The single discrete question with which this appeal deals is whether appellee, Mas*755sachusetts Financial Services, Inc. (“MFS”), is a member of the federally created Securities Investor Protection Corp. (“SIPC”).1 The district court answered this question in the negative and held that MFS was not liable for the $5,368 which it had paid to SIPC as a mandatory assessment for the calendar years 1972 and 1973. 411 F.Supp. 411 (1976). We affirm.

The crucial statute in this case is 13(a)(2) of the Securities Investor Protection Act of 1970 (“SIPA”), 15 U.S.C. § 78ccc(a)(2), which provides that SIPC shall:

“be a membership corporation the members of which shall be—

(A) all persons registered as brokers or dealers under section 78o(b) of this title [the Securities Exchange Act of 1934], and

(B) all persons who are members of a national securities exchange,

other than persons whose business as a broker or dealer consists exclusively of (i) the distribution of shares of registered open end investment companies or unit investment trusts, (ii) the sale of variable annuities, (iii) the business of insurance, or (iv) the business of rendering investment advisory services to one or more registered investment companies or insurance company separate accounts . .” (Emphasis added.)2

MFS contends that § 78ccc(a)(2) specifically exempts it from membership in SIPC because the only business which it conducts as a broker or dealer is the marketing (distribution) of the shares of its mutual fund customers. The Sales Division of MFS markets the shares of the firm’s mutual fund customers, while other MFS divisions perform other functions. See 411 F.Supp. at 414-15 & n. 5. Some of these other functions are beyond the pale of the four exceptions specified in § 78ccc(a)(2). It is critical to note, however, that none of the other functions performed by MFS require broker-dealer registration. In essence MFS contends that its only activity as a broker or dealer is one which is specifically exempted by § 78ccc(a)(2) and that the other activities conducted by the firm in a non-broker-dealer capacity are irrelevant to the question of its membership vel non in SIPC.

SIPC for its part does not deny that the exclusive activity of the Sales Division is the distribution of the shares of the firm’s mutual fund customers. It argues, however, that once MFS registered as a broker-dealer (as it was required to do by the 1934 Act so that the Sales Division could conduct its business), it became a member of SIPC by virtue of its other activities which are not included among the specific statutory' exceptions and therefore can be assessed, pro tanto, for those nonexeepted activities. To use the term employed by SIPC in its brief, MFS’s registration as a broker-dealer conferred upon it the status of “member” in SIPC, see § 78ccc(a)(2)(A), and it can divest itself of that status only to the extent that it is involved in one or more of the four exempted activities (which SIPC characterizes as categories of exempt revenue).

For SIPC to prevail, however, it must overcome the significant hurdle that the plain language of the statute specifically exempts “persons whose business as a broker or dealer consists exclusively of . the distribution of [mutual fund] shares.” SIPC vigorously argues that the quoted phrase should not be given a technical meaning, but should be understood as exempting only those parties whose securities *756business (in the broad sense) consists exclusively of one or more of the exempted activities. MFS argues that the expression “as a broker or dealer” means precisely what it says and that since the only activity which it conducts pursuant to its broker-dealer registration is unquestionably exempted, it therefore is not a member of SIPC.

A basic principle which must guide our approach to the instant case is that a statute’s plain language is the primary indicator of its meaning:

“It is elementary that the meaning of a statute must, in the first instance, be sought in the language in which the act is framed, and if that is plain, and if the law is within the constitutional authority of the law-making body which passed it, the sole function of the courts is to enforce it according to its terms. Caminetti v. United States, 242 U.S. 470, 485, 37 S.Ct. 192, 194, 61 L.Ed. 442 (1917).

See also Flora v. United States, 357 U.S. 63, 65, 78 S.Ct. 1079, 2 L.Ed.2d 1165 (1968); United States v. Second National Bank, 502 F.2d 535, 539-40 (5th Cir. 1974), cert. denied, 421 U.S. 912, 95 S.Ct. 1567, 43 L.Ed.2d 777 (1975); Busse v. Commissioner of Internal Revenue, 479 F.2d 1147, 1150-51 (7th Cir. 1973); United States v. New England Coal & Coke Co., 318 F.2d 138, 142-43 (1st Cir. 1963). Of course, deference to the plain meaning rule should not be unthinking or blind. We would go beyond the plain meaning of statutory language when adherence to it would produce an absurd result or “an unreasonable one ‘plainly at variance with the policy of the legislation as a whole.’ ” United States v. American Trucking Ass’ns, Inc., 310 U.S. 534, 543, 60 S.Ct. 1059, 1064, 84 L.Ed. 1345 (1940), quoting Ozawa v. United States, 260 U.S. 178, 194, 43 S.Ct. 65, 67 L.Ed. 199 (1922). See also Commissioner of Internal Revenue v. Brown, 380 U.S. 563, 571, 85 S.Ct. 1162, 14 L.Ed.2d 75 (1965); Organized Migrants in Community Action, Inc. v. Brennan, 172 U.S.App.D.C. 147, 520 F.2d 1161, 1166-67 (1975); Chappell & Co. v. Frankel, 367 F.2d 197, 202 (2d Cir. 1966) (en banc). See generally United States v. Second National Bank, supra at 540-41; H. Hart & A. Sacks, The Legal Process 1144-1417 (tentative ed. 1958).

