Latest newsView all

Nippon Life bought Corebridge stock daily Sept. 9-30. The merger roughly halves its share.

Nippon Life spent $142.8 million on Corebridge stock from Sept. 9 to Sept. 30, by KeyVex's tally of its filings. Six months after the Equitable merger closes, its stake in the new company sets how many directors it may name.

KeyVex News··6 min readFact-checked against 26 public records
KeyVex News··6 min readFact-checked against 26 public records
CRBG$34.03▲ 1.1%Close, Oct. 2. Prices from Tiingo.
The short versionTap to readTap to close
  1. In an all-stock merger, both sides' holders get new shares, so a big holder's percentage shrinks. The merger proxy puts Nippon Life, Corebridge's largest holder, at about 13.9% of the new Equitable.
  2. Nippon's directly held Corebridge shares didn't change for almost two years after its 2024 purchase. Then it bought on every trading day from Sept. 9 to Sept. 30, under a prearranged plan.
  3. Each Corebridge share becomes one share of the new company, so that buying raises Nippon's stake in it. Buybacks by either company raise it too.
  4. For six months after closing, Nippon may name two directors; then its seats equal its stake times the board's size, rounded down. Its filings don't connect its purchases to those board rights.
  5. The purchase plan can run no later than Dec. 8, by KeyVex's reading of Nippon's filing. The companies expect to close by year-end, subject to regulators.

The buying: Nippon Life Insurance, the Japanese insurer that is Corebridge Financial's largest shareholder, bought Corebridge stock on all 16 trading days from Sept. 9 to Sept. 30, its Form 4 filings show.Form 4Form 4All 16 A Form 4 is the report a company's officers, directors and holders of more than 10% file on their trades.Investor.gov It paid about $142.8 million for 4.2 million shares. That took it to about 28% of Corebridge as of Sept. 30, by KeyVex's math.Form 410-Q

The merger: In March, Corebridge agreed to combine with Equitable Holdings in an all-stock deal, and both companies' shareholders approved it on July 30.Release8-K The combined company keeps the Equitable name and will be based in Houston, where Corebridge is.Release The merger proxy puts Nippon at about 13.9% of it. That figure does not count Nippon's purchases or any buybacks.Proxy

Why it matters: The merger turns the owner of more than a quarter of Corebridge into the owner of about 14% of a bigger company. Nippon had three representatives on Corebridge's board in March.Release After closing, it may name two directors for six months. Then its seats equal its stake times the size of the board, rounded down. The board is set at 14.Proxy

