Simulations Plus (SLP)

Simulations Plus on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as services-computer integrated systems design.

Download CSV

2.9M

Short interest

settlement 2026-09-30

15.2

Days to cover

+0.4 days vs prior

49.3%

Short share of volume

2026-10-05

211

Fails to deliver

settlement 2026-09-14

Wed 21 Oct

Next earnings

estimated date

-$18K

Insider flow, 90 days

0 buys, 1 sells

As of 2026-10-06.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in SLP is 2,879,422 shares, up 42,558 shares over the last month. Over the last 48 readings it ranged from 944,778 shares (15 October 2024) to 2,892,884 shares (15 September 2026). The latest reading sits at the top of that range. At the reported average volume of 189K shares a day that is 15.2 days to cover.

Embed this chart.The embed keeps its attribution line.

<iframe src="https://xoomar.com/embed/stocks/slp" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>

Preview Dark previewAdd ?theme=dark to the src for a dark chart.

Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	2,879,422	-0.5%	189,477	15.20
2026-09-15	2,892,884	+2.0%	195,390	14.81
2026-08-31	2,836,864	+0.7%	159,425	17.79
2026-08-14	2,818,580	-0.9%	178,271	15.81
2026-07-31	2,844,266	+59.7%	542,524	5.24
2026-07-15	1,780,772	+44.7%	390,999	4.55
2026-06-30	1,230,399	-10.6%	997,516	1.23
2026-06-15	1,375,887	+0.6%	199,988	6.88
2026-05-29	1,367,536	-1.6%	217,378	6.29
2026-05-15	1,389,278	+6.3%	465,575	2.98
2026-04-30	1,306,998	+6.2%	315,565	4.14
2026-04-15	1,231,136	+2.6%	495,033	2.49
2026-03-31	1,199,762	-4.4%	202,942	5.91
2026-03-13	1,254,798	-5.4%	194,321	6.46
2026-02-27	1,326,450	+2.5%	295,776	4.48
2026-02-13	1,294,697	+7.9%	519,147	2.49
2026-01-30	1,200,216	+5.4%	275,073	4.36
2026-01-15	1,138,320	-3.0%	425,291	2.68
2025-12-31	1,172,905	+2.1%	225,973	5.19
2025-12-15	1,149,138	-12.2%	427,113	2.69
2025-11-28	1,308,277	+2.7%	443,831	2.95
2025-11-14	1,273,980	+8.3%	360,783	3.53
2025-10-31	1,176,740	+5.0%	452,164	2.60
2025-10-15	1,120,611	-4.5%	520,233	2.15

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 5 October 2026, the short share of SLP volume is 49.3%, up 2.3 points over the last five sessions. Over the last 30 readings it ranged from 15.9% (26 August 2026) to 74.5% (18 September 2026). The latest reading is 3.0 points above the 30-session average of 46.3%, on 96K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-05	47K	96K	49.3%	3
2026-10-02	72K	199K	36.4%	0
2026-10-01	237K	338K	70.1%	0
2026-09-30	33K	154K	21.4%	0
2026-09-29	10K	28K	37.0%	0
2026-09-28	17K	37K	47.0%	0
2026-09-25	12K	28K	42.0%	0
2026-09-24	76K	185K	40.8%	0
2026-09-23	22K	46K	46.6%	0
2026-09-22	40K	75K	53.3%	0
2026-09-21	33K	66K	50.8%	11
2026-09-18	12K	17K	74.5%	0
2026-09-17	9K	15K	63.8%	0
2026-09-16	28K	41K	68.9%	24
2026-09-15	29K	44K	67.1%	15
2026-09-14	35K	97K	36.4%	0
2026-09-11	28K	42K	67.0%	0
2026-09-10	30K	113K	26.9%	2,277
2026-09-09	33K	97K	34.1%	101
2026-09-08	24K	43K	55.1%	100
2026-09-04	13K	26K	52.0%	0
2026-09-03	161K	248K	64.7%	0
2026-09-02	53K	92K	57.3%	0
2026-09-01	22K	44K	49.8%	0
2026-08-31	15K	36K	41.2%	0
2026-08-28	10K	33K	29.8%	0
2026-08-27	12K	35K	34.3%	0
2026-08-26	5K	32K	15.9%	0
2026-08-25	9K	40K	23.4%	0
2026-08-24	18K	58K	31.5%	0

