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More women than ever before are now chief executive officers at the Golden State’s largest 400 public companies, and fewer of these firms have no women in their C-suites and boardrooms, but an annual University of California, Davis, study shows women still hold just one in eight of the senior executive and director positions in corporate California.

Overall, women hold 12.3 percent of the highest-paid executive positions and board seats in the state’s 400 largest public companies — a scant 0.75 percentage point increase over last year, according to the .

The �ٺ���Ƶ Graduate School of Management has found very incremental gains during the 11 years it has tracked the representation of women in these key decision-making roles. The percentage of women in these key corporate leadership positions has inched up from 9.6 percent in 2010 to 12.3 percent in 2015, which represents 623 women in the 5,083 highest-paid executive and board positions at the 400 firms this year.

Some strides are being made in the corner office. The number of female CEOs rose from 14 to 17, a 21 percent increase over last year, and a 55 percent increase since 2006. But these 17 female CEOs still represent only 4.3 percent of the 400 CEO positions. Companies with women at the helm have, on average, 38 percent more female leaders than companies with a male CEO.

Together, the 400 companies represent nearly $5 trillion in stock market value; among them are global leaders in technology, health care, consumer products and pharmaceuticals.

“We know that a more representative, diverse group of leaders can change decision making and outcomes in companies,” said Ann Huff Stevens, dean of the management school. “California has been a leader in many areas, and these results point out the opportunity for California to take the lead in increasing women’s presence in corporate leadership.”

Among the 400 public companies, the top 25 firms identified in the study — those with the highest percentage of female executives and board members — have a median return on assets and return on equity that are at least 74 percent higher than for the 400 public companies in the study.

Only two companies — upscale kitchen and cookware retailer Williams-Sonoma of San Francisco and real estate trust LTC Properties of Westlake Village — have equal numbers of women and men in top executive positions and board seats. Only one company has appeared in the study’s top 25 list for 10 consecutive years: AMN Healthcare Services Inc. of San Diego.

At the bottom are 92 companies with no women among the highest-paid executives or board directors. These include brand names such as digital television pioneer TiVo Inc. in San Jose; Skechers U.S.A. Inc., a $2 billion global footwear maker headquartered in Manhattan Beach; and Palo Alto Networks, a leading international network security firm in San Jose that counts half of the Fortune Global 2000 companies as clients.

The study is the only one of its kind to focus on gender diversity in the boardrooms and executive suites of corporate California.

In September 2013, the California Legislature passed the first resolution in the United States calling for more women on corporate boards. The �ٺ���Ƶ study shows that only 17.5 percent, or 70 of the 400 largest public companies in California, have met the resolution’s nonbinding standards.

Among the findings in this year’s �ٺ���Ƶ study:

• Above the glass ceiling — With 57 percent top female leaders, Williams-Sonoma Inc. has the highest percentage since the study began. Including CEO Laura Alber, four of Williams-Sonoma’s five highest-paid executives are women, and the company has four women on its nine-person board. Eleven of the study’s top 25 firms have a female CEO.
• The glass ceiling intact — The number of companies with no women in director and highest-paid executive positions dropped to 92, a new low, below 100 for the first time. This is a 33 percent decrease since 2010, showing more women are being appointed to existing or new board seats and executive positions. The largest concentration of these 92 companies (30) are headquartered in Santa Clara County.
• Corporate boardrooms remain male dominated — Although still low overall, the percentage of women directors in California has risen steadily from 8.8 percent in 2006 to a high of 13.3 percent in 2015. Since 2006, when the study began tracking the largest 400 companies in California, the share of female directors has risen by 4.4 percentage points — incremental, but a 50 percent increase.
• While women hold 29 more board seats (432 of 3,260 total), the total number of board seats has increased by 20 since last year, diluting the growth in the percentage of seats held by women. Women do hold an increasing share of nominating, compensation and audit committee chair positions, all of which increased at least 5 percent from last year.
• A majority of the companies still have no women among their highest-paid executives. The percentage of women who are reported to be highest-paid executives has risen to 10.5 percent in 2015 from 7.8 percent in 2007, the first year those data were collected, for a 35 percent increase over that time.
• Where are the female directors? — Among counties with at least 20 companies, San Francisco County has the highest percentage of female board directors (20.2 percent), and Orange County has the lowest (10.5 percent), followed closely by Los Angeles County (11.6 percent) and Santa Clara County (12.7 percent). Regionally, the Bay Area (14.5 percent) leads Southern California (11.7 percent).
• Executives on location — Among counties with at least 20 companies, San Francisco County has the highest percentage of highest-paid women executives (15.1 percent), and across the bay, Alameda County (7.9 percent) has the lowest, followed closely by San Diego County (8.0 percent) and Santa Clara County (8.6 percent). Regionally, the Bay Area (10.9 percent) leads Southern California (9.6 percent).

The study tracks the members of the boards of directors and the five highest-paid executives for each company as reported to the Securities and Exchange Commission. The study examined filing data available as of Aug. 31, 2015. The 400 companies were selected based on highest market capitalization.

To publish the study, �ٺ���Ƶ partners with , a Bay Area-based nonprofit that is focused on increasing the representation of women in leadership roles.

“We’re pleased to see some movement forward but we want to see much more movement and at a much faster pace,” said Watermark CEO Marlene Williamson, who is also a veteran Silicon Valley technology executive. “This study is important in terms of tracking our success and determining what more we have to do to achieve gender equity in the top spots in corporate California. And from this study, we’ve created the Watermark Index, which looks specifically at how well Bay Area companies are doing in this regard. The �ٺ���Ƶ study, and now our Watermark Index, will continue to serve as important benchmarks as we go forward.”

Visit the �ٺ���Ƶ Graduate School of Management’s to see:

• Industry-by-industry statistics
• County-by-county statistics
• �ٺ���Ƶ database of the 400 companies and executive compensation
• Additional resources