Corebridge's stock and Nippon Life's filingsDaily close, March 2 to Oct. 2, 2026 ▲ 31.0%Show chartHide chart
Corebridge's stock and Nippon Life's filingsDaily close as traded. Numbered dots mark the story's key dates, not what moved the stock. Story shows March 2 to Oct. 2, 2026; switch ranges, compare with the S&P 500, or show the filing markers from KeyVex's Corebridge page.
CRBG
Corebridge Financial Inc. · NYSE
Nasdaq 100S&P 500
Filings
Story90D1Y5Y
CRBGS&P 500 (rebased)1News in this story
Congress BuyCongress SellInsider BuyInsider SellForm 1448-KLobbying
Loading the chart…
Daily closes as traded · Close Prices from Tiingo.comColored dots are filings · White numbered dots are the news in this story · CRBG on KeyVex
  1. 1March 26, 2026 Corebridge and Equitable agree an all-stock merger. Each Corebridge share is to become one share of the combined company. Corebridge closes at $24.41.
  2. 2April 8, 2026 Nippon Life signs a voting agreement. It agrees to vote its Corebridge shares for the merger.
  3. 3July 30, 2026 Both companies' holders approve the merger. Corebridge's vote: 366,176,877 for, 119,470 against.
  4. 4Aug. 7, 2026 Nippon Life adopts a plan to buy up to 10.9 million shares. Its 13D amendment reports 27.4% of Corebridge.
  5. 5Sept. 9, 2026 Nippon Life's purchases begin. 136,466 shares, the first of 16 straight trading days.
  6. 6Sept. 30, 2026 The 16th day of purchases. 348,215 shares, bringing the total to 4,155,160. Corebridge closes at $33.12.
View the data (150 trading days)
DateCloseDay change
2026-10-02$34.03+1.1%
2026-10-01$33.66+1.6%
2026-09-30$33.12−1.9%
2026-09-29$33.770.0%
2026-09-28$33.78−3.1%
2026-09-25$34.87+2.3%
2026-09-24$34.09+0.6%
2026-09-23$33.89+0.1%
2026-09-22$33.84−2.8%
2026-09-21$34.800.0%
2026-09-18$34.81−0.2%
2026-09-17$34.88+0.1%
2026-09-16$34.85−0.5%
2026-09-15$35.02+0.6%
2026-09-14$34.80+0.4%
2026-09-11$34.67+1.4%
2026-09-10$34.18+1.1%
2026-09-09$33.82+0.2%
2026-09-08$33.75−2.1%
2026-09-04$34.47−0.8%
2026-09-03$34.75+3.6%
2026-09-02$33.54+4.3%
2026-09-01$32.17−1.1%
2026-08-31$32.54−0.2%
2026-08-28$32.61−0.1%
2026-08-27$32.63+0.3%
2026-08-26$32.53+2.2%
2026-08-25$31.83−0.4%
2026-08-24$31.960.0%
2026-08-21$31.95+0.4%
2026-08-20$31.81−2.3%
2026-08-19$32.57−1.7%
2026-08-18$33.12−0.2%
2026-08-17$33.18−3.7%
2026-08-14$34.47+0.5%
2026-08-13$34.30+1.5%
2026-08-12$33.78+1.2%
2026-08-11$33.39−3.2%
2026-08-10$34.49+2.4%
2026-08-07$33.68−1.0%
2026-08-06$34.01+1.3%
2026-08-05$33.59+6.3%
2026-08-04$31.60+0.9%
2026-08-03$31.31+0.4%
2026-07-31$31.19−2.4%
2026-07-30$31.96+0.7%
2026-07-29$31.75−1.7%
2026-07-28$32.31+1.8%
2026-07-27$31.73+1.4%
2026-07-24$31.29+1.5%
2026-07-23$30.84−2.7%
2026-07-22$31.68+0.4%
2026-07-21$31.54+1.0%
2026-07-20$31.24−2.0%
2026-07-17$31.88+0.1%
2026-07-16$31.84−0.1%
2026-07-15$31.87+3.9%
2026-07-14$30.68−0.5%
2026-07-13$30.82+0.9%
2026-07-10$30.55+0.8%
2026-07-09$30.30+1.5%
2026-07-08$29.85−2.5%
2026-07-07$30.61−0.6%
2026-07-06$30.81+3.5%
2026-07-02$29.76+3.5%
2026-07-01$28.74+0.4%
2026-06-30$28.63−0.7%
2026-06-29$28.84+0.8%
2026-06-26$28.61+1.7%
2026-06-25$28.14+0.6%
2026-06-24$27.98−3.2%
2026-06-23$28.91−0.6%
2026-06-22$29.09−0.3%
2026-06-18$29.18−0.5%
2026-06-17$29.34+0.4%
2026-06-16$29.21−0.8%
2026-06-15$29.46+2.5%
2026-06-12$28.74+1.9%
2026-06-11$28.20+3.8%
2026-06-10$27.18−1.5%
2026-06-09$27.59+1.7%
2026-06-08$27.13+1.0%
2026-06-05$26.86+1.7%
2026-06-04$26.42+1.8%
2026-06-03$25.95−4.1%
2026-06-02$27.05+1.8%
2026-06-01$26.57−1.6%
2026-05-29$27.00+1.5%
2026-05-28$26.59−1.2%
2026-05-27$26.92−1.6%
2026-05-26$27.37−1.3%
2026-05-22$27.74+0.3%
2026-05-21$27.65+0.5%
2026-05-20$27.52+3.1%
2026-05-19$26.70−3.1%
2026-05-18$27.560.0%
2026-05-15$27.56−0.4%
2026-05-14$27.66+4.6%
2026-05-13$26.44+1.3%
2026-05-12$26.09−0.9%
2026-05-11$26.34−3.6%
2026-05-08$27.31−0.5%
2026-05-07$27.45−2.1%
2026-05-06$28.05−1.4%
2026-05-05$28.46+5.1%
2026-05-04$27.07−1.6%
2026-05-01$27.52−0.1%
2026-04-30$27.54+2.2%
2026-04-29$26.95+0.1%
2026-04-28$26.93+0.9%
2026-04-27$26.70+1.6%
2026-04-24$26.28−1.0%
2026-04-23$26.54−0.3%
2026-04-22$26.62+1.3%
2026-04-21$26.28−2.2%
2026-04-20$26.86+0.4%
2026-04-17$26.75−0.3%
2026-04-16$26.830.0%
2026-04-15$26.82+4.9%
2026-04-14$25.57+2.5%
2026-04-13$24.94+2.0%
2026-04-10$24.45−1.4%
2026-04-09$24.79−0.4%
2026-04-08$24.90+3.3%
2026-04-07$24.11−1.7%
2026-04-06$24.52+2.1%
2026-04-02$24.01−0.5%
2026-04-01$24.13+1.1%
2026-03-31$23.86+5.0%
2026-03-30$22.73+1.9%
2026-03-27$22.30−8.6%
2026-03-26$24.41+1.0%
2026-03-25$24.17+2.9%
2026-03-24$23.48−1.0%
2026-03-23$23.71+2.3%
2026-03-20$23.18−0.8%
2026-03-19$23.36−2.2%
2026-03-18$23.89−1.2%
2026-03-17$24.19+2.2%
2026-03-16$23.66+0.7%
2026-03-13$23.49+2.9%
2026-03-12$22.83−2.8%
2026-03-11$23.48−4.6%
2026-03-10$24.62−2.5%
2026-03-09$25.25−0.4%
2026-03-06$25.35−3.2%
2026-03-05$26.18−1.0%
2026-03-04$26.45+5.4%
2026-03-03$25.10−3.4%
2026-03-02$25.97

