Chiasma OPTIMAL Top-line Results JULY 23, 2019 NASDAQ: CHMA Exhibit 99.2

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Acromegaly: A Rare and Debilitating Hormonal Disorder Caused by excessive secretion of growth hormone (GH) stemming from a benign pituitary tumor ~69,000* patients worldwide Features include enlarged hands, feet and internal organs, and altered facial features Significant comorbidities lead to premature death if untreated Patients not cured by surgery typically receive chronic somatostatin analog (SSA) injection therapy to suppress GH and IGF-1 Prior trials showed 51-67% IGF-1 response rate on injectable octreotide LAR** * Acromegaly Epidemiology abstracts and publications 1980-2016. **Sandostatin LAR prescribing information 2019 Cardiomegaly Headache Frontal bossing Increased perspiration Hypertension Enlarged hands (breadth) Nephromegaly Hepatomegaly Thyroid gland hypertrophy Prognathism (malocclusion) Coarse features Vision defect Supraorbital bulging Enlarged nose Enlarged tongue and lips Skin tags Galactorrhea Splenomegaly Polyps Enlarged colon Carpal tunnel syndrome Deformed sella turcica (pituitary adenoma) being developed as a much needed alternative in the treatment of acromegaly

Orphan, Addressable U.S. Acromegaly Market Opportunity 1.Endocrinology market studies. 2.Company estimates Sizing the Acromegaly Market Addressing the Market Cured through surgery Not treated with SSAs Chronically treated with SSA injections ~14,0001 ~8,0002 ~2,0002 # of U.S. Patients Diagnosed Acromegaly Patients ~24,0001 Fewer than 1,000 accounts manage ~90% of target acromegaly patients2 Pituitary Centers Regional Referral Centers High Volume Community Endocrinologists All Other Community Endocrinologists

Current Injection Therapies Carry Significant Treatment Burdens* Emotional Impact 36% feel loss of independence due to chronic injections Injection Site Reactions Hardness (48%), nodules (38%), swelling (28%), bruising (16%) and inflammation (7%) Lost Work Days 16% regularly miss work for injections (averages 11 days/year) Suboptimal Symptom Control 52% report symptoms worsen toward the end of the monthly dosing interval 32% controlled patients still complain about symptoms Pain 70% experienced pain during injection; half of these experienced continuing pain days later intramuscular Novartis’ Octreotide LAR: 19 or 20 Gauge Ipsen’s Lanreotide Depot: 18 or 19 Gauge deep subcutaneous cm Reference: insulin needle: 30 Gauge *Strasburger et al. Patient reported outcomes of parenteral somatostatin analogue injections in 195 patients with acromegaly. Eur J Endocrinol. 2016 Mar;174(3):355-62. An effective and painless oral therapy has the potential to disrupt the acromegaly market

CHIASMA OPTIMAL TRIAL* MET ITS ENDPOINTS Study met its primary endpoint and all secondary endpoints in acromegaly patients Positive top-line data brings us a step closer to advancing Mycapssa to registration with the FDA NDA resubmission planned by year end 2019 with an anticipated mid-2020 PDUFA date *This Special Protocol Assessment (SPA) agreed-upon Phase 3 clinical trial was designed to address FDA’s clinical concerns raised in the Complete Response Letter from April 2016

CHIASMA OPTIMAL – Study Design Open Label Extension Double-blind placebo-controlled (DPC) (36 weeks) Eligibility criteria: Average IGF-1 ≤ 1.0 ´ ULN Confirm active disease (IGF-1 ≥ 1.3 x ULN post last surgery) Pre-defined withdrawal criteria (both arms) IGF-1 ≥1.3 x ULN for 2 consecutive visits on the highest dose and exacerbation of clinical signs / symptoms Early terminated patients followed up to 36 weeks on injections, per protocol Baseline Placebo N=28 N=28 36 weeks 34 Last Injection Screening IGF-1s 2x IGF-1s 50% 50% Withdrawal Octreotide Capsules Versus Placebo Treatment In MultinationAL Centers Primary Endpoint Proportion of patients who maintain biochemical response (average of week 34 and 36 IGF-1 ≤ 1.0 x ULN)

Subject Disposition and Demographics 56 patients, 28 per group (octreotide capsules or placebo) 38% from the U.S. All patients completed trial No missing primary endpoint data Baseline characteristics well balanced between the groups

58% Maintained IGF-1 Response on Octreotide Capsules vs. 19% on Placebo (p = 0.008) Primary Endpoint: Proportion of patients who maintain biochemical response at end of 36 weeks p = 0.008

78% Maintained GH Response on Octreotide Capsules vs. 30% on Placebo (p = 0.001) 1st Secondary Endpoint: Proportion of patients who maintain GH response at week 36 (of GH responders at screening) p = 0.001

Median Time to Loss of Response Not Reached (>36 Weeks) for Patients on Octreotide Capsules (p < 0.001) Median time to loss of response Octreotide Capsules Placebo p Value 2nd Secondary Endpoint: IGF-1 >1.0×ULN Not reached 16 weeks < 0.001 3rd Secondary Endpoint: IGF-1 ≥1.3×ULN Not reached 16 weeks < 0.001

25% of Patients on Octreotide Capsules Began Rescue with SSA Injections vs. 68% on Placebo (p = 0.003) Confidential 4th Secondary Endpoint: Proportion of patients who began rescue treatment p = 0.003

90% Who Completed Trial with Octreotide Capsules Opted to Continue into the Open Label Extension 90% continued to OLE Patients completed 36-weeks on Mycapssa Patients elected to continue on Mycapssa

Octreotide Capsules Appeared Safe and Well Tolerated   Octreotide Capsules Placebo Subjects with: n % n % At least one TEAE 28 100% 27 96.4 Treatment-Related TEAE 18 64.3 15 53.6 SAEs 2 7.1 1 3.6 Treatment-Related SAEs 0 0.0 0 0.0 Severe TEAEs 3 10.7 7 25.0 TEAE Leading to Study Drug Discontinuation 2 7.1 1 3.6 TEAEs of Special Interest (acromegaly symptoms) 15 53.6 26 92.9 TEAE - Treatment-Emergent Adverse Events; SAEs – Serious Adverse Events; TEAEs of special interest: e.g. headache, perspiration, joint pain, fatigue, soft tissue swelling

CHMA Investment Highlights Rare and Orphan Disease Focus Registration-Ready Lead Asset Lead asset targeting adults with acromegaly Octreotide capsules (Mycapssa®), if approved, positioned to become the first oral somatostatin analog in an injectable-only market Positive top-line safety and efficacy results for CHIASMA OPTIMAL Phase 3 trial NDA submission planned by year end 2019 Ongoing EMA-accepted MPOWERED™ Phase 3 trial data anticipated in 2H 2020 Stable Financial Position Approximately $58.1 million of cash and investments as of June 30, 2019 Cash expected to be sufficient to fund operations into late 2020 Positive CHIASMA OPTIMAL data; NDA submission planned by year end 2019 Significant Market Opportunity SSAs in acromegaly represent approximately $0.8 billion annual global market opportunity Patent protection for Mycapssa through early 2036