¶1The defendant was convicted by a Superior Court jury of assault by means of a dangerous weapon, a handgun, G. L. c. 265, § 15B(Z?); unlawful possession of a firearm, G. L. c. 269, § 10(a); trafficking in more than fourteen (but less than twenty-eight) grams of cocaine, G. L. c. 94C, § 32E(6)(1); and trafficking in cocaine within 1,000 feet of a school zone, G. L. c. 94C, § 32J. On appeal, the defendant contends that the trial judge committed prejudicial error by refusing to instruct the *207jury on the lesser included offense of simple joint possession with respect to the trafficking charges, and by denying his motion for a required finding of not guilty. We affirm the conviction of possession of a firearm,
¶21. Simple joint possession. Because the defendant objected to the trial judge’s denial of his request that the jury be instructed on the theory of simple joint possession, “we review the omission to determine if there was prejudicial error.” Commonwealth v. Henderson, 434 Mass. 155, 158 (2001), quoting from Commonwealth v. Robinson, 48 Mass. App. Ct. 329, 338 (1999).
¶3(a) Applicable principles. “[Wjhen the evidence permits a finding of a lesser included offense, a judge must, upon request, instruct the jury on the possibility of conviction of the lesser crime.” Commonwealth v. Roberts, 407 Mass. 731, 737 (1990), quoting from Commonwealth v. Hobbs, 385 Mass. 863, 871 (1982) (emphasis omitted). An instruction on simple joint possession is warranted when the evidence permits a finding that “two or more persons simultaneously and jointly acquire possession of a drug for their own use intending only to share it together.” Commonwealth v. Johnson, 413 Mass. 598, 604 (1992). See also United States v. Swiderski, 548 F.2d 445, 449 n.2 (2d Cir. 1977). Here, the evidence could have supported, as an alternative to trafficking in cocaine, the lesser crime of simple joint possession and, therefore, the jury should have been instructed regarding the possibility of conviction of the lesser crime.
¶4“In determining whether any view of the evidence would support a conviction on a lesser included offense, ‘all reasonable inferences must be resolved in favor of the defendant.’ ” Commonwealth v. Drewnowski, 44 Mass. App. Ct. 687, 693 (1998), quoting from Commonwealth v. Gilmore, 399 Mass. 741, 746 (1987).
¶5(b) The facts. The defendant testified at trial to the following. *208He and his friend of thirteen years, Morgan McBride, and McBride’s girlfriend, Anita Miller, decided to get together and go out for the weekend. Planning to hit the club circuit later on that evening, the group first went to McBride’s house so he could get cleaned up. The defendant and Miller smoked some marijuana as they waited for McBride to shower and change. When McBride joined them, he smoked some marijuana as well and, on learning that only a small amount remained, suggested that the group “get. . . some coke and stuff.” Miller said “she was down,” meaning she agreed with the suggestion. The three friends then added up the money they had between them. The defendant had two hundred dollars to contribute. Altogether, the three had a total of eight hundred and fifty dollars, which they pooled in order to “buy some cocaine for us, to last us for a few days.” McBride placed a call to a friend of his, Tim Horn, who was a middle man for drugs.
¶6The defendant testified that he and his friends traveled by car to an apartment where they met with Tim. Several other people were also present in the apartment, including Anthony Valez, identified by the defendant as the supplier of drugs, Sylvia Smith and others. The defendant stated that he, McBride and Miller all participated in the negotiation and were present during the exchange of money for drugs. Following introductions, McBride “started talking, you know, to Tim, Yo, Tim, you know. And Anthony’s, like, What’s up? So, we had told Anthony, we had already came up with what we wanted, and we told him we wanted about ... an ounce and a half of coke. . . . Anthony said, You got the money? . . . And we said, Yeah, we got the money. We showed him the money and then he said okay. He told Sylvia to go get the coke.” Ten minutes later, Sylvia returned and gave Anthony the cocaine, which he placed on the table to weigh. The defendant questioned why the cocaine was prepackaged, concerned that it would affect the weight. Sylvia said it was all they had left.