Corebridge closed at $24.41 on March 26, when the merger was announced, and at $34.03 on Oct. 2. Source: Tiingo end-of-day closes, as traded, via KeyVex.

How a fifth became more than a quarter

Nippon Life bought its Corebridge stake from AIG. On Dec. 9, 2024, it paid about $3.8 billion for 122 million shares, or $31.47 each. That was 21.6% of Corebridge at the time.8-K13D

Nippon's filing then was a Schedule 13D, the form for holders of more than 5% who may seek to influence a company. It said Nippon wanted to expand its global business and had sought to invest in growing U.S. life insurance and retirement companies. It also said Nippon "may acquire additional securities" of Corebridge, or sell some or all of its shares. Its agreement with Corebridge bars it from going above 30% of the stock without the board's approval.13D8-K

For almost two years, the shares Nippon held directly stayed at 121,956,256, its August filing shows. Its stake still grew, to 27.4%, as Corebridge bought back its own stock.13D/A In the first half of 2026 alone, Corebridge repurchased about 52 million shares.10-Q

Nippon Life's stake in Corebridge, and the proxy's figure for the new EquitableShare of the company's common stock. The last column is of the combined company, as the merger proxy states it
View the data
As ofNippon Life's stakeNote
Dec. 9, 202421.6%121,956,256 shares bought from AIG; Corebridge 8-K
Aug. 7, 202627.4%Same shares held of record, plus 33,271 at a subsidiary; 13D amendment
Sept. 30, 202628.3%126,144,687 shares over 445,772,522 outstanding on July 31; KeyVex's math
At the merger13.9%Of the new Equitable, per the merger proxy, not counting buybacks or Nippon's purchases

The first three columns are shares of Corebridge; the last is of the combined company, before Nippon's purchases or any buybacks. Sept. 30 is KeyVex's math. Sources: Corebridge 8-K, Dec. 10, 2024; Nippon Life 13D amendment, Aug. 7, 2026; Form 4, Oct. 2, 2026; Corebridge 10-Q; merger proxy, June 23, 2026.