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 14 September 2026, the fails-to-deliver balance in SLP is 211 shares, down 730 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (5 August 2026) to 221,907 shares (22 July 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-09-14	211	$18.42	$4K
2026-08-27	941	$18.41	$17K
2026-08-26	1,763	$18.39	$32K
2026-08-25	1,312	$18.40	$24K
2026-08-24	1,098	$18.40	$20K
2026-08-21	436	$18.38	$8K
2026-08-17	4,856	$18.35	$89K
2026-08-12	42	$18.31	$769
2026-08-05	1	$18.35	$18
2026-08-04	13,664	$18.31	$250K
2026-08-03	11,100	$18.23	$202K
2026-07-30	104	$18.33	$2K
2026-07-27	2,289	$18.34	$42K
2026-07-24	3,937	$18.33	$72K
2026-07-22	221,907	$18.23	$4.0M
2026-07-17	957	$18.23	$17K
2026-06-30	7	$18.38	$129
2026-06-15	1,996	$16.32	$33K
2026-06-05	430	$16.65	$7K
2026-05-26	333	$15.37	$5K
2026-05-21	300	$14.47	$4K
2026-05-18	47	$13.34	$627
2026-05-15	17,229	$13.38	$231K
2026-05-13	383	$13.96	$5K
2026-05-11	570	$16.68	$10K
2026-05-08	80	$16.06	$1K
2026-05-05	10,962	$15.15	$166K
2026-05-04	1,195	$14.91	$18K
2026-04-29	103	$14.87	$2K
2026-04-22	4,856	$15.31	$74K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at SLP reported 1 open-market sell worth $18K in the last 90 days and no open-market buys. Latest filing: WEINER DANIEL L (Director) on 2026-10-06.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-10-06	WEINER DANIEL L	Director	Disposition	17K	$18.50	$306K	0
2026-10-06	WOLTOSZ WALTER S	Director, 10% owner	Disposition	3.2M	$18.50	$59.2M	0
2026-10-06	Paglia John Kenneth	Director	Disposition	15K	$18.50	$270K	0
2026-10-06	Fiedler-Kelly Jill	President, Services Solutions	Disposition	78K	$18.50	$1.4M	0
2026-10-06	FREDERICK WILLIAM W	EVP/CFO	Disposition	2K	$18.50	$39K	0
2026-10-06	Evans Sharlene	Director	Disposition	17K	$18.50	$318K	0
2026-10-06	DiBella John Anthony II	Chief Revenue Officer	Disposition	85K	$18.50	$1.6M	0
2026-08-03	DiBella John Anthony II	Chief Revenue Officer	Sell	1K	$18.28	$18K	85K
2026-07-06	DiBella John Anthony II	Chief Revenue Officer	Sell	1K	$18.36	$18K	86K
2026-07-01	WOLTOSZ WALTER S	Director, 10% owner	Sell	4K	$18.44	$77K	3.2M
2026-06-16	Fiedler-Kelly Jill	President, Services Solutions	Sell	7K	$18.20	$134K	78K
2026-06-16	Fiedler-Kelly Jill	President, Services Solutions	Option exercise	7K	$10.05	$74K	85K
2026-06-15	Fiedler-Kelly Jill	President, Services Solutions	Sell	1K	$16.51	$17K	78K
2026-06-15	Fiedler-Kelly Jill	President, Services Solutions	Option exercise	1K	$10.05	$11K	79K
2026-06-03	DiBella John Anthony II	Chief Revenue Officer	Sell	1K	$16.50	$17K	87K
2026-06-01	WOLTOSZ VIRGINIA E	TenPercentOwner	Sell	15K	$17.43	$261K	3.3M
2026-06-01	WOLTOSZ WALTER S	Director, 10% owner	Sell	15K	$17.43	$261K	3.3M
2026-05-11	Fiedler-Kelly Jill	President, Services Solutions	Sell	1K	$16.53	$17K	78K
2026-05-11	Fiedler-Kelly Jill	President, Services Solutions	Option exercise	1K	$10.05	$10K	79K
2026-05-04	WOLTOSZ WALTER S	Director, 10% owner	Sell	15K	$15.13	$227K	3.3M
2026-05-04	DiBella John Anthony II	Chief Revenue Officer	Sell	1K	$14.98	$15K	88K
2026-05-01	WOLTOSZ WALTER S	Director, 10% owner	Grant	2K	$0.00	$0	3.3M
2026-05-01	WEINER DANIEL L	Director	Grant	2K	$0.00	$0	17K
2026-05-01	Paglia John Kenneth	Director	Grant	2K	$0.00	$0	15K
2026-05-01	Evans Sharlene	Director	Grant	2K	$0.00	$0	17K
2026-04-15	DiBella John Anthony II	Chief Revenue Officer	Sell	1K	$13.37	$13K	89K
2026-02-06	DiBella John Anthony II	Chief Revenue Officer	Option exercise	10K	$9.71	$100K	90K
2026-01-30	WOLTOSZ WALTER S	Director, 10% owner	Grant	2K	$0.00	$0	3.3M
2026-01-30	WEINER DANIEL L	Director	Grant	2K	$0.00	$0	14K
2026-01-30	Paglia John Kenneth	Director	Grant	2K	$0.00	$0	12K
2026-01-30	Evans Sharlene	Director	Grant	2K	$0.00	$0	15K
2026-01-28	Fiedler-Kelly Jill	President, Services Solutions	Option exercise	9K	$9.71	$87K	78K
2025-12-18	WOLTOSZ WALTER S	Director, 10% owner	Gift	9K	$0.00	$0	3.3M
2025-12-01	LaVange Lisa	Director	Sell	866	$16.91	$15K	10K
2025-11-03	WOLTOSZ WALTER S	Director, 10% owner	Grant	2K	$0.00	$0	3.3M
2025-11-03	WEINER DANIEL L	Director	Grant	2K	$0.00	$0	13K
2025-11-03	Paglia John Kenneth	Director	Grant	2K	$0.00	$0	11K
2025-11-03	LaVange Lisa	Director	Grant	2K	$0.00	$0	11K
2025-11-03	Evans Sharlene	Director	Grant	2K	$0.00	$0	13K
2025-10-01	WOLTOSZ VIRGINIA E	TenPercentOwner	Sell	20K	$15.39	$308K	3.3M
2025-10-01	WOLTOSZ WALTER S	Director, 10% owner	Sell	20K	$15.39	$308K	3.3M
2025-09-02	LaVange Lisa	Director	Sell	867	$14.10	$12K	9K
2025-08-01	WOLTOSZ VIRGINIA E	TenPercentOwner	Grant	2K	$0.00	$0	3.3M
2025-08-01	WOLTOSZ WALTER S	Director, 10% owner	Grant	2K	$0.00	$0	3.3M
2025-08-01	WEINER DANIEL L	Director	Grant	2K	$0.00	$0	11K
2025-08-01	Paglia John Kenneth	Director	Grant	2K	$0.00	$0	9K
2025-08-01	LaVange Lisa	Director	Sell	867	$12.93	$11K	10K
2025-08-01	LaVange Lisa	Director	Grant	2K	$0.00	$0	11K
2025-08-01	Evans Sharlene	Director	Grant	2K	$0.00	$0	12K
2025-07-01	WOLTOSZ WALTER S	Director, 10% owner	Sell	12K	$18.58	$227K	3.3M

