Aug. 28 at 7:39 PM
$GRPN - Well here is the beginning of my DD.
Why the September Setup Favors the Bulls
I. Groupon closed Friday at
$19.48 with RSI at 17.7, sitting directly on the gamma flip line at
$19 and testing the
$18.85 August low support. The technical map is clean. The floor breakdown level is
$17.25, which is the 150-day moving average and the current put wall, a hard structural support where dealer hedging flips from selling into strength to buying into weakness. The immediate gamma wall sits at
$22.83, right where the 20-day moving average and prior consolidation converge, and above that the real fight begins. The 12.68M shares of short interest against a functional float of just 20M shares is not a wash. It is a coiled spring that has been compressing for months while institutions like Divisadero (+314.8%), Millennium (+346.7%), and Wolf Hill (new 1M share stake) have been accumulating aggressively per Track13F filings. The stock is now oversold into structural support with the highest conviction long holders in the name still buying.
II. Contrary to how most traders read a gamma wall, the
$22.83 level is not resistance in the traditional sense. It is a dealer hedging inflection point. Above
$22.83, options market makers who wrote calls at
$25,
$27,
$30, and
$35 must aggressively buy stock to hedge their negative delta exposure. Per OptiView, the September call open interest is stacked heavily at the
$25 and
$30 strikes, which means every dollar the stock advances above
$23 forces incremental mechanical buying, not selling. The
$22.83 wall is the entry to the squeeze zone, not a ceiling. Once GRPN breaks
$24.80 with volume, MMs move into full gamma chase mode, and the 2027 convertible at
$30 strike (only 1.54M underlying shares to hedge) becomes the only structural arb-based ceiling until well into the
$30S. That is a paper-thin ceiling against 5.5 to 6.5M directional shorts who cannot smooth adjust their positions.
III. September's reputation as the worst month for stocks is well earned. The S&P 500 has averaged 1.2% declines in September since 1928 and finished green only 44% of the time, per Dow Jones Market Data. But that broad market weakness is exactly the environment where short squeezes disproportionately thrive. Per S3 Partners' historical data,
$28 billion of Q3 2022 short covering happened in September alone, which was 46% of the entire quarter's covering, because directional shorts get squeezed as the market's broad decline forces margin calls that hit their over leveraged books. When 91.4% of industries see net buy to covers in a single September, as they did in 2022, that is not weakness. That is a mechanical short cover cascade. Highly shorted small caps with strong fundamentals become the hiding places fund managers rotate into when broad indexes get hit, precisely because they carry the coiled spring optionality that outperforms a red tape.
IV. While shorts sweat the borrow fee and MMs pin the tape, Groupon's board has
$213.6M remaining in the current buyback authorization and has already retired 3.7M shares in the first half of 2026 per the Q1 earnings transcript. That is roughly
$5 to
$10M of open market buying every month, and the company has explicit permission to execute Rule 10b5-1 trading plans during blackout periods. At
$19.48, that authorization retires stock at an accelerated pace, roughly 250,000 shares a month at current volume, which quietly reduces float from underneath the shorts. Every share the company buys and destroys is a share the shorts cannot borrow to cover later. Combined with institutional accumulation pulling lendable inventory out of prime brokerage lending pools, September's typical borrow fee expansion (from today's 1.6% per Tapeboard to potentially 5% or higher if compression continues) becomes the trigger that finally forces the reactive shorts to abandon their positions.
V. The base case is that GRPN holds
$18.85 support this week, retests the
$17.25 floor only on a broad market washout, and grinds toward
$22.83 into September options expiration on the 18th. The bull case is that a breach of
$24.80 with volume triggers the mechanical MM gamma chase, opening a runway to
$27 to
$30 within two weeks. The parabolic case is that if the FINRA short interest report on September 15th shows short interest holding above 12M shares despite the recent rally attempt, combined with borrow fees pushing above 5%, the reactive shorts capitulate and
$32 to
$38 becomes the destination on a single 3-to-5-day squeeze burst. Monte Carlo modeling over the next 45 trading days (through the November Q3 print) shows a 55% probability of touching
$23.75, a 36.6% probability of touching
$27, a 25% probability of touching
$30, and a 13% probability of touching
$35, all with realized volatility of 86% and IV of 128% providing the fuel. The asymmetry is real. The average outcome is +2.4%, but the 95th percentile outcome is +94.9%. September is not the month to hide from GRPN. It is the month to own it, because that is precisely when the mechanical forces holding it in this
$19 to
$22 pin regime have historically broken down. Buy the dip, respect
$17.25 as your invalidation line, and let the structure do its work.
VI. The institutional flow tells the whole story. Per Wall St. Rank's Q2 2026 fund activity tracker, the five largest GRPN buyers of the quarter were Divisadero Street Capital Management (+
$23.1M, position now 1.85M shares at
$44.4M per Track13F), Wolf Hill Capital Management (+
$16.5M, new 1M share stake), Millennium Management (+
$12.1M, up 346.7% to 947K shares), Mason Capital Management (+
$10.8M new position), and Discovery Capital Management (+
$8.11M new position). Layer on Bank of America (+552.5% Q2 add per MarketBeat), Dimensional Fund Advisors (increased Q2 stake), Renaissance Technologies (grew position per MarketBeat), Versant Capital (+92.7%), Connor Clark & Lunn (+229.7%), and Continental General Insurance (+23.6% add to 3.62M shares per Simply Wall St) that is roughly
$85 to
$95M of net institutional buying pressure deployed into GRPN during a single quarter when the stock traded between
$17 and
$37. On the sell side, the notable trims were BlackRock (down 11% to 2.22M shares) and Vanguard Capital Management (down 9.4% to 1.02M shares), plus Continental General reducing on the Track13F view by 31.5% but those are largely index-rebalance flows, not conviction sells, and the aggregate sold volume was materially smaller than the aggregate bought volume. Net-net, at least ten identifiable institutions added meaningful capital in Q2 while only two mechanical index holders trimmed and Pale Fire Capital SE, the 25% activist anchor, held its 10.18M shares completely unchanged per its Q2 13F filing. That is not a market where the smart money is exiting. That is a market where the smart money is quietly building conviction ahead of what they believe is coming next.
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