What the merger does to the stake

The deal swaps each Corebridge share for one share of the combined company, and Equitable's holders get shares too. Corebridge's holders end up with about 51% of the new company and Equitable's with about 49%.Release So Nippon's percentage roughly halves.Proxy

Nippon backed the deal from the start. Its three representatives on Corebridge's board voted for it. "Nippon expects to continue as a long-term strategic investor," its president, Satoshi Asahi, said in the March 26 announcement.Release On April 8 it agreed to vote its shares for the merger.Proxy

At closing, Nippon and the new Equitable sign a stockholder's agreement, the contract that sets Nippon's rights as a shareholder. Once the first six months are over, the proxy says, Nippon may name a number of directors, rounded down to a whole number,Proxy

DEFM14AThe New Nippon Life Stockholder's AgreementCorebridge Financial and Equitable Holdings · accepted June 23, 2026, 4:45 p.m. ET
equal to the product of the total number of directors multiplied by the share ownership percentage of Nippon Life
From the joint proxy statement/prospectus, describing the agreement Nippon Life and the new Equitable sign at closing. The highlight is KeyVex's.

That formula runs until Nippon's stake falls below 5%. Other rights end at other levels. It may inspect the company's books and records until it falls below 10%. Three Nippon employees may work at the new company for at least six months, and until its stake falls below 15%. The agreement also bars it from going above 30% without the board's approval.Proxy

On a 14-member board, the formula gives one seat for a stake from about 7.1% up to 14.29%, and two seats from 14.29%, which is 2 divided by 14.Proxy The board's size can change after closing. Nippon's filings don't connect its purchases to its board rights. In June, before any of this buying, the proxy's 13.9% figure already set aside "potential" share purchases by Nippon.Proxy

The plan behind the buying

On Aug. 7, Nippon told the SEC it had set up a trading plan with Goldman Sachs International to buy up to 10,900,682 more Corebridge shares. The SEC's Rule 10b5-1 gives a defense against insider-trading claims for trades made under a contract, instruction or written plan adopted when the trader had no material nonpublic information.SEC Purchases under this one could begin only after a cooling-off period and any needed regulatory approvals, the amendment says.13D/A The amendment adds no reason for the new buying; the 2024 statement of purpose still stands.13D/A Every one of the 16 Form 4s says its purchases were made under that plan.Form 4Form 4

The biggest day was Sept. 28, at 805,782 shares. Nippon paid an average of about $34.37 a share, compared with $31.47 in 2024.Form 4All 1613D Through Sept. 30 the plan had used 38% of its cap, leaving room for about 6.7 million more shares, by KeyVex's math.13D/A

Shares Nippon Life bought each trading day, Sept. 9 to Sept. 30Show chartHide chart
Shares Nippon Life bought each trading day, Sept. 9 to Sept. 30Open-market purchases of Corebridge common stock under its Aug. 7 trading plan, by trade date
View the data
Trade dateShares boughtNote
Sept. 9136,466 shares
Sept. 10176,300 shares
Sept. 11171,144 shares
Sept. 14295,967 shares
Sept. 15210,903 shares
Sept. 16320,785 shares
Sept. 17174,760 shares
Sept. 18131,333 shares
Sept. 21212,828 shares
Sept. 22296,868 shares
Sept. 23219,273 shares
Sept. 24258,878 shares
Sept. 25178,840 shares
Sept. 28805,782 shares
Sept. 29216,818 shares
Sept. 30348,215 shares

4,155,160 shares in all, for about $142.8 million at the weighted-average prices reported. Source: 16 Nippon Life Form 4 filings, Sept. 11 to Oct. 2, 2026.

What else moves the number

Buybacks raise Nippon's percentage too. On the March 26 call, Equitable finance chief Robin Raju said both companies would stay out of the market until the shareholder vote, and would look to buy back stock between the vote and the closing, according to a transcript filed with the SEC. Any planned buybacks not done by then would be done in one large repurchase at or shortly after closing, he said.Transcript

The merger still needs regulators. Corebridge chief executive Marc Costantini said on Sept. 9 that the companies were working through "four or five key states." Speaking at an investor conference held by the bank KBW, he spoke of Jan. 1 "when we hope to close," according to a transcript Corebridge filed.Transcript

Nippon's plan ends once it has bought 10,900,682 shares, 90 days after it took effect, or on other conditions, the 13D amendment says. By KeyVex's reading, those 90 days run out no later than Dec. 8.13D/A

The paper trail

Nippon Life's Corebridge filings and the merger filings this story cites, Dec. 10, 2024 through Oct. 2, 2026, with the time EDGAR accepted each one where it matters.