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Planned sales (Form 144)

Newest first. JSON

10 Form 144 notices on file for SLP worth $1.1M at the prices reported; 1 in the last 90 days worth $55K. Latest: JOHN ANTHONY DIBELLA II filed on 2026-08-03 to sell 3,000 shares ($55K) from 2026-08-03.

Filed	Seller	Shares	Market value	Of outstanding	Sale from	Broker
2026-08-03	JOHN ANTHONY DIBELLA IIOfficer	3K	$55K	0.015%	2026-08-03	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-07-01	Walter S Woltosz & Virginia Evans WoltoszDirector, 10% Stockholder	4K	$76K	0.021%	2026-07-01	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-06-16	JILL FIEDLER-KELLYOfficer	5K	$86K	0.026%	2026-06-16	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-06-15	JILL FIEDLER-KELLYOfficer	3K	$51K	0.016%	2026-06-15	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-06-01	Walter S Woltosz & Virginia Evans WoltoszDirector, 10% Stockholder	15K	$257K	0.074%	2026-06-01	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-05-11	JILL FIEDLER-KELLYOfficer	1K	$17K	0.005%	2026-05-11	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-05-04	Walter S Woltosz & Virginia Evans WoltoszDirector, 10% Stockholder	15K	$224K	0.074%	2026-05-04	Morgan Stanley Smith Barney LLC Executive Financial Services
2026-04-15	JOHN ANTHONY DIBELLA IIOfficer	4K	$53K	0.020%	2026-04-15	Morgan Stanley Smith Barney LLC Executive Financial Services
2025-12-01	LISA LAVANGEDirector	866	$15K	0.004%	2025-12-01	Morgan Stanley Smith Barney LLC Executive Financial Services
2025-10-01	VIRGINIA EVANS WOLTOSZ & WALTER S WOLTOSZDirector, 10% Stockholder	20K	$301K	0.099%	2025-10-01	Morgan Stanley Smith Barney LLC Executive Financial Services

