Timed out on an edit, so am putting the fixed one here, sorry for the extra scrolling involved. If a mod can delete the old one, that would be great!
Third the recommendation for the book, which has been renamed:
link
You can still get it under its original title if you feel like spending more money:
link
Like John and Gary said:
Dec 35: Rfl Plt (4 Sqd w/4 LMG) x3, MMG Plt (2 MMG)
Sep 39: Rfl Plt (4 Sqd w/4 LMG, Lt Mtr Sec w/1 tube) x3, MMG Plt (2 MMG)
Apr 41: Rfl Plt (4 Sqd w/4 LMG, Lt Mtr Sec w/1 tube) x3, MMG Plt (2 MMG)
Jul 41: Rfl Plt (4 Sqd w/2 LMG, Lt Mtr Sec w/1 tube) x3
Aug 41: Rfl Plt (4 Sqd w/2 LMG, Lt Mtr Sec w/1 tube) x2, Rfl Plt (4 Sqd w/2 LMG) x1
Oct 41: Rfl Plt (4 Sqd w/2 LMG) x3
Dec 41: Rfl Plt (4 Sqd w/3 LMG) x3
Mar 42: Rfl Plt (4 Sqd w/4 LMG) x3
Charles C. Sharp has these platoons as also having a light mortar section with one light mortar, so who knows.
Jul 42 (early): Rfl Plt (4 Sqd w/4 LMG) x3, Lt Mtr Plt (4 tubes)
Jul 42 (late): Rfl Plt (4 Sqd w/4 LMG) x3, Lt Mtr Plt (3 tubes)
Dec 42: Rfl Plt (4 Sqd w/6 LMG) x3, Lt Mtr Plt (2 tubes), MMG Sec (1 MMG)
Dec 42 Guards: Rfl Plt (4 Sqd w/6 LMG) x3, Lt Mtr Plt (2 tubes), MMG Plt (2 MMG)
Aug 43 (official reduced strength variant): Rfl Plt x3 (3 Sqd w/3 LMG), MMG Sec (1 MMG)
Dec 44: unclear, but probably like above according to a source I can't remember at the moment.
Charles C. Sharp has the 30 May 1944 company listed as:
1 x SMG Platoon (4 x Squad)
2 x Rifle Platoon (4 x Squad, each with one LMG)
1 x HMG Section (1 x HMG)
After referring to some fine-tuning of the official division organization made in October 1944, the Red Army Handbook 1939-1945 says that: "In addition, some further changes were made locally; an apparently popular one was to rearm one platoon in each rifle company entirely with sub-machine guns – in some cases such a platoon kept its DP light machine guns and in others they were dropped."
Charles C. Sharp has the February 1945 company as:
3 x Rifle Platoon (3 x Squad with one LMG per)
1 x HMG Section (1 x HMG)
Re: SMGs, this is as I understand it:
Oct 41 SMG Co: SMG Plt (3 Sqd) x3. The Sqd consisted of 10 men, all armed with SMGs. The company totaled 100 men in three 31 man platoons, and a 7 man HQ section. Everyone had an SMG and there were no other weapons (except I assume grenades, etc.).
And now the Mot Rifle Bn (in a Tank Bde) ones:
(By way of background, a Mot Rifle Bn in a Tank Bde from Nov 39 had 3 Rifle Companies, but in Dec 41 that was changed to 2 Rifle Companies and 1 SMG Company, this last unit being the Tankodesantniki).
Dec 41 SMG (Tankodesantniki) Co: SMG Plt (3 Sqd) x3. These are the tank-rider guys. They had a smaller Sqd (8 men), Plt (25 men), and HQ Sec (4 men) for a total of 79 men in the company, and were armed exclusively with SMGs.
(Again by way of background, in Nov 43 the 2 Rifle Companies in a Tank Bde's Mot Rifle Bn were converted to Motorized SMG Companies, while the 3rd (original) SMG company retained its unenviable task of clinging precariously to the T-34s as they rode into battle.)
Nov 43 SMG (Motorized) Co: SMG Plt (3 Sqd w/3 LMG) x3, MMG Plt (2 MMG). Note that these squads retained their LMGs and that the company retained its MMGs, as opposed to the pure SMG formations.
Nov 43 SMG (Tankodesantniki) Co: The overall size of the company is now 95 men according to a table, although no other specifics are given. Otherwise it appears to be the same as the Dec 41 version.
PS I was lazy and just did a copy and paste of stuff I had posted elsewhere in the past.