It comes down to whether you want to hold more of that stock or less of it, which is a decision about the position itself, not about the odd lot mechanics.
An odd lot is easy to miss if you're only glancing at a rounded position size. The fix is keeping an exact count of what you actually hold, transaction by transaction, corporate action included, rather than assuming your holdings always land on round numbers.
Log every purchase, rights exercise and bonus share credit in your Holdings list in NetWort so your real share count, odd lot and all, is always visible, and use Explore to see the full picture of what you're holding across every position before deciding what to do with an odd lot once you spot one.