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

4 holders report 5% or more of SLP in their latest filing, all on Schedule 13G (passive). The largest reported stake is First Light Asset Management, LLC at 13.2% of the class (2,649,879 shares), filed 2026-02-06 for an event on 2026-01-31.

Filed	Form	Holder	Shares	Of class	Event
2026-08-06	13G	First Eagle Investment Management, LLCinvestment adviser	1.1M	5.3%	2026-06-30
2026-03-27	13G/Ano. 1	The Vanguard Groupinvestment adviser	0	0.0%	2026-03-13
2026-02-06	13G	First Light Asset Management, LLCinvestment adviser	2.6M	13.2%	2026-01-31
2026-02-06	13G	Mathew P. Arensindividual	2.6M	13.2%	2026-01-31
2025-10-02	13G/Ano. 5	BlackRock, Inc.parent holding company	1.2M	5.8%	2025-09-30

13F holders

Tracked managers holding SLP at their latest 13F. JSON

6 of the 30 tracked managers held SLP at their latest 13F, $17.4M in total at quarter-end prices. AQR Capital Management is the largest at $5.5M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 3 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
AQR Capital Management	2026-06-30	300K	$5.5M	0.00%	+141K
Renaissance Technologies	2026-06-30	185K	$3.4M	0.00%	+4K
D. E. Shaw & Co.	2026-06-30	183K	$3.4M	0.00%	-20K
Two Sigma Investments	2026-06-30	156K	$2.9M	0.00%	+53K
Citadel Advisors	2026-06-30	110K	$2.0M	0.00%	-81K
Millennium Management	2026-06-30	16K	$302K	0.00%	-28K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

Simulations Plus in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Simulations Plus (SLP), SEC CIK 1023459, listed on Nasdaq, classified by the SEC as services-computer integrated systems design. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest: FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-05.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-14.JSON and CSV
Planned sales: SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-08-03.JSON and CSV
Large holders: SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-06.JSON and CSV
13F holders: SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Earnings dates: SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-07-09.JSON and CSV
Insider trades: SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-06.JSON and CSV
Company record: EDGAR filing index for CIK 1023459Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits: 10 requests a minute without a key, 30 with a free key from a free account.

How to read it

Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as services-computer integrated systems design

Datasets

Frequently Asked Questions

How much of SLP is sold short?

2,879,422 shares were held short at the 2026-09-30 settlement, 15.2 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.

What is SLP's daily short volume?

On 2026-10-05, 47,208 of the 95,740 SLP shares reported to FINRA were sold short, 49.3% of the day's reported volume. Short volume is a flow for one day, not a position.

Does SLP have fails to deliver?

The SEC's latest file shows 211 SLP shares failed to deliver at settlement 2026-09-14. Fails are reported per settlement date and published twice a month with a lag.

Are SLP insiders buying or selling?

Insiders at SLP reported 1 open-market sell worth $18K in the last 90 days and no open-market buys. Latest filing: WEINER DANIEL L (Director) on 2026-10-06.

Have SLP insiders filed to sell?

Who owns 5% or more of SLP?

Which tracked 13F managers own SLP?

6 of the 30 tracked 13F managers held SLP shares at their latest filing, $17.4M in all. The largest: Cliff Asness's AQR Capital Management (300K shares, $5.5M), Renaissance Technologies (185K shares, $3.4M), D. E. Shaw & Co. (183K shares, $3.4M), Two Sigma Investments (156K shares, $2.9M), Ken Griffin's Citadel Advisors (110K shares, $2.0M), Izzy Englander's Millennium Management (16K shares, $302K).

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.