California Water Service Group (CWT)

California Water Service Group on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on NYSE, classified by the SEC as water supply.

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2.5M

Short interest

settlement 2026-09-30

5.7

Days to cover

+1.4 days vs prior

50.8%

Short share of volume

2026-10-09

377

Fails to deliver

settlement 2026-09-14

Thu 29 Oct

Next earnings

estimated date

-$211K

Insider flow, 90 days

0 buys, 2 sells

As of 2026-10-09.

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 CWT is 2,484,062 shares, up 54,788 shares over the last month. Over the last 48 readings it ranged from 407,905 shares (31 October 2024) to 2,484,062 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 440K shares a day that is 5.7 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	2,484,062	+2.9%	439,848	5.65
2026-09-15	2,415,232	-0.6%	563,490	4.29
2026-08-31	2,429,274	+70.4%	468,427	5.19
2026-08-14	1,425,414	-20.2%	452,841	3.15
2026-07-31	1,787,198	-13.5%	516,097	3.46
2026-07-15	2,065,904	+3.4%	416,337	4.96
2026-06-30	1,998,391	+10.6%	715,732	2.79
2026-06-15	1,806,882	-4.1%	546,213	3.31
2026-05-29	1,884,183	+14.2%	570,251	3.30
2026-05-15	1,649,522	+13.9%	438,850	3.76
2026-04-30	1,448,250	+2.4%	798,994	1.81
2026-04-15	1,413,803	+12.0%	384,620	3.68
2026-03-31	1,262,591	-8.7%	504,206	2.50
2026-03-13	1,383,489	+9.7%	447,335	3.09
2026-02-27	1,261,100	+24.2%	404,230	3.12
2026-02-13	1,015,049	+1.6%	346,178	2.93
2026-01-30	999,189	-6.0%	383,787	2.60
2026-01-15	1,062,784	+10.8%	309,450	3.43
2025-12-31	959,185	-19.2%	374,214	2.56
2025-12-15	1,186,602	-19.1%	559,446	2.12
2025-11-28	1,466,795	+19.3%	356,877	4.11
2025-11-14	1,229,749	+7.1%	427,385	2.88
2025-10-31	1,148,623	+39.6%	449,850	2.55
2025-10-15	822,603	-6.4%	350,706	2.35

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of CWT volume is 50.8%, down 2.9 points over the last five sessions. Over the last 30 readings it ranged from 20.7% (6 October 2026) to 82.7% (2 September 2026). The latest reading is in line with the 30-session average of 48.9%, on 98K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-09	50K	98K	50.8%	0
2026-10-08	60K	107K	56.5%	551
2026-10-07	41K	110K	37.1%	0
2026-10-06	40K	192K	20.7%	304
2026-10-05	71K	121K	58.1%	3
2026-10-02	69K	129K	53.7%	431
2026-10-01	41K	146K	27.8%	0
2026-09-30	87K	142K	60.8%	3,145
2026-09-29	52K	104K	50.4%	4
2026-09-28	49K	103K	47.1%	0
2026-09-25	37K	88K	41.9%	0
2026-09-24	76K	163K	46.9%	50
2026-09-23	54K	140K	38.1%	0
2026-09-22	43K	106K	40.6%	4,742
2026-09-21	44K	91K	48.9%	9
2026-09-18	40K	74K	53.2%	195
2026-09-17	51K	115K	44.0%	0
2026-09-16	31K	67K	46.0%	469
2026-09-15	50K	96K	51.9%	100
2026-09-14	52K	107K	48.9%	0
2026-09-11	54K	107K	50.3%	234
2026-09-10	67K	125K	53.7%	6
2026-09-09	82K	119K	68.4%	170
2026-09-08	52K	120K	43.8%	0
2026-09-04	138K	229K	60.0%	13
2026-09-03	141K	243K	58.1%	2,000
2026-09-02	516K	625K	82.7%	663
2026-09-01	70K	180K	38.8%	200
2026-08-31	51K	114K	44.5%	0
2026-08-28	60K	133K	44.6%	523