In the present case, we believe not only that the language of § 78ccc(a)(2) is clear but also that it produces a result which is neither absurd, unreasonable, nor at variance with the policy of SIPA. While Congress could have chosen to be less generous with its exemptions in establishing SIPC’s assessment powers, the statute as enacted does contain the exemptions referred to above. And we cannot say that these exemptions as drafted are absurd or unreasonable on their face or as applied, nor that their presence in the act is necessarily incompatible with the overall scheme of SIPA. Accordingly, we agree with the district court that the words “whose business as a broker or dealer” are to be given their ordinary meaning. See Banks v. Chicago Grain Trimmers, 390 U.S. 459, 465, 88 S.Ct. 1140, 20 L.Ed.2d 30 (1968); United States v. Stewart, 311 U.S. 60, 63, 61 S.Ct. 102, 85 L.Ed. 40 (1940); Independent Meat Packers Ass’n v. Butz, 526 F.2d 228, 237 (8th Cir. 1975), cert. denied, 424 U.S. 966, 96 S.Ct. 1461, 47 L.Ed.2d 733 (1976); Andreozzi v. D’Antuono, 113 R.1.155, 158, 319 A.2d 16, 18 (1974).3 As a result of this reading of *757the statute, it is clear that MFS is exempted from membership in SIPC since it is conceded that all of MFS’s activity as a broker-dealer is statutorily exempted.

SIPC vigorously urges us to interpret § 78ccc(a)(2) in the light of the legislative history of SIPA, which history SIPC views as supportive of its thesis that the “business as a broker or dealer” language in the statute does not have its ordinary meaning but rather means “securities business” in a general sense. Such use of the legislative history would, however, be contrary to the well-established rule that a court “will resort to the legislative history and other aids of statutory construction only when the literal words of the statute create ambiguity or lead to an unreasonable interpretation.” Araya v. McLelland, 525 F.2d 1194, 1195-96 (5th Cir. 1976). See also United States v. Oregon, 366 U.S. 643, 648, 81 S.Ct. 1278, 6 L.Ed.2d 575 (1961); I. T. T. v. G. T. E., 518 F.2d 913, 917-21 (9th Cir. 1975); Portland Cement Ass’n v. Ruckelshaus, 186 U.S.App.D.C. 308, 486 F.2d 375, 379-80 & n. 13 (1973), cert. denied, 417 U.S. 921, 94 S.Ct. 2628, 41 L.Ed.2d 226 (1974). Since we are satisfied that § 78ccc(a)(2), whether read in isolation or in context, is neither ambiguous nor productive of an unreasonable result, we do not feel required, to look to the legislative history for illumination.

We have, nevertheless, read through the legislative history of SIPA with care,4 and we concede that some portions of the history are at least arguably favorable to SIPC’s argument that Congress did not wish to grant broad exemptions because it wanted SIPC to be able to raise a great deal of revenue early in its existence. We stress, however, that the legislative history is by no means unequivocal in this sense,5 but rather is polyvalent and reflective of a multitude of views.6 When we compare this less than clear legislative history 7 with the straight-forward language of the statute, we are confirmed in our conviction that we should adhere to the latter and interpret it in its usual sense. See Greenwood v. United States, 350 U.S. 366, 374, 76 S.Ct. 410, 100 L.Ed. 412 (1956); Gemsco, Inc. v. Walling, 324 U.S. 244, 260, 65 S.Ct. 605, 89 L.Ed. 921 (1945).

It is not our province to decide whether Congress would have been wiser to draft *758the SIPO legislation so as to include firms like MFS as members, Old Dearborn Distributing Co. v. Seagram-Distillers Corp., 299 U.S. 183, 195-96, 57 S.Ct. 139, 81 L.Ed. 109 (1936), and it is no part of our function to extend a statute’s reach beyond its clearly indicated scope. Guiseppi v. Walling, 144 F.2d 608, 614-15 (2d Cir. 1944) (Frank, J.) aff’d sub nom. Gemsco, Inc. v. Walling, 324 U.S. 244, 65 S.Ct. 605, 89 L.Ed. 921 (1945). Rather, “[i]t is our judicial function to apply statutes on the basis of what Congress has written, not what Congress might have written.” United States v. Great Northern Ry., 343 U.S. 562, 575, 72 S.Ct. 985, 993, 96 L.Ed. 1142 (1952). Congress remains free to amend SIPA should it so choose, but as it now stands that act clearly exempts MFS.

Affirmed.