¶7Believing that the woman had taken some of the cocaine, the defendant and McBride followed her outside. There, a confrontation took place between the seller group, on the one hand, and the defendant and McBride, on the other, in which the woman was accused of taking the smaller bag of cocaine. When McBride brandished a handgun,
¶8(c) Discussion. This evidence — that the defendant and his two companions were friends who on occasion shared drugs; that the three had pooled their money to purchase drugs they intended to share; that they each participated in the negotiation for the purchase of drugs; and that all were present when the drugs were paid for and received — was, if believed, sufficient to support a finding that the drugs were simultaneously and jointly acquired and intended to be shared only by the three purchasers.
¶9The Commonwealth argues that a simple joint possession instruction was not warranted because the defendant held the money, paid for, and took possession of the drugs. The cases *210upon which the Commonwealth relies may be distinguished on grounds that, unlike here, the alleged joint possessors did not actively participate in the initial purchase of contraband. In Commonwealth v. Minor, 47 Mass. App. Ct. 928 (1999), for example, there was no evidence that anyone else was involved with the defendant in buying drugs. The defendant in Commonwealth v. Mitchell, 47 Mass. App. Ct. 178 (1999), was alone when he approached a car and negotiated with the driver for drugs. On being apprehended by police, he said he “was just trying to make some money for Christmas.” Id. at 182. In Commonwealth v. DePalma, 41 Mass. App. Ct. 798 (1996), we held that a “Johnson [simple joint possession] instruction is warranted only in those situations where the parties simultaneously and jointly acquire the controlled substance for their own use.” Id.at 804 & n.4 (emphasis original). In DePalma, the evidence that the defendant had purchased 1,000 grams of cocaine (an amount sufficient to warrant an inference beyond a reasonable doubt of intent to distribute) and had made statements to an undercover police officer about future purchases supported a reasonable inference that the defendant was in the business of trafficking in cocaine. An instruction that the jury could convict him of simple joint possession was not warranted where, in addition, the defendant purchased and took possession of drugs from the undercover police officer out of earshot of his joint venturer. Compare United States v. Swiderski, 548 F.2d at 448 (simple joint possession instruction required where defendant and his fiancée sampled cocaine offered by seller, defendant paid for and took possession of the drugs, and upon arrest shortly thereafter the drugs were found in fiancée’s purse). We conclude that it was error not to give the requested instruction.
¶102. Required finding on firearm charge. The defendant contends that the trial judge improperly denied his motion for a required finding of not guilty of unlawful possession of a firearm, made at the close of the Commonwealth’s case, because there was no direct evidence that the defendant possessed the handgun recovered by police from the vehicle after he had fled.
¶11Guilt was established under a theory of constructive possession, which requires proof that the defendant had “knowledge *211[of the weapon] coupled with the ability and intention to exercise dominion and control [over it].” Commonwealth v. Kitchings, 40 Mass. App. Ct. 591, 599 (1996), quoting from Commonwealth v. Deagle, 10 Mass. App. Ct. 563, 567-568 (1980).
¶12“We view the evidence at trial in the light most favorable to the Commonwealth, and determine ‘whether . . . any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.’ ” Commonwealth v. Grandi-son, 433 Mass. 135, 140 (2001), quoting from Commonwealth v. Lodge, 431 Mass. 461, 465 (2000) (emphasis original). Based on this view of the evidence, the jury could have found that during the confrontation outside the apartment where the drug sale took place, the defendant and McBride, both using handguns, assaulted the woman they believed had taken the drugs. They left the scene in a car driven by Miller
¶13We reverse the judgments of conviction for trafficking in cocaine and trafficking in cocaine within 1,000 feet of a school zone, and the verdicts are set aside. The remaining judgments are affirmed.
¶14So ordered.
¶15The defendant makes no claim of error with respect to his conviction for assault by means of a dangerous weapon.
¶16The jury were instructed as to the lesser included offense of simple possession.
¶17Overruling the prosecutor’s objections that the statements constituted hearsay, the judge instructed the jury that they could consider the defendant’s testimony as to what Sylvia Smith said solely in order to assist them in weighing the credibility of the witnesses.
¶18Although the Commonwealth’s witness testified that the defendant also brandished a gun, see part 2, infra, the defendant testified only that McBride “pulled out his pistol.”
¶19We therefore need not reach the argument that there was insufficient evidence to support conviction on the basis of joint venture possession, or concern ourselves with the fact that the jury were not instructed on this theory.
¶20There was no evidence as to ownership of the vehicle.