Fails to deliver

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

As of 14 September 2026, the fails-to-deliver balance in CWT is 377 shares, up 371 shares over the last settlement date. Over the last 30 readings it ranged from 2 shares (10 March 2026) to 38,590 shares (23 March 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-09-14	377	$48.22	$18K
2026-08-31	6	$50.48	$303
2026-08-25	84	$50.85	$4K
2026-07-14	230	$50.00	$12K
2026-07-08	121	$49.69	$6K
2026-06-18	2	$45.00	$90
2026-06-17	8,500	$45.45	$386K
2026-06-16	14,153	$45.37	$642K
2026-06-12	16	$45.35	$726
2026-06-04	47	$44.75	$2K
2026-06-02	1,044	$43.86	$46K
2026-05-19	43	$42.82	$2K
2026-05-18	222	$42.47	$9K
2026-05-15	4,510	$43.45	$196K
2026-05-07	904	$43.03	$39K
2026-04-17	40	$44.81	$2K
2026-04-02	5	$45.51	$228
2026-03-31	48	$46.05	$2K
2026-03-23	38,590	$43.91	$1.7M
2026-03-20	10,922	$44.24	$483K
2026-03-13	15,371	$44.37	$682K
2026-03-12	6,903	$44.06	$304K
2026-03-10	2	$45.68	$91
2026-02-20	1,611	$46.20	$74K
2026-02-13	929	$45.45	$42K
2026-02-05	174	$44.94	$8K
2026-02-02	580	$44.70	$26K
2026-01-08	23	$43.24	$995
2026-01-05	7	$42.95	$301
2025-12-09	1,499	$43.60	$65K

Insider trades

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

Insiders at CWT reported 2 open-market sells worth $211K in the last 90 days and no open-market buys. Latest filing: James Sophie Marwieh (VP Water Qual) on 2026-09-05.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-09-05	James Sophie Marwieh	VP Water Qual	Tax withholding	50	$50.03	$3K	8K
2026-09-05	Jenkins Kenneth G	VP Water Res Plan & Sustain	Tax withholding	38	$50.03	$2K	5K
2026-09-05	Peters Todd Kenneth	Vice President, Engineering	Tax withholding	40	$50.03	$2K	8K
2026-09-05	Scanlon Thomas A	VP, Corporate Controller & PAO	Tax withholding	30	$50.03	$2K	6K
2026-09-05	Mares Michael S JR	SVP Operations	Tax withholding	67	$50.03	$3K	8K
2026-09-05	Ouyang Elissa Y	VP Facilities Fleet Procure IT	Tax withholding	66	$50.03	$3K	15K
2026-09-05	Dean Shannon C	SVP, Cust Svc & Chief Sust Of	Tax withholding	72	$50.03	$4K	24K
2026-09-05	Mortensen Michelle R	VP Corp Sect, Gov & Assurance	Tax withholding	73	$50.03	$4K	13K
2026-09-05	Luu Michael B	SVP Corp Svce & Chief Risk Of	Tax withholding	68	$50.03	$3K	24K
2026-09-05	Lynch James Patrick	SVP CFO and Treasurer	Tax withholding	48	$50.03	$2K	6K
2026-09-05	KROPELNICKI MARTIN A	Chairman President & CEO	Tax withholding	493	$50.03	$25K	147K
2026-09-05	Bunting Shawn C	SVP, Chief Legal Officer & BD	Tax withholding	69	$50.03	$3K	5K
2026-09-04	HAMNER KRISTAN A	VP, Chief Human Resource Offcr	Tax withholding	42	$50.03	$2K	3K
2026-09-04	James Sophie Marwieh	VP Water Qual	Tax withholding	51	$50.03	$3K	8K
2026-09-04	Jenkins Kenneth G	VP Water Res Plan & Sustain	Tax withholding	64	$50.03	$3K	5K
2026-09-04	Peters Todd Kenneth	Vice President, Engineering	Tax withholding	41	$50.03	$2K	8K
2026-09-04	Scanlon Thomas A	VP, Corporate Controller & PAO	Tax withholding	30	$50.03	$2K	6K
2026-09-04	Mares Michael S JR	SVP Operations	Tax withholding	69	$50.03	$3K	8K
2026-09-04	Ouyang Elissa Y	VP Facilities Fleet Procure IT	Tax withholding	68	$50.03	$3K	15K
2026-09-04	Dean Shannon C	SVP, Cust Svc & Chief Sust Of	Tax withholding	75	$50.03	$4K	24K
2026-09-04	Mortensen Michelle R	VP Corp Sect, Gov & Assurance	Tax withholding	75	$50.03	$4K	13K
2026-09-04	Luu Michael B	SVP Corp Svce & Chief Risk Of	Tax withholding	70	$50.03	$4K	24K
2026-09-04	Lynch James Patrick	SVP CFO and Treasurer	Tax withholding	50	$50.03	$3K	7K
2026-09-04	KROPELNICKI MARTIN A	Chairman President & CEO	Tax withholding	505	$50.03	$25K	148K
2026-09-04	Bunting Shawn C	SVP, Chief Legal Officer & BD	Tax withholding	71	$50.03	$4K	5K
2026-09-01	Snow Lester A	Director	Sell	500	$50.21	$25K	18K
2026-08-13	Krummel Thomas M	Director	Sell	4K	$50.37	$186K	20K
2026-08-04	Shimansky Gregory Dale	VP, Rates & Reg Affairs	Grant	446	$0.00	$0	1K
2026-06-05	James Sophie Marwieh	VP Water Qual	Tax withholding	50	$45.82	$2K	8K
2026-06-05	Jenkins Kenneth G	VP Water Res Plan & Sustain	Tax withholding	38	$45.82	$2K	5K
2026-06-05	Peters Todd Kenneth	Vice President, Engineering	Tax withholding	40	$45.82	$2K	8K
2026-06-05	Scanlon Thomas A	VP, Corporate Controller & PAO	Tax withholding	30	$45.82	$1K	6K
2026-06-05	Mares Michael S JR	SVP Operations	Tax withholding	68	$45.82	$3K	8K
2026-06-05	Milleman Greg A	VP Rates & Regulatory Affairs	Tax withholding	66	$45.82	$3K	14K
2026-06-05	Ouyang Elissa Y	VP Facilities Fleet Procure IT	Tax withholding	66	$45.82	$3K	15K
2026-06-05	Dean Shannon C	SR. VP, Cust Svc & Chief Sust	Tax withholding	73	$45.82	$3K	24K
2026-06-05	Mortensen Michelle R	VP Corp Sect, Gov & Assurance	Tax withholding	73	$45.82	$3K	13K
2026-06-05	Luu Michael B	SVP Corp Svce & Chief Risk Of	Tax withholding	69	$45.82	$3K	24K
2026-06-05	Lynch James Patrick	SVP CFO and Treasurer	Tax withholding	49	$45.82	$2K	7K
2026-06-05	KROPELNICKI MARTIN A	Chairman President & CEO	Tax withholding	493	$45.82	$23K	148K
2026-06-05	Bunting Shawn C	Sr. VP, GC and Business Dev	Tax withholding	69	$45.82	$3K	5K
2026-06-04	HAMNER KRISTAN A	VP, Chief Human Resource Offcr	Tax withholding	41	$45.24	$2K	3K
2026-06-04	James Sophie Marwieh	VP Water Qual	Tax withholding	51	$45.24	$2K	8K
2026-06-04	Jenkins Kenneth G	VP Water Res Plan & Sustain	Tax withholding	63	$45.24	$3K	5K
2026-06-04	Peters Todd Kenneth	Vice President, Engineering	Tax withholding	40	$45.24	$2K	8K
2026-06-04	Scanlon Thomas A	VP, Corporate Controller & PAO	Tax withholding	30	$45.24	$1K	6K
2026-06-04	Mares Michael S JR	SVP Operations	Tax withholding	69	$45.24	$3K	8K
2026-06-04	Milleman Greg A	VP Rates & Regulatory Affairs	Tax withholding	67	$45.24	$3K	14K
2026-06-04	Ouyang Elissa Y	VP Facilities Fleet Procure IT	Tax withholding	67	$45.24	$3K	15K
2026-06-04	Dean Shannon C	SR. VP, Cust Svc & Chief Sust	Tax withholding	74	$45.24	$3K	24K