Filed (ET)FormFilerWhat it shows
Dec. 10, 20248-KCorebridgeNippon Life completes its purchase of 121,956,256 shares from AIG, 21.6%.
Dec. 13, 202413DNippon LifePrice of $31.4704 a share; 30% ceiling; it "may acquire additional securities."
March 26, 20268-K, Ex. 99.1EquitableJoint release: all-stock merger with Corebridge; 14-member board.
June 23, 4:45 p.m.DEFM14ACorebridgeJoint proxy: Nippon about 13.9% of the new company; its new stockholder's agreement.
July 30, 4:35 p.m.8-KCorebridgeShareholders of both companies approve the merger.
Aug. 7, 4:05 p.m.13D/ANippon Life27.4%; trading plan to buy up to 10,900,682 shares.
Sept. 9, 9:36 p.m.425CorebridgeKBW conference transcript; the CEO on regulators and a hoped-for Jan. 1 close.
Sept. 11, 4:15 p.m.4Nippon LifeFirst purchase under the plan: 136,466 shares on Sept. 9.
Sept. 304Nippon LifeThe largest day: 805,782 shares on Sept. 28.
Oct. 2, 4:30 p.m.4Nippon Life348,215 shares on Sept. 30; 126,144,687 owned after.

What to watch

  1. The latest the plan can run: 90 days after it took effect, which was no later than Sept. 9, the first purchase (KeyVex's reading of the 13D).

  2. The companies' target to close the merger, subject to regulators.

  3. Nippon's two board seats for the first six months give way to the stake-based formula.

Sources

30 sources, 26 of them public records

Public records

  1. Nippon Life Insurance Co., Schedule 13D Amendment No. 4 for Corebridge FinancialSEC EDGAR · Aug. 7, 2026
  2. Nippon Life Insurance Co., Schedule 13D for Corebridge FinancialSEC EDGAR · Dec. 13, 2024
  3. Form 4, Nippon Life Insurance Co. (Sept. 9 purchase)SEC EDGAR · Sept. 11, 2026
  4. Form 4, Nippon Life Insurance Co. (Sept. 10 purchase)SEC EDGAR · Sept. 14, 2026
  5. Form 4, Nippon Life Insurance Co. (Sept. 11 purchase)SEC EDGAR · Sept. 15, 2026
  6. Form 4, Nippon Life Insurance Co. (Sept. 14 purchase)SEC EDGAR · Sept. 16, 2026
  7. Form 4, Nippon Life Insurance Co. (Sept. 15 purchase)SEC EDGAR · Sept. 17, 2026
  8. Form 4, Nippon Life Insurance Co. (Sept. 16 purchase)SEC EDGAR · Sept. 18, 2026
  9. Form 4, Nippon Life Insurance Co. (Sept. 17 purchase)SEC EDGAR · Sept. 21, 2026
  10. Form 4, Nippon Life Insurance Co. (Sept. 18 purchase)SEC EDGAR · Sept. 22, 2026
  11. Form 4, Nippon Life Insurance Co. (Sept. 21 purchase)SEC EDGAR · Sept. 23, 2026
  12. Form 4, Nippon Life Insurance Co. (Sept. 22 purchase)SEC EDGAR · Sept. 24, 2026
  13. Form 4, Nippon Life Insurance Co. (Sept. 23 purchase)SEC EDGAR · Sept. 25, 2026
  14. Form 4, Nippon Life Insurance Co. (Sept. 24 purchase)SEC EDGAR · Sept. 28, 2026
  15. Form 4, Nippon Life Insurance Co. (Sept. 25 purchase)SEC EDGAR · Sept. 29, 2026
  16. Form 4, Nippon Life Insurance Co. (Sept. 28 purchase)SEC EDGAR · Sept. 30, 2026
  17. Form 4, Nippon Life Insurance Co. (Sept. 29 purchase)SEC EDGAR · Oct. 1, 2026
  18. Form 4, Nippon Life Insurance Co. (Sept. 30 purchase)SEC EDGAR · Oct. 2, 2026
  19. Corebridge Financial and Equitable Holdings, joint proxy statement/prospectus (DEFM14A)SEC EDGAR · June 23, 2026
  20. "Corebridge Financial and Equitable Holdings Announce Transformational Merger" (Exhibit 99.1)SEC EDGAR · March 26, 2026
  21. Corebridge Financial, Form 8-K: results of the special meetingSEC EDGAR · July 30, 2026
  22. Corebridge Financial, Form 8-K: AIG's agreement to sell shares to Nippon LifeSEC EDGAR · May 16, 2024
  23. Corebridge Financial, Form 8-K: Nippon Life completes its purchaseSEC EDGAR · Dec. 10, 2024
  24. Corebridge Financial, Form 10-Q for the quarter ended June 30, 2026SEC EDGAR · Aug. 5, 2026
  25. Transcript of the March 26, 2026 Corebridge and Equitable merger call (Form 425)SEC EDGAR · March 26, 2026
  26. KBW Insurance Conference transcript, Corebridge Financial, Sept. 9, 2026 (Form 425)SEC EDGAR · Sept. 10, 2026

