Most Shorted Stocks Today: October 21, 2026 — Top 25 Squeeze Candidates

October 21, 2026 data shows FCEL leading the most-shorted stocks board with a squeeze score of 96.2 and short interest of 33.2% of float. The leaderboard is concentrated in threshold-flagged names, with borrow fees ranging from minimal to extreme across the top 25.

October 21, 2026 Top 25 Short Squeeze Candidates

Rank	Symbol	Squeeze Score	SI % Float	Borrow Fee	Days to Cover	T
1	FCEL	96.2	33.2%	0.3%	3.5	T
2	GRRR	88.2	19.5%	17429.4%	4.4	T
3	NBIS	87.4	19.5%	0.4%	2.2	T
4	CIFR	86.6	21.7%	0.4%	1.7
5	IREN	84.4	23.6%	0.6%	1.7
6	WULF	83.6	31.2%	0.4%	3.3
7	TWST	83.0	19.1%	0.3%	3.2	T
8	CHPT	80.6	19.5%	3.3%	4.9	T
9	RXRX	80.2	30.8%	0.5%	5.1	T
10	LCID	78.4	60.3%	20760.9%	9.0	T
11	CLSK	78.2	30.9%	0.3%	4.5	T
12	LEU	77.2	30.9%	0.5%	7.2	T
13	NVAX	76.8	32.3%	1.1%	5.4	T
14	TE	75.8	39.6%	1.2%	4.2
15	MARA	75.4	26.6%	0.4%	2.9	T
16	ASTS	73.4	24.3%	0.7%	3.8	T
17	INDI	72.4	28.5%	1.0%	10.6	T
18	ASAN	71.8	21.7%	0.3%	3.7	T
19	PRME	71.6	27.9%	0.4%	6.2	T
20	BTDR	70.6	38.1%	0.5%	6.2	T
21	CRBP	69.4	23.1%	0.4%	3.5	T
22	AGEN	68.6	17.0%	0.6%	6.1	T
23	SMR	68.4	22.5%	0.5%	2.4	T
24	OPEN	67.8	24.2%	0.5%	6.9	T
25	IBRX	67.8	30.5%	0.5%	7.8	T

1. FCEL — Squeeze Score 96.2

FCEL leads the board with a squeeze score of 96.2 on October 21, 2026. Short interest sits at 33.2% of float and days to cover is 3.5. The annualized borrow fee is 0.3%. The name is flagged on the FINRA threshold list, indicating sustained heavy short pressure. If borrow availability tightens further, short covering could accelerate.

2. GRRR — Squeeze Score 88.2

GRRR ranks second with a squeeze score of 88.2. Short interest is 19.5% of float and days to cover is 4.4. The borrow fee is 17429.4%, the most expensive cost to borrow on today's board. The symbol carries a threshold flag. A positive catalyst that forces covering could be amplified by the extreme stock-loan cost.

3. NBIS — Squeeze Score 87.4

NBIS posts a squeeze score of 87.4. Short interest stands at 19.5% of float with days to cover at 2.2. The borrow fee is 0.4%. The stock is threshold-flagged. The relatively low days-to-cover figure means covering could compress quickly if short interest begins to unwind.

4. CIFR — Squeeze Score 86.6

CIFR holds rank four with a squeeze score of 86.6. Short interest is 21.7% of float and days to cover is 1.7. The borrow fee is 0.4%. The symbol is not threshold-flagged. With days to cover under two sessions, any shift in short positioning could move through the float rapidly.

5. IREN — Squeeze Score 84.4

IREN ranks fifth with a squeeze score of 84.4. Short interest reaches 23.6% of float and days to cover is 1.7. The borrow fee is 0.6%. The name is not on the threshold list. Low days to cover combined with elevated short interest creates a tight setup if covering pressure emerges.

What the T flag means

The T flag indicates a symbol shows sustained heavy short pressure on the FINRA short-volume file, meaning more than 50% of recent volume was short-side. Full scoring details are available at /methodology/short-squeeze-score.

How the score is built

The Tapeboard squeeze score combines short interest as a percentage of float (35% weight), borrow fee (25%), float utilization (20%), days to cover (15%), and 5-day momentum (5%). Data is attributed to FINRA and SEC. See the complete breakdown at /methodology/short-squeeze-score.

What Changed vs the Previous Record

ASTS drops out of the top 5 (was rank 5, score 82.2).

Traders reviewing today's setups may want to journal their short-interest observations using TradeZella.

Closing

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