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

3 Form 144 notices on file for CWT worth $517K at the prices reported; 1 in the last 90 days worth $185K. Latest: Krummel Thomas M filed on 2026-08-13 to sell 3,700 shares ($185K) from 2026-08-13.

Filed	Seller	Shares	Market value	Of outstanding	Sale from	Broker
2026-08-13	Krummel Thomas MDirector	4K	$185K	0.006%	2026-08-13	Charles Schwab & Co., Inc.
2026-05-21	Krummel Thomas MDirector	4K	$160K	0.006%	2026-05-21	Charles Schwab Corporation
2026-03-20	MICHAEL MARESOfficer	4K	$171K	0.007%	2026-03-20	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 CWT in their latest filing, all on Schedule 13G (passive). The largest reported stake is Vanguard Portfolio Management at 7.2% of the class (4,312,668 shares), filed 2026-04-29 for an event on 2026-03-31.

Filed	Form	Holder	Shares	Of class	Event
2026-07-22	13G/Ano. 1	AMUNDIparent holding company	3.5M	5.8%	2026-06-30
2026-07-22	13G/Ano. 1	AMUNDI ASSET MANAGEMENTparent holding company	3.5M	5.8%	2026-06-30
2026-04-29	13G	Vanguard Portfolio Managementinvestment adviser	4.3M	7.2%	2026-03-31
2026-04-29	13G	Vanguard Capital Managementinvestment adviser	3.2M	5.3%	2026-03-31
2026-03-26	13G/Ano. 13	The Vanguard Groupinvestment adviser	0	0.0%	2026-03-13

13F holders

Tracked managers holding CWT at their latest 13F. JSON

6 of the 30 tracked managers held CWT at their latest 13F, $64.9M in total at quarter-end prices. AQR Capital Management is the largest at $33.2M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 1 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
AQR Capital Management	2026-06-30	682K	$33.2M	0.01%	+512K
Citadel Advisors	2026-06-30	196K	$9.6M	0.00%	+162K
D. E. Shaw & Co.	2026-06-30	193K	$9.4M	0.00%	+110K
Renaissance Technologies	2026-06-30	144K	$7.0M	0.01%	+44K
Millennium Management	2026-06-30	110K	$5.4M	0.00%	+49K
Two Sigma Investments	2026-06-30	9K	$419K	0.00%	-68K

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.