Rules and references

  1. Rule 10b5-1: Insider Trading Arrangements and Related Disclosure (fact sheet)U.S. Securities and Exchange Commission · Dec. 2022
  2. Forms 3, 4 and 5 (glossary)Investor.gov, U.S. Securities and Exchange Commission · accessed Oct. 5, 2026

Data

  1. End-of-day prices for CRBG, and for SPY and QQQ on the chart (Tiingo)KeyVex · through Oct. 2, 2026
  2. The chart's Filings layer: KeyVex's Congress trade, insider trade, Form 144, 8-K and lobbying records for CRBGKeyVex · through Oct. 2, 2026

How we got these numbers

  • Prices are end-of-day closes as traded, not adjusted for dividends. The S&P 500 and Nasdaq 100 lines follow SPY and QQQ, rebased to Corebridge's close at the start of the range shown. The Filings switch shows the filing markers from KeyVex's Corebridge page, a selection of filings: not every filing, and not only those tied to this story.
  • Purchases: 18 lines on 16 Form 4s, 4,155,160 shares. Dollar totals are shares times the weighted-average price on each line: $142,809,046, an average of $34.37 a share. Nippon's holding after Sept. 30, 126,144,687 shares, includes 33,271 held by its subsidiary Nissay Asset Management.
  • Share of Corebridge: 126,144,687 shares over the 445,772,522 Corebridge reported outstanding on July 31, 2026 (28.3%). The full plan, 132,890,209 shares, would be 29.8% on that count. The 13D amendment's 27.4% uses 445,768,608 shares as of June 22.
  • Share of the new Equitable: the proxy's figure is about 13.9%, not counting buybacks or Nippon's purchases. KeyVex does not estimate the stake after the September purchases: the share counts of both companies have changed since the proxy's June 1 counts by more than the margin such an estimate would need, and buybacks at either company raise it.
  • Board seats: on 14 directors, two seats require 2/14, or 14.29%, under the formula, which applies only after the first six months. The board's size after closing may change. The filings do not say how the purchase plan's size was set.
  • The latest end date for the plan is KeyVex's reading: the 13D amendment says purchases begin on the plan's Effective Date and the plan ends no later than 90 days after it; the first purchase was Sept. 9, so the Effective Date was no later than that.

How KeyVex News works. Our stories are researched, drafted and checked with AI tools from public records. Every figure is checked against the filing it cites, and each story passes a final review before publication. Corrections are made in place and noted at the top of the story.

KeyVex News reports on public records. Nothing here is investment advice or a recommendation to buy or sell any security. Close prices from Tiingo.com.

The image shown with this story is AI-generated.

Read next

View all news