Financials

SEC XBRL, as filed. JSON

In Q2 FY 2026 (quarter ended 2026-06-30) California Water Service Group reported revenue of $278.0M, up 8.5% from the same quarter a year earlier, and net income of $56.5M (0.93 diluted EPS). In FY 2025 it generated $302.6M of operating cash flow and spent $1.4M on buybacks and $73.9M on dividends.

Cash: $43.4M
Total assets: $5.95B
Shares outstanding: 61,839,101

Quarterly, last 8 quarters

Quarter	Period end	Revenue	Net income	Margin	Diluted EPS
Q2 FY 2026	2026-06-30	$278.0M	$56.5M	20.3%	0.93
Q1 FY 2026	2026-03-31	$197.3M	$4.0M	2.0%	0.07
Q4 FY 2025derived	2025-12-31	$210.7M	$11.5M	5.4%	n/a
Q3 FY 2025	2025-09-30	$314.1M	$61.2M	19.5%	1.03
Q2 FY 2025	2025-06-30	$256.2M	$42.2M	16.5%	0.71
Q1 FY 2025	2025-03-31	$182.7M	$13.3M	7.3%	0.22
Q4 FY 2024derived	2024-12-31	$217.8M	$19.7M	9.0%	n/a
Q3 FY 2024	2024-09-30	$306.2M	$60.7M	19.8%	1.03

Fiscal years, with buybacks and dividends

Fiscal year	Ends	Revenue	Net income	Operating cash flow	Capex	Buybacks	Dividends
FY 2025	2025-12-31	$963.7M	$128.2M	$302.6M	n/a	$1.4M	$73.9M
FY 2024	2024-12-31	$905.6M	$190.8M	$290.9M	n/a	$1.4M	$65.5M
FY 2023	2023-12-31	$790.3M	$51.9M	$217.8M	n/a	$1.8M	$59.0M
FY 2022	2022-12-31	$772.6M	$96.0M	$243.8M	n/a	$2.0M	$54.2M
FY 2021	2021-12-31	$765.7M	$101.1M	$231.7M	n/a	$1.8M	$47.4M

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-20 from the cover page.

What this page is

California Water Service Group 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 California Water Service Group (CWT), SEC CIK 1035201, listed on NYSE, classified by the SEC as water supply. 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 2026-10-09.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 2026-08-13.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 2026-07-22.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
Financials: SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. 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 2026-07-30.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 2026-09-05.JSON and CSV
Company record: EDGAR filing index for CIK 1035201Ticker, 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 water supply

Other company pages

Datasets

Frequently Asked Questions

How much of CWT is sold short?

2,484,062 shares were held short at the 2026-09-30 settlement, 5.7 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 CWT's daily short volume?

On 2026-10-09, 49,694 of the 97,773 CWT shares reported to FINRA were sold short, 50.8% of the day's reported volume. Short volume is a flow for one day, not a position.

Does CWT have fails to deliver?

The SEC's latest file shows 377 CWT shares failed to deliver at settlement 2026-09-14. Fails are reported per settlement date and published twice a month with a lag.

Are CWT insiders buying or selling?

Insiders at CWT reported 2 open-market sells worth $211K in the last 90 days and no open-market buys. Latest filing: James Sophie Marwieh (VP Water Qual) on 2026-09-05.

Have CWT insiders filed to sell?

3 Form 144 notices on file for CWT worth $517K at the prices reported; 1 in the last 90 days worth $185K. Latest: Krummel Thomas M filed on 2026-08-13 to sell 3,700 shares ($185K) from 2026-08-13.

Who owns 5% or more of CWT?

What did CWT report last quarter?

Which tracked 13F managers own CWT?

6 of the 30 tracked 13F managers held CWT shares at their latest filing, $64.9M in all. The largest: Cliff Asness's AQR Capital Management (682K shares, $33.2M), Ken Griffin's Citadel Advisors (196K shares, $9.6M), D. E. Shaw & Co. (193K shares, $9.4M), Renaissance Technologies (144K shares, $7.0M), Izzy Englander's Millennium Management (110K shares, $5.4M), Two Sigma Investments (9K shares